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@fern-api/replay

v0.7.0

Published

5 days ago

Automatically preserves SDK customizations across Fern regenerations

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@fern-api/replay

Automatically preserves SDK customizations across Fern regenerations.

What it does

Fern Replay detects user edits to generated SDK code, stores them as patches, and re-applies them after each regeneration using 3-way merge. This means your customizations survive fern generate without manual intervention.

Pipeline

Detect — Find commits since last generation
Store — Save patches to replay.lock
Generate — Run generator (overwrites all)
Replay — Apply patches via 3-way merge
Commit — Commit the merged result (or surface conflicts)

Install

npm install @fern-api/replay

Development

npm install
npm run build
npm test

Local Development with Fern CLI

To use a local version of @fern-api/replay with the Fern CLI monorepo:

# From the fern-replay directory
cd /path/to/fern-replay
pnpm link --global

# From the fern monorepo root
cd /path/to/fern
pnpm link --global @fern-api/replay

Verify the link is working:

ls -la node_modules/@fern-api/replay
# Should show a symlink pointing to your local fern-replay directory

Any changes you make in fern-replay will be picked up immediately without reinstalling.

To unlink and restore the published npm version:

pnpm unlink @fern-api/replay
pnpm install

License

MIT