Method diff

src/diff/base.ts:54–75

(
    oldStr: InputValueT,
    newStr: InputValueT,
    // Type below is not accurate/complete - see above for full possibilities - but it compiles
    options: DiffCallbackNonabortable<ValueT> | AllDiffOptions & Partial<CallbackOptionNonabortable<ValueT>> = {}
  )

    options?: AllDiffOptions
  ): ChangeObject<ValueT>[]
  diff(
    oldStr: InputValueT,
    newStr: InputValueT,
    // Type below is not accurate/complete - see above for full possibilities - but it compiles
    options: DiffCallbackNonabortable<ValueT> | AllDiffOptions & Partial<CallbackOptionNonabortable<ValueT>> = {}
  ): ChangeObject<ValueT>[] | undefined {
    let callback: DiffCallbackAbortable<ValueT> | DiffCallbackNonabortable<ValueT> | undefined;
    if (typeof options === 'function') {
      callback = options;
      options = {};
    } else if ('callback' in options) {
      callback = options.callback;
    }
    // Allow subclasses to massage the input prior to running
    const oldString = this.castInput(oldStr, options);
    const newString = this.castInput(newStr, options);

    const oldTokens = this.removeEmpty(this.tokenize(oldString, options));
    const newTokens = this.removeEmpty(this.tokenize(newString, options));

    return this.diffWithOptionsObj(oldTokens, newTokens, options, callback);
  }

  private diffWithOptionsObj(
    oldTokens: TokenT[],