Add pid

utils/pid.test.ts

@@ -1,8 +1,8 @@
 import { test } from "@cross/test";
-import { assertTrue } from "@std/assert";
+import { assertEquals } from "@std/assert";
 
 import { pid } from "./pid.ts";
 
 test("Aliases don't override original arguments", () => {
-  assertTrue(pid() > 0);
+  assertEquals(pid() > 0, true);
 });

utils/pid.ts

@@ -12,7 +12,7 @@ import { CurrentRuntime, Runtime } from "@cross/runtime";
 export function pid(): number {
   if (CurrentRuntime === Runtime.Deno) {
     //@ts-ignore cross-runtime
-    return crossPid();
+    return Deno.pid;
   } else {
     //@ts-ignore cross-runtime
     return process.pid;