| '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']; |
| }; |