Gifsicle browser engine sources and licenses

Wrapper: gifsicle-wasm-browser v1.5.19, MIT, renzhezhilu.
https://github.com/renzhezhilu/gifsicle-wasm-browser/tree/v1.5.19
Local archive: /vendor/gifsicle-wasm-browser-1.5.19-source.tar.gz
Original compiled worker is extracted without modifications from the npm 1.5.19 distribution.
The project provides src/build.js, src/worker.js, src/gifsicle.js and the WebAssembly binary.

Underlying tool: Gifsicle 1.92 (as identified by the wrapper README), GPL v2.
Source archive: /vendor/gifsicle-1.92-source.tar.gz
License: /vendor/GIFSICLE-COPYING.txt
https://www.lcdf.org/gifsicle/

GifSquish's browser UI, validation, command generation and lifecycle handling are separate source modules served as unminified JavaScript.