group events

2025-12-19 13:14:04 +01:00 · 2025-12-19 13:14:04 +01:00 · e05ab13d0d
commit e05ab13d0d
parent 5a08e2319f
16 changed files with 442 additions and 101 deletions
--- a/costly-api/README.md
+++ b/costly-api/README.md
@ -1,98 +1,194 @@
-<p align="center">
-  <a href="http://nestjs.com/" target="blank"><img src="https://nestjs.com/img/logo-small.svg" width="120" alt="Nest Logo" /></a>
-</p>
+# Costly – Architektur & Entscheidungsgrundlagen

-[circleci-image]: https://img.shields.io/circleci/build/github/nestjs/nest/master?token=abc123def456
-[circleci-url]: https://circleci.com/gh/nestjs/nest
+## Ziel des Projekts
+Costly ist eine **Offline-fähige PWA zur Aufteilung von Gruppenausgaben**.

-  <p align="center">A progressive <a href="http://nodejs.org" target="_blank">Node.js</a> framework for building efficient and scalable server-side applications.</p>
-    <p align="center">
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-</p>
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+Kernanforderungen:
+- Gruppen ohne Accounts (Join per Invite)
+- Offline Änderungen möglich
+- Späterer Sync ohne Datenverlust
+- Erweiterbar für Konflikte, Undo, Mehrgeräte-Nutzung

-## Description
+---

-[Nest](https://github.com/nestjs/nest) framework TypeScript starter repository.
+## Architektur – Überblick

-## Project setup
+Costly nutzt eine **Hybrid Event-Driven Architektur**:

-```bash
-$ npm install
+- **Events sind die Quelle der Wahrheit**
+- **Relationale Tabellen sind Read-Models**
+- Offline-Sync basiert auf **append-only Events**
+
+### Überblick
+Client
+├─ Offline Outbox (Events)
+├─ UI arbeitet mit aktuellem State
+└─ Sync: sendet Events + holt neue Events
+
+Server
+├─ Event Store (group_events, expense_events, ...)
+├─ Read Models (groups, expenses, ...)
+└─ Projektion: Events → State
+
+yaml
+Code kopieren
+
+---
+
+## Warum Events?
+### Nicht: „Wie sieht der Zustand aus?“  
+### Sondern: „Was ist passiert?“
+
+Beispiel:
+- ❌ `Group.name = "Trip"`
+- ✅ `GROUP_RENAMED { from: "Urlaub", to: "Trip" }`
+
+### Vorteile
+- Offline-Änderungen lassen sich sicher synchronisieren
+- Events sind idempotent (keine Doppeländerungen)
+- Konflikte sind sichtbar und erklärbar
+- Undo / Replay später möglich
+- Debugging & Audit inklusive
+
+---
+
+## Event-Log vs. History
+- `group_events` **ersetzt** klassische `group_history`
+- Keine doppelte Speicherung
+- Events *sind* die History
+
+Merksatz:
+> **History sagt, was ist.  
+> Events sagen, was passiert ist.**
+
+---
+
+## Hybrid-Ansatz (bewusst gewählt)
+Costly ist **kein dogmatisches Event Sourcing**.
+
+Wir nutzen:
+- ✅ Events als Quelle der Wahrheit
+- ✅ Materialisierte Tabellen (`groups`, `expenses`) für schnelle Queries
+
+➡️ Best of both worlds.
+
+---
+
+## Aktueller Konflikt-Ansatz
+**Last-write-wins**, basierend auf Server-Reihenfolge der Events.
+
+- Client, der später synchronisiert, kann frühere Änderungen überschreiben
+- Das ist **bewusst akzeptiert** fürs MVP
+
+Spätere Erweiterung möglich (siehe unten).
+
+---
+
+## Event-Grundstruktur
+```ts
+GroupEvent {
+  id: string;            // vom Client generiert (UUID/ULID)
+  groupId: string;
+  type: string;          // z.B. GROUP_CREATED, GROUP_RENAMED
+  payload: object;       // fachliche Daten
+  actorId?: string;      // deviceId / memberId
+  createdAt: Date;       // Server-Zeit
+}
 ```
+## Warum Client-generierte IDs?
+### Ermöglicht Idempotenz

-## Compile and run the project
+- Events können gefahrlos erneut gesendet werden
+- Wichtig für Offline-Retry
+### Warum es weiterhin REST-Endpunkte gibt
+Es gibt z. B.:
+- PATCH /groups/:id/name
+Diese Endpunkte:
+- validieren Input
+- prüfen Regeln
+- erzeugen intern Events

-```bash
-# development
-$ npm run start
+Der Client muss Events nicht kennen, solange er online ist.

-# watch mode
-$ npm run start:dev
+➡️ Später können Offline-Events direkt an /events/batch geschickt werden.

-# production mode
-$ npm run start:prod
+## Transaktionen – aktueller Stand
+Jede fachliche Aktion läuft atomar:
+- Event wird gespeichert
+- Read Model wird aktualisiert
+- Beides in einer DB-Transaktion
+
+Beispiel:
+
+```sql
+Code kopieren
+renameGroup()
+ ├─ UPDATE groups
+ └─ INSERT group_events
 ```
+### Erweiterung: Optimistic Concurrency (später)
+Problem:
+- Zwei Geräte ändern offline denselben Wert

-## Run tests
+Lösung:
+- Client sendet zusätzlich expectedLastEventId
+- Server prüft:
+  - passt → akzeptieren
+  - passt nicht → 409 Conflict

-```bash
-# unit tests
-$ npm run test
+Das ist ohne Architekturwechsel möglich, weil Events genutzt werden.

-# e2e tests
-$ npm run test:e2e
+## Erweiterung: Transaktionen als Event-Gruppe
+Wenn später komplexe Änderungen kommen (z. B. mehrere Expenses auf einmal):

-# test coverage
-$ npm run test:cov
+Idee
+Mehrere Events gehören logisch zusammen.
+
+```ts
+{
+  transactionId: "tx-123",
+  type: "EXPENSE_CREATED"
+}
+{
+  transactionId: "tx-123",
+  type: "EXPENSE_SPLIT_UPDATED"
+}
 ```
+### Möglichkeiten:

-## Deployment
+Server behandelt Events mit gleicher transactionId atomar
+- Undo / Rollback pro Transaktion möglich
+- UI kann „eine Aktion“ anzeigen statt viele Events

-When you're ready to deploy your NestJS application to production, there are some key steps you can take to ensure it runs as efficiently as possible. Check out the [deployment documentation](https://docs.nestjs.com/deployment) for more information.
+### Erweiterung: Undo / Replay
+Da Events append-only sind:
+- Undo = Gegen-Event
+- Replay = Events neu anwenden → State neu aufbauen

-If you are looking for a cloud-based platform to deploy your NestJS application, check out [Mau](https://mau.nestjs.com), our official platform for deploying NestJS applications on AWS. Mau makes deployment straightforward and fast, requiring just a few simple steps:
+Beispiel:
+- GROUP_RENAMED (A → B)
+- Undo → GROUP_RENAMED (B → A)

-```bash
-$ npm install -g @nestjs/mau
-$ mau deploy
-```
+Wichtige Designregeln
+- Repositories kennen keine Events
+- Services orchestrieren State + Event
+- Events sind append-only
+- Read Models dürfen neu aufgebaut werden
+- Keine Logik im Controller

-With Mau, you can deploy your application in just a few clicks, allowing you to focus on building features rather than managing infrastructure.
+Warum das alles?
+Weil Costly:
+- offline funktionieren soll
+- ohne Accounts auskommen soll
+- später wachsen können soll
+- aber jetzt schon stabil sein muss

-## Resources
+Diese Architektur ist der kleinste sinnvolle Schritt, um das zu erreichen.

-Check out a few resources that may come in handy when working with NestJS:
-
- Visit the [NestJS Documentation](https://docs.nestjs.com) to learn more about the framework.
- For questions and support, please visit our [Discord channel](https://discord.gg/G7Qnnhy).
- To dive deeper and get more hands-on experience, check out our official video [courses](https://courses.nestjs.com/).
- Deploy your application to AWS with the help of [NestJS Mau](https://mau.nestjs.com) in just a few clicks.
- Visualize your application graph and interact with the NestJS application in real-time using [NestJS Devtools](https://devtools.nestjs.com).
- Need help with your project (part-time to full-time)? Check out our official [enterprise support](https://enterprise.nestjs.com).
- To stay in the loop and get updates, follow us on [X](https://x.com/nestframework) and [LinkedIn](https://linkedin.com/company/nestjs).
- Looking for a job, or have a job to offer? Check out our official [Jobs board](https://jobs.nestjs.com).
-
-## Support
-
-Nest is an MIT-licensed open source project. It can grow thanks to the sponsors and support by the amazing backers. If you'd like to join them, please [read more here](https://docs.nestjs.com/support).
-
-## Stay in touch
-
- Author - [Kamil Myśliwiec](https://twitter.com/kammysliwiec)
- Website - [https://nestjs.com](https://nestjs.com/)
- Twitter - [@nestframework](https://twitter.com/nestframework)
-
-## License
-
-Nest is [MIT licensed](https://github.com/nestjs/nest/blob/master/LICENSE).
+## Status
+- [x]Groups als Events
+- [x] Rename als Event
+- [ ] Expenses als Events
+- [ ] Client-Outbox (IndexedDB)
+- [ ] Sync Pull (GET /events?since=...)
+- [ ] Conflict Handling (optional)
--- a/costly-api/package-lock.json
+++ b/costly-api/package-lock.json
@ -19,7 +19,8 @@
        "mysql2": "^3.16.0",
        "reflect-metadata": "^0.2.2",
        "rxjs": "^7.8.1",
-        "typeorm": "^0.3.28"
+        "typeorm": "^0.3.28",
+        "ulid": "^3.0.2"
      },
      "devDependencies": {
        "@eslint/eslintrc": "^3.2.0",
@ -11467,6 +11468,15 @@
        "url": "https://github.com/sponsors/sindresorhus"
      }
    },
+    "node_modules/ulid": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/ulid/-/ulid-3.0.2.tgz",
+      "integrity": "sha512-yu26mwteFYzBAot7KVMqFGCVpsF6g8wXfJzQUHvu1no3+rRRSFcSV2nKeYvNPLD2J4b08jYBDhHUjeH0ygIl9w==",
+      "license": "MIT",
+      "bin": {
+        "ulid": "dist/cli.js"
+      }
+    },
    "node_modules/unbzip2-stream": {
      "version": "1.4.3",
      "resolved": "https://registry.npmjs.org/unbzip2-stream/-/unbzip2-stream-1.4.3.tgz",
--- a/costly-api/package.json
+++ b/costly-api/package.json
@ -30,7 +30,8 @@
    "mysql2": "^3.16.0",
    "reflect-metadata": "^0.2.2",
    "rxjs": "^7.8.1",
-    "typeorm": "^0.3.28"
+    "typeorm": "^0.3.28",
+    "ulid": "^3.0.2"
  },
  "devDependencies": {
    "@eslint/eslintrc": "^3.2.0",
--- a/costly-api/src/database/database.module.ts
+++ b/costly-api/src/database/database.module.ts
@ -2,8 +2,9 @@ import { Module } from '@nestjs/common';
 import { ConfigModule, ConfigService } from '@nestjs/config';
 import { TypeOrmModule } from '@nestjs/typeorm';
 import { GroupEntity } from '../groups/persistence/group.entity';
+import { GroupEventEntity } from 'src/groups/persistence/group-event.entity';

-const ENTITY = [GroupEntity]
+const ENTITY = [GroupEntity, GroupEventEntity]

@Module({
  imports: [
@ -19,7 +20,7 @@ const ENTITY = [GroupEntity]
          password: configService.get('DATABASE_PASSWORD'),
          database: configService.get('DATABASE_NAME'),
          entities: ENTITY,
-          synchronize: true,
+          synchronize: (configService.get('DATABASE_SYNC')||'').toLowerCase() == 'true',
      })
    })
  ],
--- a/costly-api/src/groups/api/groups.controller.ts
+++ b/costly-api/src/groups/api/groups.controller.ts
@ -1,15 +1,43 @@
-import { Body, Controller, Post } from "@nestjs/common";
+import { Body, Controller, Get, Param, Patch, Post } from "@nestjs/common";
 import { CreateGroupDto } from "../dto/create-group.dto";
 import { GroupsService } from "../application/groups.service";
+import { RenameGroupDto } from "../dto/rename-group.dto";
+import { IncomingEventDto } from "src/model/dto/incoming-event.dto";
+import { ulid } from 'ulid';

@Controller({path: 'groups'})
 export class GroupsController {

  constructor(private groupsService: GroupsService) {}

+  @Get()
+  getGroups() {
+    return this.groupsService.getAll();
+  }
+
  @Post()
-createGroup(@Body() dto: CreateGroupDto) {
+  createGroup(@Body() dto: CreateGroupDto) {
    return this.groupsService.create(dto);
-}
+  }
+
+  @Patch(':id/name')
+  rename(@Param('id') id: string, @Body() dto: RenameGroupDto) {
+    // actorId später z.B. aus Header/Cookie ziehen
+    const event: IncomingEventDto = {
+      id: ulid(),
+      payload: { to: dto.name },
+      type: 'GROUP_RENAMED',
+      actorId: undefined
+    }
+    return this.ingest(id, [event])
+  }
+
+  @Post(':groupId/events/batch')
+  ingest(
+    @Param('groupId') groupId: string,
+    @Body() events: IncomingEventDto[],
+  ) {
+    return this.groupsService.ingestEvents(groupId, events);
+  }

 }
--- a/costly-api/src/groups/application/groups.service.ts
+++ b/costly-api/src/groups/application/groups.service.ts
@ -1,10 +1,16 @@
 import { Injectable, NotFoundException } from "@nestjs/common";
 import { GroupsRepository } from "../persistence/group.repository";
 import { CreateGroupDto } from "../dto/create-group.dto";
+import { UpdateGroupDto } from "../dto/update-group.dto";
+import { DataSource } from "typeorm";
+import { GroupEntity } from "../persistence/group.entity";
+import { GroupEventEntity } from "../persistence/group-event.entity";
+import { ulid } from 'ulid';
+import { IncomingEventDto } from "src/model/dto/incoming-event.dto";

@Injectable()
 export class GroupsService {
-  constructor(private readonly groups: GroupsRepository) {}
+  constructor(private readonly dataSource: DataSource, private readonly groups: GroupsRepository) {}

  async join(id: string) {
    const group = await this.groups.findById(id);
@ -12,7 +18,93 @@ export class GroupsService {
    return group;
  }

-  async create(dto: CreateGroupDto) {
-    return this.groups.create(dto);
+async create(dto: CreateGroupDto, actorId?: string) {
+  return this.dataSource.transaction(async (manager) => {
+    const created = await this.groups.createGroup(dto, manager);
+
+    await manager.getRepository(GroupEventEntity).save({
+      id: ulid(),
+      groupId: created.id,
+      type: 'GROUP_CREATED',
+      actorId,
+      payload: {
+        name: created.name,
+      },
+    });
+
+    return created;
+  });
+}
+
+  async getAll() {
+    return this.groups.all();
+  }
+
+  // async rename(groupId: string, newName: string, actorId?: string) {
+  //   return this.dataSource.transaction(async (manager) => {
+  //     const group = await this.groups.findByIdOrFail(groupId, manager);
+
+  //     const from = group.name;
+  //     const to = newName;
+
+  //     // optional: wenn gleich, nix tun (oder trotzdem eventen, wie du willst)
+  //     if (from === to) return group;
+
+  //     group.name = to;
+  //     const saved = await this.groups.save(group, manager);
+
+  //     await manager.getRepository(GroupEventEntity).save({
+  //       id: ulid(),
+  //       groupId: saved.id,
+  //       type: 'GROUP_RENAMED',
+  //       actorId,
+  //       payload: { from, to },
+  //     });
+
+  //     return saved;
+  //   });
+  // }
+
+  async ingestEvents(groupId: string, events: IncomingEventDto[]) {
+    return this.dataSource.transaction(async (manager) => {
+      const eventsRepo = manager.getRepository(GroupEventEntity);
+      const groupsRepo = manager.getRepository(GroupEntity);
+
+      // 1) Events persistieren (idempotent)
+      // -> INSERT IGNORE: wenn id schon da, wird es ignoriert
+      await manager
+        .createQueryBuilder()
+        .insert()
+        .into(GroupEventEntity)
+        .values(events.map(e => ({
+          id: e.id,
+          groupId,
+          type: e.type as any,
+          payload: e.payload,
+          actorId: e.actorId,
+        })))
+        .orIgnore() // MySQL: INSERT IGNORE
+        .execute();
+
+      // 2) Jetzt nur die neu eingefügten Events anwenden
+      // Trick: hole Events anhand IDs aus DB und wende in stabiler Reihenfolge an
+      const persisted = await eventsRepo.find({
+        where: { id: events.map(e => e.id) as any },
+        order: { createdAt: 'ASC' },
+      });
+
+      // optional: nur diejenigen anwenden, die "gerade neu" sind
+      // (Wenn du ganz sauber sein willst: execute() liefert affected, aber nicht IDs.
+      //  Pragmatik: apply ist idempotent, dann ist doppelt anwenden ok, aber nur wenn Operationen idempotent sind!)
+      for (const ev of persisted) {
+        if (ev.type === 'GROUP_RENAMED') {
+          const group = await groupsRepo.findOneByOrFail({ id: groupId });
+          group.name = ev.payload.to;
+          await groupsRepo.save(group);
+        }
+      }
+
+      return { accepted: events.length };
+    });
  }
 }
--- a/costly-api/src/groups/dto/rename-group.dto.ts
+++ b/costly-api/src/groups/dto/rename-group.dto.ts
@ -0,0 +1,8 @@
+import { IsString, IsNotEmpty, Length } from 'class-validator';
+
+export class RenameGroupDto {
+  @IsString()
+  @IsNotEmpty()
+  @Length(1, 100)
+  name: string;
+}
--- a/costly-api/src/groups/dto/update-group.dto.ts
+++ b/costly-api/src/groups/dto/update-group.dto.ts
@ -0,0 +1,6 @@
+import { IsOptional, IsString, Length } from "class-validator";
+
+export class UpdateGroupDto {
+  @IsOptional() @IsString() @Length(1, 100)
+  name?: string;
+}
--- a/costly-api/src/groups/groups.module.ts
+++ b/costly-api/src/groups/groups.module.ts
@ -4,9 +4,10 @@ import { GroupEntity } from './persistence/group.entity';
 import { GroupsController } from './api/groups.controller';
 import { GroupsService } from './application/groups.service';
 import { GroupsRepository } from './persistence/group.repository';
+import { GroupEventEntity } from './persistence/group-event.entity';

@Module({
-  imports: [TypeOrmModule.forFeature([GroupEntity])],
+  imports: [TypeOrmModule.forFeature([GroupEntity, GroupEventEntity])],
  controllers: [GroupsController],
  providers: [GroupsService, GroupsRepository]
 })
--- a/costly-api/src/groups/persistence/group-event.entity.ts
+++ b/costly-api/src/groups/persistence/group-event.entity.ts
@ -0,0 +1,29 @@
+import { Entity, PrimaryColumn, Column, CreateDateColumn, Index } from 'typeorm';
+
+export type GroupEventType =
+  | 'GROUP_CREATED'
+  | 'GROUP_RENAMED'
+  | 'GROUP_INVITE_ROTATED'
+  | 'GROUP_DELETED';
+
+@Entity('group_events')
+@Index(['groupId', 'createdAt'])
+export class GroupEventEntity {
+  @PrimaryColumn()
+  id: string; // ULID oder UUID, kommt vom Server oder Client
+
+  @Column()
+  groupId: string;
+
+  @Column({ type: 'varchar', length: 64 })
+  type: GroupEventType;
+
+  @Column({ type: 'json' })
+  payload: any;
+
+  @Column({ nullable: true })
+  actorId?: string;
+
+  @CreateDateColumn()
+  createdAt: Date;
+}
--- a/costly-api/src/groups/persistence/group.entity.ts
+++ b/costly-api/src/groups/persistence/group.entity.ts
@ -1,4 +1,4 @@
-import { Column, Entity, PrimaryGeneratedColumn } from "typeorm";
+import { Column, CreateDateColumn, Entity, PrimaryGeneratedColumn, UpdateDateColumn } from "typeorm";

@Entity('groups')
 export class GroupEntity {
@ -6,7 +6,13 @@ export class GroupEntity {
  @PrimaryGeneratedColumn('uuid')
  id: string;

-  @Column({nullable: false})
+  @Column({ nullable: false })
  name: string;

+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ name: 'updated_at' })
+  updatedAt: Date;
+
 }
--- a/costly-api/src/groups/persistence/group.repository.ts
+++ b/costly-api/src/groups/persistence/group.repository.ts
@ -1,8 +1,9 @@
 import { Injectable } from "@nestjs/common";
 import { InjectRepository } from "@nestjs/typeorm";
-import { Repository } from "typeorm";
+import { EntityManager, Repository } from "typeorm";
 import { GroupEntity } from "./group.entity";
 import { CreateGroupDto } from "../dto/create-group.dto";
+import { UpdateGroupDto } from "../dto/update-group.dto";

@Injectable()
 export class GroupsRepository {
@ -11,15 +12,36 @@ export class GroupsRepository {
    private readonly repo: Repository<GroupEntity>,
  ) {}

-  save(group: GroupEntity) {
-    return this.repo.save(group);
-  }
-
  findById(id: string) {
    return this.repo.findOne({ where: { id } });
  }

-  create(dto: CreateGroupDto) {
-    return this.repo.save(this.repo.create(dto))
+  all() {
+    return this.repo.find();
+  }
+
+createGroup(
+    dto: CreateGroupDto,
+    manager?: EntityManager,
+  ): Promise<GroupEntity> {
+    const r = manager ? manager.getRepository(GroupEntity) : this.repo;
+
+    const group = r.create({
+      name: dto.name,
+    });
+
+    return r.save(group);
+  }
+
+  private getRepo(manager?: EntityManager) {
+    return manager ? manager.getRepository(GroupEntity) : this.repo;
+  }
+
+  async findByIdOrFail(id: string, manager?: EntityManager) {
+    return this.getRepo(manager).findOneByOrFail({ id });
+  }
+
+  async save(group: GroupEntity, manager?: EntityManager) {
+    return this.getRepo(manager).save(group);
  }
 }
--- a/costly-api/src/model/dto/incoming-event.dto.ts
+++ b/costly-api/src/model/dto/incoming-event.dto.ts
@ -0,0 +1,15 @@
+import { IsString, IsObject, IsOptional, IsISO8601 } from "class-validator";
+
+export type GROUPEVENTTYPE = 'GROUP_RENAMED'
+
+export class IncomingEventDto {
+  @IsString() id: string;
+  @IsString() type: GROUPEVENTTYPE;
+  @IsObject() payload: any;
+
+  @IsOptional() @IsString()
+  actorId?: string;
+
+  @IsOptional() @IsISO8601()
+  clientCreatedAt?: string;
+}
--- a/dddocker-compose.yml
+++ b/dddocker-compose.yml
@ -1,26 +1,26 @@
 services:
  frontend:
    build:
-      context: ./frontend
-    image: gitea.bastian-wagner.dev/bastian/valgard/frontend:latest
+      context: ./costly-api
+    image: gitea.forgecore.work/bastian/costly/costly-client:latest
    networks:
      - internal

  backend:
    build: 
      context: ./backend
-    image: gitea.bastian-wagner.dev/bastian/valgard/backend:latest
+    image: gitea.forgecore.work/bastian/costly/costly-api:latest
    networks:
      - internal

  nginx:
-    image: gitea.bastian-wagner.dev/bastian/valgard/nginx:latest
+    image: gitea.forgecore.work/bastian/costly/nginx:latest
    build:
      context: ./nginx
    ports:
-      - "8081:80"
+      - "8082:80"
    volumes:
-      - ./nginx/default.conf:/etc/nginx/conf.d/default.conf
+      - ./nginx.conf:/etc/nginx/conf.d/default.conf
    depends_on:
      - frontend
      - backend
--- a/package-lock.json
+++ b/package-lock.json
@ -0,0 +1,21 @@
+{
+  "name": "costly",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "dependencies": {
+        "ulid": "^3.0.2"
+      }
+    },
+    "node_modules/ulid": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/ulid/-/ulid-3.0.2.tgz",
+      "integrity": "sha512-yu26mwteFYzBAot7KVMqFGCVpsF6g8wXfJzQUHvu1no3+rRRSFcSV2nKeYvNPLD2J4b08jYBDhHUjeH0ygIl9w==",
+      "license": "MIT",
+      "bin": {
+        "ulid": "dist/cli.js"
+      }
+    }
+  }
+}
--- a/package.json
+++ b/package.json
@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "ulid": "^3.0.2"
+  }
+}