When passed directly to Babel, you can just pass the objects object. Easily use a set of plugins by using or creating a preset .Source map is supported , so you can easily debug compiled code.Babel tries to follow the ECMAScript standard as much as possible.

Please refer to the interactive setup guide for the specific configuration method .This article will show you how to compile JavaScript code that uses the ES2015+ syntax into code for the current browser. In general, these options support a common pattern approach where each pattern can beImportantly, if either of these are used, Babel requires that the filename option be present, and will consider it an error otherwise.Babel’s configuration merging is relatively straightforward. Note that the @jsx React.DOM pragma has been deprecated as of React v0.12. Install by the following command:You can directly in JavaScript require it and so use it as follows:As an end user, you may want to install other tools as @babel/corean interface, and can be well integrated in your development process. If you want to use it to compile JavaScript or Typescript, it has to be explicitly defined by adding {"^.+\\. For instance:would enable the two plugin for files in src, but two would still execute between one and three.By default, Babel expects plugins to have a babel-plugin- or babel-preset- prefix in their name. This option is useful for “blacklisting” a transform like @babel/plugin-transform-regenerator if you don’t use generators and don’t want to include regeneratorRuntime (when using useBuiltIns) or for using another plugin like fast-async instead of Babel’s async-to-gen. useBuiltIns "usage" | "entry" | false, defaults to false. Compile ES2015 classes to ES5 See the default value of that option for more info.Default without minified: (val) => opts.comments || /@license|@preserve/.test(val)A function that can decide whether a given comment should be included in the output code from Babel.A hard-coded ID to use for the module. So you don't need to specify the syntax plugin if the corresponding transform plugin is used already.If the plugin is on npm, you can pass in the name of the plugin and babel will check that it's installed in You can also specify an relative/absolute path to your plugin.This means if two transforms both visit the "Program" node, the transforms will run in either plugin or preset order.It is important to remember that with presets, the order is Both plugins and presets can have options specified by wrapping the name and an options object in an array inside your config.For specifying no options, these are all equivalent:To specify an option, pass an object with the keys as the option names.Settings options for presets works exactly the same:The simple plugin that reverses names (from the homepage): This value is used as the key when resolving “env” configs, and is also available inside configuration functions, plugins, and presets, via the api.env() function.Default: path.resolve(opts.root, “babel.config.js”), if it exists, false otherwisePlacement: Only allowed in Babel’s programmatic optionsDefaults to searching for a default babel.config.js file, but can be passed the path of any JS or JSON5 config file.Default: true as long as the filename option has been specifiedPlacement: Allowed in Babel’s programmatic options, or inside of the loaded “configFile”. export BABEL_ENV=production 您的命令 Windows. This can be useful in contexts where ordering is important, but a separate condition is needed to decide if something is enabled. These options are only allowed as part of Babel’s programmatic options, so they are primarily for use by tools that wrap around Babel, or people calling babel.transform directly. @babel/preset-env also does the same for its “useBuiltIns” option.
If you want to convert the code there are other ES2015+ features. So you don't need to specify the syntax plugin if the corresponding transform plugin is used already. This modular design allows each tool to be designed for a specific use case. Cannot be used alongside getModuleId.Given the babel-generated module name, return the name to use.

Transform plugins will enable the corresponding syntax plugin so you don't have to specify both. Description. A programmatic option will override a config file one.true will enable searching for configuration files relative to the “filename” provided to Babel.A babelrc value passed in the programmatic options will override one set within a configuration file.Note: .babelrc files are only loaded if the current “filename” is inside of a package that matches one of the “babelrcRoots” packages.Placement: Allowed in Babel’s programmatic options, or inside of the loaded config File. Instead of adding all the plugins we want, we can use “preset” instead of a pre-set set of plugins.Just like using plugins, you can also create your own presets and share any plugin combinations you need. Importantly, the plugins array as a whole doesn’t just replace the top-level one.