import {
  EventStream,
  EventStreamSeed,
  ObservableSeed,
  Property,
  PropertySeed,
} from "./abstractions"
import { tap } from "./tap"

export type LogResult<O> = O extends Property<infer A>
  ? Property<A>
  : O extends PropertySeed<infer A>
  ? PropertySeed<A>
  : O extends EventStream<infer A>
  ? EventStream<A>
  : O extends EventStreamSeed<infer A>
  ? EventStreamSeed<A>
  : never

export interface LogOp {
  <O extends ObservableSeed<any, any, any>>(o: O): LogResult<O>
}
export function log(...prefixes: any[]): LogOp {
  return tap((x: any) => console.log(...prefixes, x)) as LogOp
}