As explained in #2548, the following code is not correct when useDefineForClassFields: false, which is the default for targets before ES2021.

const x = 1
class C {
    p = x
    constructor(x: string) { }
}

However, when useDefineForClassFields: true, there shouldn't be an error here.

Expected: No error 2301 on private p = x, and p: number
Actual: Error on private p = x and p: any