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/// <reference types="node"/>
import {ChildProcess} from 'child_process';
import {Stream, Readable as ReadableStream} from 'stream';
declare namespace execa {
type StdioOption =
| 'pipe'
| 'ipc'
| 'ignore'
| 'inherit'
| Stream
| number
| undefined;
interface CommonOptions<EncodingType> {
/**
Kill the spawned process when the parent process exits unless either:
- the spawned process is [`detached`](https://nodejs.org/api/child_process.html#child_process_options_detached)
- the parent process is terminated abruptly, for example, with `SIGKILL` as opposed to `SIGTERM` or a normal exit
@default true
*/
readonly cleanup?: boolean;
/**
Prefer locally installed binaries when looking for a binary to execute.
If you `$ npm install foo`, you can then `execa('foo')`.
@default false
*/
readonly preferLocal?: boolean;
/**
Preferred path to find locally installed binaries in (use with `preferLocal`).
@default process.cwd()
*/
readonly localDir?: string;
/**
Path to the Node.js executable to use in child processes.
This can be either an absolute path or a path relative to the `cwd` option.
Requires `preferLocal` to be `true`.
For example, this can be used together with [`get-node`](https://github.com/ehmicky/get-node) to run a specific Node.js version in a child process.
@default process.execPath
*/
readonly execPath?: string;
/**
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.
@default true
*/
readonly buffer?: boolean;
/**
Same options as [`stdio`](https://nodejs.org/dist/latest-v6.x/docs/api/child_process.html#child_process_options_stdio).
@default 'pipe'
*/
readonly stdin?: StdioOption;
/**
Same options as [`stdio`](https://nodejs.org/dist/latest-v6.x/docs/api/child_process.html#child_process_options_stdio).
@default 'pipe'
*/
readonly stdout?: StdioOption;
/**
Same options as [`stdio`](https://nodejs.org/dist/latest-v6.x/docs/api/child_process.html#child_process_options_stdio).
@default 'pipe'
*/
readonly stderr?: StdioOption;
/**
Setting this to `false` resolves the promise with the error instead of rejecting it.
@default true
*/
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.
@default true
*/
readonly stripFinalNewline?: boolean;
/**
Set to `false` if you don't want to extend the environment variables when providing the `env` property.
@default true
*/
readonly extendEnv?: boolean;
/**
Current working directory of the child process.
@default process.cwd()
*/
readonly cwd?: string;
/**
Environment key-value pairs. Extends automatically from `process.env`. Set `extendEnv` to `false` if you don't want this.
@default process.env
*/
readonly env?: NodeJS.ProcessEnv;
/**
Explicitly set the value of `argv[0]` sent to the child process. This will be set to `command` or `file` if not specified.
*/
readonly argv0?: string;
/**
Child's [stdio](https://nodejs.org/api/child_process.html#child_process_options_stdio) configuration.
@default 'pipe'
*/
readonly stdio?: 'pipe' | 'ignore' | 'inherit' | readonly StdioOption[];
/**
Specify the kind of serialization used for sending messages between processes when using the `stdio: 'ipc'` option or `execa.node()`:
- `json`: Uses `JSON.stringify()` and `JSON.parse()`.
- `advanced`: Uses [`v8.serialize()`](https://nodejs.org/api/v8.html#v8_v8_serialize_value)
Requires Node.js `13.2.0` or later.
[More info.](https://nodejs.org/api/child_process.html#child_process_advanced_serialization)
@default 'json'
*/
readonly serialization?: 'json' | 'advanced';
/**
Prepare child to run independently of its parent process. Specific behavior [depends on the platform](https://nodejs.org/api/child_process.html#child_process_options_detached).
@default false
*/
readonly detached?: boolean;
/**
Sets the user identity of the process.
*/
readonly uid?: number;
/**
Sets the group identity of the process.
*/
readonly gid?: number;
/**
If `true`, runs `command` inside of a shell. Uses `/bin/sh` on UNIX and `cmd.exe` on Windows. A different shell can be specified as a string. The shell should understand the `-c` switch on UNIX or `/d /s /c` on Windows.
We recommend against using this option since it is:
- not cross-platform, encouraging shell-specific syntax.
- slower, because of the additional shell interpretation.
- unsafe, potentially allowing command injection.
@default false
*/
readonly shell?: boolean | string;
/**
Specify the character encoding used to decode the `stdout` and `stderr` output. If set to `null`, then `stdout` and `stderr` will be a `Buffer` instead of a string.
@default 'utf8'
*/
readonly encoding?: EncodingType;
/**
If `timeout` is greater than `0`, the parent will send the signal identified by the `killSignal` property (the default is `SIGTERM`) if the child runs longer than `timeout` milliseconds.
@default 0
*/
readonly timeout?: number;
/**
Largest amount of data in bytes allowed on `stdout` or `stderr`. Default: 100 MB.
@default 100_000_000
*/
readonly maxBuffer?: number;
/**
Signal value to be used when the spawned process will be killed.
@default 'SIGTERM'
*/
readonly killSignal?: string | number;
/**
If `true`, no quoting or escaping of arguments is done on Windows. Ignored on other platforms. This is set to `true` automatically when the `shell` option is `true`.
@default false
*/
readonly windowsVerbatimArguments?: boolean;
/**
On Windows, do not create a new console window. Please note this also prevents `CTRL-C` [from working](https://github.com/nodejs/node/issues/29837) on Windows.
@default true
*/
readonly windowsHide?: boolean;
}
interface Options<EncodingType = string> extends CommonOptions<EncodingType> {
/**
Write some input to the `stdin` of your binary.
*/
readonly input?: string | Buffer | ReadableStream;
}
interface SyncOptions<EncodingType = string> extends CommonOptions<EncodingType> {
/**
Write some input to the `stdin` of your binary.
*/
readonly input?: string | Buffer;
}
interface NodeOptions<EncodingType = string> extends Options<EncodingType> {
/**
The Node.js executable to use.
@default process.execPath
*/
readonly nodePath?: string;
/**
List of [CLI options](https://nodejs.org/api/cli.html#cli_options) passed to the Node.js executable.
@default process.execArgv
*/
readonly nodeOptions?: string[];
}
interface ExecaReturnBase<StdoutStderrType> {
/**
The file and arguments that were run.
*/
command: string;
/**
The numeric exit code of the process that was run.
*/
exitCode: number;
/**
The output of the process on stdout.
*/
stdout: StdoutStderrType;
/**
The output of the process on stderr.
*/
stderr: StdoutStderrType;
/**
Whether the process failed to run.
*/
failed: boolean;
/**
Whether the process timed out.
*/
timedOut: boolean;
/**
Whether the process was killed.
*/
killed: boolean;
/**
The name of the signal that was used to terminate the process. For example, `SIGFPE`.
If a signal terminated the process, this property is defined and included in the error message. Otherwise it is `undefined`.
*/
signal?: string;
/**
A human-friendly description of the signal that was used to terminate the process. For example, `Floating point arithmetic error`.
If a signal terminated the process, this property is defined and included in the error message. Otherwise it is `undefined`. It is also `undefined` when the signal is very uncommon which should seldomly happen.
*/
signalDescription?: string;
}
interface ExecaSyncReturnValue<StdoutErrorType = string>
extends ExecaReturnBase<StdoutErrorType> {
}
/**
Result of a child process execution. On success this is a plain object. On failure this is also an `Error` instance.
The child process fails when:
- its exit code is not `0`
- it was killed with a signal
- timing out
- being canceled
- there's not enough memory or there are already too many child processes
*/
interface ExecaReturnValue<StdoutErrorType = string>
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;
/**
Whether the process was canceled.
*/
isCanceled: boolean;
}
interface ExecaSyncError<StdoutErrorType = string>
extends Error,
ExecaReturnBase<StdoutErrorType> {
/**
The error message.
*/
message: string;
/**
Original error message. This is `undefined` unless the child process exited due to an `error` event or a timeout.
The `message` property contains both the `originalMessage` and some additional information added by Execa.
*/
originalMessage?: string;
}
interface ExecaError<StdoutErrorType = string>
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;
/**
Whether the process was canceled.
*/
isCanceled: boolean;
}
interface KillOptions {
/**
Milliseconds to wait for the child process to terminate before sending `SIGKILL`.
Can be disabled with `false`.
@default 5000
*/
forceKillAfterTimeout?: number | false;
}
interface ExecaChildPromise<StdoutErrorType> {
catch<ResultType = never>(
onRejected?: (reason: ExecaError<StdoutErrorType>) => ResultType | PromiseLike<ResultType>
): Promise<ExecaReturnValue<StdoutErrorType> | ResultType>;
/**
Same as the original [`child_process#kill()`](https://nodejs.org/api/child_process.html#child_process_subprocess_kill_signal), except if `signal` is `SIGTERM` (the default value) and the child process is not terminated after 5 seconds, force it by sending `SIGKILL`.
*/
kill(signal?: string, options?: execa.KillOptions): void;
/**
Similar to [`childProcess.kill()`](https://nodejs.org/api/child_process.html#child_process_subprocess_kill_signal). This is preferred when cancelling the child process execution as the error is more descriptive and [`childProcessResult.isCanceled`](#iscanceled) is set to `true`.
*/
cancel(): void;
/**
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` 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;
}
type ExecaChildProcess<StdoutErrorType = string> = ChildProcess &
ExecaChildPromise<StdoutErrorType> &
Promise<ExecaReturnValue<StdoutErrorType>>;
}
declare const execa: {
/**
Execute a file.
Think of this as a mix of `child_process.execFile` and `child_process.spawn`.
@param file - The program/script to execute.
@param arguments - Arguments to pass to `file` on execution.
@returns A [`child_process` instance](https://nodejs.org/api/child_process.html#child_process_class_childprocess), which is enhanced to also be a `Promise` for a result `Object` with `stdout` and `stderr` properties.
@example
```
import execa from 'execa';
(async () => {
const {stdout} = await execa('echo', ['unicorns']);
console.log(stdout);
//=> 'unicorns'
// Cancelling a spawned process
const subprocess = execa('node');
setTimeout(() => { spawned.cancel() }, 1000);
try {
await subprocess;
} catch (error) {
console.log(subprocess.killed); // true
console.log(error.isCanceled); // true
}
})();
// Pipe the child process stdout to the current stdout
execa('echo', ['unicorns']).stdout.pipe(process.stdout);
```
*/
(
file: string,
arguments?: readonly string[],
options?: execa.Options
): execa.ExecaChildProcess;
(
file: string,
arguments?: readonly string[],
options?: execa.Options<null>
): execa.ExecaChildProcess<Buffer>;
(file: string, options?: execa.Options): execa.ExecaChildProcess;
(file: string, options?: execa.Options<null>): execa.ExecaChildProcess<
Buffer
>;
/**
Execute a file synchronously.
This method throws an `Error` if the command fails.
@param file - The program/script to execute.
@param arguments - Arguments to pass to `file` on execution.
@returns A result `Object` with `stdout` and `stderr` properties.
*/
sync(
file: string,
arguments?: readonly string[],
options?: execa.SyncOptions
): execa.ExecaSyncReturnValue;
sync(
file: string,
arguments?: readonly string[],
options?: execa.SyncOptions<null>
): execa.ExecaSyncReturnValue<Buffer>;
sync(file: string, options?: execa.SyncOptions): execa.ExecaSyncReturnValue;
sync(
file: string,
options?: execa.SyncOptions<null>
): execa.ExecaSyncReturnValue<Buffer>;
/**
Same as `execa()` except both file and arguments are specified in a single `command` string. For example, `execa('echo', ['unicorns'])` is the same as `execa.command('echo unicorns')`.
If the file or an argument contains spaces, they must be escaped with backslashes. This matters especially if `command` is not a constant but a variable, for example with `__dirname` or `process.cwd()`. Except for spaces, no escaping/quoting is needed.
The `shell` option must be used if the `command` uses shell-specific features, as opposed to being a simple `file` followed by its `arguments`.
@param command - The program/script to execute and its arguments.
@returns A [`child_process` instance](https://nodejs.org/api/child_process.html#child_process_class_childprocess), which is enhanced to also be a `Promise` for a result `Object` with `stdout` and `stderr` properties.
@example
```
import execa from 'execa';
(async () => {
const {stdout} = await execa.command('echo unicorns');
console.log(stdout);
//=> 'unicorns'
})();
```
*/
command(command: string, options?: execa.Options): execa.ExecaChildProcess;
command(command: string, options?: execa.Options<null>): execa.ExecaChildProcess<Buffer>;
/**
Same as `execa.command()` but synchronous.
@param command - The program/script to execute and its arguments.
@returns A result `Object` with `stdout` and `stderr` properties.
*/
commandSync(command: string, options?: execa.SyncOptions): execa.ExecaSyncReturnValue;
commandSync(command: string, options?: execa.SyncOptions<null>): execa.ExecaSyncReturnValue<Buffer>;
/**
Execute a Node.js script as a child process.
Same as `execa('node', [scriptPath, ...arguments], options)` except (like [`child_process#fork()`](https://nodejs.org/api/child_process.html#child_process_child_process_fork_modulepath_args_options)):
- the current Node version and options are used. This can be overridden using the `nodePath` and `nodeArguments` options.
- the `shell` option cannot be used
- an extra channel [`ipc`](https://nodejs.org/api/child_process.html#child_process_options_stdio) is passed to [`stdio`](#stdio)
@param scriptPath - Node.js script to execute.
@param arguments - Arguments to pass to `scriptPath` on execution.
@returns A [`child_process` instance](https://nodejs.org/api/child_process.html#child_process_class_childprocess), which is enhanced to also be a `Promise` for a result `Object` with `stdout` and `stderr` properties.
*/
node(
scriptPath: string,
arguments?: readonly string[],
options?: execa.NodeOptions
): execa.ExecaChildProcess;
node(
scriptPath: string,
arguments?: readonly string[],
options?: execa.Options<null>
): execa.ExecaChildProcess<Buffer>;
node(scriptPath: string, options?: execa.Options): execa.ExecaChildProcess;
node(scriptPath: string, options?: execa.Options<null>): execa.ExecaChildProcess<Buffer>;
};
export = execa;