How to use the transit-js.makeWriteHandler function in transit-js

TokenType.DEFAULT, TokenType.DO, TokenType.ELSE, TokenType.EXPORT,
               TokenType.EXTENDS, TokenType.FINALLY, TokenType.FOR, TokenType.FUNCTION,
               TokenType.IF, TokenType.IMPORT, TokenType.LET, TokenType.NEW,
               TokenType.RETURN, TokenType.SUPER, TokenType.SWITCH, TokenType.THIS,
               TokenType.THROW, TokenType.TRY, TokenType.VAR, TokenType.WHILE,
               TokenType.WITH, TokenType.NULL, TokenType.TRUE, TokenType.FALSE,
               TokenType.YIELD, TokenType.NUMBER, TokenType.STRING, TokenType.REGEXP,
               TokenType.IDENTIFIER, TokenType.CONST, TokenType.TEMPLATE,
               TokenType.ILLEGAL];

let ListHandler = transit.makeWriteHandler({
  tag: () => "array",
  rep: (v) => v
});

let MapHandler = transit.makeWriteHandler({
  tag: function() { return "map"; },
  rep: function(v) { return v; },
  stringRep: function() { return null; }
});

let SyntaxHandler = transit.makeWriteHandler({
  tag: () => "stx",
  rep: (v) => {
    if (List.isList(v.token)) {
      return [v.token, v.scopesets];
    } else {
      let t = transit.objectToMap(v.token);
      t.set("type", typeMap.indexOf(v.token.type));
      return [t, v.scopesets];
    }
  }

TokenType.YIELD, TokenType.NUMBER, TokenType.STRING, TokenType.REGEXP,
               TokenType.IDENTIFIER, TokenType.CONST, TokenType.TEMPLATE,
               TokenType.ILLEGAL];

let ListHandler = transit.makeWriteHandler({
  tag: () => "array",
  rep: (v) => v
});

let MapHandler = transit.makeWriteHandler({
  tag: function() { return "map"; },
  rep: function(v) { return v; },
  stringRep: function() { return null; }
});

let SyntaxHandler = transit.makeWriteHandler({
  tag: () => "stx",
  rep: (v) => {
    if (List.isList(v.token)) {
      return [v.token, v.scopesets];
    } else {
      let t = transit.objectToMap(v.token);
      t.set("type", typeMap.indexOf(v.token.type));
      return [t, v.scopesets];
    }
  }
});
let SymbolHandler = transit.makeWriteHandler({
  tag: () => "symb",
  rep: (v) =>  [v.name]
});

stringRep: function() { return null; }
});

let SyntaxHandler = transit.makeWriteHandler({
  tag: () => "stx",
  rep: (v) => {
    if (List.isList(v.token)) {
      return [v.token, v.scopesets];
    } else {
      let t = transit.objectToMap(v.token);
      t.set("type", typeMap.indexOf(v.token.type));
      return [t, v.scopesets];
    }
  }
});
let SymbolHandler = transit.makeWriteHandler({
  tag: () => "symb",
  rep: (v) =>  [v.name]
});

let writer = transit.writer("json", {
  handlers: transit.map([
    List, ListHandler,
    Map, MapHandler,
    Syntax, SyntaxHandler,
    SymbolClass, SymbolHandler
  ])
});

function makeReader(bindings) {
  return transit.reader("json", {
    arrayBuilder: {

TokenType.EQ_STRICT, TokenType.NE_STRICT, TokenType.LT, TokenType.GT,
               TokenType.LTE, TokenType.GTE, TokenType.INSTANCEOF, TokenType.IN,
               TokenType.NOT, TokenType.BIT_NOT, TokenType.AWAIT, TokenType.DELETE,
               TokenType.TYPEOF, TokenType.VOID, TokenType.BREAK, TokenType.CASE,
               TokenType.CATCH, TokenType.CLASS, TokenType.CONTINUE, TokenType.DEBUGGER,
               TokenType.DEFAULT, TokenType.DO, TokenType.ELSE, TokenType.EXPORT,
               TokenType.EXTENDS, TokenType.FINALLY, TokenType.FOR, TokenType.FUNCTION,
               TokenType.IF, TokenType.IMPORT, TokenType.LET, TokenType.NEW,
               TokenType.RETURN, TokenType.SUPER, TokenType.SWITCH, TokenType.THIS,
               TokenType.THROW, TokenType.TRY, TokenType.VAR, TokenType.WHILE,
               TokenType.WITH, TokenType.NULL, TokenType.TRUE, TokenType.FALSE,
               TokenType.YIELD, TokenType.NUMBER, TokenType.STRING, TokenType.REGEXP,
               TokenType.IDENTIFIER, TokenType.CONST, TokenType.TEMPLATE,
               TokenType.ILLEGAL];

let ListHandler = transit.makeWriteHandler({
  tag: () => "array",
  rep: (v) => v
});

let MapHandler = transit.makeWriteHandler({
  tag: function() { return "map"; },
  rep: function(v) { return v; },
  stringRep: function() { return null; }
});

let SyntaxHandler = transit.makeWriteHandler({
  tag: () => "stx",
  rep: (v) => {
    if (List.isList(v.token)) {
      return [v.token, v.scopesets];
    } else {