add regexgen support (#47096)

types/regexgen/index.d.ts

@@ -0,0 +1,20 @@
+// Type definitions for regexgen 1.3
+// Project: https://github.com/devongovett/regexgen
+// Definitions by: Septs <https://github.com/septs>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 4.0
+
+declare function regexgen(inputs: string[], flags?: RegExp['flags']): RegExp;
+
+declare namespace regexgen {
+    class Trie {
+        add(input: string): void;
+        addAll(inputs: string[]): void;
+        minimize(): void;
+
+        toString(flags?: RegExp['flags']): string;
+        toRegExp(flags?: RegExp['flags']): RegExp;
+    }
+}
+
+export = regexgen;

types/regexgen/regexgen-tests.ts

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+import regexgen = require('regexgen');
+
+regexgen(['foobar', 'foobaz', 'foozap', 'fooza']);
+
+const t = new regexgen.Trie();
+t.add('foobar');
+t.add('foobaz');
+t.toRegExp();

types/regexgen/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["es6"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": ["../"],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": ["index.d.ts", "regexgen-tests.ts"]
+}

types/regexgen/tslint.json

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+{
+    "extends": "dtslint/dt.json"
+}