[TypeScript] as const, force immutability for Object type

Posted 2021-03-07 answer1215

Unlike javascript‘s const variable declarations, TypeScript allows you to create fully immutable types. In this lesson, we learn how to create immutable types in TypeScript with the help of as const

 

const user = {
    name: ‘xxx‘,
    education: {
        degree: ‘MSc‘
    }
} as const
const users = [
    ‘a‘,
    ‘b‘
] as const
user.education.degree = "BSc"
users.push(‘c‘)