Forcing TypeScript >= 2.1 is the only apparent way.

types/ansi/ansi-tests.ts

@@ -22,9 +22,9 @@ Object.keys({
 }).forEach((color) => {
     const cname = color.replace(/([a-z])([A-Z])/g, (_: string, l: string, u: string): string => `${l} ${u.toLowerCase()}`);
 
-    (<ansi.Cursor>(((<(...anything: any[]) => ansi.Cursor> cursor[color])()
+    ((<(...anything: any[]) => ansi.Cursor> cursor[color])()
         .bold()
-        .bg)[color === 'blue' || color === 'brightBlue' ? 'black' : 'blue']()))
+        .bg)[color === 'blue' || color === 'brightBlue' ? 'black' : 'blue']()
         .write(
             `Hello, bold ${cname} world!\n`
         )

types/ansi/index.d.ts

@@ -2,6 +2,7 @@
 // Project: https://www.npmjs.com/package/ansi
 // Definitions by: Gustavo6046 <https://github.com/Gustavo6046>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript version: 2.1
 
 /**
  * References: