How to use the parchment.Text function in parchment

this.quill.root.addEventListener('keydown', (evt) => {
      if (evt.defaultPrevented) return;
      let which = evt.which || evt.keyCode;
      let bindings = (this.bindings[which] || []).filter(function(binding) {
        return Keyboard.match(evt, binding);
      });
      if (bindings.length === 0) return;
      let range = this.quill.getSelection();
      if (range == null || !this.quill.hasFocus()) return;
      let [line, offset] = this.quill.scroll.line(range.index);
      let [leafStart, offsetStart] = this.quill.scroll.leaf(range.index);
      let [leafEnd, offsetEnd] = range.length === 0 ? [leafStart, offsetStart] : this.quill.scroll.leaf(range.index + range.length);
      let prefixText = leafStart instanceof Parchment.Text ? leafStart.value().slice(0, offsetStart) : '';
      let suffixText = leafEnd instanceof Parchment.Text ? leafEnd.value().slice(offsetEnd) : '';
      let curContext = {
        collapsed: range.length === 0,
        empty: range.length === 0 && line.length() <= 1,
        format: this.quill.getFormat(range),
        offset: offset,
        prefix: prefixText,
        suffix: suffixText
      };
      let prevented = bindings.some((binding) => {
        if (binding.collapsed != null && binding.collapsed !== curContext.collapsed) return false;
        if (binding.empty != null && binding.empty !== curContext.empty) return false;
        if (binding.offset != null && binding.offset !== curContext.offset) return false;
        if (Array.isArray(binding.format)) {
          // any format is present
          if (binding.format.every(function(name) {

this.quill.root.addEventListener('keydown', (evt) => {
      if (evt.defaultPrevented) return;
      let which = evt.which || evt.keyCode;
      let bindings = (this.bindings[which] || []).filter(function(binding) {
        return Keyboard.match(evt, binding);
      });
      if (bindings.length === 0) return;
      let range = this.quill.getSelection();
      if (range == null || !this.quill.hasFocus()) return;
      let [line, offset] = this.quill.getLine(range.index);
      let [leafStart, offsetStart] = this.quill.getLeaf(range.index);
      let [leafEnd, offsetEnd] = range.length === 0 ? [leafStart, offsetStart] : this.quill.getLeaf(range.index + range.length);
      let prefixText = leafStart instanceof Parchment.Text ? leafStart.value().slice(0, offsetStart) : '';
      let suffixText = leafEnd instanceof Parchment.Text ? leafEnd.value().slice(offsetEnd) : '';
      let curContext = {
        collapsed: range.length === 0,
        empty: range.length === 0 && line.length() <= 1,
        format: this.quill.getFormat(range),
        offset: offset,
        prefix: prefixText,
        suffix: suffixText
      };
      let prevented = bindings.some((binding) => {
        if (binding.collapsed != null && binding.collapsed !== curContext.collapsed) return false;
        if (binding.empty != null && binding.empty !== curContext.empty) return false;
        if (binding.offset != null && binding.offset !== curContext.offset) return false;
        if (Array.isArray(binding.format)) {
          // any format is present
          if (binding.format.every(function(name) {

this.quill.root.addEventListener('keydown', (evt) => {
      if (evt.defaultPrevented) return;
      let which = evt.which || evt.keyCode;
      let bindings = (this.bindings[which] || []).filter(function(binding) {
        return Keyboard.match(evt, binding);
      });
      if (bindings.length === 0) return;
      let range = this.quill.getSelection();
      if (range == null || !this.quill.hasFocus()) return;
      let [line, offset] = this.quill.getLine(range.index);
      let [leafStart, offsetStart] = this.quill.getLeaf(range.index);
      let [leafEnd, offsetEnd] = range.length === 0 ? [leafStart, offsetStart] : this.quill.getLeaf(range.index + range.length);
      let prefixText = leafStart instanceof Parchment.Text ? leafStart.value().slice(0, offsetStart) : '';
      let suffixText = leafEnd instanceof Parchment.Text ? leafEnd.value().slice(offsetEnd) : '';
      let curContext = {
        collapsed: range.length === 0,
        empty: range.length === 0 && line.length() <= 1,
        format: this.quill.getFormat(range),
        offset: offset,
        prefix: prefixText,
        suffix: suffixText
      };
      let prevented = bindings.some((binding) => {
        if (binding.collapsed != null && binding.collapsed !== curContext.collapsed) return false;
        if (binding.empty != null && binding.empty !== curContext.empty) return false;
        if (binding.offset != null && binding.offset !== curContext.offset) return false;
        if (Array.isArray(binding.format)) {
          // any format is present
          if (binding.format.every(function(name) {
            return curContext.format[name] == null;

this.quill.root.addEventListener('keydown', (evt) => {
      if (evt.defaultPrevented) return;
      let which = evt.which || evt.keyCode;
      let bindings = (this.bindings[which] || []).filter(function(binding) {
        return Keyboard.match(evt, binding);
      });
      if (bindings.length === 0) return;
      let range = this.quill.getSelection();
      if (range == null || !this.quill.hasFocus()) return;
      let [line, offset] = this.quill.scroll.line(range.index);
      let [leafStart, offsetStart] = this.quill.scroll.leaf(range.index);
      let [leafEnd, offsetEnd] = range.length === 0 ? [leafStart, offsetStart] : this.quill.scroll.leaf(range.index + range.length);
      let prefixText = leafStart instanceof Parchment.Text ? leafStart.value().slice(0, offsetStart) : '';
      let suffixText = leafEnd instanceof Parchment.Text ? leafEnd.value().slice(offsetEnd) : '';
      let curContext = {
        collapsed: range.length === 0,
        empty: range.length === 0 && line.length() <= 1,
        format: this.quill.getFormat(range),
        offset: offset,
        prefix: prefixText,
        suffix: suffixText
      };
      let prevented = bindings.some((binding) => {
        if (binding.collapsed != null && binding.collapsed !== curContext.collapsed) return false;
        if (binding.empty != null && binding.empty !== curContext.empty) return false;
        if (binding.offset != null && binding.offset !== curContext.offset) return false;
        if (Array.isArray(binding.format)) {
          // any format is present
          if (binding.format.every(function(name) {
            return curContext.format[name] == null;