Feature request: add `clearCaches` method for testing

[dreamorosi]

Use case

When testing code that uses the Parameters utility, and specifically some of the high-order functions like getParameter or getAppConfig, it's important that users have the ability to control cache eviction.

Right now users can manually import the DEFAULT_PROVIDERS object and manually clean the cache of each provider, i.e.:

import { DEFAULT_PROVIDERS } from '@aws-lambda-powertools/parameters';

for (const provider of Object.values(DEFAULT_PROVIDERS)) {
  provider.clearCache();
}

This however results in unnecessary boilerplate code. There is an opportunity to provide a better DX by exposing a clearCaches helper function that incapsulate this code as well as any future underlying logic required to clean cache.

Solution/User Experience

import { clearCaches } from '@aws-lambda-powertools/parameters';

clearCaches();

The function will iterate the DEFAULT_PROVIDERS and call the clearCache method on each one.

Alternative solutions

N/A

Acknowledgment

• This feature request meets Lambda Powertools Tenets
• Should this be considered in other Lambda Powertools languages? i.e. Python, Java, and .NET

Future readers

Please react with 👍 and your use case to help us understand customer demand.

[github-actions]

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