Reorganization. Split remote/result/request. Split picsum specific api.

src/result.ts

@@ -0,0 +1,18 @@
+export type Result<A, E> = { tag: "ok"; value: A } | { tag: "error"; error: E }
+
+export const Result = {
+  ok<A>(value: A): Result<A, never> {
+    return { tag: "ok", value }
+  },
+  err<E>(error: E): Result<never, E> {
+    return { tag: "error", error }
+  },
+  map<A, B, E>(result: Result<A, E>, f: (x: A) => B): Result<B, E> {
+    switch (result.tag) {
+      case "ok":
+        return { tag: "ok", value: f(result.value) }
+      case "error":
+        return { tag: "error", error: result.error }
+    }
+  },
+}