feat: std/node/process (#3368)

std/node/process.ts

@@ -0,0 +1,42 @@
+import { notImplemented } from "./_utils.ts";
+
+const version = `v${Deno.version.deno}`;
+
+const versions = {
+  node: Deno.version.deno,
+  ...Deno.version
+};
+
+const osToPlatform = (os: Deno.OperatingSystem): string =>
+  os === "win" ? "win32" : os === "mac" ? "darwin" : os;
+
+const platform = osToPlatform(Deno.build.os);
+
+const { arch } = Deno.build;
+
+const { pid, cwd, chdir, exit } = Deno;
+
+function on(_event: string, _callback: Function): void {
+  // TODO(rsp): to be implemented
+  notImplemented();
+}
+
+export const process = {
+  version,
+  versions,
+  platform,
+  arch,
+  pid,
+  cwd,
+  chdir,
+  exit,
+  on,
+  get env(): { [index: string]: string } {
+    // using getter to avoid --allow-env unless it's used
+    return Deno.env();
+  },
+  get argv(): string[] {
+    // Deno.execPath() also requires --allow-env
+    return [Deno.execPath(), ...Deno.args];
+  }
+};

std/node/process_test.ts

@@ -0,0 +1,103 @@
+import { test } from "../testing/mod.ts";
+import { assert, assertThrows, assertEquals } from "../testing/asserts.ts";
+import { process } from "./process.ts";
+
+// NOTE: Deno.execPath() (and thus process.argv) currently requires --allow-env
+// (Also Deno.env() (and process.env) requires --allow-env but it's more obvious)
+
+test({
+  name: "process.cwd and process.chdir success",
+  fn() {
+    // this should be run like other tests from directory up
+    assert(process.cwd().match(/\Wstd$/));
+    process.chdir("node");
+    assert(process.cwd().match(/\Wnode$/));
+    process.chdir("..");
+    assert(process.cwd().match(/\Wstd$/));
+  }
+});
+
+test({
+  name: "process.chdir failure",
+  fn() {
+    assertThrows(
+      () => {
+        process.chdir("non-existent-directory-name");
+      },
+      Deno.DenoError,
+      "file"
+      // On every OS Deno returns: "No such file" except for Windows, where it's:
+      // "The system cannot find the file specified. (os error 2)" so "file" is
+      // the only common string here.
+      // TODO(rsp): Crazy idea: 404 for things like this?
+      // It would be nice to have error codes like 404 or 403 in addition to strings.
+    );
+  }
+});
+
+test({
+  name: "process.version",
+  fn() {
+    assertEquals(typeof process, "object");
+    assertEquals(typeof process.version, "string");
+    assertEquals(typeof process.versions, "object");
+    assertEquals(typeof process.versions.node, "string");
+  }
+});
+
+test({
+  name: "process.platform",
+  fn() {
+    assertEquals(typeof process.platform, "string");
+  }
+});
+
+test({
+  name: "process.arch",
+  fn() {
+    assertEquals(typeof process.arch, "string");
+    // TODO(rsp): make sure that the arch strings should be the same in Node and Deno:
+    assertEquals(process.arch, Deno.build.arch);
+  }
+});
+
+test({
+  name: "process.pid",
+  fn() {
+    assertEquals(typeof process.pid, "number");
+    assertEquals(process.pid, Deno.pid);
+  }
+});
+
+test({
+  name: "process.on",
+  fn() {
+    assertEquals(typeof process.on, "function");
+    assertThrows(
+      () => {
+        process.on("uncaughtException", (_err: Error) => {});
+      },
+      Error,
+      "implemented"
+    );
+  }
+});
+
+test({
+  name: "process.argv",
+  fn() {
+    assert(Array.isArray(process.argv));
+    assert(
+      process.argv[0].match(/[^/\\]*deno[^/\\]*$/),
+      "deno included in the file name of argv[0]"
+    );
+    // we cannot test for anything else (we see test runner arguments here)
+  }
+});
+
+test({
+  name: "process.env",
+  fn() {
+    assertEquals(typeof process.env.PATH, "string");
+  }
+});