typings for defaultless settings (#512)

* typings for defaultless settings

* fix other silly typings

* type guard utils

---------

Co-authored-by: Ven <vendicated@riseup.net>

2 files changed, 29 insertions, 1 deletions

diff --git a/src/utils/guards.ts b/src/utils/guards.ts
new file mode 100644
index 0000000..499f4b8
--- /dev/null
+++ b/src/utils/guards.ts
@@ -0,0 +1,25 @@
+/*
+ * Vencord, a modification for Discord's desktop app
+ * Copyright (c) 2023 Vendicated and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+export function isTruthy<T>(item: T): item is Exclude<T, 0 | "" | false | null | undefined> {
+    return Boolean(item);
+}
+
+export function isNonNullish<T>(item: T): item is Exclude<T, null | undefined> {
+    return item != null;
+}
diff --git a/src/utils/types.ts b/src/utils/types.ts
index 5ab6857..24915a6 100644
--- a/src/utils/types.ts
+++ b/src/utils/types.ts
@@ -229,9 +229,12 @@ type PluginSettingType<O extends PluginSettingDef> = O extends PluginSettingStri
     O extends PluginSettingSliderDef ? number :
     O extends PluginSettingComponentDef ? any :
     never;
+type PluginSettingDefaultType<O extends PluginSettingDef> = O extends PluginSettingSelectDef ? (
+    O["options"] extends { default?: boolean; }[] ? O["options"][number]["value"] : undefined
+) : O extends { default: infer T; } ? T : undefined;
 
 type SettingsStore<D extends SettingsDefinition> = {
-    [K in keyof D]: PluginSettingType<D[K]>;
+    [K in keyof D]: PluginSettingType<D[K]> | PluginSettingDefaultType<D[K]>;
 };
 
 /** An instance of defined plugin settings */