While reviewing a javascript codebase, I stumbled upon a section of code that appears as follows:
export type RouteReducerProps = {|
error?: Error,
isResolving: boolean,
isResolved: boolean,
hasFailed: boolean,
|};
Upon closer inspection, it seems to be a javascript object literal declaration. However, the presence of vertical bars within the curly braces is quite unfamiliar to me. What exactly is their purpose in this context?
The code snippet provided is specifically for use with Flow, a static type checker designed for javascript. It introduces the concept of an Exact Object Type, which restricts the allowable keys in an object to only a specified few. For instance, in this case, the object RouteReducerProps can only have keys like 'error?', 'isResolving', 'isResolved', and 'hasFailed'.
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