Support @class in JSDoc

[mjbvz]

From microsoft/vscode#15168

For the following JavaScript code:

/**
 * @class
 * 
 * @param {number} x
 */
function Foo(x) {
    this.x = x
}

/**
 * @param {Foo} foo
 */
const request = function(foo) {

}

The @class jsdoc annotation for Foo does not seem to be recognized, so the type of foo in request is any:

Changing the code to use class fixes the issue (you don't actually need the @class in this case):

[rubiesonthesky]

Still can be repro'ed in playground. In VS Code, hover shows correct type.

// @noImplicitAny: false
// @noImplicitThis: false
/**
 * @class
 * 
 * @param {number} x
 */
function Foo(x) {
    this.x = x
}

/**
 * @param {Foo} foo
 */
const request = function(foo) {
//                       ^?
}

Workbench Repro

[typescript-bot]

👋 Hi, I'm the Repro bot. I can help narrow down and track compiler bugs across releases! This comment reflects the current state of this repro running against the nightly TypeScript.

---

Comment by @rubiesonthesky

⚠️ Assertions:

• (parameter) foo: any

Historical Information

Version	Reproduction Outputs
5.0.2, 5.1.3, 5.2.2, 5.3.2, 5.4.2	⚠️ Assertions: (parameter) foo: any