Can compiler only emit declaration file ? #1866

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1. Mohamed Hegazy (mhegazy)

   added

   QuestionAn issue which isn't directly actionable in codeAn issue which isn't directly actionable in code

   on Jan 30, 2015
2. mhegazy commented on Jan 30, 2015

   

   Mohamed Hegazy (mhegazy)

   on Jan 30, 2015

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   There is no supported flags that would do that, only emit all or do not emit at all (--noEmit). Consider using --outDir and picking only the .d.ts files.
3. Mohamed Hegazy (mhegazy)

   closed this as completedon Apr 21, 2015
4. nojvek commented on May 17, 2017

   

   Noj Vek (nojvek)

   on May 17, 2017

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   I'm thinking of adding a --noEmitJs flag. Would you be willing to entertain that thought?
5. mhegazy commented on May 17, 2017

   

   Mohamed Hegazy (mhegazy)

   on May 17, 2017

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   I'm thinking of adding a --noEmitJs flag. Would you be willing to entertain that thought?

   if there is a compelling scenario.
6. nojvek commented on May 17, 2017

   

   Noj Vek (nojvek)

   on May 17, 2017

   Last edited by nojvek

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   Scenario: Auto-Generate typings for a pure js project

   Currently typings for js projects are manually hand maintained. A ton of typings are out of date with the actual code. Typings are kind of documentation and if they are separate from code, they will eventually get out of sync.

   with --checkJs, JS lib authors get extra benefit of validating code with jsdoc typings. Being able to auto generate just .d.ts from their existing code would make life easier. This can be done as part of the build step.

   Basically if declarations:true and noEmitJs:true, only declarations should still be generated

   Proposal:

   compilerOptions: {
     module: 'amd',
     outFile: 'build/types.d.ts',
     declarations: true,
     allowJs: true,
     checkJs: true, // optional
     noEmitJs: true,
   },
   include: [
      'src/**.js'
   ]
   

   This would just generate a single .d.ts file from the project that you can add as part of package.json. No hand maintenance.

   👍React with 👍7Reacted by Magnus Trent, busybeaver, Meowtimer, Jay Jones, Geo, SlurpTheo and Isaac Kwan
7. magnus-trent commented on Jul 17, 2017

   

   Magnus Trent (magnus-trent)

   on Jul 17, 2017

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   Useful if you only want to generate the declaration files but not compile the js. Current usage for me would be that I'm generating an Electron application. I want the d.ts files in respective directories but the js files don't need to be created because they're made during application compilation and would cause only unnecessary clutter beforehand.
8. microsoft

   locked and limited conversation to collaborators on Jun 18, 2018