layerPublisher.class.test.functionCode.ts

import { readFileSync } from 'node:fs';
import { Logger } from '@aws-lambda-powertools/logger';
import { Metrics } from '@aws-lambda-powertools/metrics';
import { Tracer } from '@aws-lambda-powertools/tracer';
import { SSMProvider } from '@aws-lambda-powertools/parameters/ssm';

const logger = new Logger({
  logLevel: 'DEBUG',
});
const metrics = new Metrics();
const tracer = new Tracer();
new SSMProvider();

export const handler = (): void => {
  // Check that the packages version matches the expected one
  const packageJSON = JSON.parse(
    readFileSync(
      '/opt/nodejs/node_modules/@aws-lambda-powertools/logger/package.json',
      {
        encoding: 'utf8',
        flag: 'r',
      }
    )
  );

  if (packageJSON.version != process.env.POWERTOOLS_PACKAGE_VERSION) {
    throw new Error(
      `Package version mismatch: ${packageJSON.version} != ${process.env.POWERTOOLS_PACKAGE_VERSION}`
    );
  }

  // Check that the logger is working
  logger.debug('Hello World!');

  // Check that the metrics is working
  metrics.captureColdStartMetric();

  // Check that the tracer is working
  const segment = tracer.getSegment();
  const handlerSegment = segment.addNewSubsegment('### index.handler');
  tracer.setSegment(handlerSegment);
  tracer.annotateColdStart();
  handlerSegment.close();
  tracer.setSegment(segment);
};