Amazing things with pikapkg and tree shaking

AgentMemoryRepo.js

import AgentRepo from './AgentRepo'

class AgentMemoryRepo extends AgentRepo {
  load() {
  }
}

AgentMemoryRepo.test.js

import AgentRepo, {contract} from './AgentRepo'
import AgentMemoryRepo from './AgentMemoryRepo'

describe('AgentMemoryRepo', () => {
  contract(() => new AgentMemoryRepo())
  
  it('can be created', () => expect(new AgentMemoryRepo()).toBeInstanceOf(AgentMemoryRepo))
})

AgentRepo.js

export default class AgentRepo {}

export function contract(builder) {
  it('can be created', () => expect(builder()).toBeInstanceOf(AgentRepo))

  it('exposes load method', () => {
    const a = builder()
    expect(a.load).toBeInstanceOf(Function)
  })
}

index.js

import AgentMemoryRepo from './AgentMemoryRepo.js'

const r = new AgentMemoryRepo()

console.log(r.load(1))