TS2339: Property does not exist on type - in CI

You accessed a property the compiler cannot find on the inferred or declared type.

What this error means

Type-checking fails with TS2339 naming the property and the type it is missing from.

src/user.ts(12,18): error TS2339: Property 'email' does not exist on type '{ id: number; }'.

Common causes

How to fix it

Type the value correctly

1. Declare an interface that includes the property
2. Annotate the variable or function return with that type

interface User { id: number; email: string }
const u: User = await getUser()

Narrow a union before access

1. Use a type guard (in, typeof, discriminant) so the branch has the property

if ('email' in u) console.log(u.email)

How to prevent it

• Type external data with explicit interfaces and narrow unions before member access rather than casting.

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