Helper
======
Provides helper functions for developing modules.
Functions
---------
- `add-zsh-trap` adds a function name to a list to be called when a trap is
triggered.
- `is-autoloadable` checks if a file can be autoloaded by trying to load it
in a subshell.
- `is-callable` checks if a name is a command, function, or alias.
- `is-true` checks a boolean variable for "true".
- `coalesce` prints the first non-empty string in the arguments array.
Authors
-------
*The authors of this module should be contacted via the [issue tracker][1].*
- [Sorin Ionescu](https://github.com/sorin-ionescu)
[1]: https://github.com/sorin-ionescu/prezto/issues
