|
1 |
| -# lib.shims |
2 |
| - |
3 |
| -- **Type:** |
4 |
| - |
5 |
| - ```ts |
6 |
| - type Shims = { |
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| - cjs?: { |
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| - 'import.meta.url'?: boolean; |
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| - }; |
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| - esm?: { |
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| - __filename?: boolean; |
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| - __dirname?: boolean; |
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| - require?: boolean; |
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| - }; |
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| - }; |
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| - ``` |
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| - |
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| -- **Default:** |
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| - |
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| - ```js |
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| - { |
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| - cjs: { |
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| - 'import.meta.url': true, |
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| - }, |
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| - esm: { |
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| - __filename: false, |
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| - __dirname: false, |
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| - require: false, |
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| - }, |
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| - } |
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| - ``` |
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| - |
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| -Used to configure the shims for CommonJS and ESM output. |
34 |
| - |
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| -## shims.cjs |
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| - |
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| -Set the fields to `true` to enable the corresponding shims for CommonJS output. |
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| - |
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| -### shims.cjs['import.meta.url'] |
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| - |
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| -- **Default:** `true` |
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| - |
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| -Options: |
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| - |
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| -- `true`: when `format` is `cjs`, the `import.meta.url` in source code will be replaced with the URL of the current module. |
46 |
| - |
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| - For example, given the following source code: |
48 |
| - |
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| - ```js |
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| - import { readFileSync } from 'fs'; |
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| - const buffer = readFileSync(new URL('./data.proto', import.meta.url)); |
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| - ``` |
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| -
|
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| - the CJS output will be transformed to: |
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| -
|
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| - ```js |
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| - const { readFileSync } = require('fs'); |
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| - const buffer = readFileSync( |
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| - new URL( |
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| - './data.proto', |
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| - /*#__PURE__*/ (function () { |
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| - return typeof document === 'undefined' |
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| - ? new (module.require('url'.replace('', '')).URL)( |
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| - 'file:' + __filename, |
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| - ).href |
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| - : (document.currentScript && document.currentScript.src) || |
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| - new URL('main.js', document.baseURI).href; |
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| - })(), |
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| - ), |
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| - ); |
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| - ``` |
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| -
|
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| -- `false`: the `import.meta.url` will be leave as is, which will cause a runtime error when running the output. |
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| -
|
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| -## shims.esm |
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| -
|
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| -Set the fields to `true` to enable the corresponding shims for ESM output. |
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| -
|
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| -### shims.esm.\_\_filename |
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| -
|
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| -Whether to shim the global `__filename` of CommonJS in ESM output. |
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| -
|
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| -- **Default:** `false` |
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| -
|
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| -Options: |
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| -
|
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| -- `true`: when `format` is `esm`, the `__filename` in source code will be replaced with the filename of the current module. |
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| -
|
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| - For example, given the following source code: |
| 1 | +--- |
| 2 | +overviewHeaders: [2, 3] |
| 3 | +--- |
90 | 4 |
|
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| - ```js |
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| - console.log(__filename); |
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| - ``` |
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| -
|
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| - the ESM output will be transformed to: |
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| -
|
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| - ```js |
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| - import { fileURLToPath as __webpack_fileURLToPath__ } from 'url'; |
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| - import { dirname as __webpack_dirname__ } from 'path'; |
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| - var src_dirname = __webpack_dirname__( |
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| - __webpack_fileURLToPath__(import.meta.url), |
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| - ); |
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| - var src_filename = __webpack_fileURLToPath__(import.meta.url); |
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| - console.log(src_filename); |
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| - ``` |
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| -
|
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| -- `false`: the `__filename` will be leave as is, which will cause a runtime error when running the output. |
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| -
|
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| -### shims.esm.\_\_dirname |
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| -
|
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| -Whether to shim the global `__dirname` of CommonJS in ESM output. |
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| -
|
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| -- **Default:** `false` |
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| -
|
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| -Options: |
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| -
|
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| -- `true`: when `format` is `esm`, the `__dirname` in source code will be replaced with the directory name of the current module. |
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| -
|
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| - For example, given the following source code: |
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| -
|
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| - ```js |
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| - console.log(__dirname); |
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| - ``` |
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| -
|
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| - the ESM output will be transformed to: |
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| -
|
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| - ```js |
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| - import { fileURLToPath as __webpack_fileURLToPath__ } from 'url'; |
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| - import { dirname as __webpack_dirname__ } from 'path'; |
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| - var src_dirname = __webpack_dirname__( |
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| - __webpack_fileURLToPath__(import.meta.url), |
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| - ); |
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| - console.log(src_dirname); |
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| - ``` |
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| -
|
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| -- `false`: the `__dirname` will be leave as is, which will cause a runtime error when running the output. |
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| -
|
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| -### shims.esm.require |
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| -
|
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| -Whether to shim the global `require` of CommonJS in ESM output. |
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| -
|
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| -- **Default:** `false` |
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| -
|
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| -Options: |
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| -
|
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| -- `true`: when `format` is `esm`, there will be a `require` that created by `createRequire` at the beginning of the output which can be accessed in source code like the global `require` like CommonJS. |
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| -
|
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| - For example, given the following source code: |
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| -
|
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| - ```js |
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| - const someModule = require('./someModule'); |
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| - |
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| - // dynamic require |
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| - const dynamicRequiredModule = require(SOME_VALUE_IN_RUNTIME); |
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| - // require.resolve |
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| - const someModulePath = require.resolve('./someModule'); |
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| - // use require as a expression |
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| - const lazyFn = (module, requireFn) => {}; |
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| - lazyFn('./other.js', require); |
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| - ``` |
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| -
|
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| - the ESM output will be transformed to: |
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| -
|
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| - ```js |
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| - import __rslib_shim_module__ from 'module'; |
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| - const require = /*#__PURE__*/ __rslib_shim_module__.createRequire( |
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| - import.meta.url, |
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| - ); |
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| - // dynamic require |
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| - require(SOME_VALUE_IN_RUNTIME); |
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| - // require.resolve |
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| - require.resolve('./someModule'); |
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| - // use require as a expression |
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| - const lazyFn = (module, requireFn) => {}; |
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| - lazyFn('./other.js', require); |
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| - ``` |
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| -
|
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| -- `false`: the `require` will be leave as is, which will cause a runtime error when running the output. |
| 5 | +# lib.shims |
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