* Combine keyof T inferences
* Extract covariant inference derivation into function
* Test:keyof inference lower priority than return inference
for #22376
* Update 'expected' comment in keyofInferenceLowerPriorityThanReturn
* Update comment in test too, not just baselines
* Fix typo
* Move tests
* No errr on unmatchable `@param` tags
Such as when the initializer is not a function, or when the function
mentions `arguments` in its body.
* Do not require dummy param for JS uses of arguments
1. JS functions that use `arguments` do not require a dummy parameter in
order to get a type for the synthetic `args` parameter if there is an
`@param` with a `...` type.
2.JS functions that use `arguments` and have an `@param` must have a
type that is a `...` type.
* Check for array type instead of syntactic `...`
* Address PR comments
* Update baselines
* Brackets and postfix= in `@param` add undefined
Previously they only added optionality.
Note that, unlike Typescript, when a parameter initializer is specified
in jsdoc, it does not remove undefined in the *body* of the function.
That's because TS will generate initialisation code, but JS won't, so
the author will have to manually write code to remove undefined from the
type.
```js
/** @param {number} [a=101] */
function f(a) {
// a: number | undefined here
if (!a) {
a = 101
}
// a: number here
}
```
Note that we don't check that
1. the initializer value is actually assigned to the parameter.
2. the initializer's type matches the declared type of the parameter.
Pretty much we just parse it and leave it alone.
* Address PR comments
* Call process.stdout._handle.setBlocking(true)
This prevents output from being truncated when the compiler can output
errors to stdout faster than it can receive them. This may slow down
performance for compilations for many errors, but those were already
quite slow.
* Disable tslint no-unnnecessary-type-assertion-2
It is wrong. It *is* necessary.
* Resolve config wildcards result order in a platform independent manner
* Accept affected user test baseline
* Per reccomendation, just change matchFiles
* Add test asserting the same order on differing case sensitive platforms
