Forgot about the new construction for TypeError

Author: CMCDragonkai

lib/Counter.js

@@ -295,7 +295,7 @@ class Counter {
   constructor (begin, blockSize) {
     if (typeof begin === 'undefined') begin = 0;
     if (blockSize && blockSize % 32 !== 0) {
-      throw TypeError('Blocksize for BitMapTree must be a multiple of 32');
+      throw new TypeError('Blocksize for BitMapTree must be a multiple of 32');
     } else {
       // JavaScript doesn't yet have 64 bit numbers so we default to 32
       blockSize = 32;