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tsconfig usage tip

rootDir​

Longest common path non-declaration input files.
Inferred value for rootDir is src.

MyProj
├── tsconfig.json
├── src
│   ├── a.ts
│   ├── b.ts
│   ├── sub
│   │   ├── c.ts
├── types.d.ts

If outDir was dist, Typescript would write this tree:

MyProj
├── dist
│   ├── a.js
│   ├── b.js
│   ├── sub
│   │   ├── c.js

info

rootDir doesn't affect which files become part of the compilation. rootDir have to include all files need to be transpiled to .js

MyProj
├── tsconfig.json
├── src
│   ├── a.ts
│   ├── b.ts
│   ├── sub
│   │   ├── c.ts
├── types.d.ts
├── hello.ts // error!
hello.ts' is not under 'rootDir' '%PROJECT_DIR%/src'. 'rootDir' is expected to contain all source files.
The file is in the program because:
Matched by default include pattern '**/*'

Reference​