## Bug
The `next build` command is silently overriding the user's tsconfig when
it shouldn't be; this results in mismatched behavior between `tsc
--noEmit` and `yarn build` and user confusion.
For example, a configuration option like `"moduleResolution":
"nodenext"`, which is preserved and respected by `next dev`, will be
silently overridden to `"moduleResolution": "node"` during `next build`.
This change:
- Fixes#38854
- (probably fixes) #45452 (I have not verified)
- (probably fixes) #41189 (I have not verified)
## Details
Next has a concept of both _defaults_ and _permitted options_ when
modifying/validating the user's tsconfig. The user's config is only
modified if it does not match the _permitted options_. This means that
if the user has specified a permitted value like `"moduleResolution":
"nodenext"`, it will not be overwritten in the user's config file.
However, there was some logic in `runTypeCheck.ts` that did not
adequately capture this nuance – instead, it spread all of the defaults
into the tsconfig it was building before running typecheck, which meant
that if a user had specified an option that was _permitted_ but
_non-default_, it would be overwritten, silently, during `yarn build`
only.
Because Next is already (1) rewriting the TSconfig in
`writeConfigurationDefaults` when the user's config doesn't line up with
what we're expecting and (2) verifying the user's TSConfig remains
correct (in `verifyTypeScriptSetup`) during a `next build`, I believe
that it is safe to remove this config-steamrolling behavior.
## Documentation / Examples
I believe this is strictly a bugfix; it updates the behavior of `next
build` to conform to the same configuration behavior exhibited by `tsc
--noEmit` and `next dev`. Since this is already the user expectation, it
should not require documentation changes.
---------
Co-authored-by: Shu Ding <g@shud.in>
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>
