'use strict';
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const aliases = ['stdin', 'stdout', 'stderr'];
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const hasAlias = options => aliases.some(alias => options[alias] !== undefined);
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const normalizeStdio = options => {
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if (!options) {
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return;
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}
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const {stdio} = options;
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if (stdio === undefined) {
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return aliases.map(alias => options[alias]);
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}
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if (hasAlias(options)) {
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throw new Error(`It's not possible to provide \`stdio\` in combination with one of ${aliases.map(alias => `\`${alias}\``).join(', ')}`);
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}
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if (typeof stdio === 'string') {
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return stdio;
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}
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if (!Array.isArray(stdio)) {
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throw new TypeError(`Expected \`stdio\` to be of type \`string\` or \`Array\`, got \`${typeof stdio}\``);
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}
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const length = Math.max(stdio.length, aliases.length);
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return Array.from({length}, (value, index) => stdio[index]);
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};
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module.exports = normalizeStdio;
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// `ipc` is pushed unless it is already present
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module.exports.node = options => {
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const stdio = normalizeStdio(options);
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if (stdio === 'ipc') {
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return 'ipc';
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}
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if (stdio === undefined || typeof stdio === 'string') {
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return [stdio, stdio, stdio, 'ipc'];
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}
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if (stdio.includes('ipc')) {
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return stdio;
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}
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return [...stdio, 'ipc'];
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};
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