84 lines
2.2 KiB
Plaintext
84 lines
2.2 KiB
Plaintext
import { Tuple } from '@reduxjs/toolkit'
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describe('type tests', () => {
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test('compatibility is checked between described types', () => {
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const stringTuple = new Tuple('')
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expectTypeOf(stringTuple).toEqualTypeOf<Tuple<[string]>>()
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expectTypeOf(stringTuple).toMatchTypeOf<Tuple<string[]>>()
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expectTypeOf(stringTuple).not.toMatchTypeOf<Tuple<[string, string]>>()
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const numberTuple = new Tuple(0, 1)
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expectTypeOf(numberTuple).not.toMatchTypeOf<Tuple<string[]>>()
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})
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test('concat is inferred properly', () => {
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const singleString = new Tuple('')
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expectTypeOf(singleString).toEqualTypeOf<Tuple<[string]>>()
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expectTypeOf(singleString.concat('')).toEqualTypeOf<
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Tuple<[string, string]>
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>()
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expectTypeOf(singleString.concat([''] as const)).toMatchTypeOf<
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Tuple<[string, string]>
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>()
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})
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test('prepend is inferred properly', () => {
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const singleString = new Tuple('')
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expectTypeOf(singleString).toEqualTypeOf<Tuple<[string]>>()
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expectTypeOf(singleString.prepend('')).toEqualTypeOf<
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Tuple<[string, string]>
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>()
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expectTypeOf(singleString.prepend([''] as const)).toMatchTypeOf<
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Tuple<[string, string]>
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>()
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})
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test('push must match existing items', () => {
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const stringTuple = new Tuple('')
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expectTypeOf(stringTuple.push).toBeCallableWith('')
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expectTypeOf(stringTuple.push).parameter(0).not.toBeNumber()
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})
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test('Tuples can be combined', () => {
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const stringTuple = new Tuple('')
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const numberTuple = new Tuple(0, 1)
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expectTypeOf(stringTuple.concat(numberTuple)).toEqualTypeOf<
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Tuple<[string, number, number]>
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>()
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expectTypeOf(stringTuple.prepend(numberTuple)).toEqualTypeOf<
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Tuple<[number, number, string]>
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>()
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expectTypeOf(numberTuple.concat(stringTuple)).toEqualTypeOf<
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Tuple<[number, number, string]>
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>()
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expectTypeOf(numberTuple.prepend(stringTuple)).toEqualTypeOf<
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Tuple<[string, number, number]>
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>()
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expectTypeOf(stringTuple.prepend(numberTuple)).not.toMatchTypeOf<
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Tuple<[string, number, number]>
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>()
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expectTypeOf(stringTuple.concat(numberTuple)).not.toMatchTypeOf<
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Tuple<[number, number, string]>
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>()
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})
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})
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