Steps to reproduce

Create an empty serverless project for typescript: (after installing typescript, run serverless create --template aws-nodejs-typescript --path aws-serverless-typescript-api
Install the package
In the hello-world function created by the template, add the next code (with the required import): validate('US', '12345')
Run the function (serverless offline)
It will throw with the error: Cannot find module '/Users/e10117069/Code/MS/address-management-purchase-api/.esbuild/.build/src/functions/helloWorld/formats/US.json'\nRequire stack:\n- /Users/e10117069/Code/MS/address-management-purchase-api/.esbuild/.build/src/functions/v1/helloWorld/handler.js\n- /Users/e10117069/Code/MS/address-management-purchase-api/node_modules/serverless-offline/src/lambda/handler-runner/in-process-runner/aws-lambda-ric/UserFunction.js

Problem

As serverless builds the required dependencies in just on output file and it tries to obtain the json files from the root folder of the output.

Add and configure webpack to add the json files to the root folder of the function.

Allowing to force using the format web (that adds the files with require, so they are included in the bundle). Added pull request: https://github.com/Cimpress-MCP/postal-codes-js/pull/78