Add missing node os.release() implementation (#4065)

5 files changed, 42 insertions, 1 deletions

diff --git a/cli/js/deno.ts b/cli/js/deno.ts
index c1b074f3d..887f60826 100644
--- a/cli/js/deno.ts
+++ b/cli/js/deno.ts
@@ -85,7 +85,16 @@ export {
   ShutdownMode,
   shutdown
 } from "./net.ts";
-export { dir, env, exit, isTTY, execPath, hostname, loadavg } from "./os.ts";
+export {
+  dir,
+  env,
+  exit,
+  isTTY,
+  execPath,
+  hostname,
+  loadavg,
+  osRelease
+} from "./os.ts";
 export {
   permissions,
   PermissionName,
diff --git a/cli/js/dispatch.ts b/cli/js/dispatch.ts
index 93f6dc055..fc1c69a62 100644
--- a/cli/js/dispatch.ts
+++ b/cli/js/dispatch.ts
@@ -81,6 +81,7 @@ export let OP_SIGNAL_BIND: number;
 export let OP_SIGNAL_UNBIND: number;
 export let OP_SIGNAL_POLL: number;
 export let OP_LOADAVG: number;
+export let OP_OS_RELEASE: number;
 
 const PLUGIN_ASYNC_HANDLER_MAP: Map<number, AsyncHandler> = new Map();
 
diff --git a/cli/js/lib.deno.ns.d.ts b/cli/js/lib.deno.ns.d.ts
index d1770a15a..0c9430869 100644
--- a/cli/js/lib.deno.ns.d.ts
+++ b/cli/js/lib.deno.ns.d.ts
@@ -52,6 +52,12 @@ declare namespace Deno {
    */
   export function hostname(): string;
 
+  /** Get the OS release. Requires the `--allow-env` flag.
+   *
+   *       console.log(Deno.osRelease());
+   */
+  export function osRelease(): string;
+
   /** Exit the Deno process with optional exit code. */
   export function exit(code?: number): never;
 
diff --git a/cli/js/os.ts b/cli/js/os.ts
index d3c0d1b72..7953c2cef 100644
--- a/cli/js/os.ts
+++ b/cli/js/os.ts
@@ -29,6 +29,15 @@ export function hostname(): string {
   return sendSync(dispatch.OP_HOSTNAME);
 }
 
+/** Get OS release.
+ * Requires the `--allow-env` flag.
+ *
+ *       console.log(Deno.osRelease());
+ */
+export function osRelease(): string {
+  return sendSync(dispatch.OP_OS_RELEASE);
+}
+
 /** Exit the Deno process with optional exit code. */
 export function exit(code = 0): never {
   sendSync(dispatch.OP_EXIT, { code });
diff --git a/cli/js/os_test.ts b/cli/js/os_test.ts
index 325cbdaa6..905a4efaf 100644
--- a/cli/js/os_test.ts
+++ b/cli/js/os_test.ts
@@ -315,3 +315,19 @@ testPerm({ env: false }, function hostnamePerm(): void {
   }
   assert(caughtError);
 });
+
+testPerm({ env: true }, function releaseDir(): void {
+  assertNotEquals(Deno.osRelease(), "");
+});
+
+testPerm({ env: false }, function releasePerm(): void {
+  let caughtError = false;
+  try {
+    Deno.osRelease();
+  } catch (err) {
+    caughtError = true;
+    assert(err instanceof Deno.Err.PermissionDenied);
+    assertEquals(err.name, "PermissionDenied");
+  }
+  assert(caughtError);
+});