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96 lines
2.1 KiB
Markdown
96 lines
2.1 KiB
Markdown
# import/no-commonjs
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Reports `require([string])` function calls. Will not report if >1 argument,
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or single argument is not a literal string.
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Reports `module.exports` or `exports.*`, also.
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Intended for temporary use when migrating to pure ES6 modules.
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## Rule Details
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This will be reported:
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```js
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var mod = require('./mod')
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, common = require('./common')
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, fs = require('fs')
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, whateverModule = require('./not-found')
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module.exports = { a: "b" }
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exports.c = "d"
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```
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### Allow require
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If `allowRequire` option is set to `true`, `require` calls are valid:
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```js
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/*eslint no-commonjs: [2, { allowRequire: true }]*/
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var mod = require('./mod');
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```
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but `module.exports` is reported as usual.
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### Allow conditional require
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By default, conditional requires are allowed:
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```js
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var a = b && require("c")
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if (typeof window !== "undefined") {
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require('that-ugly-thing');
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}
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var fs = null;
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try {
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fs = require("fs")
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} catch (error) {}
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```
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If the `allowConditionalRequire` option is set to `false`, they will be reported.
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If you don't rely on synchronous module loading, check out [dynamic import](https://github.com/airbnb/babel-plugin-dynamic-import-node).
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### Allow primitive modules
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If `allowPrimitiveModules` option is set to `true`, the following is valid:
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```js
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/*eslint no-commonjs: [2, { allowPrimitiveModules: true }]*/
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module.exports = "foo"
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module.exports = function rule(context) { return { /* ... */ } }
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```
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but this is still reported:
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```js
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/*eslint no-commonjs: [2, { allowPrimitiveModules: true }]*/
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module.exports = { x: "y" }
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exports.z = function boop() { /* ... */ }
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```
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This is useful for things like ESLint rule modules, which must export a function as
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the module.
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## When Not To Use It
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If you don't mind mixing module systems (sometimes this is useful), you probably
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don't want this rule.
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It is also fairly noisy if you have a larger codebase that is being transitioned
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from CommonJS to ES6 modules.
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## Contributors
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Special thanks to @xjamundx for donating the module.exports and exports.* bits.
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## Further Reading
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- [`no-amd`](./no-amd.md): report on AMD `require`, `define`
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- Source: https://github.com/xjamundx/eslint-plugin-modules
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