confusingstraw edited a comment on pull request #70:
URL:
https://github.com/apache/incubator-flagon-useralejs/pull/70#issuecomment-804985422
ah, seems like you are right. i think it is because we only use babel in our
testing, not our building.
i just went down a rabbit hole trying to figure out where the hell that
browser detection regex stuff i noticed in the webextension came from. turns
out it was added by @poorejc , looks like it is just the inlined content of the
library. this isn't relevant in this PR, especially given the change is like
two years old at this point, but it is a shame we had to drop being "runtime
dependency free" for that browser detection stuff.
to not be entirely unhelpful, i tried to get our build system to do the
`let`/`const` transformation locally, and was able to get it working with the
following changes:
1. add `@rollup/plugin-babel` and `@babel/plugin-transform-block-scoping` as
dev dependencies
2. update our `gulpfile.js` to include the following:
```js
// near the top, with the other imports
const {babel: rollupBabel} = require('@rollup/plugin-babel');
//in the gulp.task('rollup'... plugins
commonjs({ include: /node_modules/ }),
rollupBabel({ babelHelpers: "runtime", exclude: /node_modules/,
plugins: ["@babel/plugin-transform-block-scoping"] }),
```
doing this seemed to result in a relatively small diff to the build outputs,
and transforms any `let`/`const` usage to `var`.
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