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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| # Forbid unassigned imports | ||
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| With both CommonJS' `require` and the ES6 modules' `import` syntax, it is possible to import a module but not to use its result. This can be done explicitly by not assigning the module to as variable. Doing so can mean either of the following things: | ||
| - The module is imported but not used | ||
| - The module has side-effects (like [`should`](https://www.npmjs.com/package/should)). Having side-effects, makes it hard to know whether the module is actually used or can be removed. It can also make it harder to test or mock parts of your application. | ||
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| This rule aims to remove modules with side-effects by reporting when a module is imported but not assigned. | ||
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| ## Fail | ||
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| ```js | ||
| import 'should' | ||
| require('should') | ||
| ``` | ||
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| ## Pass | ||
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| ```js | ||
| import _ from 'foo' | ||
| import _, {foo} from 'foo' | ||
| import _, {foo as bar} from 'foo' | ||
| import {foo as bar} from 'foo' | ||
| import * as _ from 'foo' | ||
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| const _ = require('foo') | ||
| const {foo} = require('foo') | ||
| const {foo: bar} = require('foo') | ||
| const [a, b] = require('foo') | ||
| const _ = require('foo') | ||
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| // Module is not assigned, but it is used | ||
| bar(require('foo')) | ||
| require('foo').bar | ||
| require('foo').bar() | ||
| require('foo')() | ||
| ``` |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| import isStaticRequire from '../core/staticRequire' | ||
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| function report(context, node) { | ||
| context.report({ | ||
| node, | ||
| message: 'Imported module should be assigned', | ||
| }) | ||
| } | ||
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| function create(context) { | ||
| return { | ||
| ImportDeclaration(node) { | ||
| if (node.specifiers.length === 0) { | ||
| report(context, node) | ||
| } | ||
| }, | ||
| ExpressionStatement(node) { | ||
| if (node.expression.type === 'CallExpression' && isStaticRequire(node.expression)) { | ||
| report(context, node.expression) | ||
| } | ||
| }, | ||
| } | ||
| } | ||
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| module.exports = { | ||
| create, | ||
| meta: { | ||
| docs: {}, | ||
| schema: [ | ||
| { | ||
| 'type': 'object', | ||
| 'properties': { | ||
| 'devDependencies': { 'type': ['boolean', 'array'] }, | ||
| 'optionalDependencies': { 'type': ['boolean', 'array'] }, | ||
| 'peerDependencies': { 'type': ['boolean', 'array'] }, | ||
| }, | ||
| 'additionalProperties': false, | ||
| }, | ||
| ], | ||
| }, | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| import { test } from '../utils' | ||
| import * as path from 'path' | ||
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| import { RuleTester } from 'eslint' | ||
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| const ruleTester = new RuleTester() | ||
| , rule = require('rules/no-unassigned-import') | ||
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| const error = { | ||
| ruleId: 'no-unassigned-import', | ||
| message: 'Imported module should be assigned' | ||
| } | ||
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| ruleTester.run('no-unassigned-import', rule, { | ||
| valid: [ | ||
| test({ code: 'import _ from "lodash"'}), | ||
| test({ code: 'import _, {foo} from "lodash"'}), | ||
| test({ code: 'import _, {foo as bar} from "lodash"'}), | ||
| test({ code: 'import {foo as bar} from "lodash"'}), | ||
| test({ code: 'import * as _ from "lodash"'}), | ||
| test({ code: 'import _ from "./"'}), | ||
| test({ code: 'const _ = require("lodash")'}), | ||
| test({ code: 'const {foo} = require("lodash")'}), | ||
| test({ code: 'const {foo: bar} = require("lodash")'}), | ||
| test({ code: 'const [a, b] = require("lodash")'}), | ||
| test({ code: 'const _ = require("lodash")'}), | ||
| test({ code: 'const _ = require("./")'}), | ||
| test({ code: 'foo(require("lodash"))'}), | ||
| test({ code: 'require("lodash").foo'}), | ||
| test({ code: 'require("lodash").foo()'}), | ||
| test({ code: 'require("lodash")()'}), | ||
| ], | ||
| invalid: [ | ||
| test({ | ||
| code: 'import "lodash"', | ||
| errors: [error], | ||
| }), | ||
| test({ | ||
| code: 'require("lodash")', | ||
| errors: [error], | ||
| }), | ||
| ], | ||
| }) |