Multi tool use

Webstorm + Flow + React: Unresolved variable or type $Keys

I'm trying to follow the docs for declaring an enum in flow. The docs say to use one of these utility classes:
Flow Utility classes: flow.org/en/docs/types/utilities

When I follow the pattern listed in the docs:

// @flow
const countries = {
US: "United States",
IT: "Italy",
FR: "France"
};

type Country = $Keys<typeof countries>;

const italy: Country = 'IT';
const nope: Country = 'nope'; // 'nope' is not a Country


Webstorm complains that $Keys is an unresolved variable or type.

Testing further, it also does this with $Values, $ReadOnly, and any of the other utility types.

My stack is CRA+Redux+Flow.

Stuff I've tried:

I've searched around in circles with no answer. I found one source saying "install flow globally instead", I tried that, but it didn't work.

Looking for ways to do an enum without a utility class: I'm sure there's a way, but I've not found it yet

Flow is set as the Javascript type on webstorm

Turning it off and back on

picture:

webstorm

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