repo stringlengths 7 64 | file_url stringlengths 81 338 | file_path stringlengths 5 257 | content stringlengths 0 32.8k | language stringclasses 1
value | license stringclasses 7
values | commit_sha stringlengths 40 40 | retrieved_at stringdate 2026-01-04 15:25:31 2026-01-05 01:50:38 | truncated bool 2
classes |
|---|---|---|---|---|---|---|---|---|
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00270-hard-typed-get/template.ts | questions/00270-hard-typed-get/template.ts | type Get<T, K> = string
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/27862-medium-cartesianproduct/test-cases.ts | questions/27862-medium-cartesianproduct/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<CartesianProduct<1 | 2, 'a' | 'b'>, [2, 'a'] | [1, 'a'] | [2, 'b'] | [1, 'b']>>,
Expect<Equal<CartesianProduct<1 | 2 | 3, 'a' | 'b' | 'c' >, [2, 'a'] | [1, 'a'] | [3, 'a'] | [2, 'b'] | [1, 'b'] | [3, 'b'] | [2, 'c'] | [1, 'c'] ... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/27862-medium-cartesianproduct/template.ts | questions/27862-medium-cartesianproduct/template.ts | type CartesianProduct<T, U> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00529-medium-absolute/test-cases.ts | questions/00529-medium-absolute/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<Absolute<0>, '0'>>,
Expect<Equal<Absolute<-0>, '0'>>,
Expect<Equal<Absolute<10>, '10'>>,
Expect<Equal<Absolute<-5>, '5'>>,
Expect<Equal<Absolute<'0'>, '0'>>,
Expect<Equal<Absolute<'-0'>, '0'>>,
Expect<Equal<Absolute<'... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00529-medium-absolute/template.ts | questions/00529-medium-absolute/template.ts | type Absolute<T extends number | string | bigint> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00925-extreme-assert-array-index/test-cases.ts | questions/00925-extreme-assert-array-index/test-cases.ts | const matrix = [
[3, 4],
[5, 6],
[7, 8],
]
assertArrayIndex(matrix, 'rows')
let sum = 0
for (let i = 0 as Index<typeof matrix>; i < matrix.length; i += 1) {
const columns: number[] = matrix[i]
// @ts-expect-error: number | undefined in not assignable to number
const x: number[] = matrix[0]
assertArra... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00925-extreme-assert-array-index/template.ts | questions/00925-extreme-assert-array-index/template.ts | function assertArrayIndex(array: readonly unknown[], key: string) {}
type Index<Array> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/01978-medium-percentage-parser/test-cases.ts | questions/01978-medium-percentage-parser/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type Case0 = ['', '', '']
type Case1 = ['+', '', '']
type Case2 = ['+', '1', '']
type Case3 = ['+', '100', '']
type Case4 = ['+', '100', '%']
type Case5 = ['', '100', '%']
type Case6 = ['-', '100', '%']
type Case7 = ['-', '100', '']
type Case8 = ['-', '1', ''... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/01978-medium-percentage-parser/template.ts | questions/01978-medium-percentage-parser/template.ts | type PercentageParser<A extends string> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/29785-medium-deep-omit/test-cases.ts | questions/29785-medium-deep-omit/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type obj = {
person: {
name: string
age: {
value: number
}
}
}
type cases = [
Expect<Equal<DeepOmit<obj, 'person'>, {}>>,
Expect<Equal<DeepOmit<obj, 'person.name'>, { person: { age: { value: number } } }>>,
Expect<Equal<DeepOmit<o... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/29785-medium-deep-omit/template.ts | questions/29785-medium-deep-omit/template.ts | type DeepOmit = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/25747-hard-isnegativenumber/test-cases.ts | questions/25747-hard-isnegativenumber/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<IsNegativeNumber<0>, false>>,
Expect<Equal<IsNegativeNumber<number>, never>>,
Expect<Equal<IsNegativeNumber<-1 | -2>, never>>,
Expect<Equal<IsNegativeNumber<-1>, true>>,
Expect<Equal<IsNegativeNumber<-1.9>, true>>,
Expe... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/25747-hard-isnegativenumber/template.ts | questions/25747-hard-isnegativenumber/template.ts | type IsNegativeNumber<T extends number> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/02852-medium-omitbytype/test-cases.ts | questions/02852-medium-omitbytype/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
interface Model {
name: string
count: number
isReadonly: boolean
isEnable: boolean
}
type cases = [
Expect<Equal<OmitByType<Model, boolean>, { name: string, count: number }>>,
Expect<Equal<OmitByType<Model, string>, { count: number, isReadonly: b... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/02852-medium-omitbytype/template.ts | questions/02852-medium-omitbytype/template.ts | type OmitByType<T, U> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/02070-medium-drop-char/test-cases.ts | questions/02070-medium-drop-char/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
// @ts-expect-error
Expect<Equal<DropChar<'butter fly!', ''>, 'butterfly!'>>,
Expect<Equal<DropChar<'butter fly!', ' '>, 'butterfly!'>>,
Expect<Equal<DropChar<'butter fly!', '!'>, 'butter fly'>>,
Expect<Equal<DropChar<' butter fly!... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/02070-medium-drop-char/template.ts | questions/02070-medium-drop-char/template.ts | type DropChar<S, C> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/35191-medium-trace/test-cases.ts | questions/35191-medium-trace/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<Trace<[[1, 2], [3, 4]]>, 1 | 4>>,
Expect<Equal<Trace<[[0, 1, 1], [2, 0, 2], [3, 3, 0]]>, 0>>,
Expect<Equal<Trace<[['a', 'b', ''], ['c', '', ''], ['d', 'e', 'f']]>, 'a' | '' | 'f'>>,
]
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/35191-medium-trace/template.ts | questions/35191-medium-trace/template.ts | type Trace<T extends any[][]> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00059-hard-get-optional/test-cases.ts | questions/00059-hard-get-optional/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<GetOptional<{ foo: number, bar?: string }>, { bar?: string }>>,
Expect<Equal<GetOptional<{ foo: undefined, bar?: undefined }>, { bar?: undefined }>>,
]
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00059-hard-get-optional/template.ts | questions/00059-hard-get-optional/template.ts | type GetOptional<T> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/09989-medium-tong-ji-shu-zu-zhong-de-yuan-su-ge-shu/test-cases.ts | questions/09989-medium-tong-ji-shu-zu-zhong-de-yuan-su-ge-shu/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<CountElementNumberToObject<[1, 2, 3, 4, 5]>, {
1: 1
2: 1
3: 1
4: 1
5: 1
} >>,
Expect<Equal<CountElementNumberToObject<[1, 2, 3, 4, 5, [1, 2, 3]]>, {
1: 2
2: 2
3: 2
4: 1
5: 1
}>>,
Ex... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/09989-medium-tong-ji-shu-zu-zhong-de-yuan-su-ge-shu/template.ts | questions/09989-medium-tong-ji-shu-zu-zhong-de-yuan-su-ge-shu/template.ts | type CountElementNumberToObject<T> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/02946-medium-objectentries/test-cases.ts | questions/02946-medium-objectentries/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
interface Model {
name: string
age: number
locations: string[] | null
}
type ModelEntries = ['name', string] | ['age', number] | ['locations', string[] | null]
type cases = [
Expect<Equal<ObjectEntries<Model>, ModelEntries>>,
Expect<Equal<ObjectEn... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/02946-medium-objectentries/template.ts | questions/02946-medium-objectentries/template.ts | type ObjectEntries<T> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00014-easy-first/test-cases.ts | questions/00014-easy-first/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<First<[3, 2, 1]>, 3>>,
Expect<Equal<First<[() => 123, { a: string }]>, () => 123>>,
Expect<Equal<First<[]>, never>>,
Expect<Equal<First<[undefined]>, undefined>>,
]
type errors = [
// @ts-expect-error
First<'notArray'>... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00014-easy-first/template.ts | questions/00014-easy-first/template.ts | type First<T extends any[]> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/08804-hard-two-sum/test-cases.ts | questions/08804-hard-two-sum/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<TwoSum<[3, 3], 6>, true>>,
Expect<Equal<TwoSum<[3, 2, 4], 6>, true>>,
Expect<Equal<TwoSum<[2, 7, 11, 15], 15>, false>>,
Expect<Equal<TwoSum<[2, 7, 11, 15], 9>, true>>,
Expect<Equal<TwoSum<[1, 2, 3], 0>, false>>,
Expect<... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/08804-hard-two-sum/template.ts | questions/08804-hard-two-sum/template.ts | type TwoSum<T extends number[], U extends number> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00151-extreme-query-string-parser/test-cases.ts | questions/00151-extreme-query-string-parser/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<ParseQueryString<''>, {}>>,
Expect<Equal<ParseQueryString<'k1'>, { k1: true }>>,
Expect<Equal<ParseQueryString<'k1&k1'>, { k1: true }>>,
Expect<Equal<ParseQueryString<'k1&k2'>, { k1: true, k2: true }>>,
Expect<Equal<Parse... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00151-extreme-query-string-parser/template.ts | questions/00151-extreme-query-string-parser/template.ts | type ParseQueryString = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00730-hard-union-to-tuple/test-cases.ts | questions/00730-hard-union-to-tuple/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type ExtractValuesOfTuple<T extends any[]> = T[keyof T & number]
type cases = [
Expect<Equal<UnionToTuple<'a' | 'b'>['length'], 2>>,
Expect<Equal<ExtractValuesOfTuple<UnionToTuple<'a' | 'b'>>, 'a' | 'b'>>,
Expect<Equal<ExtractValuesOfTuple<UnionToTuple... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00730-hard-union-to-tuple/template.ts | questions/00730-hard-union-to-tuple/template.ts | type UnionToTuple<T> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00055-hard-union-to-intersection/test-cases.ts | questions/00055-hard-union-to-intersection/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<UnionToIntersection<'foo' | 42 | true>, 'foo' & 42 & true>>,
Expect<Equal<UnionToIntersection<(() => 'foo') | ((i: 42) => true)>, (() => 'foo') & ((i: 42) => true)>>,
]
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00055-hard-union-to-intersection/template.ts | questions/00055-hard-union-to-intersection/template.ts | type UnionToIntersection<U> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/35045-medium-longest-common-prefix/test-cases.ts | questions/35045-medium-longest-common-prefix/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<LongestCommonPrefix<['flower', 'flow', 'flight']>, 'fl'>>,
Expect<Equal<LongestCommonPrefix<['dog', 'racecar', 'race']>, ''>>,
Expect<Equal<LongestCommonPrefix<['', '', '']>, ''>>,
Expect<Equal<LongestCommonPrefix<['a', '',... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/35045-medium-longest-common-prefix/template.ts | questions/35045-medium-longest-common-prefix/template.ts | type LongestCommonPrefix<T extends string[], P extends string = ''> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00645-medium-diff/test-cases.ts | questions/00645-medium-diff/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type Foo = {
name: string
age: string
}
type Bar = {
name: string
age: string
gender: number
}
type Coo = {
name: string
gender: number
}
type cases = [
Expect<Equal<Diff<Foo, Bar>, { gender: number }>>,
Expect<Equal<Diff<Bar, Foo>, { gende... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00645-medium-diff/template.ts | questions/00645-medium-diff/template.ts | type Diff<O, O1> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/02857-hard-isrequiredkey/test-cases.ts | questions/02857-hard-isrequiredkey/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<IsRequiredKey<{ a: number, b?: string }, 'a'>, true>>,
Expect<Equal<IsRequiredKey<{ a: undefined, b: string }, 'a'>, true>>,
Expect<Equal<IsRequiredKey<{ a: number, b?: string }, 'b'>, false>>,
Expect<Equal<IsRequiredKey<{ ... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/02857-hard-isrequiredkey/template.ts | questions/02857-hard-isrequiredkey/template.ts | type IsRequiredKey<T, K extends keyof T> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/06141-hard-binary-to-decimal/test-cases.ts | questions/06141-hard-binary-to-decimal/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<BinaryToDecimal<'10'>, 2>>,
Expect<Equal<BinaryToDecimal<'0011'>, 3>>,
Expect<Equal<BinaryToDecimal<'00000000'>, 0>>,
Expect<Equal<BinaryToDecimal<'11111111'>, 255>>,
Expect<Equal<BinaryToDecimal<'10101010'>, 170>>,
]
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/06141-hard-binary-to-decimal/template.ts | questions/06141-hard-binary-to-decimal/template.ts | type BinaryToDecimal<S extends string> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/09775-hard-capitalize-nest-object-keys/test-cases.ts | questions/09775-hard-capitalize-nest-object-keys/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type foo = {
foo: string
bars: [{ foo: string }]
}
type Foo = {
Foo: string
Bars: [{
Foo: string
}]
}
type cases = [
Expect<Equal<Foo, CapitalizeNestObjectKeys<foo>>>,
]
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/09775-hard-capitalize-nest-object-keys/template.ts | questions/09775-hard-capitalize-nest-object-keys/template.ts | type CapitalizeNestObjectKeys<T> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00010-medium-tuple-to-union/test-cases.ts | questions/00010-medium-tuple-to-union/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<TupleToUnion<[123, '456', true]>, 123 | '456' | true>>,
Expect<Equal<TupleToUnion<[123]>, 123>>,
]
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00010-medium-tuple-to-union/template.ts | questions/00010-medium-tuple-to-union/template.ts | type TupleToUnion<T> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00531-medium-string-to-union/test-cases.ts | questions/00531-medium-string-to-union/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<StringToUnion<''>, never>>,
Expect<Equal<StringToUnion<'t'>, 't'>>,
Expect<Equal<StringToUnion<'hello'>, 'h' | 'e' | 'l' | 'l' | 'o'>>,
Expect<Equal<StringToUnion<'coronavirus'>, 'c' | 'o' | 'r' | 'o' | 'n' | 'a' | 'v' | 'i... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00531-medium-string-to-union/template.ts | questions/00531-medium-string-to-union/template.ts | type StringToUnion<T extends string> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/02759-medium-requiredbykeys/test-cases.ts | questions/02759-medium-requiredbykeys/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
interface User {
name?: string
age?: number
address?: string
}
interface UserRequiredName {
name: string
age?: number
address?: string
}
interface UserRequiredNameAndAge {
name: string
age: number
address?: string
}
type cases = [
Expec... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/02759-medium-requiredbykeys/template.ts | questions/02759-medium-requiredbykeys/template.ts | type RequiredByKeys<T, K> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/32427-hard-unbox/test-cases.ts | questions/32427-hard-unbox/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
// Base cases
Expect<Equal<Unbox<number>, number>>,
Expect<Equal<Unbox<() => number>, number>>,
Expect<Equal<Unbox<() => number | string>, number | string>>,
Expect<Equal<Unbox<number[]>, number>>,
Expect<Equal<Unbox<(number | strin... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/32427-hard-unbox/template.ts | questions/32427-hard-unbox/template.ts | type Unbox<T> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00009-medium-deep-readonly/test-cases.ts | questions/00009-medium-deep-readonly/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<DeepReadonly<X1>, Expected1>>,
Expect<Equal<DeepReadonly<X2>, Expected2>>,
]
type X1 = {
a: () => 22
b: string
c: {
d: boolean
e: {
g: {
h: {
i: true
j: 'string'
}
... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00009-medium-deep-readonly/template.ts | questions/00009-medium-deep-readonly/template.ts | type DeepReadonly<T> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/07258-hard-object-key-paths/test-cases.ts | questions/07258-hard-object-key-paths/test-cases.ts | import type { Equal, Expect, ExpectExtends } from '@type-challenges/utils'
const ref = {
count: 1,
person: {
name: 'cattchen',
age: 22,
books: ['book1', 'book2'],
pets: [
{
type: 'cat',
},
],
},
}
type cases = [
Expect<Equal<ObjectKeyPaths<{ name: string, age: number }>... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/07258-hard-object-key-paths/template.ts | questions/07258-hard-object-key-paths/template.ts | type ObjectKeyPaths<T extends object> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00016-medium-pop/test-cases.ts | questions/00016-medium-pop/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<Pop<[3, 2, 1]>, [3, 2]>>,
Expect<Equal<Pop<['a', 'b', 'c', 'd']>, ['a', 'b', 'c']>>,
Expect<Equal<Pop<[]>, []>>,
]
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00016-medium-pop/template.ts | questions/00016-medium-pop/template.ts | type Pop<T extends any[]> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/03060-easy-unshift/test-cases.ts | questions/03060-easy-unshift/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<Unshift<[], 1>, [1]>>,
Expect<Equal<Unshift<[1, 2], 0>, [0, 1, 2]>>,
Expect<Equal<Unshift<['1', 2, '3'], boolean>, [boolean, '1', 2, '3']>>,
]
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/03060-easy-unshift/template.ts | questions/03060-easy-unshift/template.ts | type Unshift<T, U> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/17973-medium-deepmutable/test-cases.ts | questions/17973-medium-deepmutable/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
interface Test1 {
readonly title: string
readonly description: string
readonly completed: boolean
readonly meta: {
readonly author: string
}
}
type Test2 = {
readonly a: () => 1
readonly b: string
readonly c: {
readonly d: boolean
... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/17973-medium-deepmutable/template.ts | questions/17973-medium-deepmutable/template.ts | type DeepMutable = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/28333-medium-public-type/test-cases.ts | questions/28333-medium-public-type/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<PublicType<{ a: number }>, { a: number }>>,
Expect<Equal<PublicType<{ _b: string | bigint }>, {}>>,
Expect<Equal<PublicType<{ readonly c?: number }>, { readonly c?: number }>>,
Expect<Equal<PublicType<{ d: string, _e: strin... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/28333-medium-public-type/template.ts | questions/28333-medium-public-type/template.ts | type PublicType<T extends object> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/34007-medium-compare-array-length/test-cases.ts | questions/34007-medium-compare-array-length/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<CompareArrayLength<[1, 2, 3, 4], [5, 6]>, 1>>,
Expect<Equal<CompareArrayLength<[1, 2], [3, 4, 5, 6]>, -1>>,
Expect<Equal<CompareArrayLength<[], []>, 0>>,
Expect<Equal<CompareArrayLength<[1, 2, 3], [4, 5, 6]>, 0>>,
]
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/34007-medium-compare-array-length/template.ts | questions/34007-medium-compare-array-length/template.ts | type CompareArrayLength<T extends any[], U extends any[]> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/04499-medium-chunk/test-cases.ts | questions/04499-medium-chunk/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<Chunk<[], 1>, []>>,
Expect<Equal<Chunk<[1, 2, 3], 1>, [[1], [2], [3]]>>,
Expect<Equal<Chunk<[1, 2, 3], 2>, [[1, 2], [3]]>>,
Expect<Equal<Chunk<[1, 2, 3, 4], 2>, [[1, 2], [3, 4]]>>,
Expect<Equal<Chunk<[1, 2, 3, 4], 5>, [[1... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/04499-medium-chunk/template.ts | questions/04499-medium-chunk/template.ts | type Chunk = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/08987-medium-subsequence/test-cases.ts | questions/08987-medium-subsequence/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<Subsequence<[1, 2]>, [] | [1] | [2] | [1, 2]>>,
Expect<Equal<Subsequence<[1, 2, 3]>, [] | [1] | [2] | [1, 2] | [3] | [1, 3] | [2, 3] | [1, 2, 3]>>,
Expect<Equal<Subsequence<[1, 2, 3, 4, 5]>, [] |
[1] | [2] | [3] | [4] | [5]... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/08987-medium-subsequence/template.ts | questions/08987-medium-subsequence/template.ts | type Subsequence<T extends any[]> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/04425-medium-greater-than/test-cases.ts | questions/04425-medium-greater-than/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<GreaterThan<1, 0>, true>>,
Expect<Equal<GreaterThan<5, 4>, true>>,
Expect<Equal<GreaterThan<4, 5>, false>>,
Expect<Equal<GreaterThan<0, 0>, false>>,
Expect<Equal<GreaterThan<10, 9>, true>>,
Expect<Equal<GreaterThan<20, ... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/04425-medium-greater-than/template.ts | questions/04425-medium-greater-than/template.ts | type GreaterThan<T extends number, U extends number> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00090-hard-optional-keys/test-cases.ts | questions/00090-hard-optional-keys/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<OptionalKeys<{ a: number, b?: string }>, 'b'>>,
Expect<Equal<OptionalKeys<{ a: undefined, b?: undefined }>, 'b'>>,
Expect<Equal<OptionalKeys<{ a: undefined, b?: undefined, c?: string, d?: null }>, 'b' | 'c' | 'd'>>,
Expect<... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00090-hard-optional-keys/template.ts | questions/00090-hard-optional-keys/template.ts | type OptionalKeys<T> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00089-hard-required-keys/test-cases.ts | questions/00089-hard-required-keys/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<RequiredKeys<{ a: number, b?: string }>, 'a'>>,
Expect<Equal<RequiredKeys<{ a: undefined, b?: undefined }>, 'a'>>,
Expect<Equal<RequiredKeys<{ a: undefined, b?: undefined, c: string, d: null }>, 'a' | 'c' | 'd'>>,
Expect<Eq... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00089-hard-required-keys/template.ts | questions/00089-hard-required-keys/template.ts | type RequiredKeys<T> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/02688-medium-startswith/test-cases.ts | questions/02688-medium-startswith/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<StartsWith<'abc', 'ac'>, false>>,
Expect<Equal<StartsWith<'abc', 'ab'>, true>>,
Expect<Equal<StartsWith<'abc', 'abc'>, true>>,
Expect<Equal<StartsWith<'abc', 'abcd'>, false>>,
Expect<Equal<StartsWith<'abc', ''>, true>>,
... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/02688-medium-startswith/template.ts | questions/02688-medium-startswith/template.ts | type StartsWith<T extends string, U extends string> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/06228-extreme-json-parser/test-cases.ts | questions/06228-extreme-json-parser/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<(
Parse<`
{
"a": "b",
"b": false,
"c": [true, false, "hello", {
"a": "b",
"b": false
}],
"nil": null
}
`>
), (
{
nil: null
c: [... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/06228-extreme-json-parser/template.ts | questions/06228-extreme-json-parser/template.ts | type Pure<T> = {
[P in keyof T]: T[P] extends object ? Pure<T[P]> : T[P]
}
type SetProperty<T, K extends PropertyKey, V> = {
[P in (keyof T) | K]: P extends K ? V : P extends keyof T ? T[P] : never
}
type Token = any
type ParseResult<T, K extends Token[]> = [T, K]
type Tokenize<T extends string, S extends Token[]... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/01042-medium-isnever/test-cases.ts | questions/01042-medium-isnever/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<IsNever<never>, true>>,
Expect<Equal<IsNever<never | string>, false>>,
Expect<Equal<IsNever<''>, false>>,
Expect<Equal<IsNever<undefined>, false>>,
Expect<Equal<IsNever<null>, false>>,
Expect<Equal<IsNever<[]>, false>>,... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/01042-medium-isnever/template.ts | questions/01042-medium-isnever/template.ts | type IsNever<T> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00476-extreme-sum/test-cases.ts | questions/00476-extreme-sum/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<Sum<2, 3>, '5'>>,
Expect<Equal<Sum<'13', '21'>, '34'>>,
Expect<Equal<Sum<'328', 7>, '335'>>,
Expect<Equal<Sum<1_000_000_000_000n, '123'>, '1000000000123'>>,
Expect<Equal<Sum<9999, 1>, '10000'>>,
Expect<Equal<Sum<4325234... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00476-extreme-sum/template.ts | questions/00476-extreme-sum/template.ts | type Sum<A extends string | number | bigint, B extends string | number | bigint> = string
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/35991-medium-myuppercase/test-cases.ts | questions/35991-medium-myuppercase/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<MyUppercase<'a'>, 'A'>>,
Expect<Equal<MyUppercase<'Z'>, 'Z'>>,
Expect<Equal<MyUppercase<'A z h yy 😃cda\n\t a '>, 'A Z H YY 😃CDA\n\t A '>>,
]
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/35991-medium-myuppercase/template.ts | questions/35991-medium-myuppercase/template.ts | type MyUppercase<T extends string> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/27932-medium-mergeall/test-cases.ts | questions/27932-medium-mergeall/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<MergeAll<[]>, {} >>,
Expect<Equal<MergeAll<[{ a: 1 }]>, { a: 1 }>>,
Expect<Equal<
MergeAll<[{ a: string }, { a: string }]>,
{ a: string }
>
>,
Expect<Equal<
MergeAll<[{ }, { a: string }]>,
{ a: string }
>
... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/27932-medium-mergeall/template.ts | questions/27932-medium-mergeall/template.ts | type MergeAll<XS> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/03062-medium-shift/test-cases.ts | questions/03062-medium-shift/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
// @ts-expect-error
Shift<unknown>,
Expect<Equal<Shift<[]>, []>>,
Expect<Equal<Shift<[1]>, []>>,
Expect<Equal<Shift<[3, 2, 1]>, [2, 1]>>,
Expect<Equal<Shift<['a', 'b', 'c', 'd']>, ['b', 'c', 'd']>>,
]
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/03062-medium-shift/template.ts | questions/03062-medium-shift/template.ts | type Shift<T> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00003-medium-omit/test-cases.ts | questions/00003-medium-omit/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<Expected1, MyOmit<Todo, 'description'>>>,
Expect<Equal<Expected2, MyOmit<Todo, 'description' | 'completed'>>>,
Expect<Equal<Expected3, MyOmit<Todo1, 'description' | 'completed'>>>,
]
// @ts-expect-error
type error = MyOmit<T... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00003-medium-omit/template.ts | questions/00003-medium-omit/template.ts | type MyOmit<T, K> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00114-hard-camelcase/test-cases.ts | questions/00114-hard-camelcase/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<CamelCase<'foobar'>, 'foobar'>>,
Expect<Equal<CamelCase<'FOOBAR'>, 'foobar'>>,
Expect<Equal<CamelCase<'foo_bar'>, 'fooBar'>>,
Expect<Equal<CamelCase<'foo__bar'>, 'foo_Bar'>>,
Expect<Equal<CamelCase<'foo_$bar'>, 'foo_$bar'... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00114-hard-camelcase/template.ts | questions/00114-hard-camelcase/template.ts | type CamelCase<S extends string> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00399-hard-tuple-filter/test-cases.ts | questions/00399-hard-tuple-filter/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<FilterOut<[], never>, []>>,
Expect<Equal<FilterOut<[never], never>, []>>,
Expect<Equal<FilterOut<['a', never], never>, ['a']>>,
Expect<Equal<FilterOut<[1, never, 'a'], never>, [1, 'a']>>,
Expect<Equal<FilterOut<[never, 1,... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00399-hard-tuple-filter/template.ts | questions/00399-hard-tuple-filter/template.ts | type FilterOut<T extends any[], F> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00472-hard-tuple-to-enum-object/test-cases.ts | questions/00472-hard-tuple-to-enum-object/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
const OperatingSystem = ['macOS', 'Windows', 'Linux'] as const
const Command = ['echo', 'grep', 'sed', 'awk', 'cut', 'uniq', 'head', 'tail', 'xargs', 'shift'] as const
type cases = [
Expect<Equal<Enum<[]>, {}>>,
Expect<Equal<
Enum<typeof OperatingSyste... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00472-hard-tuple-to-enum-object/template.ts | questions/00472-hard-tuple-to-enum-object/template.ts | type Enum<T extends readonly string[], N extends boolean = false> = any
| typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
type-challenges/type-challenges | https://github.com/type-challenges/type-challenges/blob/00122042c4c58f12227e97c68235dfde1fd2129d/questions/00002-medium-return-type/test-cases.ts | questions/00002-medium-return-type/test-cases.ts | import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<string, MyReturnType<() => string>>>,
Expect<Equal<123, MyReturnType<() => 123>>>,
Expect<Equal<ComplexObject, MyReturnType<() => ComplexObject>>>,
Expect<Equal<Promise<boolean>, MyReturnType<() => Promise<boolean>>>>,
Ex... | typescript | MIT | 00122042c4c58f12227e97c68235dfde1fd2129d | 2026-01-04T15:39:52.431107Z | false |
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