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Handlers are functions which load and transform files. Rosid doesn't care about how they transform them, but requires them to return a promise. The promise should resolve a string that contains the content of the transformed file.

Existing handlers

See all handlers »

Custom handler

Check out our "Writing a handler" guide to learn how to build your own handler.


 * A handler that always returns 'Hello World!'.
module.exports = function(filePath, opts) {

	return Promise.resolve('Hello World!')



  • filePath {String} Absolute path to file.
  • route {Object} Options from the route.


  • {Promise<String|Buffer>} The transformed file content.

Distributing a handler

Handlers should be distributed through npm. The recommended prefix is rosid-handler- and the package.json of your handler should at least contain the tags rosid and handler.