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| /** | |
| * @fileoverview Rule to disallow assignments to native objects or read-only global variables | |
| * @author Ilya Volodin | |
| * @deprecated in ESLint v3.3.0 | |
| */ | |
| "use strict"; | |
| //------------------------------------------------------------------------------ | |
| // Rule Definition | |
| //------------------------------------------------------------------------------ | |
| module.exports = { | |
| meta: { | |
| type: "suggestion", | |
| docs: { | |
| description: "disallow assignments to native objects or read-only global variables", | |
| category: "Best Practices", | |
| recommended: false, | |
| url: "https://eslint.org/docs/rules/no-native-reassign" | |
| }, | |
| deprecated: true, | |
| replacedBy: ["no-global-assign"], | |
| schema: [ | |
| { | |
| type: "object", | |
| properties: { | |
| exceptions: { | |
| type: "array", | |
| items: { type: "string" }, | |
| uniqueItems: true | |
| } | |
| }, | |
| additionalProperties: false | |
| } | |
| ] | |
| }, | |
| create(context) { | |
| const config = context.options[0]; | |
| const exceptions = (config && config.exceptions) || []; | |
| /** | |
| * Reports write references. | |
| * @param {Reference} reference A reference to check. | |
| * @param {int} index The index of the reference in the references. | |
| * @param {Reference[]} references The array that the reference belongs to. | |
| * @returns {void} | |
| */ | |
| function checkReference(reference, index, references) { | |
| const identifier = reference.identifier; | |
| if (reference.init === false && | |
| reference.isWrite() && | |
| /* | |
| * Destructuring assignments can have multiple default value, | |
| * so possibly there are multiple writeable references for the same identifier. | |
| */ | |
| (index === 0 || references[index - 1].identifier !== identifier) | |
| ) { | |
| context.report({ | |
| node: identifier, | |
| message: "Read-only global '{{name}}' should not be modified.", | |
| data: identifier | |
| }); | |
| } | |
| } | |
| /** | |
| * Reports write references if a given variable is read-only builtin. | |
| * @param {Variable} variable A variable to check. | |
| * @returns {void} | |
| */ | |
| function checkVariable(variable) { | |
| if (variable.writeable === false && exceptions.indexOf(variable.name) === -1) { | |
| variable.references.forEach(checkReference); | |
| } | |
| } | |
| return { | |
| Program() { | |
| const globalScope = context.getScope(); | |
| globalScope.variables.forEach(checkVariable); | |
| } | |
| }; | |
| } | |
| }; |