1 files changed, 67 insertions, 0 deletions
diff --git a/cli/js/ops/runtime.ts b/cli/js/ops/runtime.ts
new file mode 100644
index 000000000..7538ce12f
--- /dev/null
+++ b/cli/js/ops/runtime.ts
@@ -0,0 +1,67 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+import { sendSync } from "./dispatch_json.ts";
+
+// TODO(bartlomieju): these two types are duplicated
+// in `cli/js/build.ts` - deduplicate
+export type OperatingSystem = "mac" | "win" | "linux";
+export type Arch = "x64" | "arm64";
+
+export interface Start {
+  cwd: string;
+  pid: number;
+  args: string[];
+  location: string; // Absolute URL.
+  repl: boolean;
+  debugFlag: boolean;
+  depsFlag: boolean;
+  typesFlag: boolean;
+  versionFlag: boolean;
+  denoVersion: string;
+  v8Version: string;
+  tsVersion: string;
+  noColor: boolean;
+  os: OperatingSystem;
+  arch: Arch;
+}
+
+export function start(): Start {
+  return sendSync("op_start");
+}
+
+export interface Metrics {
+  opsDispatched: number;
+  opsDispatchedSync: number;
+  opsDispatchedAsync: number;
+  opsDispatchedAsyncUnref: number;
+  opsCompleted: number;
+  opsCompletedSync: number;
+  opsCompletedAsync: number;
+  opsCompletedAsyncUnref: number;
+  bytesSentControl: number;
+  bytesSentData: number;
+  bytesReceived: number;
+}
+
+/** Receive metrics from the privileged side of Deno.
+ *
+ *      > console.table(Deno.metrics())
+ *      ┌─────────────────────────┬────────┐
+ *      │         (index)         │ Values │
+ *      ├─────────────────────────┼────────┤
+ *      │      opsDispatched      │   3    │
+ *      │    opsDispatchedSync    │   2    │
+ *      │   opsDispatchedAsync    │   1    │
+ *      │ opsDispatchedAsyncUnref │   0    │
+ *      │      opsCompleted       │   3    │
+ *      │    opsCompletedSync     │   2    │
+ *      │    opsCompletedAsync    │   1    │
+ *      │ opsCompletedAsyncUnref  │   0    │
+ *      │    bytesSentControl     │   73   │
+ *      │      bytesSentData      │   0    │
+ *      │      bytesReceived      │  375   │
+ *      └─────────────────────────┴────────┘
+ */
+export function metrics(): Metrics {
+  return sendSync("op_metrics");
+}