[build] TypeScript environment somehow changed, TypeScript target failing

[kaby76]

Builds for testing the TypeScript target get the following error:

Error [ERR_MODULE_NOT_FOUND]: Cannot find module 'C:\msys64\home\Kenne\issues\g4-3880\abb\Generated-TypeScript\abbLexer' imported from C:\msys64\home\Kenne\issues\g4-3880\abb\Generated-TypeScript\Test.js
Did you mean to import ../abbLexer.js?
    at finalizeResolution (node:internal/modules/esm/resolve:264:11)
    at moduleResolve (node:internal/modules/esm/resolve:917:10)
    at defaultResolve (node:internal/modules/esm/resolve:1130:11)
    at nextResolve (node:internal/modules/esm/hooks:749:28)
    at resolve (C:\Users\kenne\AppData\Roaming\npm\node_modules\ts-node\dist\child\child-loader.js:15:125)
    at nextResolve (node:internal/modules/esm/hooks:749:28)
    at Hooks.resolve (node:internal/modules/esm/hooks:237:30)
    at handleMessage (node:internal/modules/esm/worker:199:24)
    at checkForMessages (node:internal/modules/esm/worker:141:28)
    at process.<anonymous> (node:internal/modules/esm/worker:160:5) {
  code: 'ERR_MODULE_NOT_FOUND',
  url: 'file:///C:/msys64/home/Kenne/issues/g4-3880/abb/Generated-TypeScript/abbLexer'
}

Fortunately, the fix is easy. Change these lines to generate this:

import abbLexer from './abbLexer.js';
import abbParser from './abbParser.js';

[kaby76]

The Issue is fixed with PR #3883.

But, I am now interested in why the TypeScript environment suddenly failed.

• There is no explicit "setup typescript" as with every other target. https://www.google.com/search?q=github+actions+setup+typescript&rlz=1C1NDCM_enUS742US742&oq=github+actions+setup+typescript&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIGCAEQRRhA0gEIODg3MWowajeoAgCwAgA&sourceid=chrome&ie=UTF-8
• I don't understand how it was installed. There should be zero base support for TypeScript out of the box for any OS.
• Somewhere, someone did a npm install -g typescript
  https://code.visualstudio.com/docs/typescript/typescript-compiling#:~:text=Tip%3A%20To%20get%20a%20specific,save%2Ddev%20typescript%40next%20.
• Ah. I see now. This:

  grammars-v4/_scripts/templates/TypeScript/st.build.sh

  Line 16 in 7f1d17c

  npm install -g typescript ts-node

  and

  grammars-v4/_scripts/templates/TypeScript/st.build.ps1

  Line 19 in 7f1d17c

  $(& npm install -g typescript ts-node ; $compile_exit_code = $LASTEXITCODE ) | Write-Host

  . No, we need to install a specific version of TypeScript!