function parseESC(parseState) {
    const ch = parseState.consumeChar();

    if (ch == '\x1b') {
      return;
    }

    this.dispatch('ESC', ch, parseState);

    if (parseState.func == parseESC) {
      parseState.resetParseFunction();
    }
  }
Escape (ESC).

@this {!hterm.VT}
@param {!hterm.VT.ParseState} parseState The current parse state.