require-unicode-regexp.js
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/**
* @fileoverview Rule to enforce the use of `u` flag on RegExp.
* @author Toru Nagashima
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const {
CALL,
CONSTRUCT,
ReferenceTracker,
getStringIfConstant
} = require("eslint-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "suggestion",
docs: {
description: "enforce the use of `u` flag on RegExp",
category: "Best Practices",
recommended: false,
url: "https://eslint.org/docs/rules/require-unicode-regexp"
},
messages: {
requireUFlag: "Use the 'u' flag."
},
schema: []
},
create(context) {
return {
"Literal[regex]"(node) {
const flags = node.regex.flags || "";
if (!flags.includes("u")) {
context.report({ node, messageId: "requireUFlag" });
}
},
Program() {
const scope = context.getScope();
const tracker = new ReferenceTracker(scope);
const trackMap = {
RegExp: { [CALL]: true, [CONSTRUCT]: true }
};
for (const { node } of tracker.iterateGlobalReferences(trackMap)) {
const flagsNode = node.arguments[1];
const flags = getStringIfConstant(flagsNode, scope);
if (!flagsNode || (typeof flags === "string" && !flags.includes("u"))) {
context.report({ node, messageId: "requireUFlag" });
}
}
}
};
}
};