The Parser.parseScript function parses a String of ECMAScript program text using Script as the goal symbol, and either returns a Script node or throws a ParseError. Similarly, the Parser.parseModule function parses a String of ECMAScript program text using Module as the goal symbol, and either returns a Module node or throws a ParseError.

import com.shapesecurity.shift.parser.Parser;

String js = "a; b;";
Script p = Parser.parseScript(js);
Module m = Parser.parseModule(js);