![]() Outputs to console.log the polyfills and transform plugins enabled by preset-env and, if applicable, which one of your targets that needed it. babel-loader, and thus it is not recommended to pass caller data yourself - The passed caller may overwrite the one from bundler plugins and in the future you may get suboptimal results if bundlers supports new module features. Generally caller data will be specified in the bundler plugins (e.g. modules: "auto" īy default uses caller data to determine whether ES modules and module features (e.g. If you are using a bundler with Babel, the default modules: "auto" is always preferred. Use this only if you intend to ship native ES Modules to browsers. Setting this to false will preserve ES modules. Note that cjs is just an alias for commonjs. "amd" | "umd" | "systemjs" | "commonjs" | "cjs" | "auto" | false, defaults to "auto".Įnable transformation of ES module syntax to another module type. loose Įnable "loose" transformations for any plugins in this preset that allow them.Ĭonsider migrating to the top level assumptions available since Babel 7.13. spec Įnable more spec compliant, but potentially slower, transformations for any plugins in this preset that support them. ![]() This option merges the features of without having to use another preset. Depending on your targets and on how many modern syntax you are using, this can lead to a significant size reduction in the compiled app. ![]() When this option is enabled, tries to compile the broken syntax to the closest non-broken modern syntax supported by your target browsers. From this grouping information, Babel enables or disables each group based on the browser support target you specify to targets option. These groups can be large and include a lot of edge cases, for example "function arguments" includes destructured, default and rest parameters. These optimizations will be enabled by default in Babel 8īy default, (and Babel plugins in general) grouped ECMAScript syntax features into collections of closely related smaller features. ![]()
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