Add @rescript/core as a pre-vendored playground dependency

Author: ryyppy

packages/playground-bundling/bsconfig.json

@@ -1,7 +1,7 @@
 {
   "name": "playground",
   "version": "0.1.0",
-  "bs-dependencies": ["@rescript/react"],
+  "bs-dependencies": ["@rescript/react", "@rescript/core"],
   "package-specs": {
     "module": "es6",
     "in-source": false

packages/playground-bundling/package-lock.json

@@ -11,6 +11,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
+    "@rescript/core": "^0.3.0",
     "@rescript/react": "^0.11.0"
   }
 }

packages/playground-bundling/package.json

@@ -1,15 +1,19 @@
 require("./compiler.js")
 require("./packages/compilerCmij.js")
 require("./packages/@rescript/react/cmij.js")
+require("./packages/@rescript/core/cmij.js")
 
 let compiler = rescript_compiler.make()
 
 let result = compiler.rescript.compile(`
   @@jsxConfig({ version: 4, mode: "automatic" })
 
+  open RescriptCore
+
   module A = {
     @react.component
     let make = (~a) => {
+      let state = React.useState(() => 0)
       <div> {React.string(a)} </div>
     }
   }
@@ -22,6 +26,12 @@ let result = compiler.rescript.compile(`
     }
   }
 
+  let sum = [1,2,3] 
+    ->Array.map(x => x * 2)
+    ->Array.reduce(0, (acc, item) => acc + item)
+
+  Console.log("Hello world!")
+
   let a = <B a="hello" />
 `);