Accept @property jsdoc

[barsdeveloper]

Sometimes it is necessary to document classes with properties added dynamically (outside the class). The way I was documenting those before was the following way:

// @ts-check
 class ClassName {
    constructor () {
        /** @type {String} */
        this.propName
    }
}

But a recent update of VS Code made this illegal (Property 'propName' is used before being assigned.ts(2565))
There might be a way to document it using @property from JSDoc

// @ts-check
/**
 * Class definition
 * @property {String} propName
 */
 class ClassName {
    constructor () {
    }
}

But unfortunately it seems to be unsupported by VSCode.

EDIT:
I am aware there is the following syntax

 class ClassName {
    /** @type {String} */
    propName
    constructor () {
    }
}

This is not a satisfactory solution though because it will change the semantic of the code when you want to iterate over the properties of an object when its properties are defined in the super class (It changes the order of declaration)

[mjbvz]

Tracked upstream becausehttps://github.com/microsoft/TypeScript/issues/28730

You're seeing that error because this.propName is just referencing the value without assigning it. You can initialize the value to fix it (and this would be preferable to @property IMO as the @property example would mean the types are inaccurate until the external assignment takes place):

class ClassName {
    constructor () {
        this.propName = '';
    }
}