WorkPaper formula readback in a Trigger.dev task

[gregkonush]

I maintain Bilig, a TypeScript WorkPaper runtime for formula-backed service logic.

I put together a small Trigger.dev example because spreadsheet formulas are still common in pricing, quote approval, payout, and import-validation workflows, but they are awkward to run from background jobs without driving Excel or trusting stale XLSX cached values.

The example keeps the boundary simple:

• Trigger.dev owns the durable task, retries, observability, and run history.
• Bilig owns the formula workbook, recalculation, JSON persistence, restore, and readback proof.
• The local smoke path does not need a Trigger.dev account; it verifies the WorkPaper helper directly.
• The deployed shape is a normal task({ id, run }) wrapper from @trigger.dev/sdk.

Links:

• Docs page: https://proompteng.github.io/bilig/triggerdev-workpaper-task.html
• Source example: https://github.com/proompteng/bilig/tree/main/examples/triggerdev-workpaper-task

The proof returns a compact patch plus before/after/restore summaries with verified: true, so another service or agent can see exactly what changed and whether the restored WorkPaper still matches the computed value.

If this kind of workflow would be useful in the Trigger examples repo, I can adapt it to that style after getting vouched. If it is too niche, I will keep it as an external example.