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'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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