Reduce extension size by using Google Closure Compiler

It's not much, but it's not nothing either.
Also dropped README.md from zip-file

.gitignore

@@ -1 +1,5 @@
-*.zip
+*.zip
+
+*.min.js
+
+closure-compiler.jar

README.md

@@ -30,4 +30,7 @@ Furthermore, not every site has it's own translation for the warning message.
 - amazon.sa
 - amazon.eg
 - amazon.sg
-- amazon.com.tr
+- amazon.com.tr
+
+## External Dependencies
+The extension is minified using the [Google Closure Compiler](https://github.com/google/closure-compiler).

amznshipwarn.js

@@ -47,7 +47,8 @@ function getWarning() {
 			return "Ce produit n'est pas expédié par Amazon";
 		case "it":
 			return "Questo prodotto non è spedito da Amazon";
-		case "es", "com.mx":
+		case "es":
+		case "com.mx":
 			return "Este producto no es enviado por Amazon";
 		// TODO: Add more countries based on the Amazon TLD
 		default:

fetchClosureCompiler.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+# Remove the old version of the closure compiler
+rm -f ./closure-compiler.jar
+
+# Fetch the latest version of the closure compiler
+latest_version=$(curl -s https://repo1.maven.org/maven2/com/google/javascript/closure-compiler/ | grep -oP '(?<=href=")[^"]*(?=/)' | sort -V | tail -n 1)
+# Download and rename the closure compiler
+wget https://repo1.maven.org/maven2/com/google/javascript/closure-compiler/$latest_version/closure-compiler-$latest_version.jar -O ./closure-compiler.jar
+
+# Verify the checksum of closure compiler with the checksum file
+expected_sha512=$(curl -s https://repo1.maven.org/maven2/com/google/javascript/closure-compiler/$latest_version/closure-compiler-$latest_version.jar.sha512)
+computed_sha512=$(sha512sum ./closure-compiler.jar | cut -d ' ' -f 1)
+
+if [ "$computed_sha512" != "$expected_sha512" ]; then
+	echo "Checksum verification failed!"
+	exit 1
+else
+	echo "Checksum verification passed!"
+fi

manifest.json

@@ -1,7 +1,7 @@
 {
 	"manifest_version": 2,
 	"name": "AmznShipWarn",
-	"version": "1.0.1",
+	"version": "1.0.2",
 	"description": "Adds a warning to the Amazon page if the item is not shipped by Amazon.",
 	"homepage_url": "https://github.com/MrMinemeet/AmznShipWarn",
 
@@ -28,7 +28,7 @@
 				"https://*.amazon.com.tr/*"
 			],
 			"js": [
-				"amznshipwarn.js"
+				"amznshipwarn.min.js"
 			]
 		}
 	]

pack.sh

@@ -1,4 +1,6 @@
 #!/bin/sh
-# This script packs up necessary files into a .zip for publishing
 
-zip AmznShipWarn.zip amznshipwarn.js LICENSE README.md manifest.json
+# This script minifies and then packs up necessary files into a .zip for publishing
+java -jar ./closure-compiler.jar -O ADVANCED --js amznshipwarn.js --js_output_file amznshipwarn.min.js --language_out=ECMASCRIPT_2019
+
+zip AmznShipWarn.zip amznshipwarn.min.js LICENSE manifest.json