Source maps

[conradz]

As far as I can tell, there is currently no way to generate source maps when using this. It would be great if this would support source maps with an API similar to escodegen's.

[michaelficarra]

This will depend on shapesecurity/shift-spec#7 being accepted. Otherwise, we'd have to figure out some other way to specify source locations.

[michaelficarra]

This is now blocked by #2.

[bakkot]

I don't think this is blocked by anything now. Given the current API to parseScriptWithLocation, the interface should presumably be a third, optional parameter (or another entry point) taking a [Weak]Map from nodes to locations.

Edit: Or possibly (Map, file name) pairs, given that source maps can map multiple input files to one output.