115 lines
4.2 KiB
JavaScript
115 lines
4.2 KiB
JavaScript
/**
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* @fileoverview Prefers Object.hasOwn() instead of Object.prototype.hasOwnProperty.call()
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* @author Nitin Kumar
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* @author Gautam Arora
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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 astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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/**
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* Checks if the given node is considered to be an access to a property of `Object.prototype`.
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* @param {ASTNode} node `MemberExpression` node to evaluate.
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* @returns {boolean} `true` if `node.object` is `Object`, `Object.prototype`, or `{}` (empty 'ObjectExpression' node).
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*/
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function hasLeftHandObject(node) {
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/*
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* ({}).hasOwnProperty.call(obj, prop) - `true`
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* ({ foo }.hasOwnProperty.call(obj, prop)) - `false`, object literal should be empty
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*/
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if (node.object.type === "ObjectExpression" && node.object.properties.length === 0) {
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return true;
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}
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const objectNodeToCheck = node.object.type === "MemberExpression" && astUtils.getStaticPropertyName(node.object) === "prototype" ? node.object.object : node.object;
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if (objectNodeToCheck.type === "Identifier" && objectNodeToCheck.name === "Object") {
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return true;
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}
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return false;
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}
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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/** @type {import('../shared/types').Rule} */
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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:
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"Disallow use of `Object.prototype.hasOwnProperty.call()` and prefer use of `Object.hasOwn()`",
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recommended: false,
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url: "https://eslint.org/docs/latest/rules/prefer-object-has-own"
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},
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schema: [],
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messages: {
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useHasOwn: "Use 'Object.hasOwn()' instead of 'Object.prototype.hasOwnProperty.call()'."
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},
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fixable: "code"
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},
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create(context) {
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const sourceCode = context.sourceCode;
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return {
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CallExpression(node) {
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if (!(node.callee.type === "MemberExpression" && node.callee.object.type === "MemberExpression")) {
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return;
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}
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const calleePropertyName = astUtils.getStaticPropertyName(node.callee);
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const objectPropertyName = astUtils.getStaticPropertyName(node.callee.object);
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const isObject = hasLeftHandObject(node.callee.object);
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// check `Object` scope
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const scope = sourceCode.getScope(node);
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const variable = astUtils.getVariableByName(scope, "Object");
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if (
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calleePropertyName === "call" &&
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objectPropertyName === "hasOwnProperty" &&
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isObject &&
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variable && variable.scope.type === "global"
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) {
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context.report({
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node,
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messageId: "useHasOwn",
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fix(fixer) {
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if (sourceCode.getCommentsInside(node.callee).length > 0) {
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return null;
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}
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const tokenJustBeforeNode = sourceCode.getTokenBefore(node.callee, { includeComments: true });
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// for https://github.com/eslint/eslint/pull/15346#issuecomment-991417335
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if (
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tokenJustBeforeNode &&
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tokenJustBeforeNode.range[1] === node.callee.range[0] &&
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!astUtils.canTokensBeAdjacent(tokenJustBeforeNode, "Object.hasOwn")
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) {
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return fixer.replaceText(node.callee, " Object.hasOwn");
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}
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return fixer.replaceText(node.callee, "Object.hasOwn");
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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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};
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