function preprocess (ast : AST, options : object ) : AST (optional) insertPragmaĪ plugin can implement how a pragma comment is inserted in the resulting code when the -insert-pragma option is used, in the insertPragma function. The preprocess function can process the AST from parser before passing into print function. The API, via the pluginSearchDirs and plugins options: prettier. Tip: You can set -plugin-search-dir or -plugin options multiple times. The CLI, via -plugin-search-dir and -plugin: prettier -write main.foo -plugin-search-dir=./dir-with-plugins -plugin=prettier-plugin-foo When plugins cannot be found automatically, you can load them with: should be replaced by a name, read more about NPM scope. Plugin package names must start with or prettier-plugin- or to be registered. Plugins are automatically loaded if you have them installed in the same node_modules directory where prettier is located. For additional languages you’ll need to install a plugin. The core prettier package contains JavaScript and other web-focused languages built in. Prettier’s own implementations of all languages are expressed using the plugin API.

Plugins are ways of adding new languages or formatting rules to Prettier.

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