Pablo-WMDE added a comment.
WARNING: babel config sometimes cached between builds https://github.com/vuejs/vue-cli/issues/3275#issuecomment-453038110 babel.config.js configuration (see https://cli.vuejs.org/guide/browser-compatibility.html#usebuiltins-usage) `useBuiltIns: 'usage'` is the default, through @vue/babel-preset-app pulls in plugins that satify vue/vuex & our source code `debug: true` is a thing, shows plugins & config used in the end `ignoreBrowserslistConfig: true` actually makes ~init.js [a little] bigger, i.e. browserlist has effect "There are many misconceptions in the community, as well, that modern browsers "don't need" polyfills, or that polyfills/shims merely serve to add missing features - in fact, they often repair broken implementations, even in the most modern of browsers. The best practice thus remains to unconditionally and synchronously load all polyfills/shims, despite the bundle size cost this incurs." https://webpack.js.org/guides/shimming/ These are the implied polyfills for vue/vuex https://github.com/vuejs/vue-cli/blob/c5f1d20a75ee77559fdec51bedaeb72cb15b3f41/packages/%40vue/babel-preset-app/index.js#L3 definition of polyfill vs transform https://medium.com/@jcse/clearing-up-the-babel-6-ecosystem-c7678a314bf3 tl,dr: "whether or not you can reimplement the feature today, in ES5" evan & linus on useBuiltIns https://github.com/vuejs/vue-cli/issues/1248#issuecomment-388117018 ff. evan's wise words on transpileDependencies https://github.com/vuejs/vue-cli/issues/1568#issuecomment-406419267 Configuring babel for monorepos is quite a feat _should_ you want limited reuse (which we don't ATM) https://babeljs.io/docs/en/config-files#monorepos Result: - the premise "babel does not use .browserlistrc to decide which polyfills to include" is not accurate Possible actions (somewhat either/or considering it all ends up in ResourceLoader): - babel as a separate entry point could avoid shipping global polyfills twice -> does this still make sure the (babel-runtime) namespaced polyfills exist, e.g. instance methods? - manage the polyfills for init independently (maybe through `useBuiltIns: 'entry'`) that are currently implied by @vue/babel-preset-app to be all of vue's TASK DETAIL https://phabricator.wikimedia.org/T226488 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Pablo-WMDE Cc: Pablo-WMDE, darthmon_wmde, Aklapper, Michael, Nandana, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, _jensen, rosalieper, Wikidata-bugs, aude, Lydia_Pintscher, Mbch331
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