Provide metadata about TypeScript's available refactorings and quick fixes

[mjbvz]

Problem

We are working on improving discoverability of JS/TS refactorings and quick fixes in VS Code. As part of this, we'd like to put together documentation and a new contribution points that lists out the code actions provided by TypeScript

At the moment, the only way I know to determine this list is to look through the TypeScript codebase.

Proposal

We'd like a way to get metadata about all the current TS quick fixes and code actions. The main information we are interested in:

• Identifier for the quick fix
• Human readable name / description for the quick fix
• (possibly) A way to map this description to the localized description that TS ships with

Two ideas on how this could be exposed:

• In the TS repo, check in a generated CodeActions.json file. This file would be updated whenever the refactorings or quick fixes change. VS Code would not need this to be published as part of the TypeScript package

• Expose a command line option or tool to dump out all known refactorings and quick fixes.

/cc @orta Ryan mentioned you may also find this useful for the website

[mjbvz]

Here's how we plan on using this information on the VS Code side: microsoft/vscode#82718

[orta]

Ah! Great - linking to microsoft/TypeScript-Website#48 - I can grab you this in a structured way so that I can use it for the site

[orta]

OK cool, looks like I can extract most of the things you want https://gist.github.com/orta/3f56c1aec87a419d2b4a2a542f1f0d5b - WIP branch

[orta]

Looks like there's no changes on VSCode side yet, punting to 4.x - will also try think about whether this info could get into the website now it's close to wrapping