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