detect-port - npm Package Compare versions

Comparing version 2.0.1 to 2.1.0

dist/commonjs/bin/detect-port.js

@@ -9,3 +9,3 @@ #!/usr/bin/env node
 const node_fs_1 = require("node:fs");
-const detect_port_js_1 = __importDefault(require("../detect-port.js"));
+const detect_port_js_1 = require("../detect-port.js");
 const pkgFile = node_path_1.default.join(__dirname, '../../../package.json');
@@ -33,3 +33,3 @@ const pkg = JSON.parse((0, node_fs_1.readFileSync)(pkgFile, 'utf-8'));
     const random = Math.floor(9000 + Math.random() * (65535 - 9000));
-    (0, detect_port_js_1.default)(random, (err, port) => {
+    (0, detect_port_js_1.detectPort)(random, (err, port) => {
         if (isVerbose) {
@@ -66,3 +66,3 @@ if (err) {
 else {
-    (0, detect_port_js_1.default)(port, (err, _port) => {
+    (0, detect_port_js_1.detectPort)(port, (err, _port) => {
         if (isVerbose) {
@@ -82,2 +82,2 @@ if (err) {
 }
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dist/commonjs/detect-port.d.ts

@@ -1,3 +0,3 @@
-type DetectPortCallback = (err: Error | null, port?: number) => void;
-interface PortConfig {
+export type DetectPortCallback = (err: Error | null, port?: number) => void;
+export interface PortConfig {
     port?: number | string;
@@ -7,5 +7,7 @@ hostname?: string | undefined;
 }
-export default function detectPort(port?: number | PortConfig | string): Promise<number>;
-export default function detectPort(callback: DetectPortCallback): void;
-export default function detectPort(port: number | PortConfig | string | undefined, callback: DetectPortCallback): void;
-export {};
+export declare class IPAddressNotAvailableError extends Error {
+    constructor(options?: ErrorOptions);
+}
+export declare function detectPort(port?: number | PortConfig | string): Promise<number>;
+export declare function detectPort(callback: DetectPortCallback): void;
+export declare function detectPort(port: number | PortConfig | string | undefined, callback: DetectPortCallback): void;

dist/commonjs/detect-port.js

 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.default = detectPort;
+exports.IPAddressNotAvailableError = void 0;
+exports.detectPort = detectPort;
 const node_net_1 = require("node:net");
@@ -8,2 +9,10 @@ const node_util_1 = require("node:util");
 const debug = (0, node_util_1.debuglog)('detect-port');
+class IPAddressNotAvailableError extends Error {
+    constructor(options) {
+        super('The IP address is not available on this machine', options);
+        this.name = this.constructor.name;
+        Error.captureStackTrace(this, this.constructor);
+    }
+}
+exports.IPAddressNotAvailableError = IPAddressNotAvailableError;
 function detectPort(port, callback) {
@@ -29,86 +38,95 @@ let hostname = '';
     if (typeof callback === 'function') {
-        return tryListen(port, maxPort, hostname, callback);
+        return tryListen(port, maxPort, hostname)
+            .then(port => callback(null, port))
+            .catch(callback);
     }
     // promise
-    return new Promise(resolve => {
-        tryListen(port, maxPort, hostname, (_, realPort) => {
-            resolve(realPort);
-        });
-    });
+    return tryListen(port, maxPort, hostname);
 }
-function tryListen(port, maxPort, hostname, callback) {
-    function handleError() {
-        port++;
-        if (port >= maxPort) {
-            debug('port: %s >= maxPort: %s, give up and use random port', port, maxPort);
-            port = 0;
-            maxPort = 0;
-        }
-        tryListen(port, maxPort, hostname, callback);
+async function handleError(port, maxPort, hostname) {
+    if (port >= maxPort) {
+        debug('port: %s >= maxPort: %s, give up and use random port', port, maxPort);
+        port = 0;
+        maxPort = 0;
     }
+    return await tryListen(port, maxPort, hostname);
+}
+async function tryListen(port, maxPort, hostname) {
     // use user hostname
     if (hostname) {
-        listen(port, hostname, (err, realPort) => {
-            if (err) {
-                if (err.code === 'EADDRNOTAVAIL') {
-                    return callback(new Error('The IP address is not available on this machine'));
-                }
-                return handleError();
+        try {
+            return await listen(port, hostname);
+        }
+        catch (err) {
+            if (err.code === 'EADDRNOTAVAIL') {
+                throw new IPAddressNotAvailableError({ cause: err });
             }
-            callback(null, realPort);
-        });
+            return await handleError(++port, maxPort, hostname);
+        }
     }
-    else {
-        // 1. check null
-        listen(port, void 0, (err, realPort) => {
-            // ignore random listening
-            if (port === 0) {
-                return callback(err, realPort);
-            }
-            if (err) {
-                return handleError();
-            }
-            // 2. check 0.0.0.0
-            listen(port, '0.0.0.0', err => {
-                if (err) {
-                    return handleError();
-                }
-                // 3. check localhost
-                listen(port, 'localhost', err => {
-                    // if localhost refer to the ip that is not unkonwn on the machine, you will see the error EADDRNOTAVAIL
-                    // https://stackoverflow.com/questions/10809740/listen-eaddrnotavail-error-in-node-js
-                    if (err && err.code !== 'EADDRNOTAVAIL') {
-                        return handleError();
-                    }
-                    // 4. check current ip
-                    listen(port, (0, address_1.ip)(), (err, realPort) => {
-                        if (err) {
-                            return handleError();
-                        }
-                        callback(null, realPort);
-                    });
-                });
-            });
-        });
+    // 1. check null / undefined
+    try {
+        await listen(port);
     }
+    catch (err) {
+        // ignore random listening
+        if (port === 0) {
+            throw err;
+        }
+        return await handleError(++port, maxPort, hostname);
+    }
+    // 2. check 0.0.0.0
+    try {
+        await listen(port, '0.0.0.0');
+    }
+    catch (err) {
+        return await handleError(++port, maxPort, hostname);
+    }
+    // 3. check 127.0.0.1
+    try {
+        await listen(port, '127.0.0.1');
+    }
+    catch (err) {
+        return await handleError(++port, maxPort, hostname);
+    }
+    // 4. check localhost
+    try {
+        await listen(port, 'localhost');
+    }
+    catch (err) {
+        // if localhost refer to the ip that is not unknown on the machine, you will see the error EADDRNOTAVAIL
+        // https://stackoverflow.com/questions/10809740/listen-eaddrnotavail-error-in-node-js
+        if (err.code !== 'EADDRNOTAVAIL') {
+            return await handleError(++port, maxPort, hostname);
+        }
+    }
+    // 5. check current ip
+    try {
+        return await listen(port, (0, address_1.ip)());
+    }
+    catch (err) {
+        return await handleError(++port, maxPort, hostname);
+    }
 }
-function listen(port, hostname, callback) {
+function listen(port, hostname) {
     const server = (0, node_net_1.createServer)();
-    server.once('error', err => {
-        debug('listen %s:%s error: %s', hostname, port, err);
-        server.close();
-        if (err.code === 'ENOTFOUND') {
-            debug('ignore dns ENOTFOUND error, get free %s:%s', hostname, port);
-            return callback(null, port);
-        }
-        return callback(err);
+    return new Promise((resolve, reject) => {
+        server.once('error', err => {
+            debug('listen %s:%s error: %s', hostname, port, err);
+            server.close();
+            if (err.code === 'ENOTFOUND') {
+                debug('ignore dns ENOTFOUND error, get free %s:%s', hostname, port);
+                return resolve(port);
+            }
+            return reject(err);
+        });
+        debug('try listen %d on %s', port, hostname);
+        server.listen(port, hostname, () => {
+            port = server.address().port;
+            debug('get free %s:%s', hostname, port);
+            server.close();
+            return resolve(port);
+        });
     });
-    debug('try listen %d on %s', port, hostname);
-    server.listen(port, hostname, () => {
-        port = server.address().port;
-        debug('get free %s:%s', hostname, port);
-        server.close();
-        return callback(null, port);
-    });
 }
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+//# 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dist/commonjs/index.d.ts

@@ -1,4 +0,5 @@
-import detectPort from './detect-port.js';
+import { detectPort } from './detect-port.js';
 export default detectPort;
-export { detectPort };
+export * from './detect-port.js';
+export declare const detect: typeof detectPort;
 export * from './wait-port.js';

dist/commonjs/index.js

@@ -16,11 +16,10 @@ "use strict";
 };
-var __importDefault = (this && this.__importDefault) || function (mod) {
-    return (mod && mod.__esModule) ? mod : { "default": mod };
-};
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.detectPort = void 0;
-const detect_port_js_1 = __importDefault(require("./detect-port.js"));
-exports.detectPort = detect_port_js_1.default;
-exports.default = detect_port_js_1.default;
+exports.detect = void 0;
+const detect_port_js_1 = require("./detect-port.js");
+exports.default = detect_port_js_1.detectPort;
+__exportStar(require("./detect-port.js"), exports);
+// keep alias detectPort to detect
+exports.detect = detect_port_js_1.detectPort;
 __exportStar(require("./wait-port.js"), exports);
-//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoiaW5kZXguanMiLCJzb3VyY2VSb290IjoiIiwic291cmNlcyI6WyIuLi8uLi9zcmMvaW5kZXgudHMiXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6Ijs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7QUFBQSxzRUFBMEM7QUFJakMscUJBSkYsd0JBQVUsQ0FJRTtBQUZuQixrQkFBZSx3QkFBVSxDQUFDO0FBRzFCLGlEQUErQiJ9
+//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoiaW5kZXguanMiLCJzb3VyY2VSb290IjoiIiwic291cmNlcyI6WyIuLi8uLi9zcmMvaW5kZXgudHMiXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6Ijs7Ozs7Ozs7Ozs7Ozs7Ozs7QUFBQSxxREFBOEM7QUFFOUMsa0JBQWUsMkJBQVUsQ0FBQztBQUUxQixtREFBaUM7QUFDakMsa0NBQWtDO0FBQ3JCLFFBQUEsTUFBTSxHQUFHLDJCQUFVLENBQUM7QUFFakMsaURBQStCIn0=

dist/commonjs/wait-port.js

 "use strict";
-var __importDefault = (this && this.__importDefault) || function (mod) {
-    return (mod && mod.__esModule) ? mod : { "default": mod };
-};
 Object.defineProperty(exports, "__esModule", { value: true });
@@ -9,3 +6,3 @@ exports.WaitPortRetryError = void 0;
 const node_util_1 = require("node:util");
-const detect_port_js_1 = __importDefault(require("./detect-port.js"));
+const detect_port_js_1 = require("./detect-port.js");
 const debug = (0, node_util_1.debuglog)('detect-port:wait-port');
@@ -39,3 +36,3 @@ function sleep(ms) {
         count++;
-        const freePort = await (0, detect_port_js_1.default)(port);
+        const freePort = await (0, detect_port_js_1.detectPort)(port);
         if (freePort === port) {
@@ -49,2 +46,2 @@ await sleep(retryInterval);
 }
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dist/esm/bin/detect-port.js

 #!/usr/bin/env node
 import path from 'node:path';
 import { readFileSync } from 'node:fs';
-import detectPort from '../detect-port.js';
+import { detectPort } from '../detect-port.js';
 const pkgFile = path.join(__dirname, '../../../package.json');
@@ -74,2 +74,2 @@ const pkg = JSON.parse(readFileSync(pkgFile, 'utf-8'));
 }
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dist/esm/detect-port.d.ts

@@ -1,3 +0,3 @@
-type DetectPortCallback = (err: Error | null, port?: number) => void;
-interface PortConfig {
+export type DetectPortCallback = (err: Error | null, port?: number) => void;
+export interface PortConfig {
     port?: number | string;
@@ -7,5 +7,7 @@ hostname?: string | undefined;
 }
-export default function detectPort(port?: number | PortConfig | string): Promise<number>;
-export default function detectPort(callback: DetectPortCallback): void;
-export default function detectPort(port: number | PortConfig | string | undefined, callback: DetectPortCallback): void;
-export {};
+export declare class IPAddressNotAvailableError extends Error {
+    constructor(options?: ErrorOptions);
+}
+export declare function detectPort(port?: number | PortConfig | string): Promise<number>;
+export declare function detectPort(callback: DetectPortCallback): void;
+export declare function detectPort(port: number | PortConfig | string | undefined, callback: DetectPortCallback): void;

dist/esm/detect-port.js

@@ -5,3 +5,10 @@ import { createServer } from 'node:net';
 const debug = debuglog('detect-port');
-export default function detectPort(port, callback) {
+export class IPAddressNotAvailableError extends Error {
+    constructor(options) {
+        super('The IP address is not available on this machine', options);
+        this.name = this.constructor.name;
+        Error.captureStackTrace(this, this.constructor);
+    }
+}
+export function detectPort(port, callback) {
     let hostname = '';
@@ -26,86 +33,95 @@ if (port && typeof port === 'object') {
     if (typeof callback === 'function') {
-        return tryListen(port, maxPort, hostname, callback);
+        return tryListen(port, maxPort, hostname)
+            .then(port => callback(null, port))
+            .catch(callback);
     }
     // promise
-    return new Promise(resolve => {
-        tryListen(port, maxPort, hostname, (_, realPort) => {
-            resolve(realPort);
-        });
-    });
+    return tryListen(port, maxPort, hostname);
 }
-function tryListen(port, maxPort, hostname, callback) {
-    function handleError() {
-        port++;
-        if (port >= maxPort) {
-            debug('port: %s >= maxPort: %s, give up and use random port', port, maxPort);
-            port = 0;
-            maxPort = 0;
-        }
-        tryListen(port, maxPort, hostname, callback);
+async function handleError(port, maxPort, hostname) {
+    if (port >= maxPort) {
+        debug('port: %s >= maxPort: %s, give up and use random port', port, maxPort);
+        port = 0;
+        maxPort = 0;
     }
+    return await tryListen(port, maxPort, hostname);
+}
+async function tryListen(port, maxPort, hostname) {
     // use user hostname
     if (hostname) {
-        listen(port, hostname, (err, realPort) => {
-            if (err) {
-                if (err.code === 'EADDRNOTAVAIL') {
-                    return callback(new Error('The IP address is not available on this machine'));
-                }
-                return handleError();
+        try {
+            return await listen(port, hostname);
+        }
+        catch (err) {
+            if (err.code === 'EADDRNOTAVAIL') {
+                throw new IPAddressNotAvailableError({ cause: err });
             }
-            callback(null, realPort);
-        });
+            return await handleError(++port, maxPort, hostname);
+        }
     }
-    else {
-        // 1. check null
-        listen(port, void 0, (err, realPort) => {
-            // ignore random listening
-            if (port === 0) {
-                return callback(err, realPort);
-            }
-            if (err) {
-                return handleError();
-            }
-            // 2. check 0.0.0.0
-            listen(port, '0.0.0.0', err => {
-                if (err) {
-                    return handleError();
-                }
-                // 3. check localhost
-                listen(port, 'localhost', err => {
-                    // if localhost refer to the ip that is not unkonwn on the machine, you will see the error EADDRNOTAVAIL
-                    // https://stackoverflow.com/questions/10809740/listen-eaddrnotavail-error-in-node-js
-                    if (err && err.code !== 'EADDRNOTAVAIL') {
-                        return handleError();
-                    }
-                    // 4. check current ip
-                    listen(port, ip(), (err, realPort) => {
-                        if (err) {
-                            return handleError();
-                        }
-                        callback(null, realPort);
-                    });
-                });
-            });
-        });
+    // 1. check null / undefined
+    try {
+        await listen(port);
     }
+    catch (err) {
+        // ignore random listening
+        if (port === 0) {
+            throw err;
+        }
+        return await handleError(++port, maxPort, hostname);
+    }
+    // 2. check 0.0.0.0
+    try {
+        await listen(port, '0.0.0.0');
+    }
+    catch (err) {
+        return await handleError(++port, maxPort, hostname);
+    }
+    // 3. check 127.0.0.1
+    try {
+        await listen(port, '127.0.0.1');
+    }
+    catch (err) {
+        return await handleError(++port, maxPort, hostname);
+    }
+    // 4. check localhost
+    try {
+        await listen(port, 'localhost');
+    }
+    catch (err) {
+        // if localhost refer to the ip that is not unknown on the machine, you will see the error EADDRNOTAVAIL
+        // https://stackoverflow.com/questions/10809740/listen-eaddrnotavail-error-in-node-js
+        if (err.code !== 'EADDRNOTAVAIL') {
+            return await handleError(++port, maxPort, hostname);
+        }
+    }
+    // 5. check current ip
+    try {
+        return await listen(port, ip());
+    }
+    catch (err) {
+        return await handleError(++port, maxPort, hostname);
+    }
 }
-function listen(port, hostname, callback) {
+function listen(port, hostname) {
     const server = createServer();
-    server.once('error', err => {
-        debug('listen %s:%s error: %s', hostname, port, err);
-        server.close();
-        if (err.code === 'ENOTFOUND') {
-            debug('ignore dns ENOTFOUND error, get free %s:%s', hostname, port);
-            return callback(null, port);
-        }
-        return callback(err);
+    return new Promise((resolve, reject) => {
+        server.once('error', err => {
+            debug('listen %s:%s error: %s', hostname, port, err);
+            server.close();
+            if (err.code === 'ENOTFOUND') {
+                debug('ignore dns ENOTFOUND error, get free %s:%s', hostname, port);
+                return resolve(port);
+            }
+            return reject(err);
+        });
+        debug('try listen %d on %s', port, hostname);
+        server.listen(port, hostname, () => {
+            port = server.address().port;
+            debug('get free %s:%s', hostname, port);
+            server.close();
+            return resolve(port);
+        });
     });
-    debug('try listen %d on %s', port, hostname);
-    server.listen(port, hostname, () => {
-        port = server.address().port;
-        debug('get free %s:%s', hostname, port);
-        server.close();
-        return callback(null, port);
-    });
 }
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+//# 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dist/esm/index.d.ts

@@ -1,4 +0,5 @@
-import detectPort from './detect-port.js';
+import { detectPort } from './detect-port.js';
 export default detectPort;
-export { detectPort };
+export * from './detect-port.js';
+export declare const detect: typeof detectPort;
 export * from './wait-port.js';

dist/esm/index.js

@@ -1,5 +0,7 @@
-import detectPort from './detect-port.js';
+import { detectPort } from './detect-port.js';
 export default detectPort;
-export { detectPort };
+export * from './detect-port.js';
+// keep alias detectPort to detect
+export const detect = detectPort;
 export * from './wait-port.js';
-//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoiaW5kZXguanMiLCJzb3VyY2VSb290IjoiIiwic291cmNlcyI6WyIuLi8uLi9zcmMvaW5kZXgudHMiXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6IkFBQUEsT0FBTyxVQUFVLE1BQU0sa0JBQWtCLENBQUM7QUFFMUMsZUFBZSxVQUFVLENBQUM7QUFFMUIsT0FBTyxFQUFFLFVBQVUsRUFBRSxDQUFDO0FBQ3RCLGNBQWMsZ0JBQWdCLENBQUMifQ==
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dist/esm/wait-port.js

 import { debuglog } from 'node:util';
-import detectPort from './detect-port.js';
+import { detectPort } from './detect-port.js';
 const debug = debuglog('detect-port:wait-port');
@@ -39,2 +39,2 @@ function sleep(ms) {
 }
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dist/package.json

 {
   "name": "detect-port",
-  "version": "2.0.1"
+  "version": "2.1.0"
 }

package.json

 {
   "name": "detect-port",
-  "version": "2.0.1",
+  "version": "2.1.0",
   "description": "Node.js implementation of port detector",
@@ -5,0 +5,0 @@ "keywords": [

README.md

@@ -45,14 +45,13 @@ # detect-port
 
+CommonJS
+
 ```javascript
-const detect = require('detect-port');
-/**
- * use as a promise
- */
+const { detect } = require('detect-port');
 
 detect(port)
-  .then(_port => {
-    if (port == _port) {
+  .then(realPort => {
+    if (port == realPort) {
       console.log(`port: ${port} was not occupied`);
     } else {
-      console.log(`port: ${port} was occupied, try port: ${_port}`);
+      console.log(`port: ${port} was occupied, try port: ${realPort}`);
     }
@@ -63,3 +62,20 @@ })
   });
+```
 
+ESM and TypeScript
+
+```ts
+import { detect } from 'detect-port';
+
+detect(port)
+  .then(realPort => {
+    if (port == realPort) {
+      console.log(`port: ${port} was not occupied`);
+    } else {
+      console.log(`port: ${port} was occupied, try port: ${realPort}`);
+    }
+  })
+  .catch(err => {
+    console.log(err);
+  });
 ```
@@ -66,0 +82,0 @@

src/bin/detect-port.ts

@@ -5,3 +5,3 @@ #!/usr/bin/env node
 import { readFileSync } from 'node:fs';
-import detectPort from '../detect-port.js';
+import { detectPort } from '../detect-port.js';
 
@@ -8,0 +8,0 @@ const pkgFile = path.join(__dirname, '../../../package.json');

src/detect-port.ts

@@ -7,5 +7,5 @@ import { createServer, AddressInfo } from 'node:net';
 
-type DetectPortCallback = (err: Error | null, port?: number) => void;
+export type DetectPortCallback = (err: Error | null, port?: number) => void;
 
-interface PortConfig {
+export interface PortConfig {
   port?: number | string;
@@ -16,6 +16,14 @@ hostname?: string | undefined;
 
-export default function detectPort(port?: number | PortConfig | string): Promise<number>;
-export default function detectPort(callback: DetectPortCallback): void;
-export default function detectPort(port: number | PortConfig | string | undefined, callback: DetectPortCallback): void;
-export default function detectPort(port?: number | string | PortConfig | DetectPortCallback, callback?: DetectPortCallback) {
+export class IPAddressNotAvailableError extends Error {
+  constructor(options?: ErrorOptions) {
+    super('The IP address is not available on this machine', options);
+    this.name = this.constructor.name;
+    Error.captureStackTrace(this, this.constructor);
+  }
+}
+
+export function detectPort(port?: number | PortConfig | string): Promise<number>;
+export function detectPort(callback: DetectPortCallback): void;
+export function detectPort(port: number | PortConfig | string | undefined, callback: DetectPortCallback): void;
+export function detectPort(port?: number | string | PortConfig | DetectPortCallback, callback?: DetectPortCallback) {
   let hostname: string | undefined = '';
@@ -41,97 +49,100 @@
   if (typeof callback === 'function') {
-    return tryListen(port, maxPort, hostname, callback);
+    return tryListen(port, maxPort, hostname)
+      .then(port => callback(null, port))
+      .catch(callback);
   }
   // promise
-  return new Promise(resolve => {
-    tryListen(port as number, maxPort, hostname, (_, realPort) => {
-      resolve(realPort);
-    });
-  });
+  return tryListen(port as number, maxPort, hostname);
 }
 
-function tryListen(port: number, maxPort: number, hostname: string | undefined, callback: DetectPortCallback) {
-  function handleError() {
-    port++;
-    if (port >= maxPort) {
-      debug('port: %s >= maxPort: %s, give up and use random port', port, maxPort);
-      port = 0;
-      maxPort = 0;
-    }
-    tryListen(port, maxPort, hostname, callback);
+async function handleError(port: number, maxPort: number, hostname?: string) {
+  if (port >= maxPort) {
+    debug('port: %s >= maxPort: %s, give up and use random port', port, maxPort);
+    port = 0;
+    maxPort = 0;
   }
+  return await tryListen(port, maxPort, hostname);
+}
 
+async function tryListen(port: number, maxPort: number, hostname?: string): Promise<number> {
   // use user hostname
   if (hostname) {
-    listen(port, hostname, (err, realPort) => {
-      if (err) {
-        if ((err as any).code === 'EADDRNOTAVAIL') {
-          return callback(new Error('The IP address is not available on this machine'));
-        }
-        return handleError();
+    try {
+      return await listen(port, hostname);
+    } catch (err: any) {
+      if (err.code === 'EADDRNOTAVAIL') {
+        throw new IPAddressNotAvailableError({ cause: err });
       }
+      return await handleError(++port, maxPort, hostname);
+    }
+  }
 
-      callback(null, realPort);
-    });
-  } else {
-    // 1. check null
-    listen(port, void 0, (err, realPort) => {
-      // ignore random listening
-      if (port === 0) {
-        return callback(err, realPort);
-      }
+  // 1. check null / undefined
+  try {
+    await listen(port);
+  } catch (err) {
+    // ignore random listening
+    if (port === 0) {
+      throw err;
+    }
+    return await handleError(++port, maxPort, hostname);
+  }
 
-      if (err) {
-        return handleError();
-      }
+  // 2. check 0.0.0.0
+  try {
+    await listen(port, '0.0.0.0');
+  } catch (err) {
+    return await handleError(++port, maxPort, hostname);
+  }
 
-      // 2. check 0.0.0.0
-      listen(port, '0.0.0.0', err => {
-        if (err) {
-          return handleError();
-        }
+  // 3. check 127.0.0.1
+  try {
+    await listen(port, '127.0.0.1');
+  } catch (err) {
+    return await handleError(++port, maxPort, hostname);
+  }
 
-        // 3. check localhost
-        listen(port, 'localhost', err => {
-          // if localhost refer to the ip that is not unkonwn on the machine, you will see the error EADDRNOTAVAIL
-          // https://stackoverflow.com/questions/10809740/listen-eaddrnotavail-error-in-node-js
-          if (err && (err as any).code !== 'EADDRNOTAVAIL') {
-            return handleError();
-          }
+  // 4. check localhost
+  try {
+    await listen(port, 'localhost');
+  } catch (err: any) {
+    // if localhost refer to the ip that is not unknown on the machine, you will see the error EADDRNOTAVAIL
+    // https://stackoverflow.com/questions/10809740/listen-eaddrnotavail-error-in-node-js
+    if (err.code !== 'EADDRNOTAVAIL') {
+      return await handleError(++port, maxPort, hostname);
+    }
+  }
 
-          // 4. check current ip
-          listen(port, ip(), (err, realPort) => {
-            if (err) {
-              return handleError();
-            }
-
-            callback(null, realPort);
-          });
-        });
-      });
-    });
+  // 5. check current ip
+  try {
+    return await listen(port, ip());
+  } catch (err) {
+    return await handleError(++port, maxPort, hostname);
   }
 }
 
-function listen(port: number, hostname: string | undefined, callback: DetectPortCallback) {
+function listen(port: number, hostname?: string) {
   const server = createServer();
 
-  server.once('error', err => {
-    debug('listen %s:%s error: %s', hostname, port, err);
-    server.close();
+  return new Promise<number>((resolve, reject) => {
+    server.once('error', err => {
+      debug('listen %s:%s error: %s', hostname, port, err);
+      server.close();
 
-    if ((err as any).code === 'ENOTFOUND') {
-      debug('ignore dns ENOTFOUND error, get free %s:%s', hostname, port);
-      return callback(null, port);
-    }
+      if ((err as any).code === 'ENOTFOUND') {
+        debug('ignore dns ENOTFOUND error, get free %s:%s', hostname, port);
+        return resolve(port);
+      }
 
-    return callback(err);
-  });
+      return reject(err);
+    });
 
-  debug('try listen %d on %s', port, hostname);
-  server.listen(port, hostname, () => {
-    port = (server.address() as AddressInfo).port;
-    debug('get free %s:%s', hostname, port);
-    server.close();
-    return callback(null, port);
+    debug('try listen %d on %s', port, hostname);
+    server.listen(port, hostname, () => {
+      port = (server.address() as AddressInfo).port;
+      debug('get free %s:%s', hostname, port);
+      server.close();
+      return resolve(port);
+    });
   });
 }

src/index.ts

@@ -1,6 +0,9 @@
-import detectPort from './detect-port.js';
+import { detectPort } from './detect-port.js';
 
 export default detectPort;
 
-export { detectPort };
+export * from './detect-port.js';
+// keep alias detectPort to detect
+export const detect = detectPort;
+
 export * from './wait-port.js';

src/wait-port.ts

 import { debuglog } from 'node:util';
-import detectPort from './detect-port.js';
+import { detectPort } from './detect-port.js';
 
@@ -4,0 +4,0 @@ const debug = debuglog('detect-port:wait-port');

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Improved metrics

Total package byte prevSize

55342

increased by5.22%

Lines of code

815

increased by6.68%

Number of lines in readme file

122

increased by15.09%

No dependency changes