2 * @fileoverview Rule to enforce the use of `u` flag on RegExp.
3 * @author Toru Nagashima
8 //------------------------------------------------------------------------------
10 //------------------------------------------------------------------------------
17 } = require("eslint-utils");
19 //------------------------------------------------------------------------------
21 //------------------------------------------------------------------------------
28 description: "enforce the use of `u` flag on RegExp",
29 category: "Best Practices",
31 url: "https://eslint.org/docs/rules/require-unicode-regexp"
35 requireUFlag: "Use the 'u' flag."
43 "Literal[regex]"(node) {
44 const flags = node.regex.flags || "";
46 if (!flags.includes("u")) {
47 context.report({ node, messageId: "requireUFlag" });
52 const scope = context.getScope();
53 const tracker = new ReferenceTracker(scope);
55 RegExp: { [CALL]: true, [CONSTRUCT]: true }
58 for (const { node } of tracker.iterateGlobalReferences(trackMap)) {
59 const flagsNode = node.arguments[1];
60 const flags = getStringIfConstant(flagsNode, scope);
62 if (!flagsNode || (typeof flags === "string" && !flags.includes("u"))) {
63 context.report({ node, messageId: "requireUFlag" });