add wrapper scope van

package.json

@@ -50,4 +50,4 @@
     "email": "[email protected]"
   },
   "homepage": "https://vanjs.org/minivan"
-}
+}

src/shared.d.ts

@@ -13,4 +13,10 @@ export interface VanObj {
     readonly add: Function;
     readonly tags: Record<string, Function> & ((namespaceURI: string) => Record<string, Function>);
 }
-export {};
+
+export declare function getVan(): VanObj
+export declare function vanWrap<T>(van: VanObj, cb: (van: VanObj) => T): T
+export declare function vanWrapper<CB extends (...opts: any[]) => any>(cb: CB): CB
+
+type removeFromGlobal = () => void
+export declare function useGlobalVan(cb: VanObj): removeFromGlobal

src/shared.js

@@ -1 +1,30 @@
-export {};
+const ctx = [];
+
+export function getVan() {
+  const van = ctx[ctx.length - 1];
+  if (van) {
+    return van;
+  }
+  throw new Error('getVan() must be called in a wrapper function')
+}
+
+export function vanWrap(van, cb) {
+  ctx.push(van);
+  try {
+    const ret = cb(van);
+    return ret;
+  } finally {
+    ctx.pop();
+  }
+}
+
+
+export function vanWrapper(cb) {
+  const van = getVan();
+  return (...opt) => vanWrap(van, () => cb(...opt));
+}
+
+export function useGlobalVan(van) {
+  ctx.push(van);
+  return () => ctx.splice(ctx.indexOf(van), 1);
+}

src/shared.ts

@@ -23,3 +23,10 @@ export interface VanObj {
   readonly add: Function
   readonly tags: Record<string, Function> & ((namespaceURI: string) => Record<string, Function>)
 }
+
+export declare function getVan(): VanObj
+export declare function vanWrap<T>(van: VanObj, cb: (van: VanObj) => T): T
+export declare function vanWrapper<CB extends (...opts: any[]) => any>(cb: CB): CB
+
+type removeFromGlobal = () => void
+export declare function useGlobalVan(cb: VanObj): removeFromGlobal