shivaam commented on issue #69288:
URL: https://github.com/apache/airflow/issues/69288#issuecomment-5081501458
For dependency helpers, I think we can preserve the useful behavior of
Python's `chain()`.
A linear chain:
```ts
chain(first, second, third, fourth);
```
would create:
```text
first -> second -> third -> fourth
```
We could also support Python's pairwise behavior for equally sized arrays:
```ts
chain(
first,
[second, third],
[fourth, fifth],
last,
);
```
This would create:
```text
first -> second -> fourth -> last
first -> third -> fifth -> last
```
The initial API would not need a separate cross-product helper because the
same graph can be expressed with `before()`:
```ts
first.before(third, fourth);
second.before(third, fourth);
```
If this becomes repetitive in real Dags, `crossDownstream()` could be added
later as a convenience:
```ts
crossDownstream(
[first, second],
[third, fourth],
);
```
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