## Purplemonkey API only the additional api from violent monkey are listed. other api are same to the violent monkey in the same version.
### GM_messageExtension(id, payload) send message to other extension's `browser.runtime.onMessageExternal` handler.
* id: the id of the destination extension. * payload: the data to send. must be structure clonable. * return: a promise resolve to the response or reject to error.
to use this api, you have to add `@connect web-extension://id` in the userscript's meta field. where id is the extension that you want to send message with. the special `web-extension://*` allow to connect to all the other extensions.
### GM_webextEval(code, args) eval string or function in violent monkey background script.
* String(code): the code is call as `(function (...args) {return eval(code)})(...args)`, so the last statement is return.
* Function(code): code is stringify and reconstructed as function in background. stringify so any closure will not work.
if this is a method, you should make sure that it could be stringify and reconstruct correctly.
async could work.
* args: an argument array that structure clonable.
* return: a promise resolve to result or reject to error.
