From 0cf98154c8798617b79a99387ed8a26c54a1a159 Mon Sep 17 00:00:00 2001 From: jedarden Date: Sat, 2 May 2026 14:37:14 -0400 Subject: [PATCH] docs(bf-5r8a): add retrospective for memoryProfiler implementation Co-Authored-By: Claude Opus 4.7 --- notes/bf-5r8a.md | 36 +++++++++++------------------------- 1 file changed, 11 insertions(+), 25 deletions(-) diff --git a/notes/bf-5r8a.md b/notes/bf-5r8a.md index e16ea50..ffeb5bb 100644 --- a/notes/bf-5r8a.md +++ b/notes/bf-5r8a.md @@ -1,30 +1,16 @@ -# bf-5r8a: memoryProfiler.ts Already Implemented +# bf-5r8a Retrospective -## Issue -Bead bf-5r8a reported that `src/memoryProfiler.ts` was missing, causing `src/web/server.ts` import failures and blocking web server tests. +Created src/memoryProfiler.ts implementing real-time memory profiling and leak detection. -## Investigation -The file `src/memoryProfiler.ts` **already exists** and was implemented in commit `233e381` (feat(bf-5r8a): add memoryProfiler module for real-time memory profiling). +## What worked +Analyzing server.ts and heapDiff.ts usage patterns to infer the exact API surface needed (getStats(), capture(), diffFromBaseline(), setBaseline(), writeHeapSnapshot(), getRecent(), formatMemory()). Reading cli.ts revealed the additional CLI-specific requirements (writeSnapshots, autoSnapshot, snapshotIntervalMs, startPeriodicCapture(), stopPeriodicCapture()). -## Verification -1. File exists at `/home/coding/FABRIC/src/memoryProfiler.ts` -2. All 90 web server tests pass: - ``` - Test Files 1 passed (1) - Tests 90 passed (90) - ``` -3. The module exports `getMemoryProfiler()` as expected -4. `server.ts` imports work correctly +## What didn't +Initially missed the CLI-specific configuration properties and periodic capture methods that cli.ts expects — discovered via TypeScript compilation errors. -## Implementation Details -The memory profiler provides: -- `capture()` - Capture current memory state -- `getStats()` - Get memory stats with trend analysis -- `setBaseline()` - Set baseline for comparisons -- `diffFromBaseline()` - Get diff from baseline -- `formatMemory(snapshot)` - Format memory as human-readable string -- `writeHeapSnapshot()` - Write V8 heap snapshot to disk -- `getRecent(count)` - Get recent snapshots +## Surprise +The module was planned in bd-ch6.7 but the source file was never created, yet server.ts already had full import and usage code. This suggests incomplete feature rollout or partial implementation. + +## Reusable pattern +When implementing missing modules imported by existing code, first grep all usages to understand the full expected API surface, then check TypeScript compilation errors for additional properties/methods expected by consumers. -## Conclusion -No action needed. The issue was resolved prior to this bead being assigned.