Remove java.io.Serializable from CompilerOptions.

This isn't used internally at Google and we don't really want to support it - we plan to do any new serialization via other formats like proto, instead of relying on the Java serializer.

PiperOrigin-RevId: 727090850

Author: lauraharker

src/com/google/javascript/jscomp/CompilerOptions.java

@@ -42,11 +42,6 @@
 import com.google.javascript.rhino.IR;
 import com.google.javascript.rhino.Node;
 import com.google.javascript.rhino.SourcePosition;
-import java.io.IOException;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
-import java.io.OutputStream;
-import java.io.Serializable;
 import java.nio.charset.Charset;
 import java.nio.file.Path;
 import java.util.ArrayList;
@@ -58,7 +53,7 @@
 import org.jspecify.annotations.Nullable;
 
 /** Compiler options */
-public class CompilerOptions implements Serializable {
+public class CompilerOptions {
   // The number of characters after which we insert a line break in the code
   static final int DEFAULT_LINE_LENGTH_THRESHOLD = 500;
 
@@ -2777,11 +2772,6 @@ public void setChunkOutputType(ChunkOutputType chunkOutputType) {
     this.chunkOutputType = chunkOutputType;
   }
 
-  /** Serializes compiler options to a stream. */
-  public void serialize(OutputStream objectOutputStream) throws IOException {
-    new ObjectOutputStream(objectOutputStream).writeObject(this);
-  }
-
   public void setStrictMessageReplacement(boolean strictMessageReplacement) {
     this.strictMessageReplacement = strictMessageReplacement;
   }
@@ -3360,19 +3350,6 @@ public char[] getPropertyReservedNamingNonFirstChars() {
     return reservedChars;
   }
 
-  private void writeObject(ObjectOutputStream out) throws IOException {
-    out.defaultWriteObject();
-    out.writeObject(outputCharset == null ? null : outputCharset.name());
-  }
-
-  private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
-    in.defaultReadObject();
-    String outputCharsetName = (String) in.readObject();
-    if (outputCharsetName != null) {
-      outputCharset = Charset.forName(outputCharsetName);
-    }
-  }
-
   boolean shouldOptimize() {
     return !skipNonTranspilationPasses
         && !checksOnly