A lot of the time, you want to define union types in typescript, and you would set it up like this by default for a small collection of enumerated values-as-types:

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type Foobar = "foo" | "bar" | "baz";

A better way to scale this with more value options, is to use an array index as a type, and have that array contain your options:

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const FoobarOptions = [
	"foo",
	"bar",
	"baz"
] as const;
type Foobar = typeof FoobarOptions[number];

This would do the same thing but it is way less annoying to deal with when you end up with a lot of options.