[skip ci]refactor(lib): General refactoration (#1579)

lib/synchrony/src/main/java/eu/kanade/tachiyomi/lib/synchrony/Deobfuscator.kt

@@ -7,25 +7,25 @@ import app.cash.quickjs.QuickJs
  */
 object Deobfuscator {
     fun deobfuscateScript(source: String): String? {
-        val engine = QuickJs.create()
         val originalScript = javaClass.getResource("/assets/$SCRIPT_NAME")
             ?.readText() ?: return null
 
         // Sadly needed until QuickJS properly supports module imports:
         // Regex for finding one and two in "export{one as Deobfuscator,two as Transformer};"
         val regex = """export\{(.*) as Deobfuscator,(.*) as Transformer\};""".toRegex()
-        val synchronyScript = regex.find(originalScript)!!.let { match ->
+        val synchronyScript = regex.find(originalScript)?.let { match ->
             val (deob, trans) = match.destructured
             val replacement = "const Deobfuscator = $deob, Transformer = $trans;"
             originalScript.replace(match.value, replacement)
-        }
-        engine.evaluate("globalThis.console = { log: () => {}, warn: () => {}, error: () => {}, trace: () => {} };")
-        engine.evaluate(synchronyScript)
+        } ?: return null
 
-        engine.set("source", TestInterface::class.java, object: TestInterface { override fun getValue() = source })
-        val result = engine.evaluate("new Deobfuscator().deobfuscateSource(source.getValue())") as? String
-        engine.close()
-        return result
+        return QuickJs.create().use { engine ->
+            engine.evaluate("globalThis.console = { log: () => {}, warn: () => {}, error: () => {}, trace: () => {} };")
+            engine.evaluate(synchronyScript)
+
+            engine.set("source", TestInterface::class.java, object : TestInterface { override fun getValue() = source })
+            engine.evaluate("new Deobfuscator().deobfuscateSource(source.getValue())") as? String
+        }
     }
 
     @Suppress("unused")