Incremental build with changes to tsconfig's target does not regenerate js files

[konpikwastaken]

TypeScript Version: 3.4.5, 3.5.0-dev.20190425

Search Terms: incremental, build, target, tsc, tsconfig

Code

bar.ts

const bar = class foo {
  private str: string;
}
export default bar;

tsconfig.json

{
... // ommitted for brevity
  "target": "esnext"
...
}

Expected behavior:
Once you build, then change the tsconfig target field to, say, commonjs, TSC should regenerate all of the output JS files.

Actual behavior:
TSC runs, but does not regenerate the JS files

It would seem that some tsconfig values should be part of the tsconfig.tsbuildinfo hash/checksum, but are not. Not sure if this is meant to be by design, but could be misleading.

[indiejoseph]

Also having this problem here, whenever I removed the output directory and regenerate, I have to delete the tsconfig.tsbuildinfo, otherwise nothing happen.

[sheetalkamat]

@indiejoseph Please open another issue if it repros with typescript@next .I don't see why you should have that behavior since we do handle outDir