[IMP] component: get env from constructor

closes #430

src/component/component.ts

@@ -1,7 +1,6 @@
 import { Observer } from "../core/observer";
 import { CompiledTemplate, QWeb } from "../qweb/index";
 import { h, patch, VNode } from "../vdom/index";
-import { config } from "../config";
 import "./directive";
 import { Fiber } from "./fiber";
 import "./props_validation";
@@ -88,6 +87,7 @@ export class Component<T extends Env, Props extends {}> {
   static components = {};
   static props?: any;
   static defaultProps?: any;
+  static env: any = {};
 
   /**
    * The `el` is the root element of the component.  Note that it could be null:
@@ -131,7 +131,10 @@ export class Component<T extends Env, Props extends {}> {
       depth = __powl__.depth + 1;
     } else {
       // we are the root component
-      this.env = config.env as T;
+      this.env = (this.constructor as any).env;
+      if (!this.env.qweb) {
+        this.env.qweb = new QWeb();
+      }
       this.props = undefined as unknown as Props;
       this.env.qweb.on("update", this, () => {
         if (this.__owl__.isMounted) {

src/config.ts

@@ -1,5 +1,4 @@
 import { QWeb } from "./qweb/index";
-import { Env } from "./component/component";
 
 /**
  * This file creates and exports the OWL 'config' object, with keys:
@@ -8,7 +7,6 @@ import { Env } from "./component/component";
  */
 
 interface Config {
-  env: Env;
   mode: string;
 }
 
@@ -30,19 +28,3 @@ Object.defineProperty(config, "mode", {
     }
   },
 });
-
-let env:Env;
-Object.defineProperty(config, "env", {
-  get() {
-    if (!env) {
-      env = {} as Env;
-    }
-    if (!env.qweb) {
-      env.qweb = new QWeb();
-    }
-    return env;
-  },
-  set(newEnv: Env) {
-    env = newEnv;
-  },
-});