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21 lines
659 B
TypeScript
21 lines
659 B
TypeScript
import net, { AddressInfo } from "net"
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import logger from "./logger"
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// todo: check https://github.com/http-party/node-portfinder ?
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export async function getFreePort(): Promise<number> {
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logger.debug("Lookup new free port..");
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return new Promise((resolve, reject) => {
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const server = net.createServer().unref().listen({ port: 0 });
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server.on("listening", () => {
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const port = (server.address() as AddressInfo).port
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server.close(() => resolve(port));
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logger.debug(`New port found: ${port}`);
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});
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server.on("error", error => {
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logger.error(`Can't resolve new port: "${error}"`);
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reject(error);
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});
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})
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}
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