Keypad Textonym Challenge

findTextonym(keys: string[]) {
    if (this.inputCount == 0) {
      this.inputDrafts = [...keys];
    } else {
      let extend = [];
      for (let d = 0; d < this.inputDrafts.length; d++) {
        for (let key of keys) {
          const appended = `${this.inputDrafts[d]}${key}`;
          extend.push(appended);
        }
      }
      this.inputDrafts = [...this.inputDrafts, ...extend];
    }

    const inputDraftFiltered = this.inputDrafts.filter((word) => {
      return word.length >= this.inputCount;
    });

    console.log('INPUT: ', this.inputDrafts.length);
    console.log('INPUT FILTERED: ', inputDraftFiltered.length);
    const matches = this.words.filter((word) => {
      return (
        inputDraftFiltered.includes(String(word).toUpperCase()) &&
        word.length == this.inputCount + 1
      );
    });
    if (Object.keys(this.dictByChar).length > 0) {
      const firstKey: KeypadItem | undefined = this.keypadItems.find((item) => {
        return item.keys.includes(this.inputDrafts[0]);
      });
      let filteredByLetters: string[] = [];
      firstKey?.keys.map((key) => {
        filteredByLetters = [
          ...filteredByLetters,
          ...this.dictByChar[String(key).toLowerCase()],
        ];
      });
      const matchByLetters: string[] = filteredByLetters.filter((word) => {
        return (
          inputDraftFiltered.includes(String(word).toUpperCase()) &&
          word.length == this.inputCount + 1
        );
      });
      this.matches = [...matches, ...matchByLetters];
    } else {
      this.matches = [...matches];
    }
  }