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- "use strict";
- const astUtils = require("./utils/ast-utils");
- module.exports = {
- meta: {
- type: "suggestion",
- docs: {
- description: "disallow `this` keywords outside of classes or class-like objects",
- category: "Best Practices",
- recommended: false,
- url: "https://eslint.org/docs/rules/no-invalid-this"
- },
- schema: [
- {
- type: "object",
- properties: {
- capIsConstructor: {
- type: "boolean",
- default: true
- }
- },
- additionalProperties: false
- }
- ]
- },
- create(context) {
- const options = context.options[0] || {};
- const capIsConstructor = options.capIsConstructor !== false;
- const stack = [],
- sourceCode = context.getSourceCode();
-
- 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;
- };
-
- function enterFunction(node) {
-
- stack.push({
- init: !context.getScope().isStrict,
- node,
- valid: true
- });
- }
-
- function exitFunction() {
- stack.pop();
- }
- return {
-
- Program(node) {
- const scope = context.getScope(),
- features = context.parserOptions.ecmaFeatures || {};
- stack.push({
- init: true,
- node,
- valid: !(
- scope.isStrict ||
- node.sourceType === "module" ||
- (features.globalReturn && scope.childScopes[0].isStrict)
- )
- });
- },
- "Program:exit"() {
- stack.pop();
- },
- FunctionDeclaration: enterFunction,
- "FunctionDeclaration:exit": exitFunction,
- FunctionExpression: enterFunction,
- "FunctionExpression:exit": exitFunction,
-
- ThisExpression(node) {
- const current = stack.getCurrent();
- if (current && !current.valid) {
- context.report({ node, message: "Unexpected 'this'." });
- }
- }
- };
- }
- };
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