Hydration

Hydration is particularly useful when computing the config based on other properties (e.g.) IAM DB authentication For such use cases, the configuration can be hydrated using beforeValidate hook

const configManager = new ConfigManager(validationSchema, { 
    // Both Sync and Async functions are supported    
    beforeValidate: async (config: Partial<Config>) => {
        const token = await getAccessToken()

        // hydrate config
        return { ...config, token }
}})