Regression: JSDoc '@public' comment on constructor parameter affects JS emit

[rbuckton]

TypeScript Version: 3.9.1-rc, 4.0.0-dev

Search Terms: jsdoc comment parameter property modifier constructor public private protected readonly

Code

// @allowJS: true
// @checkJS: true
// @out: output.js
// @target: esnext
// @filename: input.js
class C {
	constructor(/** @public */ y) {
	}
}

Expected behavior:

The emit should be be the following:

class C {
    constructor(/** @public */ y) {
    }
}

Actual behavior:

The emit includes a this property assignment as if the above declaration was a TypeScript parameter property:

class C {
    constructor(/** @public */ y) {
        this.y = y;
    }
}

Playground Link: NOTE: Cannot repro in the playground as the playground does not support JS output when using JS as the input language

[rbuckton]

I have a fix for this that I will be posting shortly in my nodeFactory branch as part of #35282, but we may want to address this sooner during RC.

/cc @DanielRosenwasser, @RyanCavanaugh