Add compilation step

build.js

@@ -0,0 +1,27 @@
+// @ts-check
+
+import { readFileSync, writeFileSync } from 'fs';
+
+const spriteSheets = [
+	{
+		key: "__SPRITE_SHEET__",
+		path: "./sprites/birb.png"
+	},
+	{
+		key: "__FEATHER_SPRITE_SHEET__",
+		path: "./sprites/feather.png"
+	},
+	{
+		key: "__DECORATIONS_SPRITE_SHEET__",
+		path: "./sprites/decorations.png"
+	}
+];
+
+let birbJs = readFileSync('birb.js', 'utf8');
+
+for (const spriteSheet of spriteSheets) {
+	const dataUri = readFileSync(spriteSheet.path, 'base64');
+	birbJs = birbJs.replaceAll(spriteSheet.key, `data:image/png;base64,${dataUri}`);
+}
+
+writeFileSync('./dist/birb.js', birbJs);