Files outside rootDir emit files adjacent to themselves if they are imported by an included file

Bug Report

The documentation for rootDir states that

Note that TypeScript will never write an output file to a directory outside of outDir, and will never skip emitting a file. For this reason, rootDir also enforces that all files which need to be emitted are underneath the rootDir path.

If any included file imports a ts file outside of rootDir, a declaration file is generated for that imported file and emitted adjacent to it. noEmitOnError needs to be either omitted or set to false, or the -b flag needs to be specified for this to occur.

🔎 Search Terms

noEmitOnError, unwanted declaration files, emits outside outDir, emits outside declarationDir

🕗 Version & Regression Information

On all versions matching ^4.2.4 and on the current nightly, nonexhaustive, haven't checked others

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about tsconfig.json behaviour and commandline behaviour

⏯ Playground Link

https://github.com/gtm-nayan/ts-no-emit-wat/
Sorry, couldn't figure out multiple files in the playground or the workbench.

💻 Code

🙁 Actual behavior

Declaration files emitted outside of output directory.

🙂 Expected behavior

No files should be emitted outside of the specified output directory.

Bắt đầu bằng cách tái hiện hành vi trong repository được liên kết, tập trung vào một tệp bên ngoài rootDir được một tệp được đưa vào import và phần phát sinh declaration emit. Sau đó, lần theo cách trình biên dịch TypeScript xử lý rootDir, outDir, declarationDir và noEmitOnError; công việc được xem là hoàn tất khi không có tệp khai báo nào được phát ra bên ngoài thư mục đầu ra đã cấu hình.