Prototype API (#2)

* Add oauth2 client

* Update LICENSE.txt

* Add oauth2 types

* Prepare for publish

scripts/esbuild.js

@@ -0,0 +1,30 @@
+// Copyright (c) Tribufu. All Rights Reserved.
+
+import { build } from "esbuild";
+import { nodeExternalsPlugin } from "esbuild-node-externals";
+
+const baseConfig = {
+    entryPoints: ["src/index.ts"],
+    platform: "neutral",
+    target: "node18",
+    bundle: true,
+    minify: true,
+    sourcemap: false,
+    legalComments: "linked",
+    plugins: [nodeExternalsPlugin()],
+};
+
+const moduleConfig = {
+    ...baseConfig,
+    outfile: "build/index.mjs",
+    format: "esm",
+};
+
+const legacyConfig = {
+    ...baseConfig,
+    outfile: "build/index.cjs",
+    format: "cjs",
+};
+
+build(moduleConfig).catch(() => process.exit(1));
+build(legacyConfig).catch(() => process.exit(1));