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core-js@3
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| { | ||
| // use transforms which does not use ES5+ builtins | ||
| plugins: [ | ||
| ['transform-es3-member-expression-literals'], | ||
| ['transform-es3-property-literals'], | ||
| // use it instead of webpack es modules for support engines without descriptors | ||
| ['transform-es2015-modules-commonjs', { loose: true }], | ||
| ['transform-es2015-arrow-functions'], | ||
| ['transform-es2015-block-scoped-functions'], | ||
| ['transform-es2015-block-scoping'], | ||
| ['transform-es2015-classes', { loose: true }], | ||
| ['transform-es2015-computed-properties', { loose: true }], | ||
| ['transform-es2015-destructuring', { loose: true }], | ||
| ['transform-es2015-literals'], | ||
| ['transform-es2015-parameters'], | ||
| ['transform-es2015-shorthand-properties'], | ||
| ['transform-es2015-spread', { loose: true }], | ||
| ['transform-es2015-template-literals', { loose: true, spec: true }], | ||
| ['transform-exponentiation-operator'], | ||
| ['transform-for-of-as-array'], | ||
| ['check-es2015-constants'] | ||
| ] | ||
| } |
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| node_modules/** | ||
| build/index.js | ||
| client/** | ||
| tests/** | ||
| node_modules/ | ||
| /packages/core-js-bundle/ | ||
| /packages/core-js-pure/override/ | ||
| /tests/bundles/ | ||
| !**/.eslintrc.js |
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| language: node_js | ||
| node_js: | ||
| - '10' | ||
| - '8' | ||
| - '6' | ||
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| 'use strict'; | ||
| const resolve = require('path').resolve; | ||
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| module.exports = { | ||
| options: { | ||
| mode: 'none', | ||
| module: { | ||
| rules: [{ | ||
| test: /\.js$/, | ||
| exclude: /modules/, | ||
| use: { | ||
| loader: 'babel-loader', | ||
| }, | ||
| }], | ||
| }, | ||
| resolve: { | ||
| alias: { | ||
| 'core-js': resolve(__dirname, './packages/core-js'), | ||
| 'core-js-pure': resolve(__dirname, './packages/core-js-pure'), | ||
| }, | ||
| }, | ||
| node: { | ||
| global: false, | ||
| process: false, | ||
| setImmediate: false, | ||
| }, | ||
| stats: false, | ||
| output: { | ||
| path: resolve(__dirname, './tests/bundles'), | ||
| }, | ||
| }, | ||
| helpers: { | ||
| entry: './tests/helpers/qunit-helpers.js', | ||
| output: { filename: 'qunit-helpers.js' }, | ||
| }, | ||
| pure: { | ||
| entry: './tests/pure/index.js', | ||
| output: { filename: 'pure.js' }, | ||
| }, | ||
| tests: { | ||
| entry: './tests/tests/index.js', | ||
| output: { filename: 'tests.js' }, | ||
| }, | ||
| 'promises-aplus-tests': { | ||
| entry: 'promises-aplus-tests/lib/testFiles.js', | ||
| output: { filename: 'promises-aplus.js' }, | ||
| }, | ||
| }; |
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| # Contributing | ||
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| Contributions are always welcome. If you don't know what how you can help, you can check [issues](https://github.com/zloirock/core-js/issues) or ask @zloirock. | ||
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| ## How to add a new polyfill | ||
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| - The polyfill implementation should be added to the [`packages/core-js/modules`](./packages/core-js/modules) directory. | ||
| - If the implementation for the `pure` version should differ from the global version, it should be added to [`packages/core-js-pure/modules-pure`](./packages/core-js-pure/modules-pure) directory. The rest of `core-js-pure` will be copied from `core-js` package. | ||
| - For export the polyfill, in almost all cases should be used `_export` helper. | ||
| - The polyfill should be added to the [list of polyfills](./packages/core-js-builder/config.js) and to entry points, where it's required: [`packages/core-js/index.js`](./packages/core-js/index.js), directories [`packages/core-js/features`](./packages/core-js/features), [`packages/core-js/es`](./packages/core-js/es), [`packages/core-js/esnext`](./packages/core-js/esnext) and [`packages/core-js/web`](./packages/core-js/web). | ||
| - Unit tests for the polyfill should be added to [`tests/tests`](./tests/tests) and [`tests/pure`](./tests/pure). | ||
| - All new entry points should be added to [the test of entry points](./tests/commonjs). | ||
| - Add it to [README.md](./README.md). | ||
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| ## Style and standards | ||
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| Coding style should follow our [`.eslintrc`](./.eslintrc.js). You can test it by calling [`npm run eslint`](#testing). Different places have different syntax and standard library limitations: | ||
| - Polyfill implementations should use only ES3 syntax and standard library. Polyfills should not use another polyfill from the global namespace. | ||
| - In unit tests should be used modern syntax with our [minimalistic Babel config](./.babelrc). Unit tests for the `pure` version should not use any modern standard library features. | ||
| - In building tools and tests, performed in Node.js, should be used only available in Node.js 4 syntax and standard library. | ||
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| File names should be in kebab-case. Name of files with polyfills should follow naming convention `namespace.subnamespase-where-required.feature-name`, for example, `esnext.promise.try`. Top level namespace could be `es` for stable ECMAScript features, `esnext` for ECMAScript proposals, `web` for another web standards and `core` for helpers. Internal `core-js` modules should use `_` prefix. | ||
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| ## Testing | ||
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| Before testing, you should install dependencies: | ||
| ``` | ||
| $ npm i | ||
| ``` | ||
| You can run all tests by | ||
| ``` | ||
| $ npm run test | ||
| ``` | ||
| You can run parts of the test case separately: | ||
| - Linting: | ||
| ``` | ||
| $ npm run lint | ||
| ``` | ||
| - Global version unit tests: | ||
| ``` | ||
| $ npm run unit-tests | ||
| ``` | ||
| - `pure` version unit tests: | ||
| ``` | ||
| $ npm run unit-tests-pure | ||
| ``` | ||
| - [Promises/A+ test case](https://github.com/promises-aplus/promises-tests): | ||
| ``` | ||
| $ npm run promises-tests | ||
| ``` | ||
| - [ECMAScript `Observable` test case](https://github.com/tc39/proposal-observable): | ||
| ``` | ||
| $ npm run observables-tests | ||
| ``` | ||
| - CommonJS entry points tests: | ||
| ``` | ||
| $ npm run commonjs-tests | ||
| ``` | ||
| If you want to run tests in a certain browser at first you should build packages and test bundles: | ||
| ``` | ||
| $ npm run build | ||
| ``` | ||
| - For running global version unit test case use this file: | ||
| ``` | ||
| tests/tests.html | ||
| ``` | ||
| - For running the `pure` version unit test case use this file: | ||
| ``` | ||
| tests/pure.html | ||
| ``` | ||
| - Before running [Promises/A+ test case](https://github.com/promises-aplus/promises-tests) in the browser you should bundle it: | ||
| ``` | ||
| $ npm run bundle-promises-tests | ||
| ``` | ||
| and after that use this file: | ||
| ``` | ||
| tests/promises-aplus.html | ||
| ``` |
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