Acid Coder articles - 54 total
Stop using Eslint and Prettier, use Biomejs instead! End Bike Shedding!
Eslint and Prettier are frustrating to configure, they also run slowly learn how to setup biomejs in...
TS-Hajime: Effortlessly Bootstrap TypeScript NPM Libraries
I made a library that can easily bootstrap your TypeScript library with better DX tools. It focuses...
JS being weird again: forcibly convert synchronous statement to asynchronous with async function
Today I came across a tweet: https://twitter.com/BenLesh/status/1717272722193965511 I was...
Typescript Flatten Object Type
type ToPaths<T, P extends string = ''> = T extends Record<number, unknown> ? { ...
Typescript Nominal Type: The Right Way
In case you don't know what RighFminal typing Typescript is a structural typing language, but it is...
Typescript Type Level Custom Error Message For Utility Types
In the previous article, we have learned how to create custom type level error message for our...
Typescript Type Level Custom Error Message, Move Runtime Error to Compile time Error!
Do you want a more descriptive error message rather than usual type A cannot assign to type B? for...
Function: The Savior of Scope. The Story Of Immutability And Declarative.
You likely heard of the term Functional Programming, that it is declarative, immutable, pure...
Typescript WTF Moment 12: Beware of Object Literal Unions
type ABC = { A: number, B: number } | { C: number } const abc: ABC = { A: 1, B: 2, C: 3 } // no...
Write Declarative, Immutable and Flattened Code by Combining Promise and Async Await. The Great Escape From The 4 Hells
(Note: Promise here refer to Promise Chain) Try to google "mix promise and await" , the first two...
Translate Speech Into Japanese (open source web app)
This web application translates speech into Japanese speech, try it at...
0 command SSH for Dummy using Bitvise Client
download bitvise client https://www.bitvise.com/ssh-client-download -setup your login credential...
Typescript Loop Tuple With Length > 1000
We cannot recurse tuple with more than 1000 length due to TS limitation In this example we try to...
Typescript WTF Moments 11: Function Unions: any Param Is Not any
observe the code below type A = ((v: true) => void) | ((v: false) => void) const abc: A =...
![Typescript WTF Moments 10: The Special Case: T[] extends B[]](https://media2.dev.to/dynamic/image/width=1000,height=500,fit=cover,gravity=auto,format=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fbbb572plt3lelfrq4ytv.png)
Typescript WTF Moments 10: The Special Case: T[] extends B[]
observe the below example: type A = boolean; type B = string; type C<T extends B> =...
Typescript WTF Moments 9: Evolving Empty Array Type
const a = false || [] // ^? const b = [] // ^? function c() { // ^? return [] } const...
Typescript Why You Should Avoid Explicit Function Generics If Possible
There are few reasons, the obvious reason is: optimal developer experience An intelligence type do...
Typescript Recursion: It Is Over 999!
This is a proof of concept post, personally I do not find any use of this, yet Typescript recursion...
Typescript Concat Tuples Type
type ConcatArrays< ACC extends any[][], N extends 1[] = [] > = [...ACC[N['length']],...
Typescript Generate Full Path Type And Get Value Type Of Nested Union Object With Numeric Key
Before TS 4.8, obtaining value type for path A/${number} of { A: Record<number, boolean> } is...
Typescript Single Import Type Equality Check
background: type equality check Typescript power users often find themselves in the need of type...
Introducing FireSageJS, Ultimate Type Safety for Firebase Realtime Database
I made a library that solves Firebase Realtime Database typing problems. It is the sister project of...
Typescript WTF Moments 8: Type Level Equality Not Working With Intersection
export type IsSame<T, U> = (<G>() => G extends T ? 1 : 2) extends < G >()...
Typescript WTF Moments 7: Boolean can extends Record<infer X,unknown>
type o = boolean extends Record<infer X, unknown> ? X : false // valueOf // ...
Typescript Greater Equal Or Lesser
type level numeric comparator export type CreateArrayWithLengthX< LENGTH extends number, ...
Typescript WTF Moments 6: Non Collapsing Object Unions
Object unions of same type do not collapse type a = 1 | 1 // 1, collapsed // ^? type b = { a:1...
Typescript WTF Moments 5: const a = 'a' is not equal to const a = 'a' as const and const a:'a'='a'
normally we can skip type annotation because we know that typescript will infer the type for us but...
Typescript WTF Moments 4: never extends `${infer P}` yield different result than never extends `${infer P}/`
type a = never extends `${infer P}` ? P : 1 // never // ^? type b = never extends `${infer P}/` ?...
Typescript When You Should Mix Type Alias And Interface
let say you want to convert number types to undefined given arbitrary object literal type, so here is...
Typescript WTF Moments 3: Type of Key is `string` if Key is Template Literal `a/${string}`
const a = 'a' const obj = { [a]:1 } // {a:1} const b = 'b/a' as `b/${string}` const obj2 = { [b]:1...