Function when

packages/effect/src/internal/matcher.ts:263–281

(
  pattern: P,
  f: Fn
)

/** @internal */
export const when = <
  R,
  const P extends Types.PatternPrimitive<R> | Types.PatternBase<R>,
  Ret,
  Fn extends (_: Types.WhenMatch<R, P>) => Ret
>(
  pattern: P,
  f: Fn
) =>
<I, F, A, Pr>(
  self: Matcher<I, F, R, A, Pr, Ret>
): Matcher<
  I,
  Types.AddWithout<F, Types.PForExclude<P>>,
  Types.ApplyFilters<I, Types.AddWithout<F, Types.PForExclude<P>>>,
  A | ReturnType<Fn>,
  Pr,
  Ret
> => (self as any).add(makeWhen(makePredicate(pattern), f as any))

/** @internal */
export const whenOr = <