redux-saga - takeLast

index.js

export default function* root() {
    yield [
        fork(fetchByParams)
    ]

search.js

export function* handleSearch(param) {
    yield call(delay, 500);
    const companiesData = yield call(CompanyService.fetchByParams, param);
    yield put(receiveCompaniesData(companiesData.companies));
}

export function* fetchByParams() {
    let task;
    while (true) {
        const {param} = yield take(FETCH_COMPANIES_BY_PARAMS);
        if (task) {
            yield cancel(task);
        }
        task = yield fork(handleSearch, param);
    }
}