Lee-W opened a new issue, #67692:
URL: https://github.com/apache/airflow/issues/67692
### Body
The UI endpoints that return `asset_expression` declare it as `dict | None`
on the Python datamodel — `datamodels/dags.py`, `datamodels/ui/dags.py`,
`datamodels/ui/assets.py`, `datamodels/ui/partitioned_dag_runs.py`. OpenAPI gen
turns this into `{ [k: string]: unknown } | null` in the generated TypeScript,
so the UI hand-writes an ExpressionType discriminated union in
`src/components/AssetExpression/` and the consumers (`AssetProgressCell.tsx`,
`pages/DagsList/AssetSchedule.tsx`) cast unknown as `ExpressionType` with no
runtime check.
If the server-side shape ever changes the TypeScript build won't catch it —
the failure mode is a blank render or a discriminator-missing crash at runtime.
from https://github.com/apache/airflow/pull/64571#discussion_r3317834462
### Committer
- [x] I acknowledge that I am a maintainer/committer of the Apache Airflow
project.
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