Refactor: Move data-access code to Typescript w/ shared interface

ts/types/I18N.ts

@@ -0,0 +1,11 @@
+export type LocaleMessagesType = {
+  [key: string]: {
+    message: string;
+    description?: string;
+  };
+};
+
+export type LocaleType = {
+  i18n: (key: string, placeholders: Array<string>) => string;
+  messages: LocaleMessagesType;
+};

ts/types/Logging.ts

@@ -0,0 +1,10 @@
+type LogFunction = (...args: Array<any>) => void;
+
+export type LoggerType = {
+  fatal: LogFunction;
+  error: LogFunction;
+  warn: LogFunction;
+  info: LogFunction;
+  debug: LogFunction;
+  trace: LogFunction;
+};