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85 lines
2.6 KiB
JavaScript
85 lines
2.6 KiB
JavaScript
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/**
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* @fileoverview Rule to flag use of an object property of the global object (Math and JSON) as a function
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* @author James Allardice
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const { CALL, CONSTRUCT, ReferenceTracker } = require("eslint-utils");
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const getPropertyName = require("./utils/ast-utils").getStaticPropertyName;
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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const nonCallableGlobals = ["Atomics", "JSON", "Math", "Reflect"];
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/**
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* Returns the name of the node to report
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* @param {ASTNode} node A node to report
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* @returns {string} name to report
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*/
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function getReportNodeName(node) {
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if (node.type === "ChainExpression") {
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return getReportNodeName(node.expression);
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}
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if (node.type === "MemberExpression") {
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return getPropertyName(node);
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}
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return node.name;
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}
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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: "problem",
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docs: {
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description: "disallow calling global object properties as functions",
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category: "Possible Errors",
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recommended: true,
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url: "https://eslint.org/docs/rules/no-obj-calls"
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},
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schema: [],
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messages: {
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unexpectedCall: "'{{name}}' is not a function.",
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unexpectedRefCall: "'{{name}}' is reference to '{{ref}}', which is not a function."
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}
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},
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create(context) {
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return {
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Program() {
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const scope = context.getScope();
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const tracker = new ReferenceTracker(scope);
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const traceMap = {};
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for (const g of nonCallableGlobals) {
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traceMap[g] = {
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[CALL]: true,
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[CONSTRUCT]: true
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};
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}
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for (const { node, path } of tracker.iterateGlobalReferences(traceMap)) {
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const name = getReportNodeName(node.callee);
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const ref = path[0];
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const messageId = name === ref ? "unexpectedCall" : "unexpectedRefCall";
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context.report({ node, messageId, data: { name, ref } });
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}
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}
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};
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}
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};
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