[@types/browserslist] Added error.d.ts to browserslist (#33772)

* Added error.d.ts to browserslist

* Upgrade browserslist version number

* Added type test

* Removed patch version and add space to test

* Set browserslist to always be true

types/browserslist/browserslist-tests.ts

@@ -1,4 +1,5 @@
 import browserslist from "browserslist";
+import BrowserslistError from "browserslist/error";
 
 browserslist(); // $ExpectType string[]
 browserslist(""); // $ExpectType string[]
@@ -20,3 +21,5 @@ for (const opt of opts) {
 
 browserslist.coverage([""]); // $ExpectType number
 browserslist.coverage([""], { "": { "": 0 } }); // $ExpectType number
+
+new BrowserslistError('error'); // $ExpectType BrowserslistError

types/browserslist/error.d.ts

@@ -0,0 +1,6 @@
+declare class BrowserslistError extends Error {
+    constructor(message: any);
+    browserslist: true;
+}
+
+export = BrowserslistError;

types/browserslist/index.d.ts

@@ -1,6 +1,7 @@
-// Type definitions for browserslist 4.3
+// Type definitions for browserslist 4.4
 // Project: https://github.com/browserslist/browserslist#readme
 // Definitions by: Dave Cardwell <https://github.com/davecardwell>
+//                 Andrew Leedham <https://github.com/AndrewLeedham>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.7
 

types/browserslist/tsconfig.json

@@ -13,5 +13,5 @@
         "forceConsistentCasingInFileNames": true,
         "esModuleInterop": true
     },
-    "files": ["index.d.ts", "browserslist-tests.ts"]
+    "files": ["index.d.ts", "browserslist-tests.ts", "error.d.ts"]
 }