@revisium/engine

Git-like version control engine for structured data.

What is this?

A NestJS module library that provides Git-like versioning for structured data: branches, revisions, tables, rows, JSON Schema validation, diffs, formula plugins, and migrations.

Extracted from @revisium/core. No auth, no billing, no API controllers — pure versioning engine.

Usage

import { EngineModule, EngineApiService } from '@revisium/engine';

@Module({ imports: [EngineModule.forRoot()] })
export class AppModule {}

@Injectable()
export class MyService {
  constructor(private readonly engine: EngineApiService) {}

  async example() {
    await this.engine.createTable({ revisionId, tableId: 'products', schema });
    await this.engine.createRow({ revisionId, tableId, rowId, data });
    await this.engine.getRows({ revisionId, tableId, first: 100 });
    await this.engine.createRevision({ projectId, branchName, comment });
    await this.engine.revisionChanges({ revisionId });
    await this.engine.cleanOrphanedData();
  }
}

With file storage

Provide your own IStorageService implementation (S3, local filesystem, etc.):

import { EngineModule, IStorageService } from '@revisium/engine';

const myStorage: IStorageService = {
  isAvailable: true,
  canServeFiles: false,
  uploadFile: (file, path) => s3Client.upload(file, path),
  getPublicUrl: (key) => `https://cdn.example.com/${key}`,
};

@Module({ imports: [EngineModule.forRoot({ storage: myStorage })] })
export class AppModule {}

Without a storage provider, file operations throw "Storage is not configured".

Data Model

Branch (projectId: string)
  └── Revision (head, draft, start)
        └── Table (schema: JSON Schema)
              └── Row (data: JSON, hash, meta)

Documentation

• API Reference — all EngineApiService methods with inputs/outputs
• Integration Guide — how to use in your NestJS app
• Versioning System — data model, copy-on-write, commit/revert, invariants

Development

npm ci
docker compose -f docker/docker-compose.yml up -d
cp .env.example .env
npm run prisma:generate
npm run start:dev

Script	Description
npm run tsc	Type check
npm run lint:ci	ESLint (0 warnings)
npm test	Run tests (1100+ tests)
npm run build	Production build

Tech Stack

NestJS 11, TypeScript 5.9, PostgreSQL 17, Prisma 7, CQRS, Jest + SWC, ESLint 9, SonarQube

License

Apache-2.0