.eslintrc

@@ -1,24 +1,19 @@
 {
-    "rules": {
-        "indent": [ 2, "tab", { "SwitchCase": 1 } ],
-        "quotes": [ 2, "single" ],
-        "linebreak-style": [ 2, "unix" ],
-        "semi": [ 2, "always" ],
-        "keyword-spacing": [ 2, { "before": true, "after": true } ],
-        "space-before-blocks": [ 2, "always" ],
-        "space-before-function-paren": [ 2, "always" ],
-        "no-mixed-spaces-and-tabs": [ 2, "smart-tabs" ],
-        "no-cond-assign": [ 0 ]
-    },
-    "env": {
-        "es6": true,
-        "browser": true,
-        "mocha": true,
-        "node": true
-    },
-    "extends": "eslint:recommended",
-    "parserOptions": {
-        "sourceType": "module",
-        "ecmaVersion": 6
-    }
+	"extends": ["eslint:recommended", "prettier", "plugin:prettier/recommended"],
+	"rules": {
+		"no-cond-assign": [0]
+	},
+	"env": {
+		"es6": true,
+		"browser": true,
+		"mocha": true,
+		"node": true
+	},
+	"parserOptions": {
+		"sourceType": "module",
+		"ecmaVersion": 2018,
+		"ecmaFeatures": {
+			"spread": true
+		}
+	}
 }

.gitignore

@@ -1,3 +1,4 @@
 .DS_Store
 node_modules
 dist
+*.log

.huskyrc

@@ -0,0 +1,5 @@
+{
+  "hooks": {
+    "pre-commit": "lint-staged"
+  }
+}

.lintstagedrc

@@ -0,0 +1,3 @@
+{
+  "*.{js,md}": ["prettier --write", "git add"]
+}

.prettierrc

@@ -0,0 +1,6 @@
+{
+  "printWidth": 120,
+  "singleQuote": true,
+  "trailingComma": "all",
+  "useTabs": true
+}

.travis.yml

@@ -1,5 +1,5 @@
 language: node_js
 node_js:
-  - 'stable'
+  - '10'
+  - '8'
   - '6'
-  - '4'

CHANGELOG.md

@@ -1,94 +1,151 @@
-# rollup-plugin-babel changelog
+## 4.3.2
+
+- Fixed usage with `externalHelpers: true` option
+
+## 4.3.1
+
+- Add `.js` extension to the virtual babel helpers file (only matters when using `preserveModules` option in rollup)
+
+## 4.3.0
+
+- Added `.custom` builder.
+- Fail build when a plugin tries to add non existent babel helper
+
+## 4.2.0
+
+Allow `rollup@1` as peer dependency.
+
+## 4.1.0
+
+- Fixed "preflight check" for ignored files.
+- Return `null` when no transformation has been done (fixing source maps for this case)
+
+## 4.0.3
+
+Fixed fallback class transform in "preflight check".
+
+## 4.0.2
+
+Fixed `rollup` peer dependency.
+
+## 4.0.0
+
+Babel 7 compatible! (dropped Babel 6 compatibility though).
+
+Additionally:
+
+- Internal preflight checks are created now per plugin instance, so using 2 instances of rollup-plugin-babel (i.e. targeting 2 different set of files with include/exclude options) shouldn't conflict with each other
+- Transpiling by default only what Babel transpiles - files with those extensions: .js, .jsx, .es6, .es, .mjs. You can customize this with new `extensions` option. This also fixes long standing issue with rollup-plugin-babel trying to transform JSON files.
+
+## 3.0.3
+
+- Drop babel7 support. Use 4.0.0-beta if you use babel 7
+- Use "module" in addition to "jsnext:main" ([#150](https://github.com/rollup/rollup-plugin-babel/issues/150))
+- Remove unused babel helpers namespace declaration & expression ([#164](https://github.com/rollup/rollup-plugin-babel/issues/164))
+
+## 3.0.2
+
+- Fix regression with Babel 6 ([#158](https://github.com/rollup/rollup-plugin-babel/issues/158))
+
+## 3.0.1
+
+- Wasn't working, fix bug with transform (not using es2015-classes for preflight check)
+
+## 3.0.0
+
+- Drop Node 0.10/0.12 (Use native `Object.assign`)
+- Change `babel-core` to be a peerDependency
+- Support `babel-core` v7 as well as a peerDep (no changes necessary)
 
 ## 2.7.1
 
-* Prevent erroneous warnings about duplicated runtime helpers ([#105](https://github.com/rollup/rollup-plugin-babel/issues/105))
-* Ignore `ignore` option in preflight check ([#102](https://github.com/rollup/rollup-plugin-babel/issues/102))
-* Allow custom `moduleName` with `runtime-helpers` ([#95](https://github.com/rollup/rollup-plugin-babel/issues/95))
+- Prevent erroneous warnings about duplicated runtime helpers ([#105](https://github.com/rollup/rollup-plugin-babel/issues/105))
+- Ignore `ignore` option in preflight check ([#102](https://github.com/rollup/rollup-plugin-babel/issues/102))
+- Allow custom `moduleName` with `runtime-helpers` ([#95](https://github.com/rollup/rollup-plugin-babel/issues/95))
 
 ## 2.7.0
 
-* Add `externalHelpersWhitelist` option ([#92](https://github.com/rollup/rollup-plugin-babel/pull/92))
-* Ignore `only` option during preflight checks ([#98](https://github.com/rollup/rollup-plugin-babel/issues/98))
-* Use `options.onwarn` if available ([#84](https://github.com/rollup/rollup-plugin-babel/issues/84))
-* Update documentation and dependencies
+- Add `externalHelpersWhitelist` option ([#92](https://github.com/rollup/rollup-plugin-babel/pull/92))
+- Ignore `only` option during preflight checks ([#98](https://github.com/rollup/rollup-plugin-babel/issues/98))
+- Use `options.onwarn` if available ([#84](https://github.com/rollup/rollup-plugin-babel/issues/84))
+- Update documentation and dependencies
 
 ## 2.6.1
 
-* Return a `name`
+- Return a `name`
 
 ## 2.6.0
 
-* Use `\0` convention for helper module ID ([#64](https://github.com/rollup/rollup-plugin-babel/issues/64))
+- Use `\0` convention for helper module ID ([#64](https://github.com/rollup/rollup-plugin-babel/issues/64))
 
 ## 2.5.1
 
-* Don't mutate `options.plugins` ([#47](https://github.com/rollup/rollup-plugin-babel/issues/47))
+- Don't mutate `options.plugins` ([#47](https://github.com/rollup/rollup-plugin-babel/issues/47))
 
 ## 2.5.0
 
-* Import `babelHelpers` rather than injecting them – allows `transform` function to be pure ([#rollup/658](https://github.com/rollup/rollup/pull/658#issuecomment-223876824))
+- Import `babelHelpers` rather than injecting them – allows `transform` function to be pure ([#rollup/658](https://github.com/rollup/rollup/pull/658#issuecomment-223876824))
 
 ## 2.4.0
 
-* Add `externalHelpers` option ([#41](https://github.com/rollup/rollup-plugin-babel/pull/41))
+- Add `externalHelpers` option ([#41](https://github.com/rollup/rollup-plugin-babel/pull/41))
 
 ## 2.3.9
 
-* Do not rename Babel helpers ([#34](https://github.com/rollup/rollup-plugin-babel/pull/34))
+- Do not rename Babel helpers ([#34](https://github.com/rollup/rollup-plugin-babel/pull/34))
 
 ## 2.3.8
 
-* Create new version to (hopefully) solve bizarre CI issue
+- Create new version to (hopefully) solve bizarre CI issue
 
 ## 2.3.7
 
-* Be less clever about renaming Babel helpers ([#19](https://github.com/rollup/rollup-plugin-babel/issues/19))
+- Be less clever about renaming Babel helpers ([#19](https://github.com/rollup/rollup-plugin-babel/issues/19))
 
 ## 2.3.6
 
-* Fix cache misses in preflight check ([#29](https://github.com/rollup/rollup-plugin-babel/pull/29))
+- Fix cache misses in preflight check ([#29](https://github.com/rollup/rollup-plugin-babel/pull/29))
 
 ## 2.3.5
 
-* Use class transformer local to plugin, not project being built
+- Use class transformer local to plugin, not project being built
 
 ## 2.3.4
 
-* Ensure class transformer is present for preflight check, and only run check once per directory ([#23](https://github.com/rollup/rollup-plugin-babel/issues/23))
+- Ensure class transformer is present for preflight check, and only run check once per directory ([#23](https://github.com/rollup/rollup-plugin-babel/issues/23))
 
 ## 2.3.3
 
-* Fix helper renaming ([#22](https://github.com/rollup/rollup-plugin-babel/issues/22))
+- Fix helper renaming ([#22](https://github.com/rollup/rollup-plugin-babel/issues/22))
 
 ## 2.3.1-2
 
-* Include correct files in npm package
+- Include correct files in npm package
 
 ## 2.3.0
 
-* Allow `transform-runtime` Babel plugin, if combined with `runtimeHelpers: true` option ([#17](https://github.com/rollup/rollup-plugin-babel/issues/17))
-* More permissive handling of helpers – only warn if inline helpers are duplicated
-* Handle plugins that change export patterns ([#18](https://github.com/rollup/rollup-plugin-babel/issues/18))
+- Allow `transform-runtime` Babel plugin, if combined with `runtimeHelpers: true` option ([#17](https://github.com/rollup/rollup-plugin-babel/issues/17))
+- More permissive handling of helpers – only warn if inline helpers are duplicated
+- Handle plugins that change export patterns ([#18](https://github.com/rollup/rollup-plugin-babel/issues/18))
 
 ## 2.2.0
 
-* Preflight checks are run per-file, to avoid configuration snafus ([#16](https://github.com/rollup/rollup-plugin-babel/issues/16))
+- Preflight checks are run per-file, to avoid configuration snafus ([#16](https://github.com/rollup/rollup-plugin-babel/issues/16))
 
 ## 2.1.0
 
-* Generate sourcemaps by default
+- Generate sourcemaps by default
 
 ## 2.0.1
 
-* Use object-assign ponyfill
-* Add travis support
-* Fix test
+- Use object-assign ponyfill
+- Add travis support
+- Fix test
 
 ## 2.0.0
 
-* Babel 6 compatible
+- Babel 6 compatible
 
 ## 1.0.0
 
-* First release
+- First release