Explicit Drop vs Implicit drop.

01-take-latest.ts

export const takeLatest = (patternOrChannel, saga, ...args) => fork(function*() {
  let lastTask
  while (true) {
    const action = yield* take(patternOrChannel)
    if (lastTask) {
      yield cancel(lastTask) // cancel is no-op if the task has already terminated
    }
    lastTask = yield* fork(saga, ...args.concat(action))
  }
})

02-take-leading.ts

// this is the only helper that needs to change. Because `take` will see every match, even while handling logic is running
// we need to explicitly drop.
export const takeLeading = (patternOrChannel, saga, ...args) => fork(function*() {
  // if we are actively handling an action, don't fork anything new.
  let active = false;
  
  while (true) {
    const action = yield take(patternOrChannel);
    if (!active) {
      yield* fork(function*() {
        try {
          active = true;
          yield* call(saga, ...args.concat(action));
        } finally {
          active = false;
        }
      });
    }
  }
});
  

03-take-every.ts

export const takeEvery = (patternOrChannel, saga, ...args) => fork(function*() {
  while (true) {
    const action = yield* take(patternOrChannel)
    yield* fork(saga, ...args.concat(action))
  }
})