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| /** | |
| * @fileoverview Rule to flag when initializing to undefined | |
| * @author Ilya Volodin | |
| */ | |
| "use strict"; | |
| const astUtils = require("./utils/ast-utils"); | |
| //------------------------------------------------------------------------------ | |
| // Rule Definition | |
| //------------------------------------------------------------------------------ | |
| module.exports = { | |
| meta: { | |
| type: "suggestion", | |
| docs: { | |
| description: "disallow initializing variables to `undefined`", | |
| category: "Variables", | |
| recommended: false, | |
| url: "https://eslint.org/docs/rules/no-undef-init" | |
| }, | |
| schema: [], | |
| fixable: "code" | |
| }, | |
| create(context) { | |
| const sourceCode = context.getSourceCode(); | |
| return { | |
| VariableDeclarator(node) { | |
| const name = sourceCode.getText(node.id), | |
| init = node.init && node.init.name, | |
| scope = context.getScope(), | |
| undefinedVar = astUtils.getVariableByName(scope, "undefined"), | |
| shadowed = undefinedVar && undefinedVar.defs.length > 0, | |
| lastToken = sourceCode.getLastToken(node); | |
| if (init === "undefined" && node.parent.kind !== "const" && !shadowed) { | |
| context.report({ | |
| node, | |
| message: "It's not necessary to initialize '{{name}}' to undefined.", | |
| data: { name }, | |
| fix(fixer) { | |
| if (node.parent.kind === "var") { | |
| return null; | |
| } | |
| if (node.id.type === "ArrayPattern" || node.id.type === "ObjectPattern") { | |
| // Don't fix destructuring assignment to `undefined`. | |
| return null; | |
| } | |
| if (sourceCode.commentsExistBetween(node.id, lastToken)) { | |
| return null; | |
| } | |
| return fixer.removeRange([node.id.range[1], node.range[1]]); | |
| } | |
| }); | |
| } | |
| } | |
| }; | |
| } | |
| }; |