clearStateMiddy.ts

import { Logger, injectLambdaContext } from '@aws-lambda-powertools/logger';
import middy from '@middy/core';

// Persistent attributes added outside the handler will be 
// cached across invocations
const logger = new Logger({
  logLevel: 'DEBUG',
  persistentLogAttributes: {
    foo: 'bar',
    biz: 'baz'
  }
});

const lambdaHandler = async (event: { special_key: string }, _context: unknown): Promise<void> => {
  // Persistent attributes added inside the handler will NOT be cached
  // across invocations
  if (event['special_key'] === '123456') {
    logger.appendKeys({
      details: { special_key: event['special_key'] }
    });
  }
  logger.debug('This is a DEBUG log');
};

// Enable the clear state flag
export const handler = middy(lambdaHandler)
  .use(injectLambdaContext(logger, { clearState: true }));