.editorconfig

@@ -1,16 +1,13 @@
 # editorconfig.org
-root = true
 
 [*]
-end_of_line = lf
 charset = utf-8
-trim_trailing_whitespace = true
-insert_final_newline = true
 indent_style = space
 indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
 
 [*.md]
+insert_final_newline = true
 trim_trailing_whitespace = false
-
-[Makefile]
-indent_style = tab

.eslintignore

@@ -1,4 +1,5 @@
-node_modules
-
-test/fixtures/
-test/output/
+/coverage
+/dist
+/node_modules
+/test/fixtures
+/test/output

.eslintrc.js

@@ -0,0 +1,8 @@
+module.exports = {
+  root: true,
+  extends: ['@webpack-contrib/eslint-config-webpack', 'prettier'],
+  rules: {
+    'global-require': 'off',
+    'import/no-dynamic-require': 'off',
+  },
+};

.gitattributes

@@ -0,0 +1,4 @@
+* text=auto
+bin/* eol=lf
+package-lock.json -diff
+yarn.lock -diff

.github/CODEOWNERS

@@ -0,0 +1,6 @@
+# These are the default owners for everything in
+# webpack-contrib
+@webpack-contrib/org-maintainers
+
+# Add repository specific users / groups
+# below here for libs that are not maintained by the org.

.github/CONTRIBUTING.md

@@ -0,0 +1,160 @@
+# Contributing in @webpack-contrib
+
+We'd always love contributions to further improve the webpack / webpack-contrib ecosystem!
+Here are the guidelines we'd like you to follow:
+
+- [Questions and Problems](#question)
+- [Issues and Bugs](#issue)
+- [Feature Requests](#feature)
+- [Pull Request Submission Guidelines](#submit-pr)
+- [Commit Message Conventions](#commit)
+
+## <a name="question"></a> Got a Question or Problem?
+
+Please submit support requests and questions to StackOverflow using the tag [[webpack]](http://stackoverflow.com/tags/webpack).
+StackOverflow is better suited for this kind of support though you may also inquire in [Webpack Gitter](https://gitter.im/webpack/webpack).
+The issue tracker is for bug reports and feature discussions.
+
+## <a name="issue"></a> Found an Issue or Bug?
+
+Before you submit an issue, please search the issue tracker, maybe an issue for your problem already exists and the discussion might inform you of workarounds readily available.
+
+We want to fix all the issues as soon as possible, but before fixing a bug we need to reproduce and confirm it. In order to reproduce bugs, we ask that you to provide a minimal reproduction scenario (github repo or failing test case). Having a live, reproducible scenario gives us a wealth of important information without going back & forth to you with additional questions like:
+
+- version of Webpack used
+- version of the loader / plugin you are creating a bug report for
+- the use-case that fails
+
+A minimal reproduce scenario allows us to quickly confirm a bug (or point out config problems) as well as confirm that we are fixing the right problem.
+
+We will be insisting on a minimal reproduce scenario in order to save maintainers time and ultimately be able to fix more bugs. We understand that sometimes it might be hard to extract essentials bits of code from a larger code-base but we really need to isolate the problem before we can fix it.
+
+Unfortunately, we are not able to investigate / fix bugs without a minimal reproduction, so if we don't hear back from you we are going to close an issue that doesn't have enough info to be reproduced.
+
+## <a name="feature"></a> Feature Requests?
+
+You can _request_ a new feature by creating an issue on Github.
+
+If you would like to _implement_ a new feature, please submit an issue with a proposal for your work `first`, to be sure that particular makes sense for the project.
+
+## <a name="submit-pr"></a> Pull Request Submission Guidelines
+
+Before you submit your Pull Request (PR) consider the following guidelines:
+
+- Search Github for an open or closed PR that relates to your submission. You don't want to duplicate effort.
+- Commit your changes using a descriptive commit message that follows our [commit message conventions](#commit). Adherence to these conventions is necessary because release notes are automatically generated from these messages.
+- Fill out our `Pull Request Template`. Your pull request will not be considered if it is ignored.
+- Please sign the `Contributor License Agreement (CLA)` when a pull request is opened. We cannot accept your pull request without this. Make sure you sign with the primary email address associated with your local / github account.
+
+## <a name="commit"></a> Webpack Contrib Commit Conventions
+
+Each commit message consists of a **header**, a **body** and a **footer**. The header has a special
+format that includes a **type**, a **scope** and a **subject**:
+
+```
+<type>(<scope>): <subject>
+<BLANK LINE>
+<body>
+<BLANK LINE>
+<footer>
+```
+
+The **header** is mandatory and the **scope** of the header is optional.
+
+Any line of the commit message cannot be longer 100 characters! This allows the message to be easier
+to read on GitHub as well as in various git tools.
+
+The footer should contain a [closing reference to an issue](https://help.github.com/articles/closing-issues-via-commit-messages/) if any.
+
+Examples:
+
+```
+docs(readme): update install instructions
+```
+
+```
+fix: refer to the `entrypoint` instead of the first `module`
+```
+
+### Revert
+
+If the commit reverts a previous commit, it should begin with `revert:`, followed by the header of the reverted commit.
+In the body it should say: `This reverts commit <hash>.`, where the hash is the SHA of the commit being reverted.
+
+### Type
+
+Must be one of the following:
+
+- **build**: Changes that affect the build system or external dependencies (example scopes: babel, npm)
+- **chore**: Changes that fall outside of build / docs that do not effect source code (example scopes: package, defaults)
+- **ci**: Changes to our CI configuration files and scripts (example scopes: circleci, travis)
+- **docs**: Documentation only changes (example scopes: readme, changelog)
+- **feat**: A new feature
+- **fix**: A bug fix
+- **perf**: A code change that improves performance
+- **refactor**: A code change that neither fixes a bug nor adds a feature
+- **revert**: Used when reverting a committed change
+- **style**: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons)
+- **test**: Addition of or updates to Jest tests
+
+### Scope
+
+The scope is subjective & depends on the `type` see above. A good example would be a change to a particular class / module.
+
+### Subject
+
+The subject contains a succinct description of the change:
+
+- use the imperative, present tense: "change" not "changed" nor "changes"
+- don't capitalize the first letter
+- no dot (.) at the end
+
+### Body
+
+Just as in the **subject**, use the imperative, present tense: "change" not "changed" nor "changes".
+The body should include the motivation for the change and contrast this with previous behavior.
+
+### Footer
+
+The footer should contain any information about **Breaking Changes** and is also the place to
+reference GitHub issues that this commit **Closes**.
+
+**Breaking Changes** should start with the word `BREAKING CHANGE:` with a space or two newlines. The rest of the commit message is then used for this.
+
+Example
+
+```
+BREAKING CHANGE: Updates to `Chunk.mapModules`.
+
+This release is not backwards compatible with `Webpack 2.x` due to breaking changes in webpack/webpack#4764
+Migration: see webpack/webpack#5225
+
+```
+
+## Testing Your Pull Request
+
+You may have the need to test your changes in a real-world project or dependent
+module. Thankfully, Github provides a means to do this. Add a dependency to the
+`package.json` for such a project as follows:
+
+```json
+{
+  "devDependencies": {
+    "eslint-loader": "webpack-contrib/eslint-loader#{id}/head"
+  }
+}
+```
+
+Where `{id}` is the # ID of your Pull Request.
+
+## Contributor License Agreement
+
+When submitting your contribution, a CLA (Contributor License Agreement) bot will come by to verify that you signed the [CLA](https://cla.js.foundation/webpack-contrib/eslint-loader).
+If it is your first time, it will link you to the right place to sign it.
+However, if you have committed your contributions using an email that is not the same as your email used on GitHub, the CLA bot can't accept your contribution.
+
+Run `git config user.email` to see your Git email, and verify it with [your GitHub email](https://github.com/settings/emails).
+
+## Thanks
+
+For your interest, time, understanding, and for following this simple guide.

.github/FUNDING.yml

@@ -0,0 +1 @@
+open_collective: webpack

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,16 @@
+<!--
+  👉🏽 Need support, advice, or help? Don't open an issue!
+  Head to StackOverflow or https://gitter.im/webpack/webpack.
+
+  Hey there!
+
+  You arrived at this template because you felt none of the other options
+  matched the kind of issue you'd like to report. Please use this opportunity to
+  tell us about your particular type of issue so we can try to accomodate
+  similar issues in the future.
+
+  PLEASE do note, if you're using this to report an issue already covered by the
+  existing template types, your issue may be closed as invalid. Our issue
+  templates contain fields that help us help you, and without that important
+  info, we might as well be ice-skating uphill, carrying a wooly mammoth.
+-->

.github/ISSUE_TEMPLATE/BUG.md

@@ -0,0 +1,50 @@
+---
+name: 🐛 Bug Report
+about: Something went awry and you'd like to tell us about it.
+---
+
+<!--
+  Issues are so 🔥
+
+  If you remove or skip this template, you'll make the 🐼 sad and the mighty god
+  of Github will appear and pile-drive the close button from a great height
+  while making animal noises.
+
+  👉🏽 Need support, advice, or help? Don't open an issue!
+  Head to StackOverflow or https://gitter.im/webpack/webpack.
+-->
+
+- Operating System:
+- Node Version:
+- NPM Version:
+- webpack Version:
+- eslint-loader Version:
+
+### Expected Behavior
+
+<!-- Remove this section if not reporting a bug or modification request. -->
+
+### Actual Behavior
+
+<!-- Remove this section if not reporting a bug or modification request. -->
+
+### Code
+
+```js
+// webpack.config.js
+// If your code blocks are over 20 lines, please paste a link to a gist
+// (https://gist.github.com).
+```
+
+```js
+// additional code, HEY YO remove this block if you don't need it
+```
+
+### How Do We Reproduce?
+
+<!--
+  Remove this section if not reporting a bug.
+
+  If your webpack config is over 50 lines long, please provide a URL to a repo
+  for your beefy 🍖 app that we can use to reproduce.
+-->

.github/ISSUE_TEMPLATE/DOCS.md

@@ -0,0 +1,28 @@
+---
+name: 📚 Documentation
+about: Are the docs lacking or missing something? Do they need some new 🔥 hotness? Tell us here.
+---
+
+<!--
+  Issues are so 🔥
+
+  If you remove or skip this template, you'll make the 🐼 sad and the mighty god
+  of Github will appear and pile-drive the close button from a great height
+  while making animal noises.
+
+  👉🏽 Need support, advice, or help? Don't open an issue!
+  Head to StackOverflow or https://gitter.im/webpack/webpack.
+-->
+
+Documentation Is:
+
+<!-- Please place an x (no spaces!) in all [ ] that apply -->
+
+- [ ] Missing
+- [ ] Needed
+- [ ] Confusing
+- [ ] Not Sure?
+
+### Please Explain in Detail...
+
+### Your Proposal for Changes

.github/ISSUE_TEMPLATE/FEATURE.md

@@ -0,0 +1,25 @@
+---
+name: ✨ Feature Request
+about: Suggest an idea for this project
+---
+
+<!--
+  Issues are so 🔥
+
+  If you remove or skip this template, you'll make the 🐼 sad and the mighty god
+  of Github will appear and pile-drive the close button from a great height
+  while making animal noises.
+
+  👉🏽 Need support, advice, or help? Don't open an issue!
+  Head to StackOverflow or https://gitter.im/webpack/webpack.
+-->
+
+- Operating System:
+- Node Version:
+- NPM Version:
+- webpack Version:
+- eslint-loader Version:
+
+### Feature Proposal
+
+### Feature Use Case

.github/ISSUE_TEMPLATE/MODIFICATION.md

@@ -0,0 +1,27 @@
+---
+name: 🔧 Modification Request
+about: Would you like something work differently? Have an alternative approach? This is the template for you.
+---
+
+<!--
+  Issues are so 🔥
+
+  If you remove or skip this template, you'll make the 🐼 sad and the mighty god
+  of Github will appear and pile-drive the close button from a great height
+  while making animal noises.
+
+  👉🏽 Need support, advice, or help? Don't open an issue!
+  Head to StackOverflow or https://gitter.im/webpack/webpack.
+-->
+
+- Operating System:
+- Node Version:
+- NPM Version:
+- webpack Version:
+- eslint-loader Version:
+
+### Expected Behavior / Situation
+
+### Actual Behavior / Situation
+
+### Modification Proposal

.github/ISSUE_TEMPLATE/SUPPORT.md

@@ -0,0 +1,8 @@
+---
+name: 🆘 Support, Help, and Advice
+about: 👉🏽 Need support, help, or advice? Don't open an issue! Head to StackOverflow or https://gitter.im/webpack/webpack.
+---
+
+Hey there! If you need support, help, or advice then this is not the place to ask.
+Please visit [StackOverflow](https://stackoverflow.com/questions/tagged/webpack)
+or [the Webpack Gitter](https://gitter.im/webpack/webpack) instead.

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,35 @@
+<!--
+  HOLY CRAP a Pull Request. We ❤️ those!
+
+  If you remove or skip this template, you'll make the 🐼 sad and the mighty god
+  of Github will appear and pile-drive the close button from a great height
+  while making animal noises.
+
+  Please place an x (no spaces!) in all [ ] that apply
+-->
+
+This PR contains a:
+
+- [ ] **bugfix**
+- [ ] new **feature**
+- [ ] **code refactor**
+- [ ] **test update** <!-- if bug or feature is checked, this should be too -->
+- [ ] **typo fix**
+- [ ] **metadata update**
+
+### Motivation / Use-Case
+
+<!--
+  Please explain the motivation or use-case for your change.
+  What existing problem does the PR solve?
+  If this PR addresses an issue, please link to the issue.
+-->
+
+### Breaking Changes
+
+<!--
+  If this PR introduces a breaking change, please describe the impact and a
+  migration path for existing applications.
+-->
+
+### Additional Info

.gitignore

@@ -1,3 +1,20 @@
-node_modules
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+.eslintcache
 
-test/output/
+/coverage
+/dist
+/local
+/reports
+/node_modules
+/test/output
+
+.DS_Store
+Thumbs.db
+.idea
+.vscode
+*.sublime-project
+*.sublime-workspace
+*.iml

.prettierignore

@@ -0,0 +1,6 @@
+/coverage
+/dist
+/node_modules
+/test/fixtures
+/test/output
+CHANGELOG.md

.prettierrc.js

@@ -0,0 +1,5 @@
+module.exports = {
+  singleQuote: true,
+  trailingComma: 'es5',
+  arrowParens: 'always',
+};

CHANGELOG.md

@@ -1,38 +1,190 @@
+# Changelog
+
+All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
+
+### [4.0.2](https://github.com/webpack-contrib/eslint-loader/compare/v3.0.4...v4.0.2) (2020-04-24)
+
+
+### Bug Fixes
+
+* use fs-extra ^8.1.0 ([7febae0](https://github.com/webpack-contrib/eslint-loader/commit/7febae056ac6271c4cf76b8e387f8fae5800a879))
+
+### [4.0.1](https://github.com/webpack-contrib/eslint-loader/compare/v3.0.4...v4.0.1) (2020-04-24)
+
+### Refactor
+
+* new cache implementation ([#320](https://github.com/webpack-contrib/eslint-loader/pull/320)) ([6bb1fa6](https://github.com/webpack-contrib/eslint-loader/commit/acae2be88678228e6589b40122a93f88437b8e47))
+
+## [4.0.0](https://github.com/webpack-contrib/eslint-loader/compare/v3.0.4...v4.0.0) (2020-04-03)
+
+### Breaking Changes
+
+* drop support for Node < 10.13.0
+* minimum supported eslint version is 6
+
+### [3.0.4](https://github.com/webpack-contrib/eslint-loader/compare/v3.0.3...v3.0.4) (2020-04-02)
+
+
+### Bug Fixes
+
+* [#316](https://github.com/webpack-contrib/eslint-loader/issues/316) updating loader-fs-cache min version ([#317](https://github.com/webpack-contrib/eslint-loader/issues/317)) ([796e3d1](https://github.com/webpack-contrib/eslint-loader/commit/796e3d130a030ce48e14ee3421809ca40d25cde1))
+
+### [3.0.3](https://github.com/webpack-contrib/eslint-loader/compare/v3.0.2...v3.0.3) (2019-12-06)
+
+
+### Bug Fixes
+
+* check result object ([#311](https://github.com/webpack-contrib/eslint-loader/issues/311)) ([6bb1fa6](https://github.com/webpack-contrib/eslint-loader/commit/6bb1fa68d043f00de63cda4d9babd3a2c9a50d58))
+* support webpack 5 ([#312](https://github.com/webpack-contrib/eslint-loader/issues/312)) ([c0a9d0c](https://github.com/webpack-contrib/eslint-loader/commit/c0a9d0c118155c56c41dc344460f333a9e969eaf))
+
+### [3.0.2](https://github.com/webpack-contrib/eslint-loader/compare/v3.0.1...v3.0.2) (2019-09-27)
+
+
+### Bug Fixes
+
+* check if contain results ([#300](https://github.com/webpack-contrib/eslint-loader/issues/300)) ([7d1d1fe](https://github.com/webpack-contrib/eslint-loader/commit/7d1d1fe))
+* ensure output file path ([#299](https://github.com/webpack-contrib/eslint-loader/issues/299)) ([16e9ccf](https://github.com/webpack-contrib/eslint-loader/commit/16e9ccf))
+
+### [3.0.1](https://github.com/webpack-contrib/eslint-loader/compare/v3.0.0...v3.0.1) (2019-09-25)
+
+
+### Bug Fixes
+
+* module build failed error at Linter.parseResults ([#294](https://github.com/webpack-contrib/eslint-loader/issues/294)) ([360e69c](https://github.com/webpack-contrib/eslint-loader/commit/360e69c))
+
+### [3.0.0](https://github.com/webpack-contrib/eslint-loader/compare/v2.2.1...v3.0.0) (2019-08-24)
+
+
+### Bugfix
+
+* fix corrupted filenames if cwd == "/"
+* cannot use string formatter in outputReport
+* no Output Report in File when build fails under webpack 4
+* add posibility to use absolute file path in outputReport.filePath
+* it should be possible to use absolute file path in outputReport.filePath
+* try load official formatter ([#285](https://github.com/webpack-contrib/eslint-loader/issues/285)) ([997cce5](https://github.com/webpack-contrib/eslint-loader/commit/997cce5))
+* emit warning/error if no config was found/given ([#286](https://github.com/webpack-contrib/eslint-loader/issues/286)) ([4204560](https://github.com/webpack-contrib/eslint-loader/commit/4204560))
+
+
+### Features
+
+* validate schema options
+
+
+### Breaking Changes
+
+* drop support for Node < 8.9.0
+* minimum supported webpack version is 4
+* minimum supported eslint version is 5
+
+
+
+# 2.2.1 - 2019-07-04
+
+- Fixed: path to eslint version for cache
+  ([#282](https://github.com/webpack-contrib/eslint-loader/issues/282) - @ricardogobbosouza)
+
+# 2.2.0 - 2019-07-03
+
+- [Add ESLint 6 support](https://github.com/webpack-contrib/eslint-loader/commit/b6c3938aae61c0390ac8d941af50cf36df14cfc3) by @HDuck
+
+# 2.1.2 - 2019-01-31
+
+- [Fix autofix for eslint < 5](https://github.com/webpack-contrib/eslint-loader/commit/d76372676b8badf57df3d6a22be5739d19e25637) by @eschablowski
+
+# 2.1.1 - 2018-09-19
+
+- [Stop autofixing infinite loop](https://github.com/webpack-contrib/eslint-loader/commit/704024864f737a487ec0b9f9c9b00b11881f2558) by @eschablowski
+- [Allow `formatter` to receive string (path) to file exporting formatter function](https://github.com/webpack-contrib/eslint-loader/commit/7108379e2864f6ffb75cde1d147ee1fe86890ba8) by @Timer
+
+# 2.1.0 - 2018-07-19
+
+- [Add ESLint 5 support](https://github.com/webpack-contrib/eslint-loader/commit/1dc9442d9e2344b953ac88c5c416dcb79f3c690d) by @Alex-Sokolov
+- [Fix not returning execution flow control to webpack when cache option is enabled and one of the files has a linting error](https://github.com/webpack-contrib/eslint-loader/commit/97761d724e6fa26d8dbde4a544ddb7cb3795f568) by @nicolaslt
+- dev deps updates, prettier, eslint config [...](https://github.com/webpack-contrib/eslint-loader/compare/2.0.0...2.1.0)
+
+# 2.0.0 - 2018-02-26
+
+- 🚨 Drop webpack@1.x support (by @wonism in [#212](https://github.com/webpack-contrib/eslint-loader/pull/212))
+- 🚨 Drop Node 4 supported (by @wonism in [#212](https://github.com/webpack-contrib/eslint-loader/pull/212))
+- ✨ Add webpack@4.x support (by @wonism in [#212](https://github.com/webpack-contrib/eslint-loader/pull/212))
+- 🐛 Respect `eslintPath` for formatter (by @lmnsg in [#195](https://github.com/webpack-contrib/eslint-loader/pull/195))
+
+# 1.9.0 - 2017-07-06
+
+- Added: `eslintPath` option so you can provide your own eslint path.
+  ([#183](https://github.com/webpack-contrib/eslint-loader/pull/183) - @trungdq88)
+
+# 1.8.0 - 2017-06-15
+
+- Added: support for eslint@^4.0.0
+  ([#178](https://github.com/webpack-contrib/eslint-loader/issues/178) - @Aladdin-ADD)
+
+# 1.7.1 - 2017-03-31
+
+- Fixed: Remove duplicate output with webpack 2
+  ([#169](https://github.com/webpack-contrib/eslint-loader/pull/169) - @jaridmargolin)
+
+# 1.7.0 - 2017-03-23
+
+- Fixed: outputReport option writes report for last file checked only
+  ([#160](https://github.com/webpack-contrib/eslint-loader/pull/160) - @deryni)
+- Added: use babel loader fs cache as the default caching engine
+  ([#159](https://github.com/webpack-contrib/eslint-loader/pull/159) - @viankakrisna)
+
+# 1.6.3 - 2017-02-22
+
+- Fixed: ignore cache when eslint rules have changed
+  ([#151](https://github.com/webpack-contrib/eslint-loader/pull/151) - @wrakky)
+
+# 1.6.2 - 2017-02-22
+
+- Fixed: fallback to OS temp directory if findCacheDir fails
+  ([#154](https://github.com/webpack-contrib/eslint-loader/pull/154) - @viankakrisna)
+- Fixed: `loader-utils` deprecation warning by upgrading to v1.0.0
+  ([#155](https://github.com/webpack-contrib/eslint-loader/pull/155) - @fknussel)
+
+# 1.6.1 - 2016-11-02
+
+- Fixed: multiples config per instance are now supported
+  ([#105](https://github.com/webpack-contrib/eslint-loader/issues/105) -
+  @jaythomas and @jameslnewell)
+
 # 1.6.0 - 2016-10-17
 
 - Added: Option to generate report file
-  ([#118](https://github.com/MoOx/eslint-loader/pull/118) - @vidhill)
+  ([#118](https://github.com/webpack-contrib/eslint-loader/pull/118) - @vidhill)
 
 # 1.5.0 - 2016-07-28
 
 - Added: `cache` options
-  ([#93](https://github.com/MoOx/eslint-loader/pull/93) - @genintho)
+  ([#93](https://github.com/webpack-contrib/eslint-loader/pull/93) - @genintho)
 
 # 1.4.1 - 2016-06-07
 
 - Fixed: .eslintignore is not ignored anymore (eslint 3.x regression)
-  ([#99](https://github.com/MoOx/eslint-loader/pull/99) - @waiterZen)
+  ([#99](https://github.com/webpack-contrib/eslint-loader/pull/99) - @waiterZen)
 
 # 1.4.0 - 2016-06-02
 
 - Added: support for eslint@^3.0.0
-([#96](https://github.com/MoOx/eslint-loader/issues/96))
+  ([#96](https://github.com/webpack-contrib/eslint-loader/issues/96))
 
 # 1.3.0 - 2016-02-17
 
 - Added: support for eslint@^2.0.0
-([#81](https://github.com/MoOx/eslint-loader/pull/81))
+  ([#81](https://github.com/webpack-contrib/eslint-loader/pull/81))
 
 # 1.2.1 - 2016-01-26
 
 - Updated: object-assign dependency
-([#77](https://github.com/MoOx/eslint-loader/pull/77))
+  ([#77](https://github.com/webpack-contrib/eslint-loader/pull/77))
 
 # 1.2.0 - 2016-01-02
 
 - Added: this loader now pass down the input source map to the next chained
-loader if it exists
-([#70](https://github.com/MoOx/eslint-loader/pull/70)).
+  loader if it exists
+  ([#70](https://github.com/webpack-contrib/eslint-loader/pull/70)).
 
 # 1.1.1 - 2015-10-08
 
@@ -45,7 +197,7 @@ loader if it exists
 # 1.0.0 - 2015-08-08
 
 - Added: support for eslint 1.x
-- Removed: support for eslint 1.x-rc*
+- Removed: support for eslint 1.x-rc\*
 - Removed: support for eslint 0.x
 
 # 0.14.2 - 2015-07-18
@@ -63,13 +215,13 @@ loader if it exists
 # 0.13.0 - 2015-06-14
 
 - Changed: a file that should be ignored doesn't trigger a warning
-([#44](https://github.com/MoOx/eslint-loader/issues/44))
+  ([#44](https://github.com/webpack-contrib/eslint-loader/issues/44))
 
 # 0.12.0 - 2015-06-04
 
 - Changed: upgrade to eslint 0.22.x
 - Fixed: respect .eslintrc/eslintignore files in directory tree
-([#21](https://github.com/MoOx/eslint-loader/issues/21))
+  ([#21](https://github.com/webpack-contrib/eslint-loader/issues/21))
 
 # 0.11.2 - 2015-05-11
 
@@ -106,23 +258,22 @@ loader if it exists
 # 0.6.0 - 2015-03-11
 
 - Changed: `reporter` now automatically drop lines that contains the filename in
-the reporter output.
-That mean you can use official or community reporters without worrying to see
-lot of lines with `<text>` as filename :)
+  the reporter output.
+  That mean you can use official or community reporters without worrying to see
+  lot of lines with `<text>` as filename :)
 
 # 0.5.0 - 2015-03-11
 
 - Changed: upgrade to eslint 0.16.x
 - Changed: `emitErrors` is now `emitError`
 - Changed: loader now use `webpack.emitError` or `webpack.emitWarning`
-automatically (according to eslint configuration).
-You can still override by using `emitError` or `emitWarning` options to override
-this behavior
+  automatically (according to eslint configuration).
+  You can still override by using `emitError` or `emitWarning` options to override
+  this behavior
 - Added: `emitWarning` can force eslint to report warning instead of the default
-behavior (see above)
+  behavior (see above)
 - Added: `quiet` option to hide warnings
 
-
 # 0.4.0 - 2015-02-23
 
 - Changed: upgrade to eslint 0.15.x
@@ -141,7 +292,7 @@ behavior (see above)
 
 - Changed: upgrade to eslint 0.12.x
 - Added: enable loading of eslint config from webpack config, `.eslintrc`, or
-`package.json`
+  `package.json`
 
 # 0.1.0 - 2014-12-05
 

LICENSE

@@ -1,21 +1,20 @@
-The MIT License (MIT)
+Copyright JS Foundation and other contributors
 
-Copyright (c) 2015 Maxime Thirouin
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
 
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
 
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

azure-pipelines.yml

@@ -0,0 +1,200 @@
+trigger:
+  - master
+  - next
+
+variables:
+  npm_config_cache: $(Pipeline.Workspace)/.npm
+
+jobs:
+  - job: Lint
+    pool:
+      vmImage: ubuntu-latest
+    steps:
+      - task: NodeTool@0
+        inputs:
+          versionSpec: ^10.13.0
+        displayName: 'Install Node.js'
+      - task: Npm@1
+        inputs:
+          command: custom
+          customCommand: i -g npm@latest
+        displayName: 'Install latest NPM'
+      - script: |
+          node -v
+          npm -v
+        displayName: 'Print versions'
+      - task: CacheBeta@1
+        inputs:
+          key: npm | $(Agent.OS) | package-lock.json
+          path: $(npm_config_cache)
+        displayName: 'Cache npm'
+      - script: npm ci
+        displayName: 'Install dependencies'
+      - script: npm run lint
+        displayName: 'Run lint'
+      - script: npm run security
+        displayName: 'Run NPM audit'
+      - script: ./node_modules/.bin/commitlint-azure-pipelines
+        displayName: 'Run lint commit message'
+
+  - job: Linux
+    pool:
+      vmImage: ubuntu-latest
+    strategy:
+      maxParallel: 4
+      matrix:
+        node-13:
+          node_version: ^13.0.0
+          webpack_version: latest
+        node-12:
+          node_version: ^12.0.0
+          webpack_version: latest
+        node-10:
+          node_version: ^10.13.0
+          webpack_version: latest
+        node-10-canary:
+          node_version: ^10.13.0
+          webpack_version: next
+    steps:
+      - task: NodeTool@0
+        inputs:
+          versionSpec: $(node_version)
+        displayName: 'Install Node.js $(node_version)'
+      - task: Npm@1
+        inputs:
+          command: custom
+          customCommand: i -g npm@latest
+        displayName: 'Install latest NPM'
+      - script: |
+          node -v
+          npm -v
+        displayName: 'Print versions'
+      - task: CacheBeta@1
+        inputs:
+          key: npm | $(Agent.OS) | package-lock.json
+          path: $(npm_config_cache)
+        displayName: 'Cache npm'
+      - script: npm ci
+        displayName: 'Install dependencies'
+      - script: npm i webpack@$(webpack_version)
+        displayName: 'Install "webpack@$(webpack_version)"'
+      - script: npm run test:coverage -- --ci --reporters="default" --reporters="jest-junit" || $(continue_on_error)
+        displayName: 'Run tests with coverage'
+      - task: PublishTestResults@2
+        inputs:
+          testRunTitle: 'Linux with Node.js $(node_version)'
+          testResultsFiles: '**/junit.xml'
+        condition: succeededOrFailed()
+        displayName: 'Publish test results'
+      - script: curl -s https://codecov.io/bash | bash -s -- -t $(CODECOV_TOKEN)
+        condition: succeededOrFailed()
+        displayName: 'Submit coverage data to codecov'
+
+  - job: macOS
+    pool:
+      vmImage: macOS-latest
+    strategy:
+      maxParallel: 4
+      matrix:
+        node-13:
+          node_version: ^13.0.0
+          webpack_version: latest
+        node-12:
+          node_version: ^12.0.0
+          webpack_version: latest
+        node-10:
+          node_version: ^10.13.0
+          webpack_version: latest
+        node-10-canary:
+          node_version: ^10.13.0
+          webpack_version: next
+    steps:
+      - task: NodeTool@0
+        inputs:
+          versionSpec: $(node_version)
+        displayName: 'Install Node.js $(node_version)'
+      - task: Npm@1
+        inputs:
+          command: custom
+          customCommand: i -g npm@latest
+        displayName: 'Install latest NPM'
+      - script: |
+          node -v
+          npm -v
+        displayName: 'Print versions'
+      - task: CacheBeta@1
+        inputs:
+          key: npm | $(Agent.OS) | package-lock.json
+          path: $(npm_config_cache)
+        displayName: 'Cache npm'
+      - script: npm ci
+        displayName: 'Install dependencies'
+      - script: npm i webpack@$(webpack_version)
+        displayName: 'Install "webpack@$(webpack_version)"'
+      - script: npm run test:coverage -- --ci --reporters="default" --reporters="jest-junit" || $(continue_on_error)
+        displayName: 'Run tests with coverage'
+      - task: PublishTestResults@2
+        inputs:
+          testRunTitle: 'Linux with Node.js $(node_version)'
+          testResultsFiles: '**/junit.xml'
+        condition: succeededOrFailed()
+        displayName: 'Publish test results'
+      - script: curl -s https://codecov.io/bash | bash -s -- -t $(CODECOV_TOKEN)
+        condition: succeededOrFailed()
+        displayName: 'Submit coverage data to codecov'
+
+  - job: Windows
+    pool:
+      vmImage: windows-latest
+    strategy:
+      maxParallel: 4
+      matrix:
+        node-13:
+          node_version: ^13.0.0
+          webpack_version: latest
+        node-12:
+          node_version: ^12.0.0
+          webpack_version: latest
+        node-10:
+          node_version: ^10.13.0
+          webpack_version: latest
+        node-10-canary:
+          node_version: ^10.13.0
+          webpack_version: next
+    steps:
+      - script: 'git config --global core.autocrlf input'
+        displayName: 'Config git core.autocrlf'
+      - checkout: self
+      - task: NodeTool@0
+        inputs:
+          versionSpec: $(node_version)
+        displayName: 'Install Node.js $(node_version)'
+      - task: Npm@1
+        inputs:
+          command: custom
+          customCommand: i -g npm@latest
+        displayName: 'Install latest NPM'
+      - script: |
+          node -v
+          npm -v
+        displayName: 'Print versions'
+      - task: CacheBeta@1
+        inputs:
+          key: npm | $(Agent.OS) | package-lock.json
+          path: $(npm_config_cache)
+        displayName: 'Cache npm'
+      - script: npm ci
+        displayName: 'Install dependencies'
+      - script: npm i webpack@$(webpack_version)
+        displayName: 'Install "webpack@$(webpack_version)"'
+      - script: npm run test:coverage -- --ci --reporters="default" --reporters="jest-junit" || $(continue_on_error)
+        displayName: 'Run tests with coverage'
+      - task: PublishTestResults@2
+        inputs:
+          testRunTitle: 'Linux with Node.js $(node_version)'
+          testResultsFiles: '**/junit.xml'
+        condition: succeededOrFailed()
+        displayName: 'Publish test results'
+      - script: curl -s https://codecov.io/bash | bash -s -- -t $(CODECOV_TOKEN)
+        condition: succeededOrFailed()
+        displayName: 'Submit coverage data to codecov'

babel.config.js

@@ -0,0 +1,19 @@
+const MIN_BABEL_VERSION = 7;
+
+module.exports = (api) => {
+  api.assertVersion(MIN_BABEL_VERSION);
+  api.cache(true);
+
+  return {
+    presets: [
+      [
+        '@babel/preset-env',
+        {
+          targets: {
+            node: '10.13.0',
+          },
+        },
+      ],
+    ],
+  };
+};

commitlint.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  extends: ['@commitlint/config-conventional'],
+};

husky.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  hooks: {
+    'pre-commit': 'lint-staged',
+    'commit-msg': 'commitlint -E HUSKY_GIT_PARAMS',
+  },
+};

jest.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+  testEnvironment: 'node',
+  testTimeout: 30000,
+};

lint-staged.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+  '*.js': ['prettier --write', 'eslint --fix', 'git add'],
+  '*.{json,md,yml,css}': ['prettier --write', 'git add'],
+};

package.json

@@ -1,39 +1,85 @@
 {
   "name": "eslint-loader",
-  "version": "1.6.0",
-  "description": "eslint loader (for webpack)",
-  "keywords": [
-    "lint",
-    "linter",
-    "eslint",
-    "loader",
-    "webpack"
-  ],
-  "repository": "https://github.com/MoOx/eslint-loader.git",
-  "author": "Maxime Thirouin",
+  "version": "4.0.2",
+  "description": "A ESlint loader for webpack",
   "license": "MIT",
+  "repository": "webpack-contrib/eslint-loader",
+  "author": "Maxime Thirouin",
+  "contributors": [
+    "Ricardo Gobbo de Souza <ricardogobbosouza@yahoo.com.br>"
+  ],
+  "homepage": "https://github.com/webpack-contrib/eslint-loader",
+  "bugs": "https://github.com/webpack-contrib/eslint-loader/issues",
+  "main": "dist/cjs.js",
+  "engines": {
+    "node": ">= 10.13.0"
+  },
+  "scripts": {
+    "start": "npm run build -- -w",
+    "clean": "del-cli dist",
+    "prebuild": "npm run clean",
+    "build": "cross-env NODE_ENV=production babel src -d dist --copy-files",
+    "commitlint": "commitlint --from=master",
+    "security": "npm audit",
+    "lint:prettier": "prettier \"{**/*,*}.{js,json,md,yml,css,ts}\" --list-different",
+    "lint:js": "eslint --cache .",
+    "lint": "npm-run-all -l -p \"lint:**\"",
+    "test:only": "cross-env NODE_ENV=test jest",
+    "test:watch": "npm run test:only -- --watch",
+    "test:coverage": "npm run test:only -- --collectCoverageFrom=\"src/**/*.js\" --coverage",
+    "pretest": "npm run lint",
+    "test": "npm run test:coverage",
+    "prepare": "npm run build",
+    "release": "standard-version",
+    "defaults": "webpack-defaults"
+  },
   "files": [
-    "index.js"
+    "dist"
   ],
   "peerDependencies": {
-    "eslint": ">=1.6.0 <4.0.0"
+    "eslint": "^6.0.0 || ^7.0.0",
+    "webpack": "^4.0.0 || ^5.0.0"
   },
   "dependencies": {
-    "find-cache-dir": "^0.1.1",
-    "loader-utils": "^0.2.7",
-    "object-assign": "^4.0.1"
+    "find-cache-dir": "^3.3.1",
+    "fs-extra": "^8.1.0",
+    "loader-utils": "^2.0.0",
+    "object-hash": "^2.0.3",
+    "schema-utils": "^2.6.5"
   },
   "devDependencies": {
-    "eslint": "^3.0.0",
-    "eslint-friendly-formatter": "^2.0.4",
-    "npmpub": "^3.0.1",
-    "tape": "^4.0.0",
-    "webpack": "^1.8.4"
+    "@babel/cli": "^7.8.4",
+    "@babel/core": "^7.9.0",
+    "@babel/preset-env": "^7.9.0",
+    "@commitlint/cli": "^8.3.5",
+    "@commitlint/config-conventional": "^8.3.4",
+    "@webpack-contrib/defaults": "^6.3.0",
+    "@webpack-contrib/eslint-config-webpack": "^3.0.0",
+    "babel-eslint": "^10.1.0",
+    "babel-jest": "^25.2.6",
+    "chokidar": "^3.3.1",
+    "commitlint-azure-pipelines-cli": "^1.0.3",
+    "cross-env": "^7.0.2",
+    "del": "^5.1.0",
+    "del-cli": "^3.0.0",
+    "eslint": "^6.8.0",
+    "eslint-config-prettier": "^6.10.1",
+    "eslint-friendly-formatter": "^4.0.1",
+    "eslint-plugin-import": "^2.20.2",
+    "husky": "^4.2.3",
+    "jest": "^25.2.6",
+    "jest-junit": "^10.0.0",
+    "lint-staged": "^10.1.1",
+    "npm-run-all": "^4.1.5",
+    "prettier": "^2.0.2",
+    "standard-version": "^7.1.0",
+    "webpack": "^4.42.1"
   },
-  "scripts": {
-    "lint": "eslint .",
-    "tape": "tape test/*.js",
-    "test": "npm run lint && npm run tape",
-    "release": "npmpub"
-  }
+  "keywords": [
+    "eslint",
+    "lint",
+    "linter",
+    "loader",
+    "webpack"
+  ]
 }

src/ESLintError.js

@@ -0,0 +1,7 @@
+export default class ESLintError extends Error {
+  constructor(messages) {
+    super(messages);
+    this.name = 'ESLintError';
+    this.stack = false;
+  }
+}

src/Linter.js

@@ -0,0 +1,207 @@
+import process from 'process';
+import { isAbsolute, join } from 'path';
+
+import { writeFileSync, ensureFileSync } from 'fs-extra';
+import { interpolateName } from 'loader-utils';
+
+import ESLintError from './ESLintError';
+import createEngine from './createEngine';
+
+export default class Linter {
+  constructor(loaderContext, options) {
+    this.loaderContext = loaderContext;
+    this.options = options;
+    this.resourcePath = this.parseResourcePath();
+
+    const { CLIEngine, engine } = createEngine(options);
+    this.CLIEngine = CLIEngine;
+    this.engine = engine;
+  }
+
+  parseResourcePath() {
+    const cwd = process.cwd();
+    let { resourcePath } = this.loaderContext;
+
+    // remove cwd from resource path in case webpack has been started from project
+    // root, to allow having relative paths in .eslintignore
+    // istanbul ignore next
+    if (resourcePath.indexOf(cwd) === 0) {
+      resourcePath = resourcePath.substr(cwd.length + (cwd === '/' ? 0 : 1));
+    }
+
+    return resourcePath;
+  }
+
+  lint(content) {
+    try {
+      return this.engine.executeOnText(content, this.resourcePath, true);
+    } catch (_) {
+      this.getEmitter(false)(_);
+
+      return { src: content };
+    }
+  }
+
+  printOutput(data) {
+    const { options } = this;
+
+    // skip ignored file warning
+    if (this.constructor.skipIgnoredFileWarning(data)) {
+      return;
+    }
+
+    // quiet filter done now
+    // eslint allow rules to be specified in the input between comments
+    // so we can found warnings defined in the input itself
+    const res = this.filter(data);
+
+    // if enabled, use eslint auto-fixing where possible
+    if (options.fix) {
+      this.autoFix(res);
+    }
+
+    // skip if no errors or warnings
+    if (res.errorCount < 1 && res.warningCount < 1) {
+      return;
+    }
+
+    const results = this.parseResults(res);
+
+    // Do not analyze if there are no results or eslint config
+    if (!results) {
+      return;
+    }
+
+    const messages = options.formatter(results);
+
+    this.reportOutput(results, messages);
+    this.failOnErrorOrWarning(res, messages);
+
+    const emitter = this.getEmitter(res);
+    emitter(new ESLintError(messages));
+  }
+
+  static skipIgnoredFileWarning(res) {
+    return (
+      res &&
+      res.warningCount === 1 &&
+      res.results &&
+      res.results[0] &&
+      res.results[0].messages[0] &&
+      res.results[0].messages[0].message &&
+      res.results[0].messages[0].message.indexOf('ignore') > 1
+    );
+  }
+
+  filter(data) {
+    const res = data;
+
+    // quiet filter done now
+    // eslint allow rules to be specified in the input between comments
+    // so we can found warnings defined in the input itself
+    if (
+      this.options.quiet &&
+      res &&
+      res.warningCount &&
+      res.results &&
+      res.results[0]
+    ) {
+      res.warningCount = 0;
+      res.results[0].warningCount = 0;
+      res.results[0].messages = res.results[0].messages.filter(
+        (message) => message.severity !== 1
+      );
+    }
+
+    return res;
+  }
+
+  autoFix(res) {
+    if (
+      res &&
+      res.results &&
+      res.results[0] &&
+      (res.results[0].output !== res.src ||
+        res.results[0].fixableErrorCount > 0 ||
+        res.results[0].fixableWarningCount > 0)
+    ) {
+      this.CLIEngine.outputFixes(res);
+    }
+  }
+
+  parseResults({ results }) {
+    // add filename for each results so formatter can have relevant filename
+    if (results) {
+      results.forEach((r) => {
+        // eslint-disable-next-line no-param-reassign
+        r.filePath = this.loaderContext.resourcePath;
+      });
+    }
+
+    return results;
+  }
+
+  reportOutput(results, messages) {
+    const { outputReport } = this.options;
+
+    if (!outputReport || !outputReport.filePath) {
+      return;
+    }
+
+    let content = messages;
+
+    // if a different formatter is passed in as an option use that
+    if (outputReport.formatter) {
+      content = outputReport.formatter(results);
+    }
+
+    let filePath = interpolateName(this.loaderContext, outputReport.filePath, {
+      content,
+    });
+
+    if (!isAbsolute(filePath)) {
+      filePath = join(
+        // eslint-disable-next-line no-underscore-dangle
+        this.loaderContext._compiler.options.output.path,
+        filePath
+      );
+    }
+
+    ensureFileSync(filePath);
+    writeFileSync(filePath, content);
+  }
+
+  failOnErrorOrWarning({ errorCount, warningCount }, messages) {
+    const { failOnError, failOnWarning } = this.options;
+
+    if (failOnError && errorCount) {
+      throw new ESLintError(
+        `Module failed because of a eslint error.\n${messages}`
+      );
+    }
+
+    if (failOnWarning && warningCount) {
+      throw new ESLintError(
+        `Module failed because of a eslint warning.\n${messages}`
+      );
+    }
+  }
+
+  getEmitter({ errorCount }) {
+    const { options, loaderContext } = this;
+
+    // default behavior: emit error only if we have errors
+    let emitter = errorCount
+      ? loaderContext.emitError
+      : loaderContext.emitWarning;
+
+    // force emitError or emitWarning if user want this
+    if (options.emitError) {
+      emitter = loaderContext.emitError;
+    } else if (options.emitWarning) {
+      emitter = loaderContext.emitWarning;
+    }
+
+    return emitter;
+  }
+}

src/cache.js

@@ -0,0 +1,187 @@
+/**
+ * Original Filesystem Cache implementation by babel-loader
+ * Licensed under the MIT License
+ *
+ * @see https://github.com/babel/babel-loader/commits/master/src/fs-cache.js
+ * @see https://github.com/babel/babel-loader/commits/master/src/cache.js
+ */
+
+/**
+ * Filesystem Cache
+ *
+ * Given a file and a transform function, cache the result into files
+ * or retrieve the previously cached files if the given file is already known.
+ *
+ * @see https://github.com/babel/babel-loader/issues/34
+ * @see https://github.com/babel/babel-loader/pull/41
+ */
+import fs from 'fs';
+import os from 'os';
+import { join } from 'path';
+import { promisify } from 'util';
+import zlib from 'zlib';
+import { createHash } from 'crypto';
+
+import findCacheDir from 'find-cache-dir';
+
+// Lazily instantiated when needed
+let defaultCacheDirectory = null;
+
+const readFile = promisify(fs.readFile);
+const writeFile = promisify(fs.writeFile);
+const gunzip = promisify(zlib.gunzip);
+const gzip = promisify(zlib.gzip);
+
+/**
+ * Read the contents from the compressed file.
+ *
+ * @async
+ * @params {String} filename
+ * @params {Boolean} compress
+ */
+const read = async (filename, compress) => {
+  const data = await readFile(filename + (compress ? '.gz' : ''));
+  const content = compress ? await gunzip(data) : data;
+
+  return JSON.parse(content.toString());
+};
+
+/**
+ * Write contents into a compressed file.
+ *
+ * @async
+ * @params {String} filename
+ * @params {Boolean} compress
+ * @params {String} result
+ */
+const write = async (filename, compress, result) => {
+  const content = JSON.stringify(result);
+
+  const data = compress ? await gzip(content) : content;
+  return writeFile(filename + (compress ? '.gz' : ''), data);
+};
+
+/**
+ * Build the filename for the cached file
+ *
+ * @params {String} source  File source code
+ * @params {String} identifier
+ * @params {Object} options Options used
+ *
+ * @return {String}
+ */
+const filename = (source, identifier, options) => {
+  const hash = createHash('md4');
+
+  const contents = JSON.stringify({ source, options, identifier });
+
+  hash.update(contents);
+
+  return `${hash.digest('hex')}.json`;
+};
+
+/**
+ * Handle the cache
+ *
+ * @params {String} directory
+ * @params {Object} params
+ */
+const handleCache = async (directory, params) => {
+  const {
+    source,
+    options = {},
+    transform,
+    cacheIdentifier,
+    cacheDirectory,
+    cacheCompression,
+  } = params;
+
+  const file = join(directory, filename(source, cacheIdentifier, options));
+
+  try {
+    // No errors mean that the file was previously cached
+    // we just need to return it
+    return await read(file, cacheCompression);
+    // eslint-disable-next-line no-empty
+  } catch (err) {}
+
+  const fallback =
+    typeof cacheDirectory !== 'string' && directory !== os.tmpdir();
+
+  // Make sure the directory exists.
+  try {
+    fs.mkdirSync(directory, { recursive: true });
+  } catch (err) {
+    if (fallback) {
+      return handleCache(os.tmpdir(), params);
+    }
+
+    throw err;
+  }
+
+  // Otherwise just transform the file
+  // return it to the user asap and write it in cache
+  const result = await transform(source, options);
+
+  try {
+    await write(file, cacheCompression, result);
+  } catch (err) {
+    if (fallback) {
+      // Fallback to tmpdir if node_modules folder not writable
+      return handleCache(os.tmpdir(), params);
+    }
+
+    throw err;
+  }
+
+  return result;
+};
+
+/**
+ * Retrieve file from cache, or create a new one for future reads
+ *
+ * @async
+ * @param  {Object}   params
+ * @param  {String}   params.cacheDirectory  Directory to store cached files
+ * @param  {String}   params.cacheIdentifier Unique identifier to bust cache
+ * @param  {Boolean}  params.cacheCompression
+ * @param  {String}   params.source   Original contents of the file to be cached
+ * @param  {Object}   params.options  Options to be given to the transform fn
+ * @param  {Function} params.transform  Function that will transform the
+ *                                      original file and whose result will be
+ *                                      cached
+ *
+ * @example
+ *
+ *   cache({
+ *     cacheDirectory: '.tmp/cache',
+ *     cacheIdentifier: 'babel-loader-cachefile',
+ *     cacheCompression: true,
+ *     source: *source code from file*,
+ *     options: {
+ *       experimental: true,
+ *       runtime: true
+ *     },
+ *     transform: function(source, options) {
+ *       var content = *do what you need with the source*
+ *       return content;
+ *     }
+ *   });
+ */
+
+module.exports = async (params) => {
+  let directory;
+
+  if (typeof params.cacheDirectory === 'string') {
+    directory = params.cacheDirectory;
+  } else {
+    if (defaultCacheDirectory === null) {
+      defaultCacheDirectory =
+        findCacheDir({ name: 'eslint-loader' }) || os.tmpdir();
+    }
+
+    directory = defaultCacheDirectory;
+  }
+
+  return handleCache(directory, params);
+};

src/cacheLoader.js

@@ -0,0 +1,35 @@
+import { version } from '../package.json';
+
+import cache from './cache';
+
+export default function cacheLoader(linter, content, map) {
+  const { loaderContext, options, CLIEngine } = linter;
+  const callback = loaderContext.async();
+  const cacheIdentifier = JSON.stringify({
+    'eslint-loader': version,
+    eslint: CLIEngine.version,
+  });
+
+  cache({
+    cacheDirectory: options.cache,
+    cacheIdentifier,
+    cacheCompression: true,
+    options,
+    source: content,
+    transform() {
+      return linter.lint(content);
+    },
+  })
+    .then((res) => {
+      try {
+        linter.printOutput({ ...res, src: content });
+      } catch (error) {
+        return callback(error, content, map);
+      }
+      return callback(null, content, map);
+    })
+    .catch((err) => {
+      // istanbul ignore next
+      return callback(err);
+    });
+}

src/cjs.js

@@ -0,0 +1,3 @@
+const loader = require('./index');
+
+module.exports = loader.default;

src/createEngine.js

@@ -0,0 +1,17 @@
+import objectHash from 'object-hash';
+
+const engines = {};
+
+export default function createEngine(options) {
+  const { CLIEngine } = require(options.eslintPath);
+  const hash = objectHash(options);
+
+  if (!engines[hash]) {
+    engines[hash] = new CLIEngine(options);
+  }
+
+  return {
+    CLIEngine,
+    engine: engines[hash],
+  };
+}

src/getOptions.js

@@ -0,0 +1,46 @@
+import loaderUtils from 'loader-utils';
+import validateOptions from 'schema-utils';
+
+import schema from './options.json';
+
+export default function getOptions(loaderContext) {
+  const options = {
+    eslintPath: 'eslint',
+    ...loaderUtils.getOptions(loaderContext),
+  };
+
+  validateOptions(schema, options, {
+    name: 'ESLint Loader',
+    baseDataPath: 'options',
+  });
+
+  const { CLIEngine } = require(options.eslintPath);
+
+  options.formatter = getFormatter(CLIEngine, options.formatter);
+
+  if (options.outputReport && options.outputReport.formatter) {
+    options.outputReport.formatter = getFormatter(
+      CLIEngine,
+      options.outputReport.formatter
+    );
+  }
+
+  return options;
+}
+
+function getFormatter(CLIEngine, formatter) {
+  if (typeof formatter === 'function') {
+    return formatter;
+  }
+
+  // Try to get oficial formatter
+  if (typeof formatter === 'string') {
+    try {
+      return CLIEngine.getFormatter(formatter);
+    } catch (e) {
+      // ignored
+    }
+  }
+
+  return CLIEngine.getFormatter('stylish');
+}

src/index.js

@@ -0,0 +1,19 @@
+import getOptions from './getOptions';
+import Linter from './Linter';
+import cacheLoader from './cacheLoader';
+
+export default function loader(content, map) {
+  const options = getOptions(this);
+  const linter = new Linter(this, options);
+
+  this.cacheable();
+
+  // return early if cached
+  if (options.cache) {
+    cacheLoader(linter, content, map);
+    return;
+  }
+
+  linter.printOutput(linter.lint(content));
+  this.callback(null, content, map);
+}

src/options.json

@@ -0,0 +1,64 @@
+{
+  "type": "object",
+  "additionalProperties": true,
+  "properties": {
+    "cache": {
+      "description": "This option will enable caching of the linting results into a file. This is particularly useful in reducing linting time when doing a full build.",
+      "anyOf": [{ "type": "boolean" }, { "type": "string" }]
+    },
+    "eslintPath": {
+      "description": "Path to `eslint` instance that will be used for linting. If the `eslintPath` is a folder like a official eslint, or specify a `formatter` option. now you dont have to install `eslint` .",
+      "type": "string"
+    },
+    "formatter": {
+      "description": "Loader accepts a function that will have one argument: an array of eslint messages (object). The function must return the output as a string.",
+      "anyOf": [{ "type": "string" }, { "instanceof": "Function" }]
+    },
+    "fix": {
+      "description": "This option will enable ESLint autofix feature",
+      "type": "boolean"
+    },
+    "emitError": {
+      "description": "Loader will always return errors if this option is set to `true`.",
+      "type": "boolean"
+    },
+    "emitWarning": {
+      "description": "Loader will always return warnings if option is set to `true`. If you're using hot module replacement, you may wish to enable this in development, or else updates will be skipped when there's an eslint error.",
+      "type": "boolean"
+    },
+    "failOnError": {
+      "description": "Loader will cause the module build to fail if there are any eslint errors.",
+      "type": "boolean"
+    },
+    "failOnWarning": {
+      "description": "Loader will cause the module build to fail if there are any eslint warnings.",
+      "type": "boolean"
+    },
+    "quiet": {
+      "description": "Loader will process and report errors only and ignore warnings if this option is set to true",
+      "type": "boolean"
+    },
+    "outputReport": {
+      "description": "Write the output of the errors to a file, for example a checkstyle xml file for use for reporting on Jenkins CI",
+      "anyOf": [
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "object",
+          "additionalProperties": false,
+          "properties": {
+            "filePath": {
+              "description": "The `filePath` is relative to the webpack config: output.path",
+              "anyOf": [{ "type": "string" }]
+            },
+            "formatter": {
+              "description": "You can pass in a different formatter for the output file, if none is passed in the default/configured formatter will be used",
+              "anyOf": [{ "type": "string" }, { "instanceof": "Function" }]
+            }
+          }
+        }
+      ]
+    }
+  }
+}

test/Linter.test.js

@@ -0,0 +1,31 @@
+import Linter from '../src/Linter';
+
+describe('Linter', () => {
+  let linter;
+
+  beforeAll(() => {
+    const loaderContext = {
+      resourcePath: 'test',
+    };
+
+    const options = {
+      eslintPath: 'eslint',
+      ignore: false,
+      formatter: jest.fn(),
+    };
+
+    linter = new Linter(loaderContext, options);
+  });
+
+  it('should parse undefined results without error', () => {
+    expect(linter.parseResults({})).toBeUndefined();
+  });
+
+  it('should parse results correctly', () => {
+    const res = {
+      results: [{ filePath: '' }],
+    };
+
+    expect(linter.parseResults(res)).toEqual([{ filePath: 'test' }]);
+  });
+});

test/autofix-stop.test.js

@@ -0,0 +1,36 @@
+import { join } from 'path';
+
+import { copySync, removeSync } from 'fs-extra';
+import chokidar from 'chokidar';
+
+import pack from './utils/pack';
+
+describe('autofix stop', () => {
+  const entry = join(__dirname, 'fixtures/nonfixable-clone.js');
+
+  let changed = false;
+  let watcher;
+
+  beforeAll(() => {
+    copySync(join(__dirname, 'fixtures/nonfixable.js'), entry);
+
+    watcher = chokidar.watch(entry);
+    watcher.on('change', () => {
+      changed = true;
+    });
+  });
+
+  afterAll(() => {
+    watcher.close();
+    removeSync(entry);
+  });
+
+  it('should not change file if there are no fixable errors/warnings', (done) => {
+    const compiler = pack('nonfixable-clone', { fix: true });
+
+    compiler.run(() => {
+      expect(changed).toBe(false);
+      done();
+    });
+  });
+});

test/autofix.test.js

@@ -0,0 +1,27 @@
+import { join } from 'path';
+
+import { copySync, removeSync } from 'fs-extra';
+
+import pack from './utils/pack';
+
+describe('autofix stop', () => {
+  const entry = join(__dirname, 'fixtures/fixable-clone.js');
+
+  beforeAll(() => {
+    copySync(join(__dirname, 'fixtures/fixable.js'), entry);
+  });
+
+  afterAll(() => {
+    removeSync(entry);
+  });
+
+  it('should not throw error if file ok after auto-fixing', (done) => {
+    const compiler = pack('fixable-clone', { fix: true });
+
+    compiler.run((err, stats) => {
+      expect(stats.hasWarnings()).toBe(false);
+      expect(stats.hasErrors()).toBe(false);
+      done();
+    });
+  });
+});

test/cache.test.js

@@ -0,0 +1,168 @@
+import { join } from 'path';
+import fs from 'fs';
+
+import { readdirSync, removeSync } from 'fs-extra';
+import webpack from 'webpack';
+
+const defaultCacheDir = join(__dirname, '../node_modules/.cache/eslint-loader');
+const cacheDir = join(__dirname, 'output/cache/cachefiles');
+const outputDir = join(__dirname, 'output/cache');
+const eslintLoader = join(__dirname, '../src/index');
+const globalConfig = {
+  entry: join(__dirname, 'fixtures/cache.js'),
+  module: {
+    rules: [
+      {
+        test: /\.js$/,
+        exclude: /node_modules/,
+        use: eslintLoader,
+      },
+    ],
+  },
+};
+
+function createTestDirectory(dir) {
+  const directory = join(dir, 'cache');
+
+  removeSync(directory);
+  fs.mkdirSync(directory, { recursive: true });
+
+  return directory;
+}
+
+describe('cache', () => {
+  let directory;
+  let cache;
+
+  beforeEach(() => {
+    directory = createTestDirectory(outputDir);
+    cache = createTestDirectory(cacheDir);
+    removeSync(defaultCacheDir);
+  });
+
+  afterEach(() => {
+    removeSync(cache);
+    removeSync(directory);
+  });
+
+  it('should output files to cache directory', (done) => {
+    const compiler = webpack({
+      ...globalConfig,
+      output: {
+        path: directory,
+      },
+      module: {
+        rules: [
+          {
+            test: /\.js$/,
+            exclude: /node_modules/,
+            use: `${eslintLoader}?cache=${cache}`,
+          },
+        ],
+      },
+    });
+    compiler.run(() => {
+      const files = readdirSync(cache);
+      expect(files.length).toBeGreaterThan(0);
+      done();
+    });
+  });
+
+  it('should output files to standard cache dir if set to true in query', (done) => {
+    const compiler = webpack({
+      ...globalConfig,
+      output: {
+        path: directory,
+      },
+      module: {
+        rules: [
+          {
+            test: /\.jsx?/,
+            exclude: /node_modules/,
+            use: `${eslintLoader}?cache=true`,
+          },
+        ],
+      },
+    });
+    compiler.run(() => {
+      const files = readdirSync(defaultCacheDir).filter((file) =>
+        /\b[0-9a-f]{5,40}\.json\.gz\b/.test(file)
+      );
+      expect(files.length).toBeGreaterThan(0);
+      done();
+    });
+  });
+
+  it('should read from cache directory if cached file exists', (done) => {
+    const compiler = webpack({
+      ...globalConfig,
+      output: {
+        path: directory,
+      },
+      module: {
+        rules: [
+          {
+            test: /\.jsx?/,
+            exclude: /node_modules/,
+            use: `${eslintLoader}?cache=${cache}`,
+          },
+        ],
+      },
+    });
+    compiler.run(() => {
+      const files = readdirSync(cache);
+      expect(files.length).toBe(3);
+      done();
+    });
+  });
+
+  it('should generate a new file if the identifier changes', (done) => {
+    const configs = [
+      {
+        ...globalConfig,
+        output: {
+          path: directory,
+        },
+        module: {
+          rules: [
+            {
+              test: /\.jsx?/,
+              exclude: /node_modules/,
+              use: `${eslintLoader}?cache=${cache}&cacheIdentifier=a`,
+            },
+          ],
+        },
+      },
+      {
+        ...globalConfig,
+        output: {
+          path: directory,
+        },
+        module: {
+          rules: [
+            {
+              test: /\.jsx?/,
+              exclude: /node_modules/,
+              use: `${eslintLoader}?cache=${cache}&cacheIdentifier=b`,
+            },
+          ],
+        },
+      },
+    ];
+
+    let counter = configs.length;
+
+    configs.forEach((config) => {
+      const compiler = webpack(config);
+      compiler.run(() => {
+        counter -= 1;
+
+        if (!counter) {
+          const files = readdirSync(cache);
+          expect(files.length).toBe(6);
+          done();
+        }
+      });
+    });
+  });
+});

test/cjs.test.js

@@ -0,0 +1,8 @@
+import EslintLoader from '../src';
+import CJSEslintLoader from '../src/cjs';
+
+describe('cjs', () => {
+  it('should exported plugin', () => {
+    expect(CJSEslintLoader).toEqual(EslintLoader);
+  });
+});

test/error.test.js

@@ -0,0 +1,12 @@
+import pack from './utils/pack';
+
+describe('error', () => {
+  it('should return error if file is bad', (done) => {
+    const compiler = pack('error');
+
+    compiler.run((err, stats) => {
+      expect(stats.hasErrors()).toBe(true);
+      done();
+    });
+  });
+});

test/eslint-path.test.js

@@ -0,0 +1,16 @@
+import { join } from 'path';
+
+import pack from './utils/pack';
+
+describe('eslint path', () => {
+  it('should use another instance of eslint via eslintPath config', (done) => {
+    const eslintPath = join(__dirname, 'mock/eslint');
+    const compiler = pack('good', { eslintPath });
+
+    compiler.run((err, stats) => {
+      expect(stats.hasErrors()).toBe(true);
+      expect(stats.compilation.errors[0].message).toContain('Fake error');
+      done();
+    });
+  });
+});

test/eslintignore.test.js

@@ -0,0 +1,12 @@
+import pack from './utils/pack';
+
+describe('eslintignore', () => {
+  it('should ignores files present in .eslintignore', (done) => {
+    const compiler = pack('ignore', { ignore: true });
+
+    compiler.run((err, stats) => {
+      expect(stats.hasWarnings()).toBe(false);
+      done();
+    });
+  });
+});

test/fail-on-error.test.js

@@ -0,0 +1,30 @@
+import pack from './utils/pack';
+
+describe('fail on error', () => {
+  it('should emits errors', (done) => {
+    const compiler = pack('error', { failOnError: true });
+
+    compiler.run((err, stats) => {
+      expect(stats.hasErrors()).toBe(true);
+      done();
+    });
+  });
+
+  it('should correctly indentifies a success', (done) => {
+    const compiler = pack('good', { failOnError: true });
+
+    compiler.run((err, stats) => {
+      expect(stats.hasErrors()).toBe(false);
+      done();
+    });
+  });
+
+  it('should emits errors when cache enabled', (done) => {
+    const compiler = pack('error', { failOnError: true, cache: true });
+
+    compiler.run((err, stats) => {
+      expect(stats.hasErrors()).toBe(true);
+      done();
+    });
+  });
+});

test/fail-on-warning.test.js

@@ -0,0 +1,30 @@
+import pack from './utils/pack';
+
+describe('fail on warning', () => {
+  it('should emits errors', (done) => {
+    const compiler = pack('warn', { failOnWarning: true });
+
+    compiler.run((err, stats) => {
+      expect(stats.hasErrors()).toBe(true);
+      done();
+    });
+  });
+
+  it('should correctly indentifies a success', (done) => {
+    const compiler = pack('good', { failOnWarning: true });
+
+    compiler.run((err, stats) => {
+      expect(stats.hasErrors()).toBe(false);
+      done();
+    });
+  });
+
+  it('should emits errors when cache enabled', (done) => {
+    const compiler = pack('error', { failOnWarning: true, cache: true });
+
+    compiler.run((err, stats) => {
+      expect(stats.hasErrors()).toBe(true);
+      done();
+    });
+  });
+});

test/fixtures/cache.js

@@ -0,0 +1,9 @@
+"use strict"
+
+require("./require")
+
+function cacheIt() {
+  return "cache"
+}
+
+cacheIt()

test/fixtures/error-multi-one.js

@@ -0,0 +1 @@
+var inone = stuff

test/fixtures/error-multi-two.js

@@ -0,0 +1 @@
+var intwo = stuff

test/fixtures/error-multi.js

@@ -0,0 +1 @@
+var foo = stuff

test/fixtures/fixable.js

@@ -1,5 +1,7 @@
+'use strict'
+
 function foo() {
-return true;
+  return true
 }
 
- foo();
+foo()

test/fixtures/good-semi.js

@@ -1,7 +1,5 @@
-"use strict";
-
 function test() {
-  return "value";
+  return 'value'
 }
 
-test();
+test()

test/fixtures/good.js

@@ -1,5 +1,3 @@
-"use strict"
-
 function test() {
   return "value"
 }

test/fixtures/ignore.js

@@ -1,2 +1,2 @@
 // this file should be totally ignore since it's present in .eslintignore
-var -dasdas;
+var -dasdas;

test/fixtures/nonfixable.js

@@ -0,0 +1,5 @@
+function foo() {
+  return stuff;
+}
+
+foo();

test/fixtures/require.js

@@ -0,0 +1,3 @@
+"use strict"
+
+require("./good")

test/fixtures/warn.js

@@ -1,2 +1,2 @@
-/* eslint no-unused-vars: 1 */
-var foo = this
+/* eslint no-unused-vars: warn */
+const foo = this

test/force-emit-error.test.js

@@ -0,0 +1,13 @@
+import pack from './utils/pack';
+
+describe('force emit error', () => {
+  it('should force to emit error', (done) => {
+    const compiler = pack('warn', { emitError: true });
+
+    compiler.run((err, stats) => {
+      expect(stats.hasWarnings()).toBe(false);
+      expect(stats.hasErrors()).toBe(true);
+      done();
+    });
+  });
+});

test/force-emit-warning.test.js

@@ -0,0 +1,13 @@
+import pack from './utils/pack';
+
+describe('force emit warning', () => {
+  it('should force to emit warning', (done) => {
+    const compiler = pack('error', { emitWarning: true });
+
+    compiler.run((err, stats) => {
+      expect(stats.hasWarnings()).toBe(true);
+      expect(stats.hasErrors()).toBe(false);
+      done();
+    });
+  });
+});

test/formatter-custom.test.js

@@ -0,0 +1,23 @@
+import pack from './utils/pack';
+
+describe('formatter eslint', () => {
+  it('should use custom formatter as function', (done) => {
+    const formatter = require('eslint-friendly-formatter');
+    const compiler = pack('error', { formatter });
+
+    compiler.run((err, stats) => {
+      expect(stats.compilation.errors[0].message).toBeTruthy();
+      done();
+    });
+  });
+
+  it('should use custom formatter as string', (done) => {
+    const formatter = 'eslint-friendly-formatter';
+    const compiler = pack('error', { formatter });
+
+    compiler.run((err, stats) => {
+      expect(stats.compilation.errors[0].message).toBeTruthy();
+      done();
+    });
+  });
+});

test/formatter-eslint.test.js

@@ -0,0 +1,12 @@
+import pack from './utils/pack';
+
+describe('formatter eslint', () => {
+  it('should use eslint formatter', (done) => {
+    const compiler = pack('error');
+
+    compiler.run((err, stats) => {
+      expect(stats.compilation.errors[0].message).toBeTruthy();
+      done();
+    });
+  });
+});

test/formatter-multiple-entries.test.js

@@ -0,0 +1,41 @@
+import { basename, join } from 'path';
+
+import { readFileSync } from 'fs-extra';
+import { CLIEngine } from 'eslint';
+import webpack from 'webpack';
+
+import conf from './utils/conf';
+
+describe('formatter multiple entries', () => {
+  it('should be configured to write multiple eslint result files', (done) => {
+    const formatter = CLIEngine.getFormatter('checkstyle');
+    const outputFilename = 'outputReport-[name].txt';
+    const config = conf(
+      [
+        join(__dirname, 'fixtures/error-multi-two.js'),
+        join(__dirname, 'fixtures/error-multi-one.js'),
+        join(__dirname, 'fixtures/error-multi.js'),
+      ],
+      {
+        formatter,
+        outputReport: {
+          filePath: outputFilename,
+          formatter,
+        },
+      }
+    );
+
+    const compiler = webpack(config);
+
+    compiler.run((err, stats) => {
+      stats.compilation.errors.forEach((e) => {
+        const name = basename(e.module.resource, '.js');
+        const filename = join(config.output.path, `outputReport-${name}.txt`);
+        const contents = readFileSync(filename, 'utf8');
+        expect(e.error.message).toBe(contents);
+      });
+
+      done();
+    });
+  });
+});

test/formatter-official.test.js

@@ -0,0 +1,12 @@
+import pack from './utils/pack';
+
+describe('formatter official', () => {
+  it('should use official formatter', (done) => {
+    const compiler = pack('error', { formatter: 'table' });
+
+    compiler.run((err, stats) => {
+      expect(stats.compilation.errors[0].message).toBeTruthy();
+      done();
+    });
+  });
+});

test/formatter-write.test.js

@@ -0,0 +1,51 @@
+import { join } from 'path';
+
+import { readFileSync } from 'fs-extra';
+import { CLIEngine } from 'eslint';
+import webpack from 'webpack';
+
+import conf from './utils/conf';
+
+describe('formatter write', () => {
+  it('should configured to write eslint results to a file (relative path)', (done) => {
+    const outputFilename = 'outputReport-relative.txt';
+    const loaderOptions = {
+      formatter: CLIEngine.getFormatter('checkstyle'),
+      outputReport: {
+        filePath: outputFilename,
+      },
+    };
+
+    const config = conf('error', loaderOptions);
+    const compiler = webpack(config);
+
+    compiler.run((err, stats) => {
+      const filePath = join(config.output.path, outputFilename);
+      const contents = readFileSync(filePath, 'utf8');
+
+      expect(stats.compilation.errors[0].error.message).toBe(contents);
+      done();
+    });
+  });
+
+  it('should configured to write eslint results to a file (absolute path)', (done) => {
+    const outputFilename = 'outputReport-absolute.txt';
+    const outputFilepath = join(__dirname, 'output', outputFilename);
+    const loaderOptions = {
+      formatter: CLIEngine.getFormatter('checkstyle'),
+      outputReport: {
+        filePath: outputFilepath,
+      },
+    };
+
+    const config = conf('error', loaderOptions);
+    const compiler = webpack(config);
+
+    compiler.run((err, stats) => {
+      const contents = readFileSync(outputFilepath, 'utf8');
+
+      expect(stats.compilation.errors[0].error.message).toBe(contents);
+      done();
+    });
+  });
+});

test/mock/eslint/index.js

@@ -0,0 +1,58 @@
+function CLIEngine() {}
+
+CLIEngine.prototype.executeOnText = function executeOnText() {
+  return {
+    results: [
+      {
+        filePath: '',
+        messages: [
+          {
+            ruleId: 'no-undef',
+            severity: 2,
+            message: 'Fake error',
+            line: 1,
+            column: 11,
+            nodeType: 'Identifier',
+            source: 'var foo = stuff',
+          },
+        ],
+        errorCount: 2,
+        warningCount: 0,
+        fixableErrorCount: 0,
+        fixableWarningCount: 0,
+        source: '',
+      },
+    ],
+    errorCount: 2,
+    warningCount: 0,
+    fixableErrorCount: 0,
+    fixableWarningCount: 0,
+  };
+};
+
+CLIEngine.prototype.getFormatter = function getFormatter(format) {
+  const resolvedFormatName = format || 'stylish';
+
+  if (typeof resolvedFormatName !== 'string') {
+    return null;
+  }
+
+  const eslintVersion = require('./package.json').version;
+  const formatterPath =
+    eslintVersion >= '6.0.0'
+      ? './lib/cli-engine/formatters/stylish'
+      : './lib/formatters/stylish';
+
+  try {
+    return require(formatterPath);
+  } catch (ex) {
+    ex.message = `There was a problem loading formatter: ${formatterPath}\nError: ${ex.message}`;
+    throw ex;
+  }
+};
+
+CLIEngine.getFormatter = CLIEngine.prototype.getFormatter;
+
+module.exports = {
+  CLIEngine,
+};

test/mock/eslint/lib/cli-engine/formatters/stylish.js

@@ -0,0 +1,3 @@
+module.exports = function formatter(result) {
+  return JSON.stringify(result);
+};

test/mock/eslint/lib/formatters/stylish.js

@@ -0,0 +1,3 @@
+module.exports = function formatter(result) {
+  return JSON.stringify(result);
+};

test/mock/eslint/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "eslint",
+  "version": "5.16.0"
+}

test/multiple-engines.test.js

@@ -0,0 +1,52 @@
+import { join } from 'path';
+
+import pack from './utils/pack';
+
+describe('multiple engines', () => {
+  it('should will create an engine for each unique config', (done) => {
+    const loader = join(__dirname, '../src/index');
+    const compiler = pack(
+      'good',
+      {},
+      {
+        module: {
+          rules: [
+            {
+              test: /\.js$/,
+              exclude: /node_modules/,
+              loader,
+              options: {
+                ignore: false,
+                rules: {
+                  quotes: [1, 'single'],
+                },
+              },
+            },
+            {
+              test: /\.js$/,
+              exclude: /node_modules/,
+              loader,
+              options: {
+                ignore: false,
+                rules: {
+                  semi: [1, 'always'],
+                },
+              },
+            },
+          ],
+        },
+      }
+    );
+
+    compiler.run((err, stats) => {
+      const { warnings } = stats.compilation;
+      const quotes = warnings.find((warning) => /quotes/.test(warning));
+      const semi = warnings.find((warning) => /semi/.test(warning));
+
+      expect(warnings.length).toBe(2);
+      expect(quotes).toBeTruthy();
+      expect(semi).toBeTruthy();
+      done();
+    });
+  });
+});

test/no-eslint-configuration.test.js

@@ -0,0 +1,15 @@
+import pack from './utils/pack';
+
+describe('no eslint configuration', () => {
+  it('should emit warning when there is no eslint configuration', (done) => {
+    const compiler = pack('good', { cwd: '/' });
+
+    compiler.run((err, stats) => {
+      expect(stats.hasWarnings()).toBe(true);
+
+      const { warnings } = stats.compilation;
+      expect(warnings[0].message).toMatch(/No ESLint configuration/i);
+      done();
+    });
+  });
+});

test/ok.test.js

@@ -0,0 +1,13 @@
+import pack from './utils/pack';
+
+describe('ok', () => {
+  it("should don't throw error if file is ok", (done) => {
+    const compiler = pack('good');
+
+    compiler.run((err, stats) => {
+      expect(stats.hasWarnings()).toBe(false);
+      expect(stats.hasErrors()).toBe(false);
+      done();
+    });
+  });
+});

test/parameters.test.js

@@ -0,0 +1,13 @@
+import pack from './utils/pack';
+
+describe('parameters', () => {
+  it('should supports query strings parameters', (done) => {
+    const compiler = pack('good', { rules: { semi: 0 } });
+
+    compiler.run((err, stats) => {
+      expect(stats.hasWarnings()).toBe(false);
+      expect(stats.hasErrors()).toBe(false);
+      done();
+    });
+  });
+});

test/quiet.test.js

@@ -0,0 +1,13 @@
+import pack from './utils/pack';
+
+describe('quiet', () => {
+  it('should not emit warnings if quiet is set', (done) => {
+    const compiler = pack('warn', { quiet: true });
+
+    compiler.run((err, stats) => {
+      expect(stats.hasWarnings()).toBe(false);
+      expect(stats.hasErrors()).toBe(false);
+      done();
+    });
+  });
+});

test/utils/conf.js

@@ -1,21 +1,36 @@
-module.exports = {
-  output: {
-    path: "./test/output/",
-    filename: "bundle.js",
-  },
-  module: {
-    loaders: [
-      {
-        test: /\.js$/,
-        loader: "./index",
-        exclude: /node_modules/,
-      },
-    ],
-  },
-  // this disables the use of .eslintignore, since it contains the fixtures
-  // folder to skip it on the global linting, but here we want the opposite
-  // (we only use .eslintignore on the test that checks this)
-  eslint: {
-    ignore: false,
-  },
-}
+import { join } from 'path';
+
+export default (entry, loaderConf = {}, webpackConf = {}) => {
+  const testDir = join(__dirname, '..');
+  const fixturesDir = join(testDir, 'fixtures');
+
+  return {
+    entry: typeof entry === 'string' ? join(fixturesDir, `${entry}.js`) : entry,
+    mode: 'development',
+    output: {
+      path: join(testDir, 'output'),
+      filename: 'bundle.js',
+    },
+    module: {
+      rules: [
+        {
+          test: /\.js$/,
+          exclude: /node_modules/,
+          use: [
+            {
+              loader: join(testDir, '../src/index'),
+              options: {
+                // this disables the use of .eslintignore, since it contains the fixtures
+                // folder to skip it on the global linting, but here we want the opposite
+                // (we only use .eslintignore on the test that checks this)
+                ignore: false,
+                ...loaderConf,
+              },
+            },
+          ],
+        },
+      ],
+    },
+    ...webpackConf,
+  };
+};

test/utils/pack.js

@@ -0,0 +1,7 @@
+import webpack from 'webpack';
+
+import conf from './conf';
+
+export default (entry, loaderConf = {}, webpackConf = {}) => {
+  return webpack(conf(entry, loaderConf, webpackConf));
+};

test/warning.test.js

@@ -0,0 +1,13 @@
+import pack from './utils/pack';
+
+describe('warning', () => {
+  it('should emit warnings', (done) => {
+    const compiler = pack('warn');
+
+    compiler.run((err, stats) => {
+      expect(stats.hasWarnings()).toBe(true);
+      expect(stats.hasErrors()).toBe(false);
+      done();
+    });
+  });
+});