mengxi-ream Migration Scripts
Rule: Migrations Are Frozen Snapshots
Migration scripts must NEVER import or reference:
- Constants, helpers, or utilities from the main codebase
- Shared types (use
anyfor migration input/output) - Factory functions like
createXxx()
Why: The codebase evolves. A migration written today references code that may change tomorrow. When that constant changes, the migration silently breaks — it now migrates to the new shape, not the shape that existed when the migration was written.
Rule: Migration Registries Must Validate the Chain
In this repo, config migration registries should auto-discover migration files from src/utils/config/migration-scripts/v*-to-v*.ts (for example via import.meta.glob), and the registry must:
- Parse both
fromVersionandtoVersionfrom the filename - Reject invalid steps like
v001-to-v003 - Reject duplicate target versions
- Reject discontinuous chains
Do not silently map only the target version and assume filenames are correct.
Rule: Keep Migration Imports Off Hot Paths
Do not let generic config read helpers or content-script paths import migration registries unless they really perform migration.
Prefer to isolate migration-aware reads/writes into dedicated modules for import/sync/restore flows, so normal runtime paths do not bundle all migration scripts unnecessarily.
Checklist
- All values are hardcoded inline (no imports from
src/) - Input and output typed as
any - No calls to factory functions or helpers
- Default values are literal objects, not references to constants
- Migration is idempotent (safe to re-run)
- Any record the migration seeds carries every field the app resolves at creation time — a migration runs before i18n is initialized and may not import the facade, so a localized field it omits stays blank forever (see
v098-to-v099.ts, which had to repair exactly that) - Auto-discovered registries validate
from -> tocontinuity and duplicate targets - Migration-aware storage logic is isolated from generic read paths