Since 5.0, the function parseJsonConfigFileContent is no longer built-in in _tsc.js

[Imgodmaoyouknow]

🔎 Search Terms

parseJsonConfigFileContent
parseJsonConfigFileContent is not defined

🕗 Version & Regression Information

• This changed between versions 5.0 and 5.9.3

⏯ Playground Link

No response

💻 Code

// index.ts
const a: number = "a";

npm init
npm install vue-tsc
npx vue-tsc index.ts --noEmit

🙁 Actual behavior

In version 4.x, the function parseJsonConfigFileContent in commandLineParser.ts will be packed in tsc.js.

but in version 5.x, it will be tree-shaked with esbuild. The final product does not include this function.

Tools such as vue-tsc will use this function, will report errors:

pnpm exec vue-tsc index.ts --noEmit

D:\test code\test 1\node_modules\.pnpm\vue-tsc@3.1.1_typescript@5.9.3\node_modules\vue-tsc\index.js:36
            throw err;
            ^

ReferenceError: parseJsonConfigFileContent is not defined
    at eval (eval at get (D:\test code\test 1\node_modules\.pnpm\typescript@5.9.3\node_modules\typescript\lib\tsc.js:122085:240), <anonymous>:1:1)
    at Object.get (D:\test code\test 1\node_modules\.pnpm\typescript@5.9.3\node_modules\typescript\lib\tsc.js:122085:240)
    at Object.createParsedCommandLineByJson (D:\test code\test 1\node_modules\.pnpm\@vue+language-core@3.1.1_typescript@5.9.3\node_modules\@vue\language-core\lib\compilerOptions.js:27:23)
    at D:\test code\test 1\node_modules\.pnpm\vue-tsc@3.1.1_typescript@5.9.3\node_modules\vue-tsc\index.js:14:20
    at Object.apply (D:\test code\test 1\node_modules\.pnpm\@volar+typescript@2.4.23\node_modules\@volar\typescript\lib\node\proxyCreateProgram.js:50:33)
    at performCompilation (D:\test code\test 1\node_modules\.pnpm\typescript@5.9.3\node_modules\typescript\lib\tsc.js:132244:19)
    at executeCommandLineWorker (D:\test code\test 1\node_modules\.pnpm\typescript@5.9.3\node_modules\typescript\lib\tsc.js:132086:7)        
    at executeCommandLine (D:\test code\test 1\node_modules\.pnpm\typescript@5.9.3\node_modules\typescript\lib\tsc.js:132133:12)
    at Object.<anonymous> (D:\test code\test 1\node_modules\.pnpm\typescript@5.9.3\node_modules\typescript\lib\tsc.js:133824:1)
    at Module._compile (node:internal/modules/cjs/loader:1554:14)

Node.js v22.14.0

🙂 Expected behavior

The function parseJsonConfigFileContent built-in _tsc.js.

Then vue-tsc can work.

Additional information about the issue

Thank you for read this.

[MartinJohns]

That sounds like an issue with vue-tsc. As far as I know parseJsonConfigFileContent wasn't part of the officially supported API.

[RyanCavanaugh]

It's still there. I don't know what's wrong with your tree-shaker.

Welcome to Node.js v22.17.1.
Type ".help" for more information.
> require('typescript').version
'5.9.3'
> require('typescript').parseJsonConfigFileContent
[Function: parseJsonConfigFileContent]

[Imgodmaoyouknow]

Thank you, I will pose a issue to vue-tsc to investigate together.

vuejs/language-tools#5707