This option, combined with the 'root' value, defines how BabelĬhooses its project root. Type: 'root' | 'upward' | 'upward-optional'

The base directory when checking for the default 'configFile' value.

To determine the conceptual root folder for the current Babel project. The initial path that will be processed based on the 'rootMode' Placement: Only allowed in Babel's programmatic options Nested configuration objects that apply depending on the configuration. Types of configuration files, and those configuration files can have various Loading configuration can get a little complex as environments can have several Specifying cloneInputAst: false can improve parsing performance if the input AST cloneInputAst īy default ansformFromAst will clone the input AST to avoid mutations.

To cache the AST structure will take significantly more space. It and because we'd like to eventually add a caching layer to Babel. Note: This option is not on by default because the majority of users won't need Would be a chain of multiple transform passes, along the lines of ast īabel's default is to generate a string and a sourcemap, but in someĬontexts it can be useful to get the AST itself. Use ast: true to get the AST directly in order to avoid doing unnecessary work.

In some contexts where multiple calls to BabelĪre being made, it can be helpful to disable code generation and instead code īabel's default return value includes code and map properties with the Used as the default value for Babel's sourceFileName option, and usedĪs part of generation of filenames for the AMD / UMD / SystemJS module transforms. If this option is omitted, Babel will behave as if babelrc: false has been set.ĭefault: path.relative(opts.cwd, opts.filename) (if 'filename' was passed) babelrc files are loaded relative to the file being compiled.

Options like 'test', 'exclude', and 'ignore' require the filename for string/RegExp matching.

Some plugins may require the presence of the filename. The three primary cases users could run into are: The filename is unknown, because a subset of options rely on the filename The filename is optional, but not all of Babel's functionality is available when The filename associated with the code currently being compiled, if there is one. They will skip compilation of ES modules into CommonJS modules. Would allow plugins and presets to decide that, since ES modules are supported,

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