Added support for outDir in Fable compiler

[ncave]

• Added support for --outDir in Fable compiler.

[alfonsogarciacaro]

[alfonsogarciacaro]

I just noticed this is not copying JS files (not translated from F#) to outDir as fable-splitter used to do, not sure if it's much of an issue.

[ncave]

@alfonsogarciacaro Yes, intentionally. Technically it can be easily done by modifying the code here and copying the (non-F#) import to the target location, something like that:

    let targetRelPath = getTargetRelPath importPath targetDir projDir outDir
    if not (importPath.EndsWith(".fs.js")) then
        <copy file from importPath to outDir + targetRelPath>
    targetRelPath

But the problem is, we're not rewriting the (non-F#) import's own imports, so that's not going to work properly.

Instead, if we need to walk all (non-F#) imports and export them to output, the easiest solution is to simply run TypeScript or a bundler (rollup/webpack) on the Fable output.

[alfonsogarciacaro]

Ah, true. Makes total sense, thanks for the explanation!