.-.-.-.-.-

'use strict';
const aliases = ['stdin', 'stdout', 'stderr'];

const hasAlias = options => aliases.some(alias => options[alias] !== undefined);

const normalizeStdio = options => {
	if (!options) {
		return;
	}

const {stdio} = options;

if (stdio === undefined) {
		return aliases.map(alias => options[alias]);
	}

if (hasAlias(options)) {
		throw new Error(`It's not possible to provide \`stdio\` in combination with one of ${aliases.map(alias => `\`${alias}\``).join(', ')}`);
	}

if (typeof stdio === 'string') {
		return stdio;
	}

if (!Array.isArray(stdio)) {
		throw new TypeError(`Expected \`stdio\` to be of type \`string\` or \`Array\`, got \`${typeof stdio}\``);
	}

const length = Math.max(stdio.length, aliases.length);
	return Array.from({length}, (value, index) => stdio[index]);
};

module.exports = normalizeStdio;

// `ipc` is pushed unless it is already present
module.exports.node = options => {
	const stdio = normalizeStdio(options);

if (stdio === 'ipc') {
		return 'ipc';
	}

if (stdio === undefined || typeof stdio === 'string') {
		return [stdio, stdio, stdio, 'ipc'];
	}

if (stdio.includes('ipc')) {
		return stdio;
	}

return [...stdio, 'ipc'];
};

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