From:  Brian Slesinsky <skybrian@google.com>
Date:  26 Aug 2015 08:12:21 Hong Kong Time
Newsgroup:  news.mozilla.org/mozilla.dev.js-sourcemap
Subject:  

Re: Proposal for encoding source-level environment information

NNTP-Posting-Host:  63.245.214.181

I skimmed but I'm not really following in detail. I wonder if it would make
sense to define a mapping between the compressed  "env" data structure and
a JSON format, and give a few examples? Then we can discuss what data goes
into it separately from how it gets compressed.

- Brian


On Tue, Aug 25, 2015 at 4:37 PM, Nick Fitzgerald 
wrote:

> Hi folks,
>
> I'd like to embed some information about the source-level lexical
> environment within the source map format, so that it can take its first
> baby steps towards being a Real Debugging Format(tm).
>
> This will enable:
>
> 1. Debuggers to rematerialize the source-level environment
> ​,
>  scopes
> ​,​
> and their bindings (regardless if there are corresponding scopes and
> bindings in the generated JS).
>
> 2. Debuggers to locate a binding's current value. This includes situations
> where:
>
>   * The binding was renamed in the compiled JS. For example, the binding is
> named
> ​`​
> atom?
> ​`​
> in the original source and renamed to
> ​`​
> atom_question
> ​`​
> in the compiled JavaScript. Or a minifier renames
> ​`​
> getLatestFooWidget
> ​`​
> to
> ​`
> aF
> ​`​
> .
>
>   * The binding does not have a corresponding binding in the compiled
> JavaScript. For example, the compiler inlined the binding's value after
> recognizing that the binding was never mutated.
>
> Here is the proposal, for your consideration:
>
> https://github.com/fitzgen/source-map-rfc/blob/scopes-and-bindings/proposals/env.md
>
> Feel free to discuss it on this list or on the source-map-rfc pull request:
> https://github.com/source-map/source-map-rfc/pull/4
>
> Cheers,
>
> Nick
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