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ehmickyehmicky
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Allow appending to files (#1166)
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‎docs/bash.md‎

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@@ -605,6 +605,27 @@ await $({stdout: {file: 'output.txt'}})`npm run build`;
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[More info.](output.md#file-output)
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### Append stdout to a file
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```sh
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# Bash
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npm run build >> output.txt
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```
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```js
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// zx
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import {createWriteStream} from 'node:fs';
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await $`npm run build`.pipe(createWriteStream('output.txt', {flags: 'a'}));
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```
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```js
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// Execa
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await $({stdout: {file: 'output.txt', append: true}})`npm run build`;
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```
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[More info.](output.md#file-output)
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### Piping interleaved stdout and stderr to a file
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```sh

‎docs/output.md‎

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@@ -32,12 +32,19 @@ console.log(stderr); // string with errors
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await execa({stdout: {file: 'output.txt'}})`npm run build`;
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// Or:
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await execa({stdout: new URL('file:///path/to/output.txt')})`npm run build`;
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```
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```js
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// Redirect interleaved stdout and stderr to same file
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const output = {file: 'output.txt'};
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await execa({stdout: output, stderr: output})`npm run build`;
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```
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```js
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// Append instead of overwriting
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await execa({stdout: {file: 'output.txt', append: true}})`npm run build`;
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```
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## Terminal output
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The parent process' output can be re-used in the subprocess by passing `'inherit'`. This is especially useful to print to the terminal in command line applications.

‎lib/io/output-sync.js‎

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@@ -123,9 +123,9 @@ const logOutputSync = ({serializedResult, fdNumber, state, verboseInfo, encoding
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// When the `std*` target is a file path/URL or a file descriptor
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const writeToFiles = (serializedResult, stdioItems, outputFiles) => {
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for (const {path} of stdioItems.filter(({type}) => FILE_TYPES.has(type))) {
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for (const {path, append} of stdioItems.filter(({type}) => FILE_TYPES.has(type))) {
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const pathString = typeof path === 'string' ? path : path.toString();
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if (outputFiles.has(pathString)) {
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if (append || outputFiles.has(pathString)) {
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appendFileSync(path, serializedResult);
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} else {
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outputFiles.add(pathString);

‎lib/stdio/handle-async.js‎

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@@ -42,7 +42,7 @@ const addPropertiesAsync = {
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output: {
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...addProperties,
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fileUrl: ({value}) => ({stream: createWriteStream(value)}),
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filePath: ({value: {file}}) => ({stream: createWriteStream(file)}),
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filePath: ({value: {file, append}}) => ({stream: createWriteStream(file, append ? {flags: 'a'} : {})}),
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webStream: ({value}) => ({stream: Writable.fromWeb(value)}),
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iterable: forbiddenIfAsync,
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asyncIterable: forbiddenIfAsync,

‎lib/stdio/handle-sync.js‎

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@@ -48,7 +48,7 @@ const addPropertiesSync = {
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output: {
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...addProperties,
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fileUrl: ({value}) => ({path: value}),
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filePath: ({value: {file}}) => ({path: file}),
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filePath: ({value: {file, append}}) => ({path: file, append}),
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fileNumber: ({value}) => ({path: value}),
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iterable: forbiddenIfSync,
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string: forbiddenIfSync,

‎lib/stdio/type.js‎

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@@ -124,8 +124,10 @@ export const isUrl = value => Object.prototype.toString.call(value) === '[object
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export const isRegularUrl = value => isUrl(value) && value.protocol !== 'file:';
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const isFilePathObject = value => isPlainObj(value)
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&& Object.keys(value).length === 1
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&& Object.keys(value).length > 0
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&& Object.keys(value).every(key => FILE_PATH_KEYS.has(key))
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&& isFilePathString(value.file);
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const FILE_PATH_KEYS = new Set(['file', 'append']);
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export const isFilePathString = file => typeof file === 'string';
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export const isUnknownStdioString = (type, value) => type === 'native'

‎test-d/stdio/option/file-append-invalid.test-d.ts‎

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@@ -0,0 +1,44 @@
1+
import {expectError, expectNotAssignable} from 'tsd';
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import {
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execa,
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execaSync,
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type StdinOption,
6+
type StdinSyncOption,
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type StdoutStderrOption,
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type StdoutStderrSyncOption,
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} from '../../../index.js';
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const invalidFileAppend = {file: './test', append: 'true'} as const;
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expectError(await execa('unicorns', {stdin: invalidFileAppend}));
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expectError(execaSync('unicorns', {stdin: invalidFileAppend}));
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expectError(await execa('unicorns', {stdin: [invalidFileAppend]}));
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expectError(execaSync('unicorns', {stdin: [invalidFileAppend]}));
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expectError(await execa('unicorns', {stdout: invalidFileAppend}));
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expectError(execaSync('unicorns', {stdout: invalidFileAppend}));
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expectError(await execa('unicorns', {stdout: [invalidFileAppend]}));
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expectError(execaSync('unicorns', {stdout: [invalidFileAppend]}));
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expectError(await execa('unicorns', {stderr: invalidFileAppend}));
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expectError(execaSync('unicorns', {stderr: invalidFileAppend}));
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expectError(await execa('unicorns', {stderr: [invalidFileAppend]}));
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expectError(execaSync('unicorns', {stderr: [invalidFileAppend]}));
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expectError(await execa('unicorns', {stdio: invalidFileAppend}));
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expectError(execaSync('unicorns', {stdio: invalidFileAppend}));
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expectError(await execa('unicorns', {stdio: ['pipe', 'pipe', 'pipe', invalidFileAppend]}));
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expectError(execaSync('unicorns', {stdio: ['pipe', 'pipe', 'pipe', invalidFileAppend]}));
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expectError(await execa('unicorns', {stdio: ['pipe', 'pipe', 'pipe', [invalidFileAppend]]}));
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expectError(execaSync('unicorns', {stdio: ['pipe', 'pipe', 'pipe', [invalidFileAppend]]}));
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expectNotAssignable<StdinOption>(invalidFileAppend);
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expectNotAssignable<StdinSyncOption>(invalidFileAppend);
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expectNotAssignable<StdinOption>([invalidFileAppend]);
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expectNotAssignable<StdinSyncOption>([invalidFileAppend]);
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expectNotAssignable<StdoutStderrOption>(invalidFileAppend);
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expectNotAssignable<StdoutStderrSyncOption>(invalidFileAppend);
43+
expectNotAssignable<StdoutStderrOption>([invalidFileAppend]);
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expectNotAssignable<StdoutStderrSyncOption>([invalidFileAppend]);

‎test-d/stdio/option/file-append.test-d.ts‎

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@@ -0,0 +1,44 @@
1+
import {expectError, expectAssignable} from 'tsd';
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import {
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execa,
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execaSync,
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type StdinOption,
6+
type StdinSyncOption,
7+
type StdoutStderrOption,
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type StdoutStderrSyncOption,
9+
} from '../../../index.js';
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const fileAppend = {file: './test', append: true} as const;
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13+
await execa('unicorns', {stdin: fileAppend});
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execaSync('unicorns', {stdin: fileAppend});
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await execa('unicorns', {stdin: [fileAppend]});
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execaSync('unicorns', {stdin: [fileAppend]});
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await execa('unicorns', {stdout: fileAppend});
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execaSync('unicorns', {stdout: fileAppend});
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await execa('unicorns', {stdout: [fileAppend]});
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execaSync('unicorns', {stdout: [fileAppend]});
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await execa('unicorns', {stderr: fileAppend});
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execaSync('unicorns', {stderr: fileAppend});
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await execa('unicorns', {stderr: [fileAppend]});
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execaSync('unicorns', {stderr: [fileAppend]});
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expectError(await execa('unicorns', {stdio: fileAppend}));
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expectError(execaSync('unicorns', {stdio: fileAppend}));
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await execa('unicorns', {stdio: ['pipe', 'pipe', 'pipe', fileAppend]});
32+
execaSync('unicorns', {stdio: ['pipe', 'pipe', 'pipe', fileAppend]});
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await execa('unicorns', {stdio: ['pipe', 'pipe', 'pipe', [fileAppend]]});
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execaSync('unicorns', {stdio: ['pipe', 'pipe', 'pipe', [fileAppend]]});
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expectAssignable<StdinOption>(fileAppend);
37+
expectAssignable<StdinSyncOption>(fileAppend);
38+
expectAssignable<StdinOption>([fileAppend]);
39+
expectAssignable<StdinSyncOption>([fileAppend]);
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41+
expectAssignable<StdoutStderrOption>(fileAppend);
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expectAssignable<StdoutStderrSyncOption>(fileAppend);
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expectAssignable<StdoutStderrOption>([fileAppend]);
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expectAssignable<StdoutStderrSyncOption>([fileAppend]);

‎test/stdio/file-path-main.js‎

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@@ -158,3 +158,39 @@ const testInputFileHanging = async (t, mapFilePath) => {
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159159
test('Passing an input file path when subprocess exits does not make promise hang', testInputFileHanging, getAbsolutePath);
160160
test('Passing an input file URL when subprocess exits does not make promise hang', testInputFileHanging, pathToFileURL);
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162+
const testOverwriteFile = async (t, fdNumber, execaMethod, append) => {
163+
const filePath = tempfile();
164+
await writeFile(filePath, '.');
165+
await execaMethod('noop-fd.js', [`${fdNumber}`, foobarString], getStdio(fdNumber, {file: filePath, append}));
166+
t.is(await readFile(filePath, 'utf8'), foobarString);
167+
await rm(filePath);
168+
};
169+
170+
test('Overwrite by default to stdout', testOverwriteFile, 1, execa, undefined);
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test('Overwrite by default to stderr', testOverwriteFile, 2, execa, undefined);
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test('Overwrite by default to stdio[*]', testOverwriteFile, 3, execa, undefined);
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test('Overwrite by default to stdout - sync', testOverwriteFile, 1, execaSync, undefined);
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test('Overwrite by default to stderr - sync', testOverwriteFile, 2, execaSync, undefined);
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test('Overwrite by default to stdio[*] - sync', testOverwriteFile, 3, execaSync, undefined);
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test('Overwrite with append false to stdout', testOverwriteFile, 1, execa, false);
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test('Overwrite with append false to stderr', testOverwriteFile, 2, execa, false);
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test('Overwrite with append false to stdio[*]', testOverwriteFile, 3, execa, false);
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test('Overwrite with append false to stdout - sync', testOverwriteFile, 1, execaSync, false);
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test('Overwrite with append false to stderr - sync', testOverwriteFile, 2, execaSync, false);
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test('Overwrite with append false to stdio[*] - sync', testOverwriteFile, 3, execaSync, false);
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183+
const testAppendFile = async (t, fdNumber, execaMethod) => {
184+
const filePath = tempfile();
185+
await writeFile(filePath, '.');
186+
await execaMethod('noop-fd.js', [`${fdNumber}`, foobarString], getStdio(fdNumber, {file: filePath, append: true}));
187+
t.is(await readFile(filePath, 'utf8'), `.${foobarString}`);
188+
await rm(filePath);
189+
};
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191+
test('Can append to stdout', testAppendFile, 1, execa);
192+
test('Can append to stderr', testAppendFile, 2, execa);
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test('Can append to stdio[*]', testAppendFile, 3, execa);
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test('Can append to stdout - sync', testAppendFile, 1, execaSync);
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test('Can append to stderr - sync', testAppendFile, 2, execaSync);
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test('Can append to stdio[*] - sync', testAppendFile, 3, execaSync);

‎types/stdio/type.d.ts‎

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@@ -49,7 +49,7 @@ type CommonStdioOption<
4949
> =
5050
| SimpleStdioOption<IsSync, IsExtra, IsArray>
5151
| URL
52-
| {readonly file: string}
52+
| {readonly file: string; readonly append?: boolean}
5353
| GeneratorTransform<IsSync>
5454
| GeneratorTransformFull<IsSync>
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| Unless<And<Not<IsSync>, IsArray>, 3 | 4 | 5 | 6 | 7 | 8 | 9>

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