Initial commit

packages/config-loader/src/index.ts

@@ -0,0 +1,32 @@
+import { readFileSync, existsSync } from "fs";
+import { isObject, isString, isEmpty } from "lodash";
+
+export type BotConfig = {
+  token: string;
+  channelId: string;
+  adminChatId: string;
+};
+
+export type BotConfigRaw = Partial<BotConfig>;
+
+const DEFAULT_CONFIG_PATH = "config.json";
+const isValidString = (x: unknown) => isString(x) && !isEmpty(x);
+
+const ensureIsObject = (x?: any): x is BotConfigRaw => isObject(x);
+const ValidateConfig = (config?: any): config is BotConfig => {
+  if (!ensureIsObject(config)) return false;
+
+  const { token, channelId, adminChatId } = config;
+  return isValidString(token) && isValidString(channelId) && isValidString(adminChatId);
+};
+
+export const loadBotConfig = (configPath = DEFAULT_CONFIG_PATH): BotConfig => {
+  if (!existsSync(configPath)) throw new Error(`Missing ${configPath} file`);
+
+  const configFileString = readFileSync(configPath).toString();
+
+  const parsedConfig: any = JSON.parse(configFileString);
+  if (ValidateConfig(parsedConfig)) return parsedConfig;
+
+  throw new Error("Config is invalid");
+};