* Simplify how default program name found. Just use args.

* Rework search for executable files

* Adjust error messaging, still WIP

* Add executableDir and use searching for subcommands

* Wording improvements

* Add TypeScript for nameFromFilename

* Add new tests for name (and nameFromFilename)

* Add TypeScript for executableDir

* Start tests for subcommand search

* Comment-out unused routine for lint, WIP

* Refactor tests and skip launchable executable tests on Windows

* Add notes on further tests

* Filling out mock executable tests

* Expand tests

* Remove debugging and ToDo

* Relative and absolute test for executableDir

* Avoid memory leak warning

* Fix relative search test

* Separate and expand .name section in README.

And some lint, remove trailing spaces et al

* Add .name to multiple subcommand example

* Update description of executable search.

Add mention of .executableDir

* Add coverage of naming subcommands.

* FIrst try at exports in package.json

* Set required version for conditional export in package.json

* Update README with export support

* Add defaultOption, but not implemented

* Start refactoring addOption to clarify logic

* Update comments

* Implement separate default and preset for options

* Changed behaviour of boolean default, fix and extend test

* Update unit tests with new default/preset behaviour

* Add tests for default with all option types

* Add tests that default does get overwritten

* Fix JSDoc for new routines

* Add tests for preset

* Add typings

* Update README

* Add test of preset with negated

* Update comments

* Add tests of options being used twice

* Modify documentation for preset

* Add prefix example usage in README

* Add preset to help

* Update code example

* Use same format for preset as for default, add test

* Be selective about default and preset shown in help

* Throw error for wrong argument to option or requiredOption

* Make test and error message more specific

* Update package-lock.json to lockfile@2

* Update Jest

* Update Jest

* Update @types/node

* Update standard

* Quick Start

* Update comments

* Update quick start examples so README and code match

…c() (#1669)

* Make .aliases() param readonly

* Make .parse() and .parseAsync() param readonly in TypeScript

* Add eslint-config-standard peer dependencies explicitly

* Remove unused eslint customisation, closer to standard

* Configure eslint with no-extra-semi, as per semistandard

* Use standard-with-typescript again now installing dependencies

* Fix linting for undefined property

* Run js and rs lint by default for `npm run lint`

* Allow readonly array as parameter of .choices()

Without `readonly`, readonly arrays cannot be passed as parameters.

Example: https://www.typescriptlang.org/play?#code/GYVwdgxgLglg9mABMAjACgIYCcsC5EDOUWMYA5gNoC6AlIgN4C+AUKJLAsgEyY75YBTDABMEAGwCehYqUq0GLZhARFE2LCkQBeRBQDkGPVQDcSlVDU4u23QaNqCiZWCKnW6dShqngPT9-deLC4A3yCQ4yA

* Add tests for .choices() typings

* Take a defensive copy of .choices argument to make sure it's readonly

* Expand choices tests to cover readonly contract (#1)

* Use the defensive copy of the parameter of .choices() in parseArg

Co-authored-by: John Gee <john@ruru.gen.nz>

* Proof of concept

* Use separate method for optsWithGlobals

* Add documentation

* Add tests

* Simplify description

* Add example

* Remove unused param

* Refactor private _displayError() into public error()

* add TypeScript

* Add tests

* Add to README

* Tiny wording change