https://www.graalvm.org/ 
class com.oracle.truffle.js.runtime.JSContextOptions$3 implements java.util.function.Function<java.lang.String, java.util.Map<java.lang.String, java.lang.String>>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.js.runtime.JSContextOptions$3
  super_class: java.lang.Object
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.JSContextOptions$3 this
         0: .line 289
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.js.runtime.JSContextOptions$3 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/runtime/JSContextOptions$3;

  public java.util.Map<java.lang.String, java.lang.String> apply(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/util/Map;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=11, args_size=2
        start local 0 // com.oracle.truffle.js.runtime.JSContextOptions$3 this
        start local 1 // java.lang.String value
         0: .line 292
            new java.util.HashMap
            dup
            invokespecial java.util.HashMap.<init>:()V
            astore 2 /* map */
        start local 2 // java.util.Map map
         1: .line 293
            ldc ""
            aload 1 /* value */
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifeq 3
         2: .line 294
            aload 2 /* map */
            areturn
         3: .line 296
      StackMap locals: java.util.Map
      StackMap stack:
            aload 1 /* value */
            ldc ","
            invokevirtual java.lang.String.split:(Ljava/lang/String;)[Ljava/lang/String;
            astore 3 /* options */
        start local 3 // java.lang.String[] options
         4: .line 297
            aload 3 /* options */
            dup
            astore 7
            arraylength
            istore 6
            iconst_0
            istore 5
            goto 13
      StackMap locals: com.oracle.truffle.js.runtime.JSContextOptions$3 java.lang.String java.util.Map java.lang.String[] top int int java.lang.String[]
      StackMap stack:
         5: aload 7
            iload 5
            aaload
            astore 4 /* s */
        start local 4 // java.lang.String s
         6: .line 298
            aload 4 /* s */
            ldc ":"
            invokevirtual java.lang.String.split:(Ljava/lang/String;)[Ljava/lang/String;
            astore 8 /* builtin */
        start local 8 // java.lang.String[] builtin
         7: .line 299
            aload 8 /* builtin */
            arraylength
            iconst_2
            if_icmpeq 9
         8: .line 300
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Unexpected builtin arguments: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 4 /* s */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         9: .line 302
      StackMap locals: com.oracle.truffle.js.runtime.JSContextOptions$3 java.lang.String java.util.Map java.lang.String[] java.lang.String int int java.lang.String[] java.lang.String[]
      StackMap stack:
            aload 8 /* builtin */
            iconst_0
            aaload
            astore 9 /* key */
        start local 9 // java.lang.String key
        10: .line 303
            aload 8 /* builtin */
            iconst_1
            aaload
            astore 10 /* val */
        start local 10 // java.lang.String val
        11: .line 304
            aload 2 /* map */
            aload 9 /* key */
            aload 10 /* val */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
        end local 10 // java.lang.String val
        end local 9 // java.lang.String key
        end local 8 // java.lang.String[] builtin
        end local 4 // java.lang.String s
        12: .line 297
            iinc 5 1
      StackMap locals: com.oracle.truffle.js.runtime.JSContextOptions$3 java.lang.String java.util.Map java.lang.String[] top int int java.lang.String[]
      StackMap stack:
        13: iload 5
            iload 6
            if_icmplt 5
        14: .line 306
            aload 2 /* map */
            areturn
        end local 3 // java.lang.String[] options
        end local 2 // java.util.Map map
        end local 1 // java.lang.String value
        end local 0 // com.oracle.truffle.js.runtime.JSContextOptions$3 this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   15     0     this  Lcom/oracle/truffle/js/runtime/JSContextOptions$3;
            0   15     1    value  Ljava/lang/String;
            1   15     2      map  Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;
            4   15     3  options  [Ljava/lang/String;
            6   12     4        s  Ljava/lang/String;
            7   12     8  builtin  [Ljava/lang/String;
           10   12     9      key  Ljava/lang/String;
           11   12    10      val  Ljava/lang/String;
    Signature: (Ljava/lang/String;)Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;
    MethodParameters:
       Name  Flags
      value  

  public java.lang.Object apply(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.String
            invokevirtual com.oracle.truffle.js.runtime.JSContextOptions$3.apply:(Ljava/lang/String;)Ljava/util/Map;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Ljava/util/function/Function<Ljava/lang/String;Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;>;
SourceFile: "JSContextOptions.java"
EnclosingMethod: com.oracle.truffle.js.runtime.JSContextOptions
NestHost: com.oracle.truffle.js.runtime.JSContextOptions
InnerClasses:
  com.oracle.truffle.js.runtime.JSContextOptions$3