51 lines
1.7 KiB
TypeScript
51 lines
1.7 KiB
TypeScript
/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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import * as eslint from 'eslint';
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import { TSESTree } from '@typescript-eslint/experimental-utils';
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import * as ESTree from 'estree';
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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const _positiveLookBehind = /\(\?<=.+/;
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const _negativeLookBehind = /\(\?<!.+/;
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function _containsLookBehind(pattern: string | unknown): boolean {
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if (typeof pattern !== 'string') {
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return false;
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}
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return _positiveLookBehind.test(pattern) || _negativeLookBehind.test(pattern);
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}
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module.exports = {
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create(context: eslint.Rule.RuleContext) {
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return {
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// /.../
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['Literal[regex]']: (node: any) => {
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type RegexLiteral = TSESTree.Literal & { regex: { pattern: string; flags: string } };
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const pattern = (<RegexLiteral>node).regex?.pattern;
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if (_containsLookBehind(pattern)) {
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context.report({
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node,
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message: 'Look behind assertions are not yet supported in all browsers'
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});
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}
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},
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// new Regex("...")
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['NewExpression[callee.name="RegExp"] Literal']: (node: ESTree.Literal) => {
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if (_containsLookBehind(node.value)) {
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context.report({
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node,
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message: 'Look behind assertions are not yet supported in all browsers'
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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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