"Any rollup experts know how to transpile spread? . Seems to be working properly, closing this one out. This rollup plugin automatically deduplicates those helpers, keeping only one copy of each one used in the output bundle. In #javascript Babel is used to transpile and polyfill your code that converts ES6 code back to ES5 to ensure browser compatibility for all users. Connect and share knowledge within a single location that is structured and easy to search. How to transpile output of rollup-plugin-vue to ES5 using rollup-plugin-babel? Everything else is converted into ES5 code and this is breaking support for internet explorer 11 for which I must include support for. The main strategy people adopt is having 2 builds: You can use an environment variable like process.env.IS_LEGACY_BUILD (the name is arbitrary - Sapper calls it SAPPER_LEGACY_BUILD) to toggle this behavior between builds. I had the same issue after upgrade to the latest versions of rollup-plugin-vue, rollup-plugin-babel & etc. I found the culprit. I've been trying to get my application to transpile lit-html to ES5 but have had no luck with this. Check out Bundling and Tree-Shaking with Rollup and ECMAScript 2015 Modules for more details. Rollup.js offers a plugin which uses Bubl to transpile to ES5. I know what you're thinking, all that work and it didn't actually change anything but that is not actually true. // // rollup.config.js // other imports import svelte from 'rollup-plugin-svelte'; import babel from 'rollup-plugin-babel'; . It seems to be that code from vue-component-compiler is not transpiled to ES5 partially. Here are the basic steps for transpiling your code with Babel: 1. This could be used within a Gulp.js task or any other process: Alternatively, you can use a rollup.watch() function to trigger handler functions when source files are modified. In my actual app there are several files that use ESM import/export, however I have verified that I can reproduce the problem with a single, simplified example file. This repository has been archived by the owner on Jan 18, 2022. For example: watch options can be set within the configuration file. Install it with npm: rollup.config.js must be updated to include and use the plugins in a new plugins array: Youll now find day.js code has been included within build/bundle.js. This tutorial explains how to use typical configurations within your own projects. multiple entries + preserveModules with rollup and rollup-plugin-babel - why are all helpers not included in _rollupPluginBabelHelpers.js?
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