Actually it does work:

http://localhost:8080/demo/repl.html#import%20%7BparseExpression%7D%20from%20'..%2Fsrc%2Fcodegeneration%2FPlaceholderParser'%3B%0Aimport%20%7Bwrite%7D%20from%20'..%2Fsrc%2Foutputgeneration%2FTreeWriter'%3B%0Aconsole.log(write(parseExpression%20%60a.b.%24%7B'ccc'%7D%60))%3B%0A