wallet-core/node_modules/create-hash/readme.md

create-hash

Node style hashes for use in the browser, with native hash functions in node. Api is the same as hashes in node:

var createHash = require('create-hash');
var hash = createHash('sha224');
hash.update('synchronous write'); //optional encoding parameter
hash.digest();// synchronously get result with optional encoding parameter

hash.write('write to it as a stream');
hash.end();//remember it's a stream
hash.read();//only if you ended it as a stream though

To get the JavaScript version even in node do require('create-hash/browser');