How to configure tsconfig.json to output files from multiple source folders to single flat outDir?

Question

I have multiple typescript projects (e.g. client and server), which share some common functionality (located in a common fold

Answer 1

And now we have the support for project references in Typescript 3.0 (i.e. cascade build of multiple Typescript projects). We can also control the output location of the tsc builds.

https://blogs.msdn.microsoft.com/typescript/2018/07/30/announcing-typescript-3-0/#project-references

If a Typescript project 'bar' uses project 'foo', here is how you chain them:

// ./src/bar/tsconfig.json
{
    "compilerOptions": {
        // Needed for project references.
        "composite": true,
        "declaration": true,

        // Other options...
        "outDir": "../../lib/bar",
        "strict": true, "module": "esnext", "moduleResolution": "node",
    },
    "references": [
        { "path": "../foo" }
    ]
}

Thanks, TS guys!