Add fork method

Fix sindresorhus#65
GMartigny · Apr 3, 2019 · ec492d8 · ec492d8
1 parent 7702b8e
commit ec492d8
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Showing 4 changed files with 36 additions and 19 deletions.
diff --git a/index.js b/index.js
@@ -427,3 +427,12 @@ module.exports.sync = (command, args, options) => {
 };
 
 module.exports.shellSync = (command, options) => handleShell(execa.sync, command, options);
+
+module.exports.fork = (filePath, args, options) =>{
+	return execa('node', [filePath, ...(args || [])], {
+		...options,
+		ipc: 'pipe',
+		execPath: path.resolve(filePath),
+		shell: false,
+	});
+};
diff --git a/lib/stdio.js b/lib/stdio.js
@@ -1,5 +1,5 @@
 'use strict';
-const alias = ['stdin', 'stdout', 'stderr'];
+const alias = ['stdin', 'stdout', 'stderr', 'ipc'];
 
 const hasAlias = opts => alias.some(x => Boolean(opts[x]));
 

diff --git a/test.js b/test.js
@@ -640,3 +640,9 @@ test('calling cancel method on a process which has been killed does not make err
 	const error = await t.throwsAsync(subprocess);
 	t.false(error.isCanceled);
 });
+
+test.only('fork', async t => {
+	const result = await execa.fork('./fixtures/simple-log.js');
+
+	t.is(result.stdout, 'ok');
+});
diff --git a/test/stdio.js b/test/stdio.js
@@ -27,24 +27,26 @@ test(macro, null, undefined);
 test(macro, {stdio: 'inherit'}, 'inherit');
 test(macro, {stdio: 'pipe'}, 'pipe');
 test(macro, {stdio: 'ignore'}, 'ignore');
-test(macro, {stdio: [0, 1, 2]}, [0, 1, 2]);
-
-test(macro, {}, [undefined, undefined, undefined]);
-test(macro, {stdio: []}, [undefined, undefined, undefined]);
-test(macro, {stdin: 'pipe'}, ['pipe', undefined, undefined]);
-test(macro, {stdout: 'ignore'}, [undefined, 'ignore', undefined]);
-test(macro, {stderr: 'inherit'}, [undefined, undefined, 'inherit']);
-test(macro, {stdin: 'pipe', stdout: 'ignore', stderr: 'inherit'}, ['pipe', 'ignore', 'inherit']);
-test(macro, {stdin: 'pipe', stdout: 'ignore'}, ['pipe', 'ignore', undefined]);
-test(macro, {stdin: 'pipe', stderr: 'inherit'}, ['pipe', undefined, 'inherit']);
-test(macro, {stdout: 'ignore', stderr: 'inherit'}, [undefined, 'ignore', 'inherit']);
-test(macro, {stdin: 0, stdout: 1, stderr: 2}, [0, 1, 2]);
-test(macro, {stdin: 0, stdout: 1}, [0, 1, undefined]);
-test(macro, {stdin: 0, stderr: 2}, [0, undefined, 2]);
-test(macro, {stdout: 1, stderr: 2}, [undefined, 1, 2]);
+test(macro, {stdio: [0, 1, 2, 3]}, [0, 1, 2, 3]);
+
+test(macro, {}, [undefined, undefined, undefined, undefined]);
+test(macro, {stdio: []}, [undefined, undefined, undefined, undefined]);
+test(macro, {stdin: 'pipe'}, ['pipe', undefined, undefined, undefined]);
+test(macro, {stdout: 'ignore'}, [undefined, 'ignore', undefined, undefined]);
+test(macro, {stderr: 'inherit'}, [undefined, undefined, 'inherit', undefined]);
+test(macro, {ipc: 'pipe'}, [undefined, undefined, undefined, 'pipe']);
+test(macro, {stdin: 'pipe', stdout: 'ignore', stderr: 'inherit'}, ['pipe', 'ignore', 'inherit', undefined]);
+test(macro, {stdin: 'pipe', stdout: 'ignore'}, ['pipe', 'ignore', undefined, undefined]);
+test(macro, {stdin: 'pipe', stderr: 'inherit'}, ['pipe', undefined, 'inherit', undefined]);
+test(macro, {stdout: 'ignore', stderr: 'inherit'}, [undefined, 'ignore', 'inherit', undefined]);
+test(macro, {stdin: 0, stdout: 1, stderr: 2}, [0, 1, 2, undefined]);
+test(macro, {stdin: 0, stdout: 1}, [0, 1, undefined, undefined]);
+test(macro, {stdin: 0, stderr: 2}, [0, undefined, 2, undefined]);
+test(macro, {stdout: 1, stderr: 2}, [undefined, 1, 2, undefined]);
+test(macro, {ipc: 3, stderr: 2}, [undefined, undefined, 2, 3]);
 
 test(macro, {stdio: {foo: 'bar'}}, new TypeError('Expected `stdio` to be of type `string` or `Array`, got `object`'));
 
-test(macro, {stdin: 'inherit', stdio: 'pipe'}, new Error('It\'s not possible to provide `stdio` in combination with one of `stdin`, `stdout`, `stderr`'));
-test(macro, {stdin: 'inherit', stdio: ['pipe']}, new Error('It\'s not possible to provide `stdio` in combination with one of `stdin`, `stdout`, `stderr`'));
-test(macro, {stdin: 'inherit', stdio: [undefined, 'pipe']}, new Error('It\'s not possible to provide `stdio` in combination with one of `stdin`, `stdout`, `stderr`'));
+test(macro, {stdin: 'inherit', stdio: 'pipe'}, new Error('It\'s not possible to provide `stdio` in combination with one of `stdin`, `stdout`, `stderr`, `ipc`'));
+test(macro, {stdin: 'inherit', stdio: ['pipe']}, new Error('It\'s not possible to provide `stdio` in combination with one of `stdin`, `stdout`, `stderr`, `ipc`'));
+test(macro, {stdin: 'inherit', stdio: [undefined, 'pipe']}, new Error('It\'s not possible to provide `stdio` in combination with one of `stdin`, `stdout`, `stderr`, `ipc`'));