// ==UserScript==
// @name        $Boolean
// @author      Callum Latham <callumtylerlatham@gmail.com>
// @exclude     *
// @description Handles persistent storage of boolean values.
// ==/UserScript==
class $Boolean {
constructor(KEY, DEFAULT = true) {
// PRIVATE STATE
let value;
// PRIVATE FUNCTIONS
const getError = (message, error) => {
if (error) {
console.error(error);
}
return new Error(`[$Toggle] ${message}`);
};
const set = (_value) => {
value = _value;
if (typeof GM.setValue !== 'function') {
return Promise.reject(getError('The GM.setValue permission is required to store data.'));
}
return GM.setValue(KEY, value);
};
// PUBLIC FUNCTIONS
this.init = () => {
if (typeof GM.getValue !== 'function') {
return Promise.reject(getError('The GM.getValue permission is required to retrieve data.'));
}
return GM.getValue(KEY, DEFAULT)
.then(set);
};
this.toggle = () => set(!value);
this.get = () => value;
};
}