108 lines
2.8 KiB
Markdown
108 lines
2.8 KiB
Markdown
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# import/no-unused-modules
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Reports:
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- modules without any exports
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- individual exports not being statically `import`ed or `require`ed from other modules in the same project
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- dynamic imports are supported if argument is a literal string
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## Rule Details
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### Usage
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In order for this plugin to work, one of the options `missingExports` or `unusedExports` must be enabled (see "Options" section below). In the future, these options will be enabled by default (see https://github.com/import-js/eslint-plugin-import/issues/1324)
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Example:
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```
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"rules: {
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...otherRules,
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"import/no-unused-modules": [1, {"unusedExports": true}]
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}
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```
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### Options
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This rule takes the following option:
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- **`missingExports`**: if `true`, files without any exports are reported (defaults to `false`)
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- **`unusedExports`**: if `true`, exports without any static usage within other modules are reported (defaults to `false`)
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- `src`: an array with files/paths to be analyzed. It only applies to unused exports. Defaults to `process.cwd()`, if not provided
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- `ignoreExports`: an array with files/paths for which unused exports will not be reported (e.g module entry points in a published package)
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### Example for missing exports
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#### The following will be reported
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```js
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const class MyClass { /*...*/ }
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function makeClass() { return new MyClass(...arguments) }
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```
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#### The following will not be reported
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```js
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export default function () { /*...*/ }
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```
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```js
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export const foo = function () { /*...*/ }
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```
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```js
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export { foo, bar }
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```
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```js
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export { foo as bar }
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```
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### Example for unused exports
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given file-f:
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```js
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import { e } from 'file-a'
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import { f } from 'file-b'
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import * as fileC from 'file-c'
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export { default, i0 } from 'file-d' // both will be reported
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export const j = 99 // will be reported
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```
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and file-d:
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```js
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export const i0 = 9 // will not be reported
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export const i1 = 9 // will be reported
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export default () => {} // will not be reported
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```
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and file-c:
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```js
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export const h = 8 // will not be reported
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export default () => {} // will be reported, as export * only considers named exports and ignores default exports
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```
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and file-b:
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```js
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import two, { b, c, doAnything } from 'file-a'
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export const f = 6 // will not be reported
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```
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and file-a:
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```js
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const b = 2
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const c = 3
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const d = 4
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export const a = 1 // will be reported
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export { b, c } // will not be reported
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export { d as e } // will not be reported
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export function doAnything() {
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// some code
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} // will not be reported
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export default 5 // will not be reported
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```
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#### Important Note
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Exports from files listed as a main file (`main`, `browser`, or `bin` fields in `package.json`) will be ignored by default. This only applies if the `package.json` is not set to `private: true`
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## When not to use
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If you don't mind having unused files or dead code within your codebase, you can disable this rule
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