chore: build/transpile itowns to specific targets.

[gchoqueux]

Description

With babel it's possible to transpile itowns to specific targets. (visiting).
I would like target to specific browser using browserslist.

Questions

• For example, the possible targets could be browsers supporting ES6.
• In webpack.config.js there is this comment (see bellow), I think it's obsolete, then we could remove target option { modules: false }, WDYT?

/*
   configuring babel:
   - when babel runs alone (for `test-unit` for instance), we let him deal with
   ES6 modules, because node doesn't support them yet (planned for v10 lts).
   - however, webpack also has ES6 module support and these 2 don't play well
   together. When running webpack (either `build` or `start` script), we prefer
   to rely on webpack loaders (much more powerful and gives more possibilities),
   so let's disable modules for babel here.
*/

[tbroyer]

How about putting the browserslist configuration in the package.json or a .browserslistrc file, and then (possibly) use the eslint-plugin-compat plugin to also detect usage of features that are not supported by the target browsers? (you'd probably have to "annotate" non-client files with /* eslint-env node */ to disable the plugin where it doesn't make sense, such as the webpack.config.js)

[tbroyer]

This query (which is equivalent to "defaults") includes Opera Mini which, among others things, doesn't support WebGL.

[Desplandis]

Done in #2296 and #2252.
We can close this PR.