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Add rule to enforce default import aliases
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,56 @@ | ||
| # import/rename-default-import | ||
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| This rule will enforce a specific binding name for a default package import. | ||
| Works for ES6 imports and CJS require. | ||
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| ## Rule Details | ||
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| Given: | ||
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| There is a package `prop-types` with a default export | ||
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| and | ||
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| ```json | ||
| // .eslintrc | ||
| { | ||
| "rules": { | ||
| "import/rename-default-import": [ | ||
| "warn", { | ||
| "prop-types": "PropTypes", // key: name of the module, value: desired binding for default import | ||
| } | ||
| ] | ||
| } | ||
| } | ||
| ``` | ||
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| The following is considered valid: | ||
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| ```js | ||
| import {default as PropTypes} from 'prop-types' | ||
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| import PropTypes from 'prop-types' | ||
| ``` | ||
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| ...and the following cases are reported: | ||
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| ```js | ||
| import propTypes from 'prop-types'; | ||
| import {default as propTypes} from 'prop-types'; | ||
| ``` | ||
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| ## When not to use it | ||
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| As long as you don't want to enforce specific naming for default imports. | ||
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| ## Options | ||
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| This rule accepts an object which is a mapping | ||
| between package name and the binding name that should be used for default imports. | ||
| For example, a configuration like the one below | ||
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| `{'prop-types': 'PropTypes'}` | ||
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| specifies that default import for the package `prop-types` should be aliased to `PropTypes`. |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| /** | ||
| * @fileoverview Rule to enforce aliases for default imports | ||
| * @author Michał Kołodziejski | ||
| */ | ||
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| import docsUrl from '../docsUrl' | ||
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| function isDefaultImport(specifier) { | ||
| if (specifier.type === 'ImportDefaultSpecifier') { | ||
| return true | ||
| } else if (specifier.type === 'ImportSpecifier' && specifier.imported.name === 'default') { | ||
| return true | ||
| } | ||
| return false | ||
| } | ||
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| function isCommonJSImport(declaration) { | ||
| const variableInit = declaration.init | ||
| if (variableInit.type === 'CallExpression') { | ||
| return variableInit.callee.name === 'require' | ||
| } | ||
| return false | ||
| } | ||
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| function handleImport(context, node, specifierOrDeclaration, packageName, importAlias) { | ||
| const mappings = context.options[0] || {} | ||
| const expectedAlias = mappings[packageName] | ||
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| if (expectedAlias === undefined || expectedAlias === importAlias) { | ||
| return | ||
| } | ||
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| let declaredVariables | ||
| if (specifierOrDeclaration.type === 'VariableDeclarator') { | ||
| declaredVariables = context.getDeclaredVariables(specifierOrDeclaration.parent)[0] | ||
| } else { | ||
| declaredVariables = context.getDeclaredVariables(specifierOrDeclaration)[0] | ||
| } | ||
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| const references = declaredVariables.references | ||
| const skipFixing = references.some((ref) => ref.identifier.parent.type === 'ExportSpecifier') | ||
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| context.report({ | ||
| node: node, | ||
| message: `Default import from '${packageName}' should be aliased to ` | ||
| + `${mappings[packageName]}, not ${importAlias}`, | ||
| fix: skipFixing ? null : fixImportOrRequire(specifierOrDeclaration, mappings[packageName]), | ||
| }) | ||
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| for (const variableReference of references) { | ||
| if (specifierOrDeclaration.type === 'VariableDeclarator' && variableReference.init) { | ||
| continue | ||
| } | ||
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| context.report({ | ||
| node: variableReference.identifier, | ||
| message: `Using incorrect binding name '${variableReference.identifier.name}' ` | ||
| + `instead of ${mappings[packageName]} for ` | ||
| + `default import from package ${packageName}`, | ||
| fix: fixer => { | ||
| if (skipFixing) { | ||
| return | ||
| } | ||
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| return fixer.replaceText(variableReference.identifier, mappings[packageName]) | ||
| }, | ||
| }) | ||
| } | ||
| } | ||
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| function fixImportOrRequire(node, text) { | ||
| return function(fixer) { | ||
| let newAlias = text | ||
| let nodeOrToken | ||
| if (node.type === 'VariableDeclarator') { | ||
| nodeOrToken = node.id | ||
| newAlias = text | ||
| } else { | ||
| nodeOrToken = node | ||
| if (node.imported && node.imported.name === 'default') { | ||
| newAlias = `default as ${text}` | ||
| } else { | ||
| newAlias = text | ||
| } | ||
| } | ||
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| return fixer.replaceText(nodeOrToken, newAlias) | ||
| } | ||
| } | ||
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| module.exports = { | ||
| meta: { | ||
| docs: { | ||
| url: docsUrl('rename-default-import'), | ||
| recommended: false, | ||
| }, | ||
| schema: [ | ||
| { | ||
| type: 'object', | ||
| }, | ||
| ], | ||
| fixable: 'code', | ||
| }, | ||
| create: function(context) { | ||
| return { | ||
| 'ImportDeclaration': function(node) { | ||
| const {source, specifiers} = node | ||
| const {options} = context | ||
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| if (options.length === 0 || Object.keys(options[0]).length === 0) { | ||
| return | ||
| } | ||
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| for (const specifier of specifiers) { | ||
| if (!isDefaultImport(specifier)) { | ||
| continue | ||
| } | ||
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| handleImport(context, source, specifier, source.value, specifier.local.name) | ||
| } | ||
| }, | ||
| 'VariableDeclaration': function(node) { | ||
| const {declarations} = node | ||
| const {options} = context | ||
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| if (options.length === 0 || Object.keys(options[0]).length === 0) { | ||
| return | ||
| } | ||
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| for (const declaration of declarations) { | ||
| if (!isCommonJSImport(declaration)) { | ||
| continue | ||
| } | ||
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| handleImport( | ||
| context, | ||
| node, | ||
| declaration, | ||
| declaration.init.arguments[0].value, | ||
| declaration.id.name | ||
| ) | ||
| } | ||
| }, | ||
| } | ||
| }, | ||
| } |
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