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child_process: handling fork( path, undefined / null, obj ) #22416

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5 changes: 5 additions & 0 deletions lib/child_process.js
Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,11 @@ exports.fork = function fork(modulePath /* , args, options */) {
args = arguments[pos++];
}

if (pos < arguments.length &&
(arguments[pos] === undefined || arguments[pos] === null)) {
pos++;
}

if (pos < arguments.length && arguments[pos] != null) {
if (typeof arguments[pos] !== 'object') {
throw new ERR_INVALID_ARG_VALUE(`arguments[${pos}]`, arguments[pos]);
Expand Down
1 change: 1 addition & 0 deletions test/fixtures/child-process-echo-options.js
Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
process.send({ env: process.env });
37 changes: 37 additions & 0 deletions test/parallel/test-child-process-fork-options.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,37 @@
'use strict';
const common = require('../common');
const fixtures = require('../common/fixtures');

// This test ensures that fork should parse options
// correctly if args is undefined or null
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const assert = require('assert');
const { fork } = require('child_process');

const expectedEnv = { foo: 'bar' };

{
const cp = fork(fixtures.path('child-process-echo-options.js'), undefined,
{ env: Object.assign({}, process.env, expectedEnv) });

cp.on('message', common.mustCall(({ env }) => {
assert.strictEqual(env.foo, expectedEnv.foo);
}));

cp.on('exit', common.mustCall((code) => {
assert.strictEqual(code, 0);
}));
}

{
const cp = fork(fixtures.path('child-process-echo-options.js'), null,
{ env: Object.assign({}, process.env, expectedEnv) });

cp.on('message', common.mustCall(({ env }) => {
assert.strictEqual(env.foo, expectedEnv.foo);
}));

cp.on('exit', common.mustCall((code) => {
assert.strictEqual(code, 0);
}));
}