typeof and lookup type in typescript
Rubin
Posted on May 2, 2022
- The
typeofkey can be used to extract type from an existing data
const user = {
name: "Rubin",
age: 15,
address: "Kathmandu"
}
type UserType = typeof user // {name: string,age:number,address: string}
- Look up types on the other hand are used to extract a portion from a complex type and create a new type
type requestType = {
payload: {
name: string,
user: number,
roles: {
edit: boolean,
create: boolean,
read: boolean
}
},
params: {
id: number,
type: string
}
}
// if we want to use type of params as a type then
type Params = requestType["params"] // {id: number,type: string }
type Roles = requestType["payload"]["roles"] // roles: {edit: boolean,create: boolean,read: boolean}
💖 💪 🙅 🚩
Rubin
Posted on May 2, 2022
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