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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 ,
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ExecaReturnBase < StdoutErrorType > {
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/ * *
Error message when the child process failed to run . In addition to the underlying error message , it also contains some information related to why the child process errored .
The child process stderr then stdout are appended to the end , separated with newlines and not interleaved .
* /
message : string ;
/ * *
This is the same as the ` message ` property except it does not include the child process stdout / stderr .
* /
shortMessage : string ;
/ * *
Original error message . This is the same as the ` message ` property except it includes neither the child process stdout / stderr nor some additional information added by Execa .
This is ` undefined ` unless the child process exited due to an ` error ` event or a timeout .
* /
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 > {
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/ * *
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 ;
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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`.
* /
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kill ( signal? : string , options? : KillOptions ) : void ;
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/ * *
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 ;
}
type ExecaChildProcess < StdoutErrorType = string > = ChildProcess &
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ExecaChildPromise < StdoutErrorType > &
Promise < ExecaReturnValue < StdoutErrorType > > ;
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}
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 = require ( 'execa' ) ;
( async ( ) = > {
const { stdout } = await execa ( 'echo' , [ 'unicorns' ] ) ;
console . log ( stdout ) ;
//=> 'unicorns'
// Cancelling a spawned process
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const subprocess = execa ( 'node' ) ;
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setTimeout ( ( ) = > {
subprocess . cancel ( )
} , 1000 ) ;
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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 <
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Buffer
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> ;
/ * *
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 = require ( '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 ;