Inline source maps

[mhegazy]

Support for inline source maps. As referenced in #2233, this change allows us to emit single file with source maps instead of having a separate file.

[mhegazy]

@frankwallis you might find this helpful.

[frankwallis]

thanks!

[mhegazy]

Also pinging @teppeis and @basarat for typescript-simple that can use this change.

[DanielRosenwasser]

Maybe make this a Debug.fail

[DanielRosenwasser]

Use let consistently

[CyrusNajmabadi]

Is the algorithm provided basically saying:

1. We have a string.
2. We want to consider the UTF8 encoding of that string.
3. We want to take that encoding and convert it to Base64?

If so, i would personally prefer breaking out the two parts of this process. The UTF8 encoding, and the Base64 conversion.

Note: MDN already covers a good way to do this:
https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/btoa#Unicode_Strings

function utf8_to_b64( str ) {
  return window.btoa(unescape(encodeURIComponent( str )));
}
or
function b64EncodeUnicode(str) {
    return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g, function(match, p1) {
        return String.fromCharCode('0x' + p1);
    }));
}

Now, if we don't have access to these functions in Node or Chakra, we could still do the above steps, just individually. i.e. break up a string into utf8 bytes. Then convert those bytes to Base64. I think this would be far easier to understand (and verify).

[mhegazy]

mm. let me try this out then. i remember there was a reason why i did not do that :)

[mhegazy]

So btoa is not available on node, and escape is not available on chakra :), so there is not an easy way to use these. I did split them into two functions, and added unit tests as well.

I have also handled --inlineSourceMap to be a parallel to --sourceMap instead of a dependent.

The reason covertToBase64 is in utilities is to allow for targeted unit tests. I have limited compiler baselines to limt the noise in .js files as the map is actually included in the .js file.

[DanielRosenwasser]

:%s/correctelly/correctly/g

[vladima]

LGTM

[vladima]

Can you also update transpile function to use inlineSources\inlineSourceMaps?

[teppeis]

@mhegazy duplicated lines in wiki https://github.com/Microsoft/TypeScript/wiki/Roadmap/_compare/bfc82f102a462b485ed5fbebf04a457eb76987a7...307473332000299d8fe56b70460deca31b5e1f03#diff-0fa168c44ae96a89e7ba2d227c7c545cR44

[mhegazy]

thanks @teppeis. fixed