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lib
stdio.js
'use strict'; const alias = ['stdin', 'stdout', 'stderr']; const hasAlias = opts => alias.some(x => Boolean(opts[x])); module.exports = opts => { if (!opts) { return null; } if (opts.stdio && hasAlias(opts)) { throw new Error(`It's not possible to provide \`stdio\` in combination with one of ${alias.map(x => `\`${x}\``).join(', ')}`); } if (typeof opts.stdio === 'string') { return opts.stdio; } const stdio = opts.stdio || []; if (!Array.isArray(stdio)) { throw new TypeError(`Expected \`stdio\` to be of type \`string\` or \`Array\`, got \`${typeof stdio}\``); } const result = []; const len = Math.max(stdio.length, alias.length); for (let i = 0; i < len; i++) { let value = null; if (stdio[i] !== undefined) { value = stdio[i]; } else if (opts[alias[i]] !== undefined) { value = opts[alias[i]]; } result[i] = value; } return result; };
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