A path to an import map, an inline import map object, or an array containing any combination of the above.

If true, instructs Rollup to mark imports declared in the provided import maps as external. If false the imports are bundled. If not specified it will default to false.

Set the base url from which the relative-URL-like addresses are resolved.

If not provided, the base url will the location of the import map if an import map path is provided, or the current working directory if not.