Move from source-map to source-map-js

[7rulnik]

Q	A
Fixed Issues?	Fixes #7486
Patch: Bug Fix?	-
Major: Breaking Change?	-
Minor: New Feature?	—
Tests Added + Pass?	Yes
Documentation PR Link
Any Dependency Changes?	Replaced source-map with source-map-sync
License	MIT

I made the fork of source-map that introduces sync API, but still uses WASM.
You can compare changes to original versions here

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[babel-bot]

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/46557/

[7rulnik]

Node 6 failed but it's expected because WASM support was introduced in Node 8

[nicolo-ribaudo]

Unfortunately we cannot drop Node.js 6 until Babel 8 😕

[7rulnik]

@nicolo-ribaudo yep, I know.

I also maintain source-map-js which is the fork of source-map, but with algorithmic optimizations. It's 4x faster than source-map@6, but still 2x slower than source-map-sync.

So I think we need to make a choice :)

[TrySound]

@7rulnik Does source-map-js supports node 6? It makes sense to migrate to it first and the see if other improvements are necessary.

[7rulnik]

@TrySound yeah, it should. Will update this PR in few days

[onigoetz]

Hi @nicolo-ribaudo are you interested in merging this ?

@7rulnik can you update the dependency to ^1.0.0 ?

[jordanbtucker]

This will also fix an annoying issue in VS Code.

source-map@<0.7.1 has an invalid typings field in its package.json which is causing VS Code to report an error that it can't find the type declarations. This is fixed in source-map@>=0.7.1. Moving to source-map-js would eliminate the issue altogether.

[jridgewell]

All of the SourceMapConsumers have switched over to @ampproject/remapping and @jridgewell/trace-mapping. There are still some SourceMapGenerators that could be switched to source-map-js.

[7rulnik]

@jridgewell yeah. I can update PR if it makes sense and we will merge it