This is a Pascal compiler that targets WebAssembly, designed specifically to compile TeX.
The following assumes you have TeX running on your machine (e.g., that
tangle is available).
Download a clean copy of the TeX WEB sources.
wget http://ctan.math.washington.edu/tex-archive/systems/knuth/dist/tex/tex.web
Produce the Pascal source by tangling.
tangle -underline tex.web
You will now have the Pascal source tex.p along with tex.pool which contains the strings.
Compile the tex.p sources to get the the WebAssembly binary out.wasm
npm install
npm run-script build
node compile.js tex.p
Produce plain.fmt and a corresponding memory dump.
node initex.js
Now compile sample.tex by running
node tex.js