Create new type definition for 'escape-regexp' (#4058)

src/@types/escape-regexp.d.ts

@@ -0,0 +1,7 @@
+declare module 'escape-regexp' {
+	function escapeRegExp(str: string): string;
+
+	namespace escapeRegExp {} // Hack
+
+	export = escapeRegExp;
+}

src/server/api/endpoints/hashtags/search.ts

@@ -1,7 +1,7 @@
 import $ from 'cafy';
 import Hashtag from '../../../../models/hashtag';
 import define from '../../define';
-const escapeRegexp = require('escape-regexp');
+import * as escapeRegexp from 'escape-regexp';
 
 export const meta = {
 	desc: {

src/server/api/endpoints/users/search.ts

@@ -1,5 +1,5 @@
 import $ from 'cafy';
-const escapeRegexp = require('escape-regexp');
+import * as escapeRegexp from 'escape-regexp';
 import User, { pack, validateUsername, IUser } from '../../../../models/user';
 import define from '../../define';