92 lines
3.5 KiB
Markdown
92 lines
3.5 KiB
Markdown
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# import/no-unresolved
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Ensures an imported module can be resolved to a module on the local filesystem,
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as defined by standard Node `require.resolve` behavior.
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See [settings](../../README.md#settings) for customization options for the resolution (i.e.
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additional filetypes, `NODE_PATH`, etc.)
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This rule can also optionally report on unresolved modules in CommonJS `require('./foo')` calls and AMD `require(['./foo'], function (foo){...})` and `define(['./foo'], function (foo){...})`.
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To enable this, send `{ commonjs: true/false, amd: true/false }` as a rule option.
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Both are disabled by default.
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If you are using Webpack, see the section on [resolvers](../../README.md#resolvers).
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## Rule Details
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### Options
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By default, only ES6 imports will be resolved:
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```js
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/*eslint import/no-unresolved: 2*/
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import x from './foo' // reports if './foo' cannot be resolved on the filesystem
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```
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If `{commonjs: true}` is provided, single-argument `require` calls will be resolved:
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```js
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/*eslint import/no-unresolved: [2, { commonjs: true }]*/
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const { default: x } = require('./foo') // reported if './foo' is not found
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require(0) // ignored
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require(['x', 'y'], function (x, y) { /*...*/ }) // ignored
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```
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Similarly, if `{ amd: true }` is provided, dependency paths for `define` and `require`
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calls will be resolved:
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```js
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/*eslint import/no-unresolved: [2, { amd: true }]*/
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define(['./foo'], function (foo) { /*...*/ }) // reported if './foo' is not found
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require(['./foo'], function (foo) { /*...*/ }) // reported if './foo' is not found
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const { default: x } = require('./foo') // ignored
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```
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Both may be provided, too:
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```js
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/*eslint import/no-unresolved: [2, { commonjs: true, amd: true }]*/
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const { default: x } = require('./foo') // reported if './foo' is not found
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define(['./foo'], function (foo) { /*...*/ }) // reported if './foo' is not found
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require(['./foo'], function (foo) { /*...*/ }) // reported if './foo' is not found
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```
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#### `ignore`
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This rule has its own ignore list, separate from [`import/ignore`]. This is because you may want to know whether a module can be located, regardless of whether it can be parsed for exports: `node_modules`, CoffeeScript files, etc. are all good to resolve properly, but will not be parsed if configured as such via [`import/ignore`].
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To suppress errors from files that may not be properly resolved by your [resolver settings](../../README.md#resolver-plugins), you may add an `ignore` key with an array of `RegExp` pattern strings:
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```js
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/*eslint import/no-unresolved: [2, { ignore: ['\.img$'] }]*/
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import { x } from './mod' // may be reported, if not resolved to a module
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import coolImg from '../../img/coolImg.img' // will not be reported, even if not found
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```
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#### `caseSensitive`
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By default, this rule will report paths whose case do not match the underlying filesystem path, if the FS is not case-sensitive. To disable this behavior, set the `caseSensitive` option to `false`.
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```js
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/*eslint import/no-unresolved: [2, { caseSensitive: true (default) | false }]*/
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const { default: x } = require('./foo') // reported if './foo' is actually './Foo' and caseSensitive: true
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```
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## When Not To Use It
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If you're using a module bundler other than Node or Webpack, you may end up with
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a lot of false positive reports of missing dependencies.
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## Further Reading
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- [Resolver plugins](../../README.md#resolver-plugins)
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- [Node resolver](https://npmjs.com/package/eslint-import-resolver-node) (default)
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- [Webpack resolver](https://npmjs.com/package/eslint-import-resolver-webpack)
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- [`import/ignore`] global setting
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[`import/ignore`]: ../../README.md#importignore
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