Go defer in JS by try ... finally ...

index.ts

describe('finally', () => {
  it('1', () => {
    const ttt = () => {
      try {
        return true
      } finally {
        // eslint-disable-next-line no-unsafe-finally
        return false
      }
    }

    expect(ttt()).toBe(false)
  })
  it('2', () => {
    let res = false

    const ttt = () => {
      try {
        return false
      } finally {
        res = true
      }
    }

    expect(ttt()).toBe(false)
    expect(res).toBe(true)
  })
  it('3', () => {
    const ttt = () => {
      let res = false
      try {
        return res
      } finally {
        res = true
      }
    }

    const res = ttt()

    expect(res).toBe(false)
  })
  it('4', async () => {
    let res = false

    const ttt = async () => {
      try {
        return res
      } finally {
        res = true
      }
    }

    expect(await ttt()).toBe(false)
    expect(res).toBe(true)
  })
})