In case you don’t know what is nominal typing Typescript is a structural typing language, but it is possible to mimic the behavior of nominal typing language, very closely. We start with the easiest method: type AB = { a:number, b:number, x:never} type BA = { a:number, b:number, y:never} const ab:AB =…

Part 1: Typescript Type Level Custom Error Message, Move Runtime Error to Compile time Error! In the previous article, we have learned how to create custom type level error message for our function In this article, We are going to learn how to create custom type level error message for…the…

Part2: Typescript Type Level Custom Error Message For Utility Types Do you want a more descriptive error message rather than usual type A cannot assign to type B? for example, take this function: function (a, b, c) => {} Requirement: 1. all arguments are number 2. if a is 1, b cannot…

You likely heard of the term Functional Programming, that it is declarative, immutable, pure function(no side effect) and it uses recursion over loop. Immutable, declarative, pure function and recursion, we repeat these words every time we talk about functional programming But why? Today we are going to examine how immutability…

type ABC = { A: number, B: number } | { C: number } const abc: ABC = { A: 1, B: 2, C: 3 } // no error! playground Typescript excess property check allow any property from unions of object literal Solutions Assign type `never` to excess properties and make…

(Note: Promise here refer to Promise Chain) Try to google “mix promise and await” , the first two results tell you not to do so

This web application translates speech into Japanese speech, try it at [voicefu.com](https://voicefu.com/) Techs: 1. Speech to text: Whisper 2. Translation: GPT 3. Japanese Voice Synthesis: Voicevox you can get the source source code here: https://github.com/tylim88/Voicefu Responsive design, you can view it on phone

download bitvise client https://www.bitvise.com/ssh-client-download -setup your login credential using password(we use unbuntu in this example) 1. the server ip address 2. default ssh port is 22 3. username 4. password 5. check the box if you want to store the password 6. save your profile so you can reuse it …

There are few reasons, the obvious reason is: optimal developer experience An intelligence type do the most work for you, it is more automate and you write less code But there is one very important reason: it does not work well with union to understand this, observe the below example: …