Readonly identifierDetermine whether this resolver can resolve the provided key.
The key to check
The parser opts
Resolve the provided key to its string value.
This value should not be validated in any way other than ensuring it is not nullish.
The key to resolve
The parser opts
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Represents a secondary resolution source (after user arguments) for which argument values can be obtained.
These sources may be from a network, from the file system, or from the environment.