Function fn

fn<R, C = never>(thunk: Thunk<R>): Effect<R, C, never, never>
Creates a lazy Effect from a thunk function.
Type Parameters
- R
  The success value type produced by the thunk
- C = never
  The error type that may be thrown by the thunk (defaults to never)
Parameters
- thunk: Thunk<R>
  A function receiving an AbortSignal that returns R or Promise<R>
Returns Effect<R, C, never, never>
A lazy Effect that, when run, invokes the thunk
Remarks
The thunk receives an AbortSignal that is triggered when the effect is cancelled. The thunk may return a value synchronously or a Promise for asynchronous work. The effect is not executed until it is passed to run.
Example
```
import { fn, run } from "mini-effect";

const delay = fn(
  (signal) =>
    new Promise<void>((resolve, reject) => {
      const id = setTimeout(resolve, 1000);
      signal.addEventListener("abort", () => {
        clearTimeout(id);
        reject(signal.reason);
      });
    }),
);

await run(delay);
```
- Defined in src/mini-effect.ts:109