feat: Add is‑regex v1.0 (#45252)

types/is-regex/index.d.ts

@@ -0,0 +1,11 @@
+// Type definitions for is-regex 1.0
+// Project: https://github.com/ljharb/is-regex
+// Definitions by: Jordan Harband <https://github.com/ljharb>
+//                 ExE Boss <https://github.com/ExE-Boss>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/**
+ * Returns whether the value is a valid `RegExp` object with the `[[RegExpMatcher]]` internal slot.
+ */
+declare function isRegex(value: any): value is RegExp;
+export = isRegex;

types/is-regex/is-regex-tests.ts

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+import isRegExp = require('is-regex');
+
+declare var any: unknown;
+
+if (isRegExp(any)) {
+    any; // $ExpectType RegExp
+}

types/is-regex/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["ES2015"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": ["../"],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "is-regex-tests.ts",
+        "index.d.ts"
+    ]
+}

types/is-regex/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }