5 files changed, 39 insertions, 4 deletions
diff --git a/js/deno.ts b/js/deno.ts
index 490494cc6..66d7d796c 100644
--- a/js/deno.ts
+++ b/js/deno.ts
@@ -58,6 +58,7 @@ export { metrics, Metrics } from "./metrics";
 export { resources } from "./resources";
 export { run, RunOptions, Process, ProcessStatus } from "./process";
 export { inspect } from "./console";
+export { version } from "./version";
 export const args: string[] = [];
 
 // TODO Don't expose Console nor stringifyArgs.
diff --git a/js/main.ts b/js/main.ts
index 1116a1165..a5aae51a1 100644
--- a/js/main.ts
+++ b/js/main.ts
@@ -9,6 +9,7 @@ import * as os from "./os";
 import { libdeno } from "./libdeno";
 import { args } from "./deno";
 import { replLoop } from "./repl";
+import { setVersions } from "./version";
 
 // builtin modules
 import * as deno from "./deno";
@@ -24,12 +25,13 @@ export default function denoMain() {
   libdeno.builtinModules["deno"] = deno;
   Object.freeze(libdeno.builtinModules);
 
+  setVersions(startResMsg.denoVersion()!, startResMsg.v8Version()!);
+
   // handle `--version`
   if (startResMsg.versionFlag()) {
-    console.log("deno:", startResMsg.denoVersion());
-    console.log("v8:", startResMsg.v8Version());
-    // TODO figure out a way to restore functionality
-    // console.log("typescript:", version);
+    console.log("deno:", deno.version.deno);
+    console.log("v8:", deno.version.v8);
+    console.log("typescript:", deno.version.typescript);
     os.exit(0);
   }
 
diff --git a/js/unit_tests.ts b/js/unit_tests.ts
index a5fc836c5..c8479145b 100644
--- a/js/unit_tests.ts
+++ b/js/unit_tests.ts
@@ -44,6 +44,7 @@ import "./url_test.ts";
 import "./url_search_params_test.ts";
 import "./write_file_test.ts";
 import "./performance_test.ts";
+import "./version_test.ts";
 
 import "../website/app_test.js";
 
diff --git a/js/version.ts b/js/version.ts
new file mode 100644
index 000000000..805e565a0
--- /dev/null
+++ b/js/version.ts
@@ -0,0 +1,23 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+interface Version {
+  deno: string;
+  v8: string;
+  typescript: string;
+}
+
+export const version: Version = {
+  deno: "",
+  v8: "",
+  typescript: "TS_VERSION" // This string will be replaced by rollup
+};
+
+/**
+ * Sets the deno and v8 versions and freezes the version object.
+ * @internal
+ */
+export function setVersions(denoVersion: string, v8Version: string): void {
+  version.deno = denoVersion;
+  version.v8 = v8Version;
+
+  Object.freeze(version);
+}
diff --git a/js/version_test.ts b/js/version_test.ts
new file mode 100644
index 000000000..d3d1bc3df
--- /dev/null
+++ b/js/version_test.ts
@@ -0,0 +1,8 @@
+import { test, assert } from "./test_util.ts";
+
+test(function version() {
+  const pattern = /^\d+\.\d+\.\d+$/;
+  assert(pattern.test(Deno.version.deno));
+  assert(pattern.test(Deno.version.v8));
+  assert(pattern.test(Deno.version.typescript));
+});