3 files changed, 119 insertions, 0 deletions
diff --git a/app_expo/utils/storage/index.ts b/app_expo/utils/storage/index.ts
new file mode 100644
index 0000000..69b61ec
--- /dev/null
+++ b/app_expo/utils/storage/index.ts
@@ -0,0 +1 @@
+export * from './storage'
diff --git a/app_expo/utils/storage/storage.test.ts b/app_expo/utils/storage/storage.test.ts
new file mode 100644
index 0000000..bb241c0
--- /dev/null
+++ b/app_expo/utils/storage/storage.test.ts
@@ -0,0 +1,39 @@
+import AsyncStorage from '@react-native-async-storage/async-storage'
+import { load, loadString, save, saveString, clear, remove } from './storage'
+
+// fixtures
+const VALUE_OBJECT = { x: 1 }
+const VALUE_STRING = JSON.stringify(VALUE_OBJECT)
+
+beforeEach(() => (AsyncStorage.getItem as jest.Mock).mockReturnValue(Promise.resolve(VALUE_STRING)))
+afterEach(() => jest.clearAllMocks())
+
+test('load', async () => {
+  const value = await load('something')
+  expect(value).toEqual(JSON.parse(VALUE_STRING))
+})
+
+test('loadString', async () => {
+  const value = await loadString('something')
+  expect(value).toEqual(VALUE_STRING)
+})
+
+test('save', async () => {
+  await save('something', VALUE_OBJECT)
+  expect(AsyncStorage.setItem).toHaveBeenCalledWith('something', VALUE_STRING)
+})
+
+test('saveString', async () => {
+  await saveString('something', VALUE_STRING)
+  expect(AsyncStorage.setItem).toHaveBeenCalledWith('something', VALUE_STRING)
+})
+
+test('remove', async () => {
+  await remove('something')
+  expect(AsyncStorage.removeItem).toHaveBeenCalledWith('something')
+})
+
+test('clear', async () => {
+  await clear()
+  expect(AsyncStorage.clear).toHaveBeenCalledWith()
+})
diff --git a/app_expo/utils/storage/storage.ts b/app_expo/utils/storage/storage.ts
new file mode 100644
index 0000000..659e738
--- /dev/null
+++ b/app_expo/utils/storage/storage.ts
@@ -0,0 +1,79 @@
+import AsyncStorage from '@react-native-async-storage/async-storage'
+
+/**
+ * Loads a string from storage.
+ *
+ * @param key The key to fetch.
+ */
+export async function loadString(key: string): Promise<string | null> {
+  try {
+    return await AsyncStorage.getItem(key)
+  } catch {
+    // not sure why this would fail... even reading the RN docs I'm unclear
+    return null
+  }
+}
+
+/**
+ * Saves a string to storage.
+ *
+ * @param key The key to fetch.
+ * @param value The value to store.
+ */
+export async function saveString(key: string, value: string): Promise<boolean> {
+  try {
+    await AsyncStorage.setItem(key, value)
+    return true
+  } catch {
+    return false
+  }
+}
+
+/**
+ * Loads something from storage and runs it thru JSON.parse.
+ *
+ * @param key The key to fetch.
+ */
+export async function load(key: string): Promise<any | null> {
+  try {
+    const almostThere = await AsyncStorage.getItem(key)
+    return JSON.parse(almostThere)
+  } catch {
+    return null
+  }
+}
+
+/**
+ * Saves an object to storage.
+ *
+ * @param key The key to fetch.
+ * @param value The value to store.
+ */
+export async function save(key: string, value: any): Promise<boolean> {
+  try {
+    await AsyncStorage.setItem(key, JSON.stringify(value))
+    return true
+  } catch {
+    return false
+  }
+}
+
+/**
+ * Removes something from storage.
+ *
+ * @param key The key to kill.
+ */
+export async function remove(key: string): Promise<void> {
+  try {
+    await AsyncStorage.removeItem(key)
+  } catch {}
+}
+
+/**
+ * Burn it all to the ground.
+ */
+export async function clear(): Promise<void> {
+  try {
+    await AsyncStorage.clear()
+  } catch {}
+}