what are intersection type?

omkar garde — Tue, 21 Oct 2025 12:34:49 +0000

intersection type are create a new type by extending exciting types using
& operator

interface type1{...}
interface type2{...}
type type3 = type1 & type2

using & works same way as using extends clause with only difference being
in way they resole conflicts

//these are two interfaces with same property but with incompatible types
interface type1{
  property:string
}
interface type2{
  property:number
}
type3 = type1 & type2

type3 will result in never type because
TypeScript will try to combine the types regardless

interface type2 extends type1{
  property:number
}

here typescript will throw an error because the types are incompatible

what are template literals types and what are template literals?

omkar garde — Tue, 21 Oct 2025 10:38:10 +0000

template literals types in typescript are built upon literal type.

a literal type represent that a variable can hold only one specific string.

a regular which can represent any string value.

let changingString = "Hello World";
changingString = "Goodbye World";
// Because `changingString` can represent any possible string, that
// is how TypeScript describes it in the type system
changingString;

const constantString = "Hello World";
// Because `constantString` can only represent 1 possible string, it
// has a literal type representation
// NOTE: literal types are still string and returned as such
constantString;

template literal or template which are delimited by backtick are used for.

string interpolation
exception function inline in string
tagged template literal which are used to execute custom function

let a = 10;
console.log(`some string ${a}`)
console.log(`some string ${a+10}`)

a template literal is used to print out string to console while
template literal type are used for to represent a specific string value

Forem: omkar garde

what are intersection type?

what are template literals types and what are template literals?