sourceType: "module" with ES5 target?

[dead-claudia]

It'd be helpful with Rollup, if you don't want to use Babel. Related to eslint/espree#289.

[dead-claudia]

I filed it in both places because this is an Acorn limitation that also requires some support on Espree's end. (I use ESLint.)

[RReverser]

Various source types is a feature that is present only in ES6. It would be a violation of grammar to just rip apart some features from various versions and concatenate together, and no one would really want to support such custom flavor of JavaScript.

Please see #343, #241 and I believe there were few other related issues for previous discussions on this.

[ryanelian]

I am trying to write a script validator which returns true when a module is written in ES5 (to be consumed by webpack, which obviously must be a module).

Seeing that this issue was closed two years ago, is there any way today to do this with acorn?

[dead-claudia]

@ryanelian Just walk the parsed AST, checking against a whitelist.