typescript - Eslint flags as not defined class member that acts as default argument value

Question

Why after upgrading from:

    "@typescript-eslint/eslint-plugin": "^4.13.0",
    "@typescript-eslint/parser": "^4.13.0",

to:

    "@typescript-eslint/eslint-plugin": "^4.14.0",
    "@typescript-eslint/parser": "^4.14.0",

eslint has started to flag in the class below (written in Typescript) currentPalette as not defined [eslint(no-undef)] where it acts as default argument for whichPalette?

class Colormap {

    private currentPalette: string;

    getColors(numberColors: number, whichPalette = this.currentPalette): string[] {
        const colors = palette(whichPalette, numberColors);
        return colors.map((color) => `#${color}`);
    }
}

Thanks for clarifying!

question from:https://stackoverflow.com/questions/65847116/eslint-flags-as-not-defined-class-member-that-acts-as-default-argument-value

Answer 1

No way to make default argument work. So I returned to the good old way:

class Colormap {

    private currentPalette = "";

    getColors(numberColors: number, whichPalette?: string): string[] {
        const colors = palette(whichPalette ?? this.currentPalette, numberColors);
        return colors.map((color) => `#${color}`);
    }
}

This works and satisfy eslint. Have a nice day! mario