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123 lines
3.7 KiB
JavaScript
123 lines
3.7 KiB
JavaScript
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/**
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* @fileoverview Restrict usage of specified globals.
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* @author Benoît Zugmeyer
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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type: "suggestion",
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docs: {
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description: "disallow specified global variables",
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category: "Variables",
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recommended: false,
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url: "https://eslint.org/docs/rules/no-restricted-globals"
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},
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schema: {
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type: "array",
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items: {
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oneOf: [
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{
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type: "string"
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},
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{
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type: "object",
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properties: {
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name: { type: "string" },
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message: { type: "string" }
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},
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required: ["name"],
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additionalProperties: false
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}
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]
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},
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uniqueItems: true,
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minItems: 0
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},
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messages: {
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defaultMessage: "Unexpected use of '{{name}}'.",
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// eslint-disable-next-line eslint-plugin/report-message-format
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customMessage: "Unexpected use of '{{name}}'. {{customMessage}}"
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}
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},
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create(context) {
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// If no globals are restricted, we don't need to do anything
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if (context.options.length === 0) {
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return {};
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}
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const restrictedGlobalMessages = context.options.reduce((memo, option) => {
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if (typeof option === "string") {
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memo[option] = null;
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} else {
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memo[option.name] = option.message;
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}
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return memo;
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}, {});
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/**
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* Report a variable to be used as a restricted global.
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* @param {Reference} reference the variable reference
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* @returns {void}
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* @private
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*/
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function reportReference(reference) {
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const name = reference.identifier.name,
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customMessage = restrictedGlobalMessages[name],
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messageId = customMessage
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? "customMessage"
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: "defaultMessage";
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context.report({
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node: reference.identifier,
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messageId,
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data: {
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name,
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customMessage
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}
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});
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}
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/**
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* Check if the given name is a restricted global name.
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* @param {string} name name of a variable
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* @returns {boolean} whether the variable is a restricted global or not
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* @private
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*/
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function isRestricted(name) {
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return Object.prototype.hasOwnProperty.call(restrictedGlobalMessages, name);
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}
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return {
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Program() {
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const scope = context.getScope();
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// Report variables declared elsewhere (ex: variables defined as "global" by eslint)
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scope.variables.forEach(variable => {
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if (!variable.defs.length && isRestricted(variable.name)) {
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variable.references.forEach(reportReference);
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}
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});
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// Report variables not declared at all
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scope.through.forEach(reference => {
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if (isRestricted(reference.identifier.name)) {
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reportReference(reference);
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}
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});
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}
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};
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}
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};
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