fix(ext/node): process.argv0 (denoland#20925)

Fixes denoland#20924

cli/tests/unit_node/process_test.ts

@@ -258,6 +258,23 @@ Deno.test({
  },
 });
 
+Deno.test({
+ name: "process.argv0",
+ fn() {
+ assertEquals(typeof process.argv0, "string");
+ assert(
+ process.argv0.match(/[^/\\]*deno[^/\\]*$/),
+ "deno included in the file name of argv[0]",
+ );
+ // Setting should be a noop
+ process.argv0 = "foobar";
+ assert(
+ process.argv0.match(/[^/\\]*deno[^/\\]*$/),
+ "deno included in the file name of argv[0]",
+ );
+ },
+});
+
 Deno.test({
  name: "process.execArgv",
  fn() {

ext/node/polyfills/process.ts

@@ -45,6 +45,9 @@ import { isWindows } from "ext:deno_node/_util/os.ts";
 import * as io from "ext:deno_io/12_io.js";
 import { Command } from "ext:runtime/40_process.js";
 
+let argv0Getter = () => "";
+export let argv0 = "deno";
+
 // TODO(kt3k): This should be set at start up time
 export let arch = "";
 
@@ -408,6 +411,15 @@ class Process extends EventEmitter {
  */
  argv = argv;
 
+ get argv0() {
+ if (!argv0) {
+ argv0 = argv0Getter();
+ }
+ return argv0;
+ }
+
+ set argv0(_val) {}
+
  /** https://nodejs.org/api/process.html#process_process_chdir_directory */
  chdir = chdir;
 
@@ -851,23 +863,25 @@ function synchronizeListeners() {
 // Should be called only once, in `runtime/js/99_main.js` when the runtime is
 // bootstrapped.
 internals.__bootstrapNodeProcess = function (
- argv0: string | undefined,
+ argv0Val: string | undefined,
  args: string[],
  denoVersions: Record<string, string>,
 ) {
  // Overwrites the 1st item with getter.
- if (typeof argv0 === "string") {
+ if (typeof argv0Val === "string") {
  Object.defineProperty(argv, "0", {
  get: () => {
- return argv0;
+ return argv0Val;
  },
  });
+ argv0Getter = () => argv0Val;
  } else {
  Object.defineProperty(argv, "0", {
  get: () => {
  return Deno.execPath();
  },
  });
+ argv0Getter = () => Deno.execPath();
  }
 
  // Overwrites the 2st item with getter.