loadFileConfigs can be called without an argument (#47534)
loadFileConfigs can be called without an argument (#47534)

In the documentation it mentions the loadFileConfigs argument to be optional: https://github.com/lorenwest/node-config/wiki/Using-Config-Utilities#loadfileconfigsdirectory

Here's the code that makes it optional: https://github.com/lorenwest/node-config/blob/7a440f93440ca074deb55ff220c3998fc67be4d8/lib/config.js#L525
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