feat: initial boilerplate

api/libraries/config/libraries/args.ts

@@ -0,0 +1,21 @@
+import { parseArgs } from "@std/cli";
+
+import { Parser, toString } from "./parsers.ts";
+
+export function getArgsVariable(key: string, fallback?: string): string;
+export function getArgsVariable<T extends Parser>(key: string, parse: T, fallback?: string): ReturnType<T>;
+export function getArgsVariable<T extends Parser>(key: string, parse?: T, fallback?: string): ReturnType<T> {
+  if (typeof parse === "string") {
+    fallback = parse;
+    parse = undefined;
+  }
+  const flags = parseArgs(Deno.args);
+  const value = flags[key];
+  if (value === undefined) {
+    if (fallback !== undefined) {
+      return parse ? parse(fallback) : fallback;
+    }
+    throw new Error(`Config Exception: Missing ${key} variable in arguments`);
+  }
+  return parse ? parse(value) : toString(value);
+}