CODEWITHSUNDEEP
typescriptprisma
n1cK
n1cK

Reputation: 368

Get properties of a type

I can't find a way to lookup in runtime whether a certain property exists on a type. Like so (pseudocode)

import { MyType } from '@prisma/client';

MyType.hasProperty("foo") // true/false

MyType.allProperties() // ["foo", "bar", "stuff"]

Does anyone know a good solution? Thank you in advance !

Upvotes: 10

Views: 11613

Answers (1)

Alex Wayne
Alex Wayne

Reputation: 187024

Types don't exist at runtime. But you can still inspect objects that exist at runtime. You can use the in operator to check if an object contains a particular property, and you can use use Object.keys(someObj) to get all keys on an object as an array.

const foo = { a: 123, b: 'bar' }
'a' in foo // true
Object.keys(foo) // ['a', 'b']

What you cannot do is get this info from a type or interface. It must be a real object that exists at runtime.

Upvotes: 7

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