typescript-lib-enhancer v1.0.13

Enhance TypeScript lib.*.d.ts

Usage

Install and add to tsconfig.json types

{
  "compilerOptions": {
    "types": [
      "typescript-lib-enhancer"
    ]
  }
}

this package includes typed-query-selector/strict to enhance querySelector() & querySelectorAll() & closest()

Features

EnhanceObject.hasOwn to narrow types just like key in obj

declare const value: { a: number } | { b: number }

// before 
if (Object.hasOwn(value, 'a')) {
  // Errot: Property 'a' does not exist on type '{ b: number; }'
  value.a = 12
}

// after
if (Object.hasOwn(value, 'a')) {
  value.a = 12 // OK
  value.b = 12 // Error as expect
} else {
  value.b = 12 // OK
}

TODO

• Object.asign type
• structuredClone no functions allow
• Element.setAttribute allow number as value?
• Object.entries key type
• Array.prototype.reduce & Array.prototype.reduceRight
• Object.keys & Object.entries & Object.values & Object.fromEntries
• Object.isFrozen <T>(o: T): o is Readonly<T>
• Reflect.get
• document.getElementById add generic
• Array.concat concat\<K>(...items: K[]): (T | K)[]

Loose

• parseInt allow number

Add error generic for Promise