beforeChange is not fired?

[tbwork]

My codes:

<CodeMirror
          value={script.code}
          options={{
            mode: 'javascript',
            theme: 'solarized light',
            lineNumbers: true,
            extraKeys: {
              Alt: 'autocomplete',
            },
            hintOptions: {
              word: script.dictionary,
              hint: this.handleShowHint,
              completeSingle: false,
            },
            highlightSelectionMatches: { showToken: /\w/, annotateScrollbar: true },
          }}
          onChange={this.handleCodeChange}
          onUpdate={this.handleDomChange}
          onBeforeChange = {this.handleBeforeChange}
          onBeforeSelectionChange = {this.handleBeforeChange}
        />