deduceInputFromTextAreaValue = function (couldBeEmojiInput) {
                var oldState = _this._textAreaState;
                var newState = _this._textAreaState.readFromTextArea(_this._textArea);
                return [newState, textAreaState_1.TextAreaState.deduceInput(oldState, newState, couldBeEmojiInput)];
            }
Deduce the typed input from a text area's value and the last observed state.