## Problem
`yarn twenty dev` crashes after running for a while with:
```
FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory
```
The crash happens during the **Manifest Build** phase, after the process
has been up for a long time (~35 min in the reported case) — the
signature of a slow memory leak in the long-running watch process, not a
single oversized operation.
Fixes the issue described in `core-team-issues#2560`.
## Root cause
`manifest-extract-config-from-file.ts``loadModule()` compiles each
entity file with esbuild (`bundle: true`, so the whole dependency graph
is inlined), writes it to a unique `mkdtemp` directory, and loads it
with `appRequire(tempFile)`.
`createRequire` shares Node's global module cache (`Module._cache`), so
**every loaded temp module is retained in the require cache forever**.
Two things made this unbounded:
1. `mkdtemp` generates a fresh random directory each call, so cache keys
never collide — entries purely accumulate.
2. The `finally` block removed the temp dir **from disk** but never
evicted the `require.cache` entry, so the evaluated, fully-bundled
module object stayed pinned in the JS heap.
In dev mode the orchestrator re-runs `buildManifest` on **every** file
change and watcher rebuild (`scheduleSync()`), and each rebuild compiles
& `require()`s ~one module per entity file (53 in the reported case).
Over a session of editing, thousands of large bundled module objects
pile up in `require.cache` until V8's heap is exhausted → FATAL OOM.
## Fix
Delete the temp module from the require cache after loading it, so
memory stays bounded to a single rebuild. Because `bundle: true` inlines
the whole graph, the temp module is the only cache entry per load, so
deleting it lets the bundled object be GC'd.
```ts
} finally {
delete appRequire.cache[tempFile];
await remove(tempDir);
}
```
## Test
Adds a regression test (`manifest-extract-config-from-file.spec.ts`)
that runs `extractManifestFromFile` repeatedly and asserts no
`twenty-manifest` temp modules accumulate in the require cache.
https://claude.ai/code/session_0168hN9yEYvjZbqdz7PckKn8
---
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Code](https://claude.ai/code/session_0168hN9yEYvjZbqdz7PckKn8)_
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martmull
6a36fc3ba8
