Use nanostores for saving instances

package.json

@@ -25,7 +25,9 @@
 		"@astrojs/netlify": "^2.2.0",
 		"@astrojs/node": "^5.1.0",
 		"@astrojs/vercel": "^3.2.1",
-		"astro": "^2.1.7"
+		"@nanostores/persistent": "^0.7.0",
+		"astro": "^2.1.7",
+		"nanostores": "^0.7.4"
 	},
 	"devDependencies": {
 		"@types/node": "^18.15.10",

pnpm-lock.yaml

@@ -5,6 +5,7 @@ specifiers:
   '@astrojs/netlify': ^2.2.0
   '@astrojs/node': ^5.1.0
   '@astrojs/vercel': ^3.2.1
+  '@nanostores/persistent': ^0.7.0
   '@types/node': ^18.15.10
   '@typescript-eslint/eslint-plugin': ^5.57.0
   '@typescript-eslint/parser': ^5.57.0
@@ -15,6 +16,7 @@ specifiers:
   eslint-config-prettier: ^8.8.0
   eslint-plugin-astro: ^0.26.1
   eslint-plugin-unicorn: ^46.0.0
+  nanostores: ^0.7.4
   postcss: ^8.4.21
   postcss-csso: ^6.0.1
   prettier: ^2.8.7
@@ -31,7 +33,9 @@ dependencies:
   '@astrojs/netlify': 2.2.0_astro@2.1.7
   '@astrojs/node': 5.1.0_astro@2.1.7
   '@astrojs/vercel': 3.2.1_astro@2.1.7
+  '@nanostores/persistent': 0.7.0_nanostores@0.7.4
   astro: 2.1.7_zfwagalafqqey6uoinf67yy4wu
+  nanostores: 0.7.4
 
 devDependencies:
   '@types/node': 18.15.10
@@ -803,6 +807,15 @@ packages:
       - supports-color
     dev: false
 
+  /@nanostores/persistent/0.7.0_nanostores@0.7.4:
+    resolution: {integrity: sha512-4PAInL/T1hbftZUJ0cmgdFHBMalUoq7BUXFBy7QfyMv/8X3LPTYNh/yxspL7+J+XM3UNvVI7IFRMMs6FBasjhQ==}
+    engines: {node: ^14.0.0 || ^16.0.0 || >=18.0.0}
+    peerDependencies:
+      nanostores: ^0.7.0
+    dependencies:
+      nanostores: 0.7.4
+    dev: false
+
   /@netlify/functions/1.4.0:
     resolution: {integrity: sha512-gy7ULTIRroc2/jyFVGx1djCmmBMVisIwrvkqggq5B6iDcInRSy2Tpkm+V5C63hKJVkNRskKWtLQKm9ecCaQTjA==}
     engines: {node: '>=8.3.0'}
@@ -3668,6 +3681,11 @@ packages:
     engines: {node: ^10 || ^12 || ^13.7 || ^14 || >=15.0.1}
     hasBin: true
 
+  /nanostores/0.7.4:
+    resolution: {integrity: sha512-MBeUVt7NBcXqh7AGT+KSr3O0X/995CZsvcP2QEMP+PXFwb07qv3Vjyq+EX0yS8f12Vv3Tn2g/BvK/OZoMhJlOQ==}
+    engines: {node: ^14.0.0 || ^16.0.0 || >=18.0.0}
+    dev: false
+
   /napi-build-utils/1.0.2:
     resolution: {integrity: sha512-ONmRUqK7zj7DWX0D9ADe03wbwOBZxNAfF20PlGfCWQcD3+/MakShIHrMqx9YwPTfxDdF1zLeL+RGZiR9kGMLdg==}
 

src/components/instance-select.astro

@@ -66,9 +66,10 @@ const { prefilledInstance } = Astro.props;
 
 <script>
 	import { extractHost, normalizeURL } from "@scripts/util";
-
-	const LOCAL_STORAGE_KEY = "recentInstances";
-	const RECENT_INSTANCES_SIZE = 5;
+	import {
+		savedInstances as instanceStore,
+		saveInstance,
+	} from "@stores/saved-instances.ts";
 
 	const $form = document.querySelector("#js-s2f-form") as HTMLFormElement;
 	const $instanceContainer = document.querySelector(
@@ -76,22 +77,13 @@ const { prefilledInstance } = Astro.props;
 	) as HTMLLabelElement;
 	const $instance = document.querySelector("#instance") as HTMLInputElement;
 
-	const getSavedInstances = (): Array<string> => {
-		const storageValue = window.localStorage.getItem(LOCAL_STORAGE_KEY);
-		if (!storageValue) {
-			return [];
-		}
+	const savedInstances: Set<string> = instanceStore.get();
 
-		return JSON.parse(storageValue);
-	};
-
-	const savedInstances = getSavedInstances();
-
-	if (savedInstances.length > 0) {
+	if (savedInstances.size > 0) {
 		$instanceContainer.append(
 			"Previously used: ",
-			...savedInstances
-				.flatMap((instance, index) => {
+			...[...savedInstances]
+				.flatMap((instance: string, index: number) => {
 					if (!instance) {
 						return [];
 					}
@@ -117,17 +109,8 @@ const { prefilledInstance } = Astro.props;
 
 		if (formData.get("remember")) {
 			const instance = normalizeURL(formData.get("instance") as string);
-			const index = savedInstances.indexOf(instance);
-			if (index >= 0) {
-				savedInstances.splice(index, 1);
-			}
-			savedInstances.unshift(instance);
-			savedInstances.length = RECENT_INSTANCES_SIZE;
 
-			window.localStorage.setItem(
-				LOCAL_STORAGE_KEY,
-				JSON.stringify(savedInstances),
-			);
+			saveInstance(instance);
 		}
 
 		return true;

src/stores/saved-instances.ts

@@ -0,0 +1,21 @@
+import { persistentAtom } from "@nanostores/persistent";
+
+const LOCAL_STORAGE_KEY = "recentInstances";
+const RECENT_INSTANCES_SIZE = 5;
+
+export const savedInstances = persistentAtom<Set<string>>(
+	LOCAL_STORAGE_KEY,
+	new Set(),
+	{
+		encode: (set) => JSON.stringify([...set]),
+		decode: (value) => new Set(JSON.parse(value)),
+	},
+);
+
+export const saveInstance = (instance: string) => {
+	savedInstances.set(
+		new Set(
+			[instance, ...savedInstances.get()].slice(0, RECENT_INSTANCES_SIZE),
+		),
+	);
+};

svelte.config.js

@@ -0,0 +1,5 @@
+import { vitePreprocess } from "@astrojs/svelte";
+
+export default {
+	preprocess: vitePreprocess(),
+};

tsconfig.json

@@ -8,6 +8,7 @@
 			"@layouts/*": ["src/layouts/*"],
 			"@pages/*": ["src/pages/*"],
 			"@scripts/*": ["src/scripts/*"],
+			"@stores/*": ["src/stores/*"],
 			"@styles/*": ["src/styles/*"]
 		}
 	}