Adding JS Types (#1749)

Added types for some exceptions, config objects, and sleep()

pyscript.core/src/config.js

@@ -46,7 +46,15 @@ const syntaxError = (type, url, { message }) => {
 };
 
 // find the shared config for all py-script elements
-let config, plugins, parsed, error, type;
+let config, type;
+
+/** @type {Promise<any> | undefined} A Promise wrapping any plugins which should be loaded. */
+let plugins;
+/** @type {any} The PyScript configuration parsed from the JSON or TOML object*. May be any of the return types of JSON.parse() or toml-j0.4's parse() ( {number | string | boolean | null | object | Array} ) */
+let parsed;
+/** @type {SyntaxError | undefined} The error thrown when parsing the PyScript config, if any.*/
+let error;
+
 let pyConfig = $("py-config");
 if (pyConfig) {
     config = pyConfig.getAttribute("src") || pyConfig.textContent;