ts will try to compile import files from a folder without reference or include

[HolgerJeromin]

🔎 Search Terms

module import declaration

🕗 Version & Regression Information

• This is the behavior in every version I tried 3.3 and 5.9-nightly

⏯ Playground Link

https://github.com/HolgerJeromin/ts-issues/tree/ts-61440

💻 Code

Folder jsModule with tsconfig and one module file:

file jsModule/jsModule.ts

export class TreeView {
  constructor() {
    Promise.allSettled([]);
  }
}

jsModule/tsconfig.json

{
  "compilerOptions": {
    "composite": true,
    "module": "ES2020",
    "target": "ES2015",
    "lib": ["DOM", "ES2015", "ES2020"],
    "strict": true
  },
  "files": ["jsModule.ts"]
}

And a folder src:

file src/main.ts

import { TreeView } from "../jsModule/jsModule.js";
const _TreeView = new TreeView();

src/tsconfig.json

{
  "$schema": "http://json.schemastore.org/tsconfig",
  "compilerOptions": {
    "module": "ES2022",
    "target": "ES2022",
    "lib": ["ES2015", "DOM"],
    "types": [],

    "strict": true
  },
  "files": ["main.ts"]
}

Note: No ES2020 lib.

🙁 Actual behavior

Build jsModule folder:

.\node_modules\.bin\tsc.cmd --build  .\jsModule\ --verbose

Results in emit of correct jsModule/jsModule.js and .d.ts file.
Build src folder:

.\node_modules\.bin\tsc.cmd --build  .\src\ --verbose

fails to compile because it uses not the correct tsconfig:

.\node_modules\.bin\tsc.cmd --build  .\src\ --verbose  --explainFiles
[16:15:17] Projects in this build: 
    * src/tsconfig.json

[16:15:17] Project 'src/tsconfig.json' is out of date because buildinfo file 'src/tsconfig.tsbuildinfo' indicates that program needs to report errors.

[16:15:17] Building project '/ts-issues/src/tsconfig.json'...

jsModule/jsModule.ts:3:13 - error TS2550: Property 'allSettled' does not exist on type 'PromiseConstructor'. Do you need to change your target library? Try changing the 'lib' compiler option to 'es2020' or later.

3     Promise.allSettled([])
              ~~~~~~~~~~

node_modules/typescript/lib/lib.es5.d.ts
  Library referenced via 'es5' from file 'node_modules/typescript/lib/lib.es2015.d.ts'
node_modules/typescript/lib/lib.es2015.d.ts
  [...]
node_modules/typescript/lib/lib.decorators.d.ts
  Library referenced via 'decorators' from file 'node_modules/typescript/lib/lib.es5.d.ts'
node_modules/typescript/lib/lib.decorators.legacy.d.ts
  Library referenced via 'decorators.legacy' from file 'node_modules/typescript/lib/lib.es5.d.ts'
jsModule/jsModule.ts
  Imported via "../jsModule/jsModule.js" from file 'src/main.ts'
src/main.ts
  Part of 'files' list in tsconfig.json

Found 1 error.

🙂 Expected behavior

The build failure is surprising.
Expected would be one of

• The files are not included (or referenced) in src/tsconfig.json so they should not be rebuild (but only .d.ts files consumed) or
• if this needs to be rebuild it should be correctly based on its tsconfig.json

Additional information about the issue

With my real code these folders are different VS 2022 projects and therefore have no references.
Instead I have many different tsconfig.json files for the esm files. So wildly importing some ts files into the compile will never get a reasonable output. (but break the output js files in imported folder).

Found #15272 but we had no references back in 2017.
Perhaps is this a simplified version of #58353

[MartinJohns]

• The files are not included (or referenced) in src/tsconfig.json so they should not be rebuild (but only .d.ts files consumed) or

This is working as intended. The included files are the starting point of the compilation, but whatever local files you import become part of the compilation.

[RyanCavanaugh]

The files are not included (or referenced) in src/tsconfig.json so they should not be rebuild (but only .d.ts files consumed)

You need to use project references if you want this to happen

[typescript-bot]

This issue has been marked as "Working as Intended" and has seen no recent activity. It has been automatically closed for house-keeping purposes.

[HolgerJeromin]

I had compile problems when using project references in my very complex monorepo.

So I moved my .ts files out of the way by using outDir so the consumer is not able to find source files to compile...

Thanks for your feedback.