feat: add @vant/use

packages/vant-use/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "@vant/use",
+  "version": "0.0.1-beta.0",
+  "description": "Vant composition api",
+  "main": "lib/index.js",
+  "module": "es/index.js",
+  "typings": "lib/index.d.ts",
+  "sideEffects": false,
+  "scripts": {
+    "dev": "tsc -m esNext --outDir es --watch",
+    "build": "tsc && tsc -m esNext --outDir es"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "license": "MIT",
+  "repository": "https://github.com/youzan/vant/tree/dev/packages/vant-use",
+  "devDependencies": {
+    "release-it": "^14.0.2",
+    "typescript": "^4.0.2",
+    "vue": "^3.0.0-rc.10"
+  }
+}

packages/vant-use/src/index.ts

@@ -0,0 +1 @@
+export { useToggle } from './useToggle';

packages/vant-use/src/useToggle/index.ts

@@ -0,0 +1,10 @@
+import { ref } from 'vue';
+
+export function useToggle(defaultValue = false) {
+  const state = ref(defaultValue);
+  const toggle = (value = !state.value) => {
+    state.value = value;
+  };
+
+  return [state, toggle];
+}

packages/vant-use/tsconfig.json

@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "target": "ES5",
+    "outDir": "./lib",
+    "module": "CommonJS",
+    "strict": true,
+    "declaration": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "moduleResolution": "Node",
+    "lib": ["esnext"]
+  },
+  "include": ["src/**/*"]
+}