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import { describe, expectTypeOf, test } from 'vitest'
import { sleep } from '@tanstack/query-test-utils'
import { injectMutation } from '..'
import type { Signal } from '@angular/core'
describe('Discriminated union return type', () => {
test('data should be possibly undefined by default', () => {
const mutation = injectMutation(() => ({
mutationFn: () => sleep(0).then(() => 'string'),
}))
expectTypeOf(mutation.data).toEqualTypeOf<Signal<string | undefined>>()
})
test('data should be defined when mutation is success', () => {
const mutation = injectMutation(() => ({
mutationFn: () => sleep(0).then(() => 'string'),
}))
if (mutation.isSuccess()) {
expectTypeOf(mutation.data).toEqualTypeOf<Signal<string>>()
}
})
test('error should be null when mutation is success', () => {
const mutation = injectMutation(() => ({
mutationFn: () => sleep(0).then(() => 'string'),
}))
if (mutation.isSuccess()) {
expectTypeOf(mutation.error).toEqualTypeOf<Signal<null>>()
}
})
test('data should be undefined when mutation is pending', () => {
const mutation = injectMutation(() => ({
mutationFn: () => sleep(0).then(() => 'string'),
}))
if (mutation.isPending()) {
expectTypeOf(mutation.data).toEqualTypeOf<Signal<undefined>>()
}
})
test('error should be defined when mutation is error', () => {
const mutation = injectMutation(() => ({
mutationFn: () => sleep(0).then(() => 'string'),
}))
if (mutation.isError()) {
expectTypeOf(mutation.error).toEqualTypeOf<Signal<Error>>()
}
})
test('should narrow variables', () => {
const mutation = injectMutation(() => ({
mutationFn: (_variables: string) => sleep(0).then(() => 'string'),
}))
if (mutation.isIdle()) {
expectTypeOf(mutation.variables).toEqualTypeOf<Signal<undefined>>()
}
if (mutation.isPending()) {
expectTypeOf(mutation.variables).toEqualTypeOf<Signal<string>>()
}
if (mutation.isSuccess()) {
expectTypeOf(mutation.variables).toEqualTypeOf<Signal<string>>()
}
expectTypeOf(mutation.variables).toEqualTypeOf<Signal<string | undefined>>()
})
})
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