`sections` support

[cspotcode]

Following along with several issues elsewhere on github, and would like to use trace-mapping as a (transitive) dependency in ts-node.

terser/terser#1164 (comment)
Am I understanding correctly, that this library is missing support for sections? Can this issue be used for tracking progress on that?

[jridgewell]

It's implemented via AnyMap. I hadn't documented it because I considered it to be a niche API, but I'd be happy to accept a doc PR if you want to contribute.

[cspotcode]

I see, does this mean consumers of the API must take special care to leverage it? Or can a consumer use the API as they otherwise would? I'm admittedly unfamiliar with sections and what it means. I naively assume that consumers of this API don't necessarily need to care whether or not a sourcemap uses sections.

[jridgewell]

I naively assume that consumers of this API don't necessarily need to care whether or not a sourcemap uses sections.

Correct. AnyMap can take any form of sourcemap, and will return a regular TraceMap instance. Eg, if a regular sourcemap is passed to AnyMap, it immediately returns with a new TraceMap, and if a sectioned sourcemap is passed, it converts from the section offsets into a regular sourcemap and returns that as a new TraceMap.

[cspotcode]

Nice, thanks for the explanation. I hope to have time to try it soon. I suppose this ticket can be closed.