Allow --noEmit to override incremental: true from tsconfig.json

[dandv]

Search Terms

noEmit incremental override type-check

Suggestion

If --noEmit is specified on the command line, ignore the incremental: true setting from tsconfig.json.

Use Cases

I want to have a type-check npm script that runs tsc --noEmit, only for type checking. Whether incremental was set to true in tsconfig.json, shouldn't prevent that, because this isn't a build.

Examples

Currently, this leads to

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

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.

[RyanCavanaugh]

@sheetalkamat thoughts?

[sheetalkamat]

While working on #38853 i did consider this and i think it would be ok to write tsbuildInfo file when --noEmit is specified. But we should handle difference between running
tsc --noEmit and tsc where tsbuild info file remains same, and hence had decided to file separate PR for this.