An object representing the set of aliases for a key: { alias: { foo: ['f']} }.

Indicate that keys should be parsed as an array: { array: ['foo', 'bar'] }. Indicate that keys should be parsed as an array and coerced to booleans / numbers: { array: [ { key: 'foo', boolean: true }, {key: 'bar', number: true} ] }`.

Arguments should be parsed as booleans: { boolean: ['x', 'y'] }.

Indicate a key that represents a path to a configuration file (this file will be loaded and parsed).

configuration objects to parse, their properties will be set as arguments

Provide configuration options to the yargs-parser.

Provide a custom synchronous function that returns a coerced value from the argument provided (or throws an error), e.g. { coerce: { foo: function (arg) { return modifiedArg } } }.

Indicate a key that should be used as a counter, e.g., -vvv = {v: 3}.

Provide default values for keys: { default: { x: 33, y: 'hello world!' } }.

Environment variables (process.env) with the prefix provided should be parsed.

Specify that a key requires n arguments: { narg: {x: 2} }.

path.normalize() will be applied to values set to this key.

Keys should be treated as strings (even if they resemble a number -x 33).

Keys should be treated as numbers.

i18n handler, defaults to util.format

alias lookup table defaults