62 lines
1.6 KiB
JavaScript
62 lines
1.6 KiB
JavaScript
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'use strict';
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// Heavily inspired by node's `internal/errors` module
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const kCode = Symbol('code');
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const messages = new Map();
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/**
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* Extend an error of some sort into a DiscordjsError.
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* @param {Error} Base Base error to extend
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* @returns {DiscordjsError}
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*/
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function makeDiscordjsError(Base) {
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return class DiscordjsError extends Base {
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constructor(key, ...args) {
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super(message(key, args));
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this[kCode] = key;
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if (Error.captureStackTrace) Error.captureStackTrace(this, DiscordjsError);
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}
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get name() {
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return `${super.name} [${this[kCode]}]`;
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}
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get code() {
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return this[kCode];
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}
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};
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}
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/**
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* Format the message for an error.
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* @param {string} key Error key
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* @param {Array<*>} args Arguments to pass for util format or as function args
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* @returns {string} Formatted string
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*/
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function message(key, args) {
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if (typeof key !== 'string') throw new Error('Error message key must be a string');
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const msg = messages.get(key);
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if (!msg) throw new Error(`An invalid error message key was used: ${key}.`);
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if (typeof msg === 'function') return msg(...args);
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if (!args?.length) return msg;
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args.unshift(msg);
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return String(...args);
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}
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/**
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* Register an error code and message.
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* @param {string} sym Unique name for the error
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* @param {*} val Value of the error
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*/
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function register(sym, val) {
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messages.set(sym, typeof val === 'function' ? val : String(val));
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}
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module.exports = {
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register,
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Error: makeDiscordjsError(Error),
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TypeError: makeDiscordjsError(TypeError),
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RangeError: makeDiscordjsError(RangeError),
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};
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