The config's parse function returns an object with no enumerable properties.

[plameniv]

The config object returned by the parse function has no enumerable properties.

The following operations do not work:

• console.log(config) prints the empty object;
• const newConfig = { ...config } creates an empty object;
• Object.keys(config) and Object.getOwnPropertyNames(config) don't return any values.

When the property is manually defined in the following manner, the converter functions stop working, i.e. 1m is not converted to 60 (seconds):

Object.defineProperty(target, key, {
     enumerable: true,
     writable: true,
     value: source[key],
});
target.__assignedProperties.add(key);

[plameniv]

#69 addressed symptoms of this bug.

Once the bug is fixed, some of the changes in that PR may be reverted.