1 files changed, 51 insertions, 0 deletions
diff --git a/packages/webapi/src/lib/Storage.ts b/packages/webapi/src/lib/Storage.ts
new file mode 100644
index 000000000..672c537c8
--- /dev/null
+++ b/packages/webapi/src/lib/Storage.ts
@@ -0,0 +1,51 @@
+import * as _ from './utils'
+
+export class Storage {
+	clear(): void {
+		_.internalsOf<StorageInternals>(this, 'Storage', 'clear').storage.clear()
+	}
+
+	getItem(key: string): string | null {
+		return getStringOrNull(
+			_.internalsOf<StorageInternals>(this, 'Storage', 'getItem').storage.get(String(key))
+		)
+	}
+
+	key(index: number): string | null {
+		return getStringOrNull([ ..._.internalsOf<StorageInternals>(this, 'Storage', 'key').storage.keys() ][Number(index) || 0])
+	}
+
+	removeItem(key: string): void {
+		_.internalsOf<StorageInternals>(this, 'Storage', 'getItem').storage.delete(String(key))
+	}
+
+	setItem(key: string, value: any): void {
+		_.internalsOf<StorageInternals>(this, 'Storage', 'getItem').storage.set(String(key), String(value))
+	}
+
+	get length() {
+		return _.internalsOf<StorageInternals>(this, 'Storage', 'size').storage.size
+	}
+}
+
+const getStringOrNull = (value: string | void) => typeof value === 'string' ? value : null
+
+export const initStorage = (target: Target, exclude: Set<string>) => {
+	if (exclude.has('Storage') || exclude.has('localStorage')) return
+
+	target.localStorage = Object.create(Storage.prototype)
+
+	const storageInternals = new Map<string, string>()
+
+	_.INTERNALS.set(target.localStorage, {
+		storage: storageInternals
+	} as StorageInternals)
+}
+
+interface StorageInternals {
+	storage: Map<string, string>
+}
+
+interface Target {
+	localStorage: Storage
+}