refactor: split module into multiple files

Author: lambdalisue

.github/FUNDING.yml

@@ -1,6 +1,8 @@
 # These are supported funding model platforms
 
-github: [lambdalisue] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+github: [
+  lambdalisue,
+] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
 patreon: # Replace with a single Patreon username
 open_collective: # Replace with a single Open Collective username
 ko_fi: # Replace with a single Ko-fi username

README.md

@@ -21,7 +21,7 @@ inference and type checking of the operator functions.
 Pipe a value through a series of operator functions.
 
 ```ts
-import { pipe } from "@core/pipe";
+import { pipe } from "@core/pipe/pipe";
 
 const result = pipe(
   1,
@@ -36,7 +36,7 @@ Or use `async` module to pipe a value through a series of asynchronous operator
 functions.
 
 ```ts
-import { pipe } from "@core/pipe/async";
+import { pipe } from "@core/pipe/async/pipe";
 
 const result = pipe(
   1,

_common.ts

@@ -0,0 +1,8 @@
+import type { Operator } from "./operator.ts";
+
+/**
+ * @internal
+ */
+export type LastOperatorReturn<T extends Operator<unknown, unknown>[]> =
+  T extends [...Operator<unknown, unknown>[], Operator<unknown, infer R>] ? R
+    : never;

async/_common.ts

@@ -0,0 +1,10 @@
+import type { AsyncOperator } from "./operator.ts";
+
+/**
+ * @internal
+ */
+export type LastAsyncOperatorReturn<
+  T extends AsyncOperator<unknown, unknown>[],
+> = T extends
+  [...AsyncOperator<unknown, unknown>[], AsyncOperator<unknown, infer R>] ? R
+  : never;