astro lifting

apps/wing-console/console/app/demo/index.w

@@ -1,12 +1,17 @@
 bring ex;
 
-new ex.Astro(root: "../../astro");
+let astro = new ex.Astro(root: "../../astro");
 
 bring cloud;
 
 new cloud.Website(path: "");
 
 let bucket = new cloud.Bucket();
+
+astro.defineVirtualModule("test", {
+  "bucket" => bucket,
+});
+
 let queue = new cloud.Queue();
 let api = new cloud.Api();
 

apps/wing-console/console/astrotest.js

@@ -0,0 +1,7 @@
+export const bucket = (function(env) {
+  let handle = process.env[env];
+  if (!handle) {
+    throw new Error("Missing environment variable: " + env);
+  }
+  return $simulator.findInstance(handle);
+})("BUCKET_HANDLE_2cd0933d");

libs/wingsdk/src/ex/astro.ts

@@ -67,6 +67,12 @@ export abstract class Astro extends Resource {
     this._domain = props.domain;
   }
 
+  // TODO: how do we annotate that the map is <string, any preflight value>?
+  public abstract defineVirtualModule(
+    name: string,
+    values: Record<string, any>
+  ): void;
+
   /** @internal */
   public _getInflightOps(): string[] {
     return [];

libs/wingsdk/src/target-sim/astro.ts

@@ -6,12 +6,23 @@ import { bindSimulatorResource, makeSimulatorJsClient } from "./util";
 import * as ex from "../ex";
 import { IInflightHost } from "../std";
 import { BaseResourceSchema } from "../testing/simulator";
+import { liftObject } from "../core/internal";
+import { writeFileSync } from "fs";
 
 export class Astro extends ex.Astro implements ISimulatorResource {
   constructor(scope: Construct, id: string, props: ex.AstroProps) {
     super(scope, id, props);
   }
 
+  public defineVirtualModule(name: string, values: Record<string, any>): void {
+    const lines = [];
+    for (const value in values) {
+      lines.push(`export const ${value} = ${liftObject(this, values[value])};`);
+    }
+    const outfile = `${this.root}${name}.js`;
+    writeFileSync(outfile, lines.join("\n"));
+  }
+
   public get url(): string {
     return simulatorAttrToken(this, "url");
   }