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express-server/node_modules/execa/lib/errname.js

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+'use strict';
+// The Node team wants to deprecate `process.bind(...)`.
+//   https://github.com/nodejs/node/pull/2768
+//
+// However, we need the 'uv' binding for errname support.
+// This is a defensive wrapper around it so `execa` will not fail entirely if it stops working someday.
+//
+// If this ever stops working. See: https://github.com/sindresorhus/execa/issues/31#issuecomment-215939939 for another possible solution.
+let uv;
+
+try {
+	uv = process.binding('uv');
+
+	if (typeof uv.errname !== 'function') {
+		throw new TypeError('uv.errname is not a function');
+	}
+} catch (err) {
+	console.error('execa/lib/errname: unable to establish process.binding(\'uv\')', err);
+	uv = null;
+}
+
+function errname(uv, code) {
+	if (uv) {
+		return uv.errname(code);
+	}
+
+	if (!(code < 0)) {
+		throw new Error('err >= 0');
+	}
+
+	return `Unknown system error ${code}`;
+}
+
+module.exports = code => errname(uv, code);
+
+// Used for testing the fallback behavior
+module.exports.__test__ = errname;