src: override inherited task runner environment

src/node_task_runner.cc

@@ -11,6 +11,15 @@ static constexpr const char* env_var_separator = ";";
 static constexpr const char* env_var_separator = ":";
 #endif  // _WIN32
 
+static bool IsNodeRunEnvironmentVariable(const std::string& name) {
+#ifdef _WIN32
+  return StringEqualNoCase(name.c_str(), "NODE_RUN_SCRIPT_NAME") ||
+         StringEqualNoCase(name.c_str(), "NODE_RUN_PACKAGE_JSON_PATH");
+#else
+  return name == "NODE_RUN_SCRIPT_NAME" || name == "NODE_RUN_PACKAGE_JSON_PATH";
+#endif  // _WIN32
+}
+
 ProcessRunner::ProcessRunner(std::shared_ptr<InitializationResultImpl> result,
                              const std::filesystem::path& package_json_path,
                              std::string_view script_name,
@@ -108,6 +117,12 @@ void ProcessRunner::SetEnvironmentVariables() {
     }
 #endif  // _WIN32
 
+    // These variables describe the current task and are added below. Do not
+    // retain inherited values, as that would create duplicate entries.
+    if (IsNodeRunEnvironmentVariable(name)) {
+      continue;
+    }
+
     if (StringEqualNoCase(name.c_str(), "path")) {
       // Add path env variable to the beginning of the PATH
       value = path_env_var_ + value;

test/parallel/test-node-run.js

@@ -189,6 +189,29 @@ describe('node --run [command]', () => {
     assert.strictEqual(child.code, 0);
   });
 
+  it('should override inherited special environment variables', async () => {
+    const scriptName = `special-env-variables${envSuffix}`;
+    const packageJsonPath = fixtures.path('run-script/package.json');
+    const child = await common.spawnPromisified(
+      process.execPath,
+      [ '--run', scriptName],
+      {
+        cwd: fixtures.path('run-script'),
+        env: {
+          ...process.env,
+          NODE_RUN_SCRIPT_NAME: 'inherited-script-name',
+          NODE_RUN_PACKAGE_JSON_PATH: 'inherited-package-json-path',
+        },
+      },
+    );
+    assert.deepStrictEqual(child.stdout.trim().split(/\r?\n/), [
+      scriptName,
+      packageJsonPath,
+    ]);
+    assert.strictEqual(child.stderr, '');
+    assert.strictEqual(child.code, 0);
+  });
+
   it('will search parent directories for a package.json file', async () => {
     const packageJsonPath = fixtures.path('run-script/package.json');
     const child = await common.spawnPromisified(