fix(node): setting process.exitCode should change exit code of process (#21429)

cli/tests/unit_node/process_test.ts

@@ -681,9 +681,58 @@ Deno.test("process.memoryUsage.rss()", () => {
 });
 
 Deno.test("process.exitCode", () => {
-  assert(process.exitCode === undefined);
+  assertEquals(process.exitCode, undefined);
   process.exitCode = 127;
-  assert(process.exitCode === 127);
+  assertEquals(process.exitCode, 127);
+  // deno-lint-ignore no-explicit-any
+  (process.exitCode as any) = "asdf";
+  // deno-lint-ignore no-explicit-any
+  assertEquals(process.exitCode as any, "asdf");
+  // deno-lint-ignore no-explicit-any
+  (process.exitCode as any) = "10";
+  process.exitCode = undefined; // reset
+});
+
+async function exitCodeTest(codeText: string, expectedExitCode: number) {
+  const command = new Deno.Command(Deno.execPath(), {
+    args: [
+      "eval",
+      codeText,
+    ],
+    cwd: testDir,
+  });
+  const { code } = await command.output();
+  assertEquals(code, expectedExitCode);
+}
+
+Deno.test("process.exitCode in should change exit code", async () => {
+  await exitCodeTest(
+    "import process from 'node:process'; process.exitCode = 127;",
+    127,
+  );
+  await exitCodeTest(
+    "import process from 'node:process'; process.exitCode = 2.5;",
+    2,
+  );
+  await exitCodeTest(
+    "import process from 'node:process'; process.exitCode = '10';",
+    10,
+  );
+  await exitCodeTest(
+    "import process from 'node:process'; process.exitCode = '0x10';",
+    16,
+  );
+  await exitCodeTest(
+    "import process from 'node:process'; process.exitCode = NaN;",
+    0,
+  );
+});
+
+Deno.test("Deno.exit should override process exit", async () => {
+  await exitCodeTest(
+    "import process from 'node:process'; process.exitCode = 10; Deno.exit(12);",
+    12,
+  );
 });
 
 Deno.test("process.config", () => {

ext/node/polyfills/process.ts

@@ -76,15 +76,16 @@ const notImplementedEvents = [
 ];
 
 export const argv: string[] = [];
+let globalProcessExitCode: number | undefined = undefined;
 
 /** https://nodejs.org/api/process.html#process_process_exit_code */
 export const exit = (code?: number | string) => {
   if (code || code === 0) {
     if (typeof code === "string") {
       const parsedCode = parseInt(code);
-      process.exitCode = isNaN(parsedCode) ? undefined : parsedCode;
+      globalProcessExitCode = isNaN(parsedCode) ? undefined : parsedCode;
     } else {
-      process.exitCode = code;
+      globalProcessExitCode = code;
     }
   }
 
@@ -426,7 +427,17 @@ class Process extends EventEmitter {
   _exiting = _exiting;
 
   /** https://nodejs.org/api/process.html#processexitcode_1 */
-  exitCode: undefined | number = undefined;
+  get exitCode() {
+    return globalProcessExitCode;
+  }
+
+  set exitCode(code: number | undefined) {
+    globalProcessExitCode = code;
+    code = parseInt(code) || 0;
+    if (!isNaN(code)) {
+      ops.op_set_exit_code(code);
+    }
+  }
 
   // Typed as any to avoid importing "module" module for types
   // deno-lint-ignore no-explicit-any