Infer from usage codefix should work in JS 

**TypeScript Version:** 2.7.0-dev.20171117

**Code**

```js
function f(x) {
 return x + 1;
}
```

**Expected behavior:**

```js
/** @param {number} x */
function f(x) {
 return x + 1;
}
```

**Actual behavior:**

No fix.