{"id":16121701,"url":"https://github.com/g-plane/typecake","last_synced_at":"2025-03-17T19:31:15.137Z","repository":{"id":94214597,"uuid":"400468445","full_name":"g-plane/TypeCake","owner":"g-plane","description":"TypeCake is a language that compiles to TypeScript types. 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'a' : 'b';\n\ntype F2\u003cT\u003e = T extends string ? 'a' : T extends boolean ? 'b' : 'c';\n```\n\n### Switch expression (pattern matching)\n\n[Playground](https://typecake.vercel.app/?code=H4sIAAAAAAAAA2WNwQqCQBRF9_MVdzcKBmm7oDaBHxDuREJjTEnfhDODSPTvOepkEbzFe-c87i0JJ2lIe8kehu4ke0ozHweovtbXCgmeDEgzbI7YBnbNaZiu0F0BHIosutiNtyPjAXsxVhLi0Ev-MpXuarpNz7qqFcaZEbcphZSNyOlHL4yvLVJXooMeHuLTdRbKNDr0bN_YO0f6q4mcWdK-1M4pMm0hOp-9AeU_KoMdAQAA)\n\n```rust\nfn F1(T) = switch T {\n  string -\u003e 'a',\n  boolean -\u003e 'b',\n  _ -\u003e 'c',\n}\n\nfn F2(T: unknown[]) = switch T {\n  [] -\u003e unknown,\n  [\u0026First] -\u003e First,\n  [any, \u0026Second] -\u003e Second,\n  _ -\u003e never,\n}\n```\n\ncompiles to TypeScript:\n\n```ts\ntype F1\u003cT\u003e = T extends string ? 'a' : T extends boolean ? 'b' : 'c';\n\ntype F2\u003cT extends unknown[]\u003e = T extends [] ? unknown : T extends [infer First] ? First : T extends [any, infer Second] ? Second : never;\n```\n\n### For expression\n\n[Playground](https://typecake.vercel.app/?code=H4sIAAAAAAAAA0vLU3Az1NBUsFVIyy9S8FbIzFNQT87JTM5WV6gBsjIS89JT1RWquRQUEvLzdFWqvWsTuGq5uNKA2owIakssBulSqXZOLMgsSczJrErV8NasTQAb5w00BgC743aYfQAAAA)\n\n```rust\nfn F2() = for K in 'click' | 'change' as `on${Capitalize(K)}` {\n  K\n}\n```\n\ncompiles to TypeScript:\n\n```ts\ntype F2 = { [K in 'click' | 'change' as `on${Capitalize\u003cK\u003e}`]: K };\n```\n\n### Const-In expression\n\n[Playground](https://typecake.vercel.app/?code=H4sIAAAAAAAAA0vLU3DT0FSw5VJQSM7PKy5RCDFUsFUITi3RKC4pysxL19QBykBAiBFQxrGoKLFSI680Nym1SBMolZmnkJkG0mQFkq8GK44OMYwFMmoVUnOKU-FiRmAxLgBZkttDcQAAAA)\n\n```rust\nfn F(T) =\n  const T1 = MyType(1),\n        T2 = MyType(2)\n  in if T1 : T2 {\n    [T1]\n  } else {\n    [T2]\n  }\n```\n\ncompiles to TypeScript:\n\n```ts\ntype F\u003cT\u003e = MyType\u003c1\u003e extends infer T1 ? MyType\u003c2\u003e extends infer T2 ? T1 extends T2 ? [T1] : [T2] : never : never;\n```\n\n### Pipeline Expression\n\n[Playground](https://typecake.vercel.app/?code=H4sIAAAAAAAAA0vLU3DT0FSwVcgrzU1KLeJSUKixUwgoys_NLE6FcIJTSyCMoNTk_KIUjeKSosy8dE0uADxNif86AAAA)\n\n```fsharp\nfn F() = number\n  |\u003e Promise\n  |\u003e Set\n  |\u003e Record(string)\n```\n\ncompiles to TypeScript:\n\n```ts\ntype F = Record\u003cstring, Set\u003cPromise\u003cnumber\u003e\u003e\u003e;\n```\n\n### Macro\n\n\u003e Experimental. Not implemented yet.\n\n```rust\nfn F() = union!(string, number)\n```\n\n### Import declaration\n\n[Playground](https://typecake.vercel.app/?code=H4sIAAAAAAAAA0srys9VUE9UV8jMLcgvKlFI5EoDiyTBRbQUEosVkqDCyXDhaoUKHYVKkFyVQi1UNgUum6IDVJCro5AHlAMAxhXmOmMAAAA)\n\n```python\nfrom 'a' import a\nfrom 'b' import * as b\nfrom 'c' import { x, y as z }\nfrom 'd' import d, { m, n }\n```\n\ncompiles to TypeScript:\n\n```ts\nimport a from 'a';\nimport * as b from 'b';\nimport { x, y as z } from 'c';\nimport d, { m, n } from 'd';\n```\n\n## License\n\nMIT License\n\n2021-present (c) Pig Fang\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fg-plane%2Ftypecake","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fg-plane%2Ftypecake","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fg-plane%2Ftypecake/lists"}