Update module functionality

[eslint]

Update module functionality

[nzakas]

Looking at usage patterns, I think I'd also like to make a small change:

1. Add a modules feature flag that just enables import/export declarations and switches the parser into strict mode.
2. Make sourceType = "module" turn on every ES6 feature flag, including modules.

I think that gives us both parity with Esprima and the configurability some have asked for in ESLint.

[caridy]

ha, I told you so!, lets roll with that, should be flexible enough. I wonder if the inverse will be possible. Using sourceType="module" with class disabled. This is sort of a requirement that we have at Yahoo, where we want to focus on zero-cost abstraction features only rather than all. e.g.: we want to use modules but we don't want to use let.

[nzakas]

Yup, you were right.

I think in this model, you can use sourceType="module" and then set classes to false explicitly to achieve what you want.

[caridy]

👍

[nzakas]

I'll take a stab at the feature flag, then we can attack the other pieces.

[xjamundx]

Oh I have PRs for the last 2 I can open I think...not sure how I missed this thread!

[nzakas]

Working on tests for sourceType="module"

[nzakas]

Wow, this is a really good test. Uncovered a few issues.

[nzakas]

All done!