This is based on torch2424's wasmBoy emulator written in AssemblyScript (a subset of TypeScript) that is then compiled to Rust. All of the actual emulator code was written by them.
Click to see wasmboy-rs in action:
Copyright 2018 torch2424
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.