stdio.js•1.16 kB
const aliases = ['stdin', 'stdout', 'stderr'];
const hasAlias = options => aliases.some(alias => options[alias] !== undefined);
export 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]);
};
// `ipc` is pushed unless it is already present
export const normalizeStdioNode = 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'];
};