# `History.depth`

> Contract 2.0.0 · package sha256 `a857eca95b35921109faf997094bb4192f12527d9d0fcd4be7e97f06425bad6e` · generated from `configurator-runtime.d.ts` by `services/onsite-scripter/scripts/build-contract-docs.mjs`; edit the source, not this file.

Property of [`History`](History.md) · stable · since 2.0.0 · called as `session.history.depth`

```ts
readonly depth: number;
```

The number of undo steps above the floor.

## Generic-API test (spec 3.1)

| Rule | Result |
| --- | --- |
| 1. Neutral name | pass: `depth` names no product |
| 2. A precedent | pass: a correctness rule (rows `G33`) |
| 3. Two apps, or labs | pass: 26 apps (ledger: app-4fd23bc869, app-822bb9d6aa, app-8675b3225c, app-c1384707fc, app-e3b47169bc, app-e61a0b42ad, app-e9a33606d2, app-f07e9033d9 and 1 more; fleet cross-check: app-04c2774145, app-37356bf09f, app-4762caacdc, app-4f16d2f6da, app-510d750508, app-59c5b5751e, app-b362a81c85, app-b4ae2fce25 and 14 more) |
| 4. The cheaper fix first | decided per need in Appendix B: rows `G33` at tier stable (a member only where no rule, data, asset or app code serves the need) |