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exec-prom.js
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exec-prom.js
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// @flow
/**
* A simple promisified version of child_process.exec, so we can `await` it
*/
const {spawn} = require('child_process');
const execProm = (
command /*: string*/,
{rejectOnError, ...options} /*: {rejectOnError: boolean} & mixed */ = {},
) /*: Promise<{err: ?number, stdout: string, stderr: string}>*/ =>
new Promise((res, rej) => {
const proc = spawn(
command,
// $FlowFixMe
{...options, shell: true},
);
let stdout = '';
let stderr = '';
proc.stdout.setEncoding('utf8');
proc.stderr.setEncoding('utf8');
proc.stdout.on('data', (data /*: string*/) => (stdout += data));
proc.stderr.on('data', (data /*: string*/) => (stderr += data));
proc.on('close', (code /*: number*/) => {
if (code !== 0 && rejectOnError) {
rej(new Error(`Exited with non-zero error code: ${code}`));
} else {
res({
err: code === 0 ? null : code,
stdout,
stderr,
});
}
});
});
module.exports = execProm;