Option 'noEmit' cannot be specified with option 'incremental'

Question

I am developing a next.js app. It has the following tsconfig.js

{
  \"compilerOptions\": {
    \"target\": \"ES2018\",
    \"module\": \"esnext\",
          


        

Answer 1

TS 4.0+

--incremental with --noEmit is possible now:

"compilerOptions": {
  "noEmit": true,
  "incremental": true,
  // "tsBuildInfoFile": "/tmp/my-proj/tsbuildinfo" // custom build info file path
  // ...
}

The build info file is emitted even with noEmit. You can set its explicit location via --tsBuildInfoFile. Otherwise outDir - if still set - or tsconfig.json project root is taken as emit directory.

Older versions (workaround)

  "compilerOptions": {
    "incremental": true,
    "declaration": true,
    "emitDeclarationOnly": true, // to emit at least something
    // "noEmit": true,
    // ...
    
    // Either set overall output directory
    "outDir": "dist",
    //  or separate locations for build file and declarations 
    // "declarationDir": "dist"
    // "tsBuildInfoFile": "/tmp/my-proj/tsbuildinfo"
  }

More info

• Allow noEmit and composite together in 3.7 #33809
• .tsbuildinfo file should be created when the noEmit flag is enabled #30661