You will have to import those from another polyfill like core-js individually. @babel/polyfill? @BobbyMcWho Thanks for pointing this out. Hey @RyanEwen!
If you need to use a proposal that is not Stage 4, @babel/polyfill will not automatically import those for you. Suggestions cannot be applied while the pull request is closed. To summarize: I think useBuiltIns: 'usage' is a safer choice, in general, that is very easy to change if you know what you're doing. You can either You signed in with another tab or window. And from my experience, it still has some edge-cases (because core-js detects relevant import by statically analyzing, so it could not predict what you could have in a runtime), so that creates cases when you still need to add some polyfills by hand. Perhaps, we remove the corejs option in runtime plugin.
@babel/polyfill is deprecated. Only one suggestion per line can be applied in a batch. From here: Until Babel 7.3, useBuiltIns: usage was unstable and not fully reliable: many polyfills were not included, and many others were added without their required dependencies. To be honest, I'm not sure what happened to the specs, looks like a configuration issue, and I believe master branch is failing too, @PikachuEXE reviewing and merging, I believe.
Made a PR where I added the upgrade instructions to the changelog, feedback appreciated: #2107. Why would it be a breaking change?
I include the polyfill into pages like so:
This will emulate a full ES2015+ environment (no < Stage 4 proposals) and is intended to be used in an application rather than a library/tool. Suggestions cannot be applied from pending reviews. The polyfill is provided as a convenience but you should use it with @babel/preset-env and the useBuiltIns option so that it doesn't include the whole polyfill which isn't always needed. We may work towards including this as separate files in @babel/polyfill soon. Fully agree, plus create-react-app followed that same path.
However I see that this is deprecated in favor of using core-js and regenerator-runtime directly. I am working with an older site that does not have any sort of build system in place and consists of many js files that will most certainly step on each other's feet if concatenated into a single bundle. This means you can use new built-ins like Promise or WeakMap, static methods like Array.from or Object.assign, instance methods like Array.prototype.includes, and generator functions (provided you use the regenerator plugin). We may work towards including this as separate files in @babel/polyfill soon. This suggestion has been applied or marked resolved. Because this is a polyfill (which will run before your source code), we need it to be a dependency, not a devDependency. This pr adds the required modifications to support core-js@3. babel/polyfill is deprecated and using core-js directly is the way now.
@somebody32 The document you linked seems to indicate that it needs to be removed.
@jaredbeck it is here: https://github.com/rails/webpacker/pull/2031/files#diff-13f93725bce9fb269a61b40f3f4f10deR33. Sorry if it does already and I'm just not seeing it.
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