let plugins = new Map (); export const PluginType = { Header : 1, Toolbar : 2 }; export function RegisterPlugin (type, plugin) { if (!plugins.has (type)) { plugins.set (type, []); } let typedPlugins = plugins.get (type); typedPlugins.push (plugin); } export function EnumeratePlugins (type, onPlugin) { if (!plugins.has (type)) { return; } let typedPlugins = plugins.get (type); for (let typedPlugin of typedPlugins) { onPlugin (typedPlugin); } }