tsconfig extend does not deep-clone compilerOptions.types

[tholewebgods]

Bug Report

🔎 Search Terms

extends tsconfig types compilerOptions Cannot find module or its corresponding type declarations svelte

🕗 Version & Regression Information

• Affected version is 4.3.2 and earlier

⏯ Playground Link

Repository with relevant code

💻 Code

MCVE: https://github.com/tholewebgods/typescript-extend-not-deep-clone-mcve

🙁 Actual behavior

The compiler does not load modules of a specific type configured via extends config when root config also specifies types.

🙂 Expected behavior

When extending from configs types shall be merged.

[MartinJohns]

Related: #27098

[RyanCavanaugh]

This is the intended behavior; if you didn't want to copy down the parent types, you'd have no way of expressing that, whereas today you can at least write what you mean. It'd be a fairly large breaking change in build system to change this now, especially since there'd be no workaround apart from editing the upstream config file (which you'd have no way of tracking down the child dependencies of).

[typescript-bot]

This issue has been marked 'Working as Intended' and has seen no recent activity. It has been automatically closed for house-keeping purposes.

[Exotelis]

@RyanCavanaugh sorry for posting here again, but I also stumbled over this behavior. Wouldn't it make sense to point this out in the documentation then? What else is excluded from inheritance then, is there a document list?