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import/no-unresolved

💼 This rule is enabled in the following configs: ❗ errors, ☑️ recommended.

Ensures an imported module can be resolved to a module on the local filesystem, as defined by standard Node require.resolve behavior.

See settings for customization options for the resolution (i.e. additional filetypes, NODE_PATH, etc.)

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) {...}).

To enable this, send { commonjs: true/false, amd: true/false } as a rule option. Both are disabled by default.

If you are using Webpack, see the section on resolvers.

Rule Details

Options

By default, only ES6 imports will be resolved:

/*eslint import/no-unresolved: 2*/
import x from './foo' // reports if './foo' cannot be resolved on the filesystem

If {commonjs: true} is provided, single-argument require calls will be resolved:

/*eslint import/no-unresolved: [2, { commonjs: true }]*/
const { default: x } = require('./foo') // reported if './foo' is not found

require(0) // ignored
require(['x', 'y'], function (x, y) { /*...*/ }) // ignored

Similarly, if { amd: true } is provided, dependency paths for define and require calls will be resolved:

/*eslint import/no-unresolved: [2, { amd: true }]*/
define(['./foo'], function (foo) { /*...*/ }) // reported if './foo' is not found
require(['./foo'], function (foo) { /*...*/ }) // reported if './foo' is not found

const { default: x } = require('./foo') // ignored

Both may be provided, too:

/*eslint import/no-unresolved: [2, { commonjs: true, amd: true }]*/
const { default: x } = require('./foo') // reported if './foo' is not found
define(['./foo'], function (foo) { /*...*/ }) // reported if './foo' is not found
require(['./foo'], function (foo) { /*...*/ }) // reported if './foo' is not found

ignore

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.

To suppress errors from files that may not be properly resolved by your resolver settings, you may add an ignore key with an array of RegExp pattern strings:

/*eslint import/no-unresolved: [2, { ignore: ['\\.img$'] }]*/

import { x } from './mod' // may be reported, if not resolved to a module

import coolImg from '../../img/coolImg.img' // will not be reported, even if not found

caseSensitive

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.

/*eslint import/no-unresolved: [2, { caseSensitive: true (default) | false }]*/
const { default: x } = require('./foo') // reported if './foo' is actually './Foo' and caseSensitive: true

caseSensitiveStrict

The caseSensitive option does not detect case for the current working directory. The caseSensitiveStrict option allows checking cwd in resolved path. By default, the option is disabled.

/*eslint import/no-unresolved: [2, { caseSensitiveStrict: true }]*/

// Absolute paths
import Foo from `/Users/fOo/bar/file.js` // reported, /Users/foo/bar/file.js
import Foo from `d:/fOo/bar/file.js` // reported, d:/foo/bar/file.js

// Relative paths, cwd is Users/foo/
import Foo from `./../fOo/bar/file.js` // reported

When Not To Use It

If you're using a module bundler other than Node or Webpack, you may end up with a lot of false positive reports of missing dependencies.

Further Reading