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/** * @fileoverview A rule to disallow `this` keywords in contexts where the value of `this` is `undefined`. * @author Toru Nagashima */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ /** * Determines if the given code path is a code path with lexical `this` binding. * That is, if `this` within the code path refers to `this` of surrounding code path. * @param {CodePath} codePath Code path. * @param {ASTNode} node Node that started the code path. * @returns {boolean} `true` if it is a code path with lexical `this` binding. */ function isCodePathWithLexicalThis(codePath, node) { return codePath.origin === "function" && node.type === "ArrowFunctionExpression"; } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Disallow use of `this` in contexts where the value of `this` is `undefined`", recommended: false, url: "https://eslint.org/docs/latest/rules/no-invalid-this" }, schema: [ { type: "object", properties: { capIsConstructor: { type: "boolean", default: true } }, additionalProperties: false } ], messages: { unexpectedThis: "Unexpected 'this'." } }, create(context) { const options = context.options[0] || {}; const capIsConstructor = options.capIsConstructor !== false; const stack = [], sourceCode = context.sourceCode; /** * Gets the current checking context. * * The return value has a flag that whether or not `this` keyword is valid. * The flag is initialized when got at the first time. * @returns {{valid: boolean}} * an object which has a flag that whether or not `this` keyword is valid. */ stack.getCurrent = function() { const current = this[this.length - 1]; if (!current.init) { current.init = true; current.valid = !astUtils.isDefaultThisBinding( current.node, sourceCode, { capIsConstructor } ); } return current; }; return { onCodePathStart(codePath, node) { if (isCodePathWithLexicalThis(codePath, node)) { return; } if (codePath.origin === "program") { const scope = sourceCode.getScope(node); const features = context.languageOptions.parserOptions.ecmaFeatures || {}; // `this` at the top level of scripts always refers to the global object stack.push({ init: true, node, valid: !( node.sourceType === "module" || (features.globalReturn && scope.childScopes[0].isStrict) ) }); return; } /* * `init: false` means that `valid` isn't determined yet. * Most functions don't use `this`, and the calculation for `valid` * is relatively costly, so we'll calculate it lazily when the first * `this` within the function is traversed. A special case are non-strict * functions, because `this` refers to the global object and therefore is * always valid, so we can set `init: true` right away. */ stack.push({ init: !sourceCode.getScope(node).isStrict, node, valid: true }); }, onCodePathEnd(codePath, node) { if (isCodePathWithLexicalThis(codePath, node)) { return; } stack.pop(); }, // Reports if `this` of the current context is invalid. ThisExpression(node) { const current = stack.getCurrent(); if (current && !current.valid) { context.report({ node, messageId: "unexpectedThis" }); } } }; } };