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76 lines
2.2 KiB
Markdown
76 lines
2.2 KiB
Markdown
# import/first
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🔧 This rule is automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix).
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<!-- end auto-generated rule header -->
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This rule reports any imports that come after non-import
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statements.
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## Rule Details
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```js
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import foo from './foo'
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// some module-level initializer
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initWith(foo)
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import bar from './bar' // <- reported
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```
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Providing `absolute-first` as an option will report any absolute imports (i.e.
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packages) that come after any relative imports:
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```js
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import foo from 'foo'
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import bar from './bar'
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import * as _ from 'lodash' // <- reported
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```
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If you really want import type ordering, check out [`import/order`].
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Notably, `import`s are hoisted, which means the imported modules will be evaluated
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before any of the statements interspersed between them. Keeping all `import`s together
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at the top of the file may prevent surprises resulting from this part of the spec.
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### On directives
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Directives are allowed as long as they occur strictly before any `import` declarations,
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as follows:
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```js
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'use super-mega-strict'
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import { suchFoo } from 'lame-fake-module-name' // no report here
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```
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A directive in this case is assumed to be a single statement that contains only
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a literal string-valued expression.
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`'use strict'` would be a good example, except that [modules are always in strict
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mode](https://262.ecma-international.org/6.0/#sec-strict-mode-code) so it would be surprising to see a `'use strict'` sharing a file with `import`s and
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`export`s.
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Given that, see [#255] for the reasoning.
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### With Fixer
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This rule contains a fixer to reorder in-body import to top, the following criteria applied:
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1. Never re-order relative to each other, even if `absolute-first` is set.
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2. If an import creates an identifier, and that identifier is referenced at module level *before* the import itself, that won't be re-ordered.
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## When Not To Use It
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If you don't mind imports being sprinkled throughout, you may not want to
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enable this rule.
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## Further Reading
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- [`import/order`]: a major step up from `absolute-first`
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- Issue [#255]
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[`import/order`]: ./order.md
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[#255]: https://github.com/import-js/eslint-plugin-import/issues/255
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