プロミスでラップ

saga.js

function* sendPlace(action: Action): Generator<any, any, any> {
    try {
        const response: any = yield call(Geo.sendPlace, action.payload, action.meta);
        yield put(someSendPlaceOk(response));
    } catch (error) {
        yield put(someSendPlaceNg(error));
    }
}

export function* watchGeoSendPlace(): Generator<any, any, any> {
    while (true) {
        const action = yield take(ActionTypes.SOME_SEND_PLACE_WSSTART);
        yield fork(sendPlace, action);
    }
}

services_geoなど.js

const Geo = {
    sendPlace: (payload: geoSendPlaceStartPayload, meta: any = {}): Promise<*> => {
        return new Promise((resolve, reject) => {
            navigator.geolocation.getCurrentPosition(
                (position) => {
                    const lat = position.coords.latitude;
                    const lng = position.coords.longitude;
                    const newPayload = { lat, lng };
                    resolve(newPayload, meta)
                },
                (error) => {
                    const errorInfo = JSON.stringify(error);
                    reject(new Error(errorInfo));
                },
            )
        });
    },
};

コンポーネント.js

    sendCurrentPlace(): void {
        const lat = null;
        const lng = null;
        const payload = {lat, lng};
        this.props.geoActions.geoSendPlace(payload);
    }