peekImplicitSemiColon_() {
    switch (peekType()) {
      case SEMI_COLON:
      case CLOSE_CURLY:
      case END_OF_FILE:
        return true;
    }
    let token = peekTokenNoLineTerminator();
    return token === null;
  }
Returns true if an implicit or explicit semi colon is at the current location.

@return {boolean}
@private