adding datapoint on application in code-coverage. a builtin parser-api would be ideal (and appreciate the insight on implementation difficulties). lacking that, the next best alternative i've found is acorn (based on esprima), available as a single, embedabble file runnable in browser:
```shell curl https://registry.npmjs.org/acorn/-/acorn-6.3.0.tgz | tar -O -xz package/dist/acorn.js > acorn.rollup.js ls -l acorn.rollup.js -rwxr-xr-x 1 root root 191715 Sep 15 16:49 acorn.rollup.js ``` i recently added es9 syntax-support to in-browser-variant of istanbul by replacing its aging esprima-parser with acorn [1]. ideally, i hope a standardized ast will be available someday, and get rid of acorn/babel/shift altogether (or maybe acorn can become that standard?). even better, is if [cross-compatible] instrumentation becomes a common bultin-feature in engines, and get rid of istanbul. chrome/puppeteer's instrumentation-api is not yet ideal for my use-case because it currently lack code-coverage-info on branches (which istanbul-instrumentation provides). [1] istanbul-lite - embeddable, es9 browser-variant of istanbul code-coverage https://kaizhu256.github.io/node-istanbul-lite/build..beta..travis-ci.org/app/ On Sun, Sep 15, 2019 at 9:08 AM David Teller <[email protected]> wrote: > In theory, it should be possible to have both modes, if the parser is > designed for it. Unfortunately, that's not the case at the moment. > > Mozilla has recently started working on a new parser which could be used > both by VMs and by JS/wasm devs. It might help towards this issue, but > it's still early days. > > Cheers, > David > > On 15/09/2019 13:09, Jack Works wrote: > > Happy to see standard ast in binary ast proposal. > > > > For compiler, it can have a "slow" mode when parsing with this parser > > API and still use fast code generation in other cases. But unfortunately > > it seems there are much more work than I think to provide such an API. > > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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