.

qwen/nodejs/node_modules/execa/lib/stdio.js

@@ -0,0 +1,52 @@
+'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'];
+};