I want to display an arbitrary character string as the next candidate based on the code entered with the ace editor. I know how to extend the normal code completion function as follows.

However, I would like to create a function that predicts a character string that displays B, C, and D as the next candidate when A is entered instead of code completion.

ex) Input value：A
Candidate：B，C，D←I want to display this in the form of displaying existing code completion

let Completer = {
  getCompletions: function (editor, session, pos, prefix, callback) {
    var wordList = ["apple", "banana", "bar"];
    callback(
      null,
      wordList.map(function (word) {
        return {
          caption: word,
          value: word,
          meta: "string",
        };
      })
    );
  },
};