Use new Babel presets

Fixes #1193, #1195.

Closes #947 and #1089, since babel-runtime is removed.

docs/recipes/babelrc.md

@@ -14,18 +14,18 @@ There are multiple options for configuring how AVA transpiles your tests using B
 
 ## AVA's default transpiler behavior
 
-By default, AVA transpiles your tests (and only your tests) using the [`es2015-node4`](https://github.com/jbach/babel-preset-es2015-node4) on Node.js 4 or [`node6`](https://github.com/salakar/babel-preset-node6) on Node.js 6 and higher, and [`stage-2`](http://babeljs.io/docs/plugins/preset-stage-2/) Babel presets. This is a great option for small modules where you do not desire a build step to transpile your source before deploying to `npm`.
+By default, AVA transpiles your tests and helper files using the [`@ava/stage-4`](https://github.com/avajs/babel-preset-stage-4) Babel preset. This is a great option for small modules where you do not desire a build step to transpile your source before deploying to `npm`.
 
 ## Customizing how AVA transpiles your tests
 
-You can override the default Babel configuration AVA uses for test transpilation in `package.json`. For example, the configuration below adds the Babel `rewire` plugin, and opts to only use the Babel [`stage-3`](http://babeljs.io/docs/plugins/preset-stage-3/) preset (which is a subset of [`stage-2`](http://babeljs.io/docs/plugins/preset-stage-2/)).
+You can override the default Babel configuration AVA uses for test transpilation in `package.json`. For example, the configuration below adds the Babel `rewire` plugin, and adds the Babel [`stage-3`](http://babeljs.io/docs/plugins/preset-stage-3/) preset.
 
 ```json
 {
   "ava": {
     "babel": {
       "plugins": ["rewire"],
-      "presets": ["es2015-node4", "stage-3"]
+      "presets": ["@ava/stage-4", "stage-3"]
     }
   }
 }
@@ -43,7 +43,7 @@ To transpile your sources, you will need to define a [`babel config` ](http://ba
     "require": ["babel-register"]
   },
   "babel": {
-    "presets": ["es2015-node4"]
+    "presets": ["@ava/stage-4"]
   }
 }
 ```
@@ -63,12 +63,12 @@ Using the `"inherit"` shortcut will cause your tests to be transpiled the same a
     "babel": "inherit"
   },
   "babel": {
-    "presets": ["es2015-node4", "react"]
+    "presets": ["@ava/stage-4", "react"]
   }
 }
 ```
 
-In the above example, both tests and sources will be transpiled using the [`es2015-node4`](https://github.com/jbach/babel-preset-es2015-node4) and [`react`](http://babeljs.io/docs/plugins/preset-react/) presets.
+In the above example, both tests and sources will be transpiled using the [`@ava/stage-4`](https://github.com/avajs/babel-preset-stage-4) and [`react`](http://babeljs.io/docs/plugins/preset-react/) presets.
 
 ## Extend your source transpilation configuration
 
@@ -87,12 +87,12 @@ When specifying the Babel config for your tests, you can set the `babelrc` optio
     }
   },
   "babel": {
-    "presets": ["es2015-node4", "react"]
+    "presets": ["@ava/stage-4", "react"]
   }
 }
 ```
 
-In the above example, *sources* are compiled use [`es2015-node4`](https://github.com/jbach/babel-preset-es2015-node4) and [`react`](http://babeljs.io/docs/plugins/preset-react/), *tests* use those same plugins, plus the additional `custom` plugins specified.
+In the above example, *sources* are compiled use [`@ava/stage-4`](https://github.com/avajs/babel-preset-stage-4) and [`react`](http://babeljs.io/docs/plugins/preset-react/), *tests* use those same plugins, plus the additional `custom` plugins specified.
 
 ## Extend an alternate config file.
 

lib/babel-config.js

@@ -3,7 +3,6 @@ const path = require('path');
 const chalk = require('chalk');
 const figures = require('figures');
 const convertSourceMap = require('convert-source-map');
-const semver = require('semver');
 const colors = require('./colors');
 
 function validate(conf) {
@@ -25,68 +24,26 @@ function validate(conf) {
 	return conf;
 }
 
-function lazy(initFn) {
-	let initialized = false;
-	let value;
+function lazy(buildPreset) {
+	let preset;
 
-	return () => {
-		if (!initialized) {
-			initialized = true;
-			value = initFn();
+	return babel => {
+		if (!preset) {
+			preset = buildPreset(babel);
 		}
 
-		return value;
+		return preset;
 	};
 }
 
-const defaultPresets = lazy(() => {
-	const esPreset = semver.satisfies(process.version, '>=6') ?
-		'babel-preset-node6' :
-		'babel-preset-es2015-node4';
+const stage4 = lazy(() => require('@ava/babel-preset-stage-4')());
 
-	return [
-		require('babel-preset-stage-2'),
-		require(esPreset) // eslint-disable-line import/no-dynamic-require
-	];
-});
-
-const rewritePlugin = lazy(() => {
-	const wrapListener = require('babel-plugin-detective/wrap-listener');
-
-	return wrapListener(rewriteBabelRuntimePaths, 'rewrite-runtime', {
-		generated: true,
-		require: true,
-		import: true
+function makeTransformTestFiles(powerAssert) {
+	return lazy(babel => {
+		return require('@ava/babel-preset-transform-test-files')(babel, {powerAssert});
 	});
-});
-
-function rewriteBabelRuntimePaths(path) {
-	const isBabelPath = /^babel-runtime[\\/]?/.test(path.node.value);
-
-	if (path.isLiteral() && isBabelPath) {
-		path.node.value = require.resolve(path.node.value);
-	}
 }
 
-const espowerPlugin = lazy(() => {
-	const babel = require('babel-core');
-	const createEspowerPlugin = require('babel-plugin-espower/create');
-
-	// Initialize power-assert
-	return createEspowerPlugin(babel, {
-		embedAst: true,
-		patterns: require('./enhance-assert').PATTERNS
-	});
-});
-
-const defaultPlugins = lazy(() => {
-	return [
-		require('babel-plugin-ava-throws-helper'),
-		rewritePlugin(),
-		require('babel-plugin-transform-runtime')
-	];
-});
-
 function build(babelConfig, powerAssert, filePath, code) {
 	babelConfig = validate(babelConfig);
 
@@ -95,7 +52,7 @@ function build(babelConfig, powerAssert, filePath, code) {
 	if (babelConfig === 'default') {
 		options = {
 			babelrc: false,
-			presets: defaultPresets()
+			presets: [stage4]
 		};
 	} else if (babelConfig === 'inherit') {
 		options = {
@@ -118,9 +75,10 @@ function build(babelConfig, powerAssert, filePath, code) {
 		ast: false
 	});
 
-	options.plugins = (options.plugins || [])
-		.concat(powerAssert ? espowerPlugin() : [])
-		.concat(defaultPlugins());
+	if (!options.presets) {
+		options.presets = [];
+	}
+	options.presets.push(makeTransformTestFiles(powerAssert));
 
 	return options;
 }
@@ -143,8 +101,8 @@ function getSourceMap(filePath, code) {
 module.exports = {
 	validate,
 	build,
-	pluginPackages: [
-		require.resolve('babel-core/package.json'),
-		require.resolve('babel-plugin-espower/package.json')
+	presetHashes: [
+		require('@ava/babel-preset-stage-4/package-hash'),
+		require('@ava/babel-preset-transform-test-files/package-hash')
 	]
 };

lib/caching-precompiler.js

@@ -53,13 +53,15 @@ class CachingPrecompiler {
 		return `${result.code}\n${comment}`;
 	}
 	_createTransform() {
-		const pluginPackages = babelConfigHelper.pluginPackages;
-		const avaPackage = require.resolve('../package.json');
-		const packages = [avaPackage].concat(pluginPackages);
-		const majorNodeVersion = process.version.split('.')[0];
-		const babelConfig = JSON.stringify(this.babelConfig);
-		const packageSalt = babelConfig + majorNodeVersion + this.powerAssert;
-		const salt = packageHash.sync(packages, packageSalt);
+		const salt = packageHash.sync([
+			require.resolve('../package.json'),
+			require.resolve('babel-core/package.json')
+		], {
+			babelConfig: this.babelConfig,
+			majorNodeVersion: process.version.split('.')[0],
+			powerAssert: this.powerAssert,
+			presetHashes: babelConfigHelper.presetHashes
+		});
 
 		return cachingTransform({
 			factory: this._init,

lib/enhance-assert.js

@@ -3,6 +3,9 @@
 module.exports = enhanceAssert;
 module.exports.formatter = formatter;
 
+// When adding patterns, don't forget to add to
+// https://github.com/avajs/babel-preset-transform-test-files/blob/master/espower-patterns.json
+// Then release a new version of that preset and bump the SemVer range here.
 module.exports.PATTERNS = [
 	't.truthy(value, [message])',
 	't.falsy(value, [message])',

package.json

@@ -87,6 +87,8 @@
     "observables"
   ],
   "dependencies": {
+    "@ava/babel-preset-stage-4": "^1.0.0",
+    "@ava/babel-preset-transform-test-files": "^1.0.0",
     "arr-flatten": "^1.0.1",
     "array-union": "^1.0.1",
     "array-uniq": "^1.0.2",
@@ -95,14 +97,6 @@
     "ava-init": "^0.2.0",
     "babel-code-frame": "^6.16.0",
     "babel-core": "^6.17.0",
-    "babel-plugin-ava-throws-helper": "^0.1.0",
-    "babel-plugin-detective": "^2.0.0",
-    "babel-plugin-espower": "^2.3.1",
-    "babel-plugin-transform-runtime": "^6.15.0",
-    "babel-preset-es2015-node4": "^2.1.0",
-    "babel-preset-node6": "^11.0.0",
-    "babel-preset-stage-2": "^6.17.0",
-    "babel-runtime": "^6.11.6",
     "bluebird": "^3.0.0",
     "caching-transform": "^1.0.0",
     "chalk": "^1.0.0",
@@ -147,7 +141,7 @@
     "multimatch": "^2.1.0",
     "observable-to-promise": "^0.4.0",
     "option-chain": "^0.1.0",
-    "package-hash": "^1.1.0",
+    "package-hash": "^1.2.0",
     "pkg-conf": "^2.0.0",
     "plur": "^2.0.0",
     "power-assert-context-formatter": "^1.0.4",
@@ -157,7 +151,6 @@
     "repeating": "^2.0.0",
     "require-precompiled": "^0.1.0",
     "resolve-cwd": "^1.0.0",
-    "semver": "^5.3.0",
     "slash": "^1.0.0",
     "source-map-support": "^0.4.0",
     "stack-utils": "^0.4.0",

readme.md

@@ -40,7 +40,7 @@ Translations: [Español](https://github.com/avajs/ava-docs/blob/master/es_ES/rea
 - Enforces writing atomic tests
 - No implicit globals
 - [Isolated environment for each test file](#process-isolation)
-- [Write your tests in ES2015](#es2015-support)
+- [Write your tests in ES2017](#es2017-support)
 - [Promise support](#promise-support)
 - [Generator function support](#generator-function-support)
 - [Async function support](#async-function-support)
@@ -266,7 +266,7 @@ All of the CLI options can be configured in the `ava` section of your `package.j
 
 Arguments passed to the CLI will always take precedence over the configuration in `package.json`.
 
-See the [ES2015 support](#es2015-support) section for details on the `babel` option.
+See the [ES2017 support](#es2017-support) section for details on the `babel` option.
 
 ## Documentation
 
@@ -671,21 +671,17 @@ test(t => {
 });
 ```
 
-### ES2015 support
+### ES2017 support
 
-AVA comes with built-in support for ES2015 through [Babel 6](https://babeljs.io). Just write your tests in ES2015. No extra setup needed. You can use any Babel version in your project. We use our own bundled Babel with the [`es2015`](https://babeljs.io/docs/plugins/preset-es2015/) and [`stage-2`](https://babeljs.io/docs/plugins/preset-stage-2/) presets, as well as the [`espower`](https://github.com/power-assert-js/babel-plugin-espower) and [`transform-runtime`](https://babeljs.io/docs/plugins/transform-runtime/) plugins.
+AVA comes with built-in support for ES2017 through [Babel 6](https://babeljs.io). Just write your tests in ES2017. No extra setup needed. You can use any Babel version in your project. We use our own bundled Babel with our [`@ava/stage-4`](https://github.com/avajs/babel-preset-stage-4) and [`stage-2`](https://babeljs.io/docs/plugins/preset-stage-2/) preset, as well as [custom transforms](https://github.com/avajs/babel-preset-transform-test-files) for test and helper files.
 
 The corresponding Babel config for AVA's setup is as follows:
 
 ```json
 {
   "presets": [
-    "es2015",
-    "stage-2"
-  ],
-  "plugins": [
-    "espower",
-    "transform-runtime"
+    "@ava/stage-4",
+    "@ava/transform-test-files"
   ]
 }
 ```

test/api.js

@@ -693,11 +693,11 @@ function generateTests(prefix, apiCreator) {
 	});
 
 	test(`${prefix} power-assert support`, t => {
-		t.plan(4);
+		t.plan(3);
 
 		const api = apiCreator({
 			babelConfig: {
-				presets: ['react', 'es2015-node4', 'stage-2']
+				presets: ['react', '@ava/stage-4']
 			}
 		});
 
@@ -715,11 +715,6 @@ function generateTests(prefix, apiCreator) {
 
 				t.match(
 					result.errors[2].error.message,
-					/t\.true\(o === \{ ...o \}\)\s*\n\s+\|\s*\n\s+Object\{\}/m
-				);
-
-				t.match(
-					result.errors[3].error.message,
 					/t\.true\(<div \/> === <span \/>\)/m
 				);
 			});
@@ -878,7 +873,7 @@ function generateTests(prefix, apiCreator) {
 
 		const api = apiCreator({
 			babelConfig: {
-				presets: ['es2015-node4', 'stage-2'],
+				presets: ['@ava/stage-4'],
 				plugins: [testCapitalizerPlugin]
 			},
 			cacheEnabled: false