Add: Success / Error object utils

src/lib/util.server.js

@@ -0,0 +1,58 @@
+import { fail } from "@sveltejs/kit";
+
+/**
+ * @param {import("$types/status").Error} error 
+ * @returns {import("@sveltejs/kit").ActionFailure<import("$types/status").Error>}
+ */
+export function errorToFail(error) {
+  if (error.expected) {
+    return fail(400, error);
+  }
+  return fail(500, error);
+}
+
+/**
+ * @param {any} result 
+ * @returns {import("$types/status").Error | null}
+ */
+export function getError(result) {
+  if ('error' in result) {
+    return result;
+  }
+  return null;
+}
+
+/**
+ * @param {any} result 
+ * @returns {import("$types/status").Success | null}
+ */
+export function getSuccess(result) {
+  if ('success' in result) {
+    return result;
+  }
+  return null;
+}
+
+/**
+ * @template T
+ * @param {any} result 
+ * @param {function(import("$types/status").Error): T} callback 
+ * @returns {T | undefined}
+ */
+export function runIfError(result, callback) {
+  if ('error' in result) {
+    return callback(result);
+  }
+}
+
+/**
+ * @template T
+ * @param {any} result 
+ * @param {function(import("$types/status").Success): T} callback 
+ * @returns {T | undefined}
+ */
+export function runIfSuccess(result, callback) {
+  if ('success' in result) {
+    return callback(result);
+  }
+}