This article is about a mistake when using the callback parameter of the socket.write method in Node.js.

1declare class Socket extends EventEmitter {
2
3    write(buffer: Uint8Array | string, cb?: (err?: Error) => void): boolean;
4}

Recently, I developed a simple image tools and implemented some features using OpenCV, in NodeJS.

Here is my experience of using OpenCV in NodeJS…

@litert/redis is a Redis client library developed entirely in TypeScript, for NodeJS.

All asynchronous operations are based on Promise, and it supports transactions and messaging.

Features

• Support read/write separation.
• Support pipeline.
• Support multi and exec.
• Support subscribe and publish.

Installation

1npm install @litert/redis@^3.0.3

v3.0.3 CHANGES

Versions before v3.0.3 are marked as deprecated. Please upgrade to the latest version ASAP.

• build(deps-dev): bump braces from 3.0.2 to 3.0.3 by @dependabot in https://github.com/litert/redis.js/pull/10
• fix(command): return keys in HMGET command correctly by @fenying in https://github.com/litert/redis.js/pull/11
• fix(protocol): decode “*-1” correctly by @fenying in https://github.com/litert/redis.js/pull/12
• Feat blmove command by @yunbookf in https://github.com/litert/redis.js/pull/13

Contributors

• @yunbookf #13

@litert/televoke is a RPC library for NodeJS, written in TypeScript.

Installation

1npm install @litert/televoke@^1.1.0

v1.1.0 CHANGELOG

• feat(protocol): added experimental supports for transports between worker thread.

  You can run Televoke servers in main thread or worker threads now.

• feat(protocol): added feature flag properties for channel objects.

  Now you can detect whether the server supports push messages and binary stream transport.

• fix(protocol): simplified the ITransporter.end method.

• fix(decoder): should decode protocol error as special error.

• fix(protocol): put protocol-error code in server_internal_server data.

The buffer-based encoding utility method for node.js.

Following types of encodings are supported:

Encoding urlencode

This is a real urlencode implement, it will escape all bytes as %xx format, excepting A-Z, a-z and 0-9. This is a binary-safe encoding.

Binary-safe means it could work with binary data perfectly, without gibberish. And it’s all the same below.

Encoding uri

This is a simple reference of method encodeURIComponent, so it works as method encodeURIComponent does. And it’s not a binary-safe encoding.

Encoding strict_uri

This is based on uri, but all special chars including "-", ".", "_", "!", "*", "(", ")", "~", "'" will be escaped. However, it’s still not a binary-safe encoding.

NOTE: The data of strict_uri encoding, could be simply decoded by function decodeURIComponent.

Encoding base64url

This is based on base64, while charactors "=", "+", "/" will be replaced with URL-safe charactors. This is a binary-safe encoding.

Encoding base62x

This is a variation of base64. And it is a binary-safe encoding.

Installation

1npm install @litert/encodings@^2.3.0

v2.3.0 CHANGELOG

• config(deps): updated dependencies.
• fix(encoding): fixed decoding of the urlencode.
• build(test): added test cases.
• build(project): upgraded the minimum version of Node.js to v14.