Flow does not have an equivalent utility type like TypeScript's Record that I am searching for.
I experimented with using { [key: KeyType]: Value } in Flow, but found that it carries a different semantic meaning.
Flow does not have an equivalent utility type like TypeScript's Record that I am searching for.
I experimented with using { [key: KeyType]: Value } in Flow, but found that it carries a different semantic meaning.
The similarity with TypeScript is striking:
// @flow
type Record<T, V> = {
[T]: V
}
Using the example from the TypeScript documentation:
type ThreeStringProps = Record<'prop1' | 'prop2' | 'prop3', string>
const test: ThreeStringProps = {
prop1: 'test',
prop2: 'test',
prop3: 'test',
}
// This fails because prop3 is not a string
const failingTest: ThreeStringProps = {
prop1: 'test',
prop2: 'test',
prop3: 123,
}
// This also fails since `prop4` is not a valid property
const failingTest2: ThreeStringProps = {
prop1: 'test',
prop2: 'test',
prop3: 'test',
prop4: 'test',
}
You can experiment with this on Try Flow.
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