* perf: replace lookahead by lookaheadCharCode * fix: flow ignore * refactor: add nextTokenStart method * refactor: duplicated isNewLine code * refactor: remove lookahead usage from babylon core
* perf: replace lookahead by lookaheadCharCode * fix: flow ignore * refactor: add nextTokenStart method * refactor: duplicated isNewLine code * refactor: remove lookahead usage from babylon core