feat: plugin config

update: package.json

src/index.ts

@@ -1,4 +1,5 @@
 import RevueFlow from './container/RevueFlow';
+import { App, inject, InjectionKey } from 'vue-demi';
 
 export default RevueFlow;
 
@@ -25,3 +26,32 @@ export { default as useUpdateNodeInternals } from './hooks/useUpdateNodeInternal
 
 export * from './additional-components';
 export * from './types';
+
+export interface RevueFlowOptions {
+  theme: string;
+}
+
+export interface RevueFlowPlugin {
+  options?: RevueFlowOptions;
+
+  install(app: App): void;
+}
+
+export const RevueFlowPluginSymbol: InjectionKey<RevueFlowPlugin> = Symbol();
+
+export function RevueFlowPlugin(): RevueFlowPlugin {
+  const RevueFlowPlugin = inject(RevueFlowPluginSymbol);
+  if (!RevueFlowPlugin) throw new Error('No RevueFlowPlugin provided.');
+
+  return RevueFlowPlugin;
+}
+
+export function createVueCounterPlugin(options?: RevueFlowOptions): RevueFlowPlugin {
+  return {
+    options,
+    install(app: App) {
+      app.component('revue-flow', RevueFlow);
+      app.provide(RevueFlowPluginSymbol, this);
+    }
+  };
+}