feat: localStorage in Taro

src/bom/index.ts

@@ -1,4 +1,5 @@
 export * from './fetch'
 export * from './navigator'
 export * from './performance'
+export * from './storage'
 export * from './raf'

src/bom/storage.ts

@@ -0,0 +1,63 @@
+import Taro from '@tarojs/taro'
+
+export class TaroStorage implements Storage {
+    /**
+     * Returns the number of key/value pairs currently present in the list associated with the object.
+     */
+    get length(): number {
+        const { keys } = Taro.getStorageInfoSync()
+        return keys.length
+    }
+
+    /**
+     * Empties the list associated with the object of all key/value pairs, if there are any.
+     */
+    clear(): void {
+        Taro.clearStorageSync()
+    }
+
+    /**
+     * Returns the current value associated with the given key, or null if the given key does not exist in the list associated with the object.
+     */
+    getItem(keyName: string): string | null {
+        const { keys } = Taro.getStorageInfoSync()
+        if (!keys.includes(keyName)) return null
+
+        const value = Taro.getStorageSync(keyName)
+        if (typeof value === 'string') return value
+        return JSON.stringify(value)
+    }
+
+    /**
+     * Returns the name of the nth key in the list, or null if n is greater than or equal to the number of key/value pairs in the object.
+     */
+    key(index: number): string | null {
+        const { keys } = Taro.getStorageInfoSync()
+        if (index >= keys.length || index < 0) return null
+        return keys[index]
+    }
+
+    /**
+     * Removes the key/value pair with the given key from the list associated with the object, if a key/value pair with the given key exists.
+     */
+    removeItem(keyName: string): void {
+        Taro.removeStorageSync(keyName)
+    }
+
+    /**
+     * Sets the value of the pair identified by key to value, creating a new key/value pair if none existed for key previously.
+     *
+     * Throws a "QuotaExceededError" DOMException exception if the new value couldn't be set. (Setting could fail if, e.g., the user has disabled storage for the site, or if the quota has been exceeded.)
+     */
+    setItem(keyName: string, keyValue: any): void {
+        try {
+            const value = String(keyValue)
+            Taro.setStorageSync(keyName, value)
+        } catch (e) {
+            // should throw a "QuotaExceededError" DOMException
+            throw e
+        }
+    }
+}
+
+export const localStorage = new Storage()

src/plugins/TaroProvidePlugin.ts

@@ -19,6 +19,9 @@ const cancelAnimationFrame = [`${prefix}/bom/raf`, 'caf']
 
 const Intl = ['intl']
 
+const Storage = [`${prefix}/bom/storage`, 'TaroStorage']
+const localStorage = [`${prefix}/bom/storage`, 'localStorage']
+
 let taroRuntimeVersion = '0.0.0'
 try {
     const { version } = require(path.join(
@@ -45,7 +48,12 @@ export class TaroProvidePlugin extends ProvidePlugin {
     }
 
     static buildDefinitions(identifiers = ['default'] as TaroProvidePluginIdentifiers[]): Record<string, string[]> {
-        const defaultIdentifiers: TaroProvidePluginIdentifiers[] = ['fetch', 'performanceNow', 'requestAnimationFrame']
+        const defaultIdentifiers: TaroProvidePluginIdentifiers[] = [
+            'fetch',
+            'performanceNow',
+            'requestAnimationFrame',
+            'Storage',
+        ]
 
         // if (semver.lt(taroRuntimeVersion, '3.0.0-rc.1')) defaultIdentifiers.push('requestAnimationFrame')
         if (semver.lt(taroRuntimeVersion, '3.0.0-alpha.6')) defaultIdentifiers.push('navigator')
@@ -99,5 +107,14 @@ export class TaroProvidePlugin extends ProvidePlugin {
                 ['window.Intl']: Intl,
             }
         },
+
+        get Storage() {
+            return {
+                Storage,
+                localStorage,
+                ['window.Storage']: Storage,
+                ['window.localStorage']: localStorage,
+            }
+        },
     }
 }