processor/src/main/java/repacked/com/squareup/javawriter/JavaWriter.java
public JavaWriter emitPackage(String packageName) throws IOException {
    if (this.packagePrefix != null) {
      throw new IllegalStateException();
    }
    if (packageName.isEmpty()) {
      this.packagePrefix = "";
    } else {
      out.write("package ");
      out.write(packageName);
      out.write(";\n\n");
      this.packagePrefix = packageName + ".";
    }
    return this;
  }
public JavaWriter emitPackage(String packageName) throws IOException {
    if (this.packagePrefix != null) {
      throw new IllegalStateException();
    }
    if (packageName.isEmpty()) {
      this.packagePrefix = "";
    } else {
      out.write("package ");
      out.write(packageName);
      out.write(";\n\n");
      this.packagePrefix = packageName + ".";
    }
    return this;
  }
Emit a package declaration and empty line.