/** A closed set an option's answer comes from. */
export type Choices = {
    values: readonly string[];
    /** True when the flag takes several of them, comma-separated. */
    multiple: boolean;
};
/** What deriving a set needs to know about one option or argument. */
export type ChoiceSource = {
    /** The declaration, placeholder and all: `--format <csv|json>`, `<csv|json>`. */
    flags: string;
    /** Commander's own list, on the rare option that declares one. */
    declared?: readonly string[];
};
/** The set an option offers, or undefined when its placeholder names a value. */
export declare function optionChoices(source: ChoiceSource): Choices | undefined;
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