Object.assing(this, {...}) not interpreted in constructors

[dilyanpalauzov]

For this file:

class T {
    a: string
    constructor (a:string) {
	Object.assign(this, {a})
    }
}

let t = new T('b')

tsc 3.8.3 reports

error TS2564: Property 'a' has no initializer and is not definitely assigned in the constructor.

I think property 'a'is definitely assigned in the constructor. this.a = a means the same.

[MartinJohns]

Duplicate of #28883. Search terms: object assign this constructor.

[typescript-bot]

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