144 lines
3.9 KiB
JavaScript
144 lines
3.9 KiB
JavaScript
/**
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* @fileoverview Rule to flag use of alert, confirm, prompt
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* @author Nicholas C. Zakas
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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 {
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getStaticPropertyName: getPropertyName,
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getVariableByName,
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skipChainExpression,
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} = 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 name is a prohibited identifier.
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* @param {string} name The name to check
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* @returns {boolean} Whether or not the name is prohibited.
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*/
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function isProhibitedIdentifier(name) {
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return /^(alert|confirm|prompt)$/u.test(name);
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}
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/**
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* Finds the eslint-scope reference in the given scope.
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* @param {Object} scope The scope to search.
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* @param {ASTNode} node The identifier node.
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* @returns {Reference|null} Returns the found reference or null if none were found.
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*/
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function findReference(scope, node) {
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const references = scope.references.filter(
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(reference) =>
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reference.identifier.range[0] === node.range[0] &&
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reference.identifier.range[1] === node.range[1]
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);
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if (references.length === 1) {
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return references[0];
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}
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return null;
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}
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/**
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* Checks if the given identifier node is shadowed in the given scope.
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* @param {Object} scope The current scope.
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* @param {string} node The identifier node to check
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* @returns {boolean} Whether or not the name is shadowed.
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*/
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function isShadowed(scope, node) {
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const reference = findReference(scope, node);
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return reference && reference.resolved && reference.resolved.defs.length > 0;
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}
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/**
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* Checks if the given identifier node is a ThisExpression in the global scope or the global window property.
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* @param {Object} scope The current scope.
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* @param {string} node The identifier node to check
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* @returns {boolean} Whether or not the node is a reference to the global object.
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*/
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function isGlobalThisReferenceOrGlobalWindow(scope, node) {
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if (scope.type === 'global' && node.type === 'ThisExpression') {
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return true;
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}
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if (
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node.type === 'Identifier' &&
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(node.name === 'window' ||
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(node.name === 'globalThis' && getVariableByName(scope, 'globalThis')))
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) {
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return !isShadowed(scope, node);
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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('../types').Rule.RuleModule} */
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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 the use of `alert`, `confirm`, and `prompt`',
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recommended: false,
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url: 'https://eslint.org/docs/latest/rules/no-alert',
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},
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schema: [],
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messages: {
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unexpected: 'Unexpected {{name}}.',
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},
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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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const callee = skipChainExpression(node.callee),
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currentScope = sourceCode.getScope(node);
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// without window.
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if (callee.type === 'Identifier') {
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const name = callee.name;
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if (
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!isShadowed(currentScope, callee) &&
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isProhibitedIdentifier(callee.name)
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) {
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context.report({
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node,
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messageId: 'unexpected',
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data: { name },
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});
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}
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} else if (
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callee.type === 'MemberExpression' &&
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isGlobalThisReferenceOrGlobalWindow(currentScope, callee.object)
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) {
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const name = getPropertyName(callee);
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if (isProhibitedIdentifier(name)) {
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context.report({
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node,
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messageId: 'unexpected',
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data: { name },
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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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