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stack/docs/scratchpads/installer-next-fast-npm-20260625.md
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feat(installer): prefer npm next lane
2026-06-25 01:34:24 -05:00

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# Installer `--next` fast npm lane — 2026-06-25
## Scope
Flip `tools/install.sh --next` from source-build-first to fast npm `@next` first, with source fallback.
## Registry reality check
Gitea npm registry: `https://git.mosaicstack.dev/api/packages/mosaicstack/npm/`
Verified before implementation:
- `@mosaicstack/mosaic@next` resolves to `0.0.49-next.1633`.
- `@mosaicstack/gateway@next` resolves to `0.0.7-next.1633`.
- `@mosaicstack/gateway` dist-tags include `latest: 0.0.6` and `next: 0.0.7-next.1633`.
- `apps/gateway/package.json` is non-private and has Gitea npm `publishConfig`.
Conclusion: the installer can fast-install both CLI and gateway npm packages for `--next`. The gateway Docker `gateway:sha-<short>` remains the deployment/harness artifact; the npm gateway package is valid for the installer global package path.
## Behavior
- `--next` with no explicit ref:
1. framework archive from `next`;
2. resolve `@mosaicstack/gateway@next` and `@mosaicstack/mosaic@next`;
3. require both resolved versions to share the same `next.<pipeline>` suffix;
4. install the exact resolved package versions;
5. set `MOSAIC_GATEWAY_SKIP_NPM_INSTALL=1` so wizard does not overwrite the prerelease gateway;
6. if either package is missing/unreachable/mismatched/fails, fall back to existing source build at `next`.
- `--dev` remains pure source build.
- explicit `--ref` / `MOSAIC_REF` still wins over `--next` and uses the source path for that exact ref.
## Install detail
The installer writes the scoped npmrc mapping (`@mosaicstack:registry=...`) and then runs npm install without overriding npm's default registry. Passing `--registry=<gitea>` to `npm install` forces public transitive dependencies (for example `@anthropic-ai/sdk`) to resolve from Gitea and breaks the fast path; the scoped npmrc mapping is the correct split-registry behavior.
## Verification notes
- Added `tools/install-next-lane.test.sh` with a fake npm/source harness for exact-version fast install, registry failure source fallback, explicit-ref precedence, and mismatched suffix warning.
- Wired the installer harness into `pnpm test` via `pnpm run test:installer`.
- Real temp-prefix fast install succeeded with `@mosaicstack/gateway@0.0.7-next.1633` and `@mosaicstack/mosaic@0.0.49-next.1633`.