norswap

I'm dropping a little library called "okayfail" implementing a Result<Value, Error> type for TypeScript. (Like the Rust Result type, or the NeverThrow TypeScript library.)

My favorite feature is the ability to do checked/typed exceptions via generators:

declare const numberResult: Result<number, Error>
      declare function fNumberResult(): Result<number, string>
      declare const shouldSum: boolean
      
      const foo: () => Result<number, Error | string> =
         fresult(function *() {
             const v1 = yield* numberResult
             // v1 is type `number`
             // if the result fails, foo returns it immediately
             const v2 = yield* fNumberResult()
             // same            
             return shouldSum ? v1 + v2 : okay(v1 - v2)
             // can return either values or results,
             // or a mix (the value types must match!)
         })

Check out the code & docs here.