Class properties cannot be initialized within constructor if the property key comes from a static class property (e.g. [Symbol.iterator])

Bug Report

🔎 Search Terms

symbol property constructor 2564

🕗 Version & Regression Information

• This changed between versions 4.6.4 and 4.7.4

⏯ Playground Link

Playground link with relevant code

💻 Code

const standaloneSymbol = Symbol("standalone");

class SymbolClass {
    static readonly staticSymbol = Symbol("static");
}

interface IHaveSymbols {
    [standaloneSymbol]: number;
    [SymbolClass.staticSymbol]: number;
}

class HavePropertyInitializedSymbols implements IHaveSymbols {
    [standaloneSymbol] = 1;
    [SymbolClass.staticSymbol] = 2;
}

class HaveOverriddenSymbols extends HavePropertyInitializedSymbols {
    constructor() {
        super();
        this[standaloneSymbol] = 3;
        this[SymbolClass.staticSymbol] = 4;
    }
}

class HaveConstructorInitializedSymbols implements IHaveSymbols {
    [standaloneSymbol]: number;
    [SymbolClass.staticSymbol]: number;
    constructor() {
        this[standaloneSymbol] = 3;
        this[SymbolClass.staticSymbol] = 4;
    }
}

🙁 Actual behavior

Property '[SymbolClass.staticSymbol]' has no initializer and is not definitely assigned in the constructor.(2564)
(property) SymbolClass.staticSymbol: typeof SymbolClass.staticSymbol

It's wrong because the property is definitely assigned in the constructor

🙂 Expected behavior

No error, because the property is definitely assigned in the constructor