Stone.js API
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    Represents the yargs argument vector.

    interface IArgv {
        positional: (
            name: string,
            options: { choices: string[]; desc: string; type: string },
        ) => IArgv;
    }
    Index
    positional: (
        name: string,
        options: { choices: string[]; desc: string; type: string },
    ) => IArgv