Add all option

index.d.ts

@@ -39,7 +39,7 @@ declare namespace execa {
 		readonly localDir?: string;
 
 		/**
-		Buffer the output from the spawned process. When buffering is disabled you must consume the output of the `stdout` and `stderr` streams because the promise will not be resolved/rejected until they have completed.
+		Buffer the output from the spawned process. When set to `false`, you must read the output of `stdout` and `stderr` (or `all` if the `all` option is `true`). Otherwise the returned promise will not be resolved/rejected.
 
 		If the spawned process fails, `error.stdout`, `error.stderr`, and `error.all` will contain the buffered data.
 
@@ -75,6 +75,13 @@ declare namespace execa {
 		*/
 		readonly reject?: boolean;
 
+		/**
+		Add an `.all` property on the promise and the resolved value. The property contains the output of the process with `stdout` and `stderr` interleaved.
+
+		@default false
+		*/
+		readonly all?: boolean;
+
 		/**
 		Strip the final [newline character](https://en.wikipedia.org/wiki/Newline) from the output.
 
@@ -265,8 +272,12 @@ declare namespace execa {
 		extends ExecaSyncReturnValue<StdoutErrorType> {
 		/**
 		The output of the process with `stdout` and `stderr` interleaved.
+
+		This is `undefined` if either:
+		- the `all` option is `false` (default value)
+		- `execa.sync()` was used
 		*/
-		all: StdoutErrorType;
+		all?: StdoutErrorType;
 
 		/**
 		Whether the process was canceled.
@@ -287,8 +298,12 @@ declare namespace execa {
 		extends ExecaSyncError<StdoutErrorType> {
 		/**
 		The output of the process with `stdout` and `stderr` interleaved.
+
+		This is `undefined` if either:
+		- the `all` option is `false` (default value)
+		- `execa.sync()` was used
 		*/
-		all: StdoutErrorType;
+		all?: StdoutErrorType;
 
 		/**
 		Whether the process was canceled.
@@ -325,7 +340,9 @@ declare namespace execa {
 		/**
 		Stream combining/interleaving [`stdout`](https://nodejs.org/api/child_process.html#child_process_subprocess_stdout) and [`stderr`](https://nodejs.org/api/child_process.html#child_process_subprocess_stderr).
 
-		This is `undefined` when both `stdout` and `stderr` options are set to [`'pipe'`, `'ipc'`, `Stream` or `integer`](https://nodejs.org/dist/latest-v6.x/docs/api/child_process.html#child_process_options_stdio).
+		This is `undefined` if either:
+			- the `all` option is `false` (the default value)
+			- both `stdout` and `stderr` options are set to [`'inherit'`, `'ipc'`, `Stream` or `integer`](https://nodejs.org/dist/latest-v6.x/docs/api/child_process.html#child_process_options_stdio)
 		*/
 		all?: ReadableStream;
 	}

index.js

@@ -40,6 +40,7 @@ const handleArgs = (file, args, options = {}) => {
 		encoding: 'utf8',
 		reject: true,
 		cleanup: true,
+		all: false,
 		...options,
 		windowsHide: true
 	};
@@ -150,7 +151,7 @@ const execa = (file, args, options) => {
 
 	handleInput(spawned, parsed.options.input);
 
-	spawned.all = makeAllStream(spawned);
+	spawned.all = makeAllStream(spawned, parsed.options);
 
 	return mergePromise(spawned, handlePromiseOnce);
 };

index.test-d.ts

@@ -20,7 +20,7 @@ try {
 	expectType<string>(unicornsResult.exitCodeName);
 	expectType<string>(unicornsResult.stdout);
 	expectType<string>(unicornsResult.stderr);
-	expectType<string>(unicornsResult.all);
+	expectType<string | undefined>(unicornsResult.all);
 	expectType<boolean>(unicornsResult.failed);
 	expectType<boolean>(unicornsResult.timedOut);
 	expectType<boolean>(unicornsResult.isCanceled);
@@ -34,7 +34,7 @@ try {
 	expectType<string>(execaError.exitCodeName);
 	expectType<string>(execaError.stdout);
 	expectType<string>(execaError.stderr);
-	expectType<string>(execaError.all);
+	expectType<string | undefined>(execaError.all);
 	expectType<boolean>(execaError.failed);
 	expectType<boolean>(execaError.timedOut);
 	expectType<boolean>(execaError.isCanceled);
@@ -99,6 +99,7 @@ execa('unicorns', {stderr: 'inherit'});
 execa('unicorns', {stderr: process.stderr});
 execa('unicorns', {stderr: 1});
 execa('unicorns', {stderr: undefined});
+execa('unicorns', {all: true});
 execa('unicorns', {reject: false});
 execa('unicorns', {stripFinalNewline: false});
 execa('unicorns', {extendEnv: false});

lib/stream.js

@@ -19,8 +19,8 @@ const handleInput = (spawned, input) => {
 };
 
 // `all` interleaves `stdout` and `stderr`
-const makeAllStream = spawned => {
-	if (!spawned.stdout && !spawned.stderr) {
+const makeAllStream = (spawned, {all}) => {
+	if (!all || (!spawned.stdout && !spawned.stderr)) {
 		return;
 	}
 
@@ -53,19 +53,10 @@ const getBufferedData = async (stream, streamPromise) => {
 };
 
 const getStreamPromise = (stream, {encoding, buffer, maxBuffer}) => {
-	if (!stream) {
+	if (!stream || !buffer) {
 		return;
 	}
 
-	if (!buffer) {
-		// TODO: Use `ret = util.promisify(stream.finished)(stream);` when targeting Node.js 10
-		return new Promise((resolve, reject) => {
-			stream
-				.once('end', resolve)
-				.once('error', reject);
-		});
-	}
-
 	if (encoding) {
 		return getStream(stream, {encoding, maxBuffer});
 	}

readme.md

@@ -168,7 +168,9 @@ Type: `ReadableStream | undefined`
 
 Stream combining/interleaving [`stdout`](https://nodejs.org/api/child_process.html#child_process_subprocess_stdout) and [`stderr`](https://nodejs.org/api/child_process.html#child_process_subprocess_stderr).
 
-This is `undefined` when both [`stdout`](#stdout-1) and [`stderr`](#stderr-1) options are set to [`'pipe'`, `'ipc'`, `Stream` or `integer`](https://nodejs.org/dist/latest-v6.x/docs/api/child_process.html#child_process_options_stdio).
+This is `undefined` if either:
+  - the [`all` option](#all-2) is `false` (the default value)
+  - both [`stdout`](#stdout-1) and [`stderr`](#stderr-1) options are set to [`'inherit'`, `'ipc'`, `Stream` or `integer`](https://nodejs.org/dist/latest-v6.x/docs/api/child_process.html#child_process_options_stdio)
 
 ### execa.sync(file, [arguments], [options])
 
@@ -237,9 +239,13 @@ The output of the process on stderr.
 
 #### all
 
-Type: `string | Buffer`
+Type: `string | Buffer | undefined`
+
+The output of the process with `stdout` and `stderr` interleaved.
 
-The output of the process on both stdout and stderr. `undefined` if `execa.sync()` was used.
+This is `undefined` if either:
+  - the [`all` option](#all-2) is `false` (the default value)
+  - `execa.sync()` was used
 
 #### failed
 
@@ -304,7 +310,7 @@ Preferred path to find locally installed binaries in (use with `preferLocal`).
 Type: `boolean`<br>
 Default: `true`
 
-Buffer the output from the spawned process. When buffering is disabled you must consume the output of the `stdout` and `stderr` streams because the promise will not be resolved/rejected until they have completed.
+Buffer the output from the spawned process. When set to `false`, you must read the output of [`stdout`](#stdout-1) and [`stderr`](#stderr-1) (or [`all`](#all) if the [`all`](#all-2) option is `true`). Otherwise the returned promise will not be resolved/rejected.
 
 If the spawned process fails, [`error.stdout`](#stdout), [`error.stderr`](#stderr), and [`error.all`](#all) will contain the buffered data.
 
@@ -336,6 +342,13 @@ Default: `pipe`
 
 Same options as [`stdio`](https://nodejs.org/dist/latest-v6.x/docs/api/child_process.html#child_process_options_stdio).
 
+#### all
+
+Type: `boolean`<br>
+Default: `false`
+
+Add an `.all` property on the [promise](#all) and the [resolved value](#all-1). The property contains the output of the process with `stdout` and `stderr` interleaved.
+
 #### reject
 
 Type: `boolean`<br>

test/error.js

@@ -10,7 +10,7 @@ const TIMEOUT_REGEXP = /timed out after/;
 const getExitRegExp = exitMessage => new RegExp(`failed with exit code ${exitMessage}`);
 
 test('stdout/stderr/all available on errors', async t => {
-	const {stdout, stderr, all} = await t.throwsAsync(execa('exit', ['2']), {message: getExitRegExp('2')});
+	const {stdout, stderr, all} = await t.throwsAsync(execa('exit', ['2'], {all: true}), {message: getExitRegExp('2')});
 	t.is(typeof stdout, 'string');
 	t.is(typeof stderr, 'string');
 	t.is(typeof all, 'string');
@@ -21,7 +21,7 @@ const WRONG_COMMAND = process.platform === 'win32' ?
 	'';
 
 test('stdout/stderr/all on process errors', async t => {
-	const {stdout, stderr, all} = await t.throwsAsync(execa('wrong command'));
+	const {stdout, stderr, all} = await t.throwsAsync(execa('wrong command', {all: true}));
 	t.is(stdout, '');
 	t.is(stderr, WRONG_COMMAND);
 	t.is(all, WRONG_COMMAND);

test/fixtures/max-buffer

@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 'use strict';
-const output = process.argv[2];
-const bytes = Number(process.argv[3]);
+const output = process.argv[2] || 'stdout';
+const bytes = Number(process.argv[3] || 1e7);
 
 process[output].write('.'.repeat(bytes - 1) + '\n');

test/stream.js

@@ -27,19 +27,24 @@ test('pass `stderr` to a file descriptor', async t => {
 });
 
 test.serial('result.all shows both `stdout` and `stderr` intermixed', async t => {
-	const {all} = await execa('noop-132');
+	const {all} = await execa('noop-132', {all: true});
 	t.is(all, '132');
 });
 
+test('result.all is undefined unless opts.all is true', async t => {
+	const {all} = await execa('noop');
+	t.is(all, undefined);
+});
+
 test('stdout/stderr/all are undefined if ignored', async t => {
-	const {stdout, stderr, all} = await execa('noop', {stdio: 'ignore'});
+	const {stdout, stderr, all} = await execa('noop', {stdio: 'ignore', all: true});
 	t.is(stdout, undefined);
 	t.is(stderr, undefined);
 	t.is(all, undefined);
 });
 
 test('stdout/stderr/all are undefined if ignored in sync mode', t => {
-	const {stdout, stderr, all} = execa.sync('noop', {stdio: 'ignore'});
+	const {stdout, stderr, all} = execa.sync('noop', {stdio: 'ignore', all: true});
 	t.is(stdout, undefined);
 	t.is(stderr, undefined);
 	t.is(all, undefined);
@@ -98,14 +103,14 @@ test('helpful error trying to provide an input stream in sync mode', t => {
 
 test('maxBuffer affects stdout', async t => {
 	await t.notThrowsAsync(execa('max-buffer', ['stdout', '10'], {maxBuffer: 10}));
-	const {stdout, all} = await t.throwsAsync(execa('max-buffer', ['stdout', '11'], {maxBuffer: 10}), /max-buffer stdout/);
+	const {stdout, all} = await t.throwsAsync(execa('max-buffer', ['stdout', '11'], {maxBuffer: 10, all: true}), /max-buffer stdout/);
 	t.is(stdout, '.'.repeat(10));
 	t.is(all, '.'.repeat(10));
 });
 
 test('maxBuffer affects stderr', async t => {
 	await t.notThrowsAsync(execa('max-buffer', ['stderr', '10'], {maxBuffer: 10}));
-	const {stderr, all} = await t.throwsAsync(execa('max-buffer', ['stderr', '11'], {maxBuffer: 10}), /max-buffer stderr/);
+	const {stderr, all} = await t.throwsAsync(execa('max-buffer', ['stderr', '11'], {maxBuffer: 10, all: true}), /max-buffer stderr/);
 	t.is(stderr, '.'.repeat(10));
 	t.is(all, '.'.repeat(10));
 });
@@ -114,8 +119,7 @@ test('do not buffer stdout when `buffer` set to `false`', async t => {
 	const promise = execa('max-buffer', ['stdout', '10'], {buffer: false});
 	const [result, stdout] = await Promise.all([
 		promise,
-		getStream(promise.stdout),
-		getStream(promise.all)
+		getStream(promise.stdout)
 	]);
 
 	t.is(result.stdout, undefined);
@@ -126,8 +130,7 @@ test('do not buffer stderr when `buffer` set to `false`', async t => {
 	const promise = execa('max-buffer', ['stderr', '10'], {buffer: false});
 	const [result, stderr] = await Promise.all([
 		promise,
-		getStream(promise.stderr),
-		getStream(promise.all)
+		getStream(promise.stderr)
 	]);
 
 	t.is(result.stderr, undefined);
@@ -139,3 +142,45 @@ test('do not buffer when streaming', async t => {
 	const result = await getStream(stdout);
 	t.is(result, '....................\n');
 });
+
+test('buffer: false > promise resolves', async t => {
+	await t.notThrowsAsync(execa('noop', {buffer: false}));
+});
+
+test('buffer: false > promise resolves when output is big but is not pipable', async t => {
+	await t.notThrowsAsync(execa('max-buffer', {buffer: false, stdout: 'ignore'}));
+});
+
+test('buffer: false > promise resolves when output is big and is read', async t => {
+	const cp = execa('max-buffer', {buffer: false});
+	cp.stdout.resume();
+	cp.stderr.resume();
+	await t.notThrowsAsync(cp);
+});
+
+test('buffer: false > promise resolves when output is big and "all" is used and is read', async t => {
+	const cp = execa('max-buffer', {buffer: false, all: true});
+	cp.all.resume();
+	await t.notThrowsAsync(cp);
+});
+
+test('buffer: false > promise rejects when process returns non-zero', async t => {
+	const cp = execa('fail', {buffer: false});
+	const {exitCode} = await t.throwsAsync(cp);
+	t.is(exitCode, 2);
+});
+
+const BUFFER_TIMEOUT = 1e3;
+
+test.serial('buffer: false > promise does not resolve when output is big and is not read', async t => {
+	const {timedOut} = await t.throwsAsync(execa('max-buffer', {buffer: false, timeout: BUFFER_TIMEOUT}));
+	t.true(timedOut);
+});
+
+test.serial('buffer: false > promise does not resolve when output is big and "all" is used but not read', async t => {
+	const cp = execa('max-buffer', {buffer: false, all: true, timeout: BUFFER_TIMEOUT});
+	cp.stdout.resume();
+	cp.stderr.resume();
+	const {timedOut} = await t.throwsAsync(cp);
+	t.true(timedOut);
+});