Unknown file extension

[andyjsbell]

When running through tutorial-1 I get the following:

npm install
npm start

> pimlico-tutorial-template@1.0.0 start
> ts-node-esm index.ts

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for /Users/Dummy/Projects/pimlico-tutorial-1/index.ts
    at new NodeError (node:internal/errors:405:5)
    at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get_format:99:9)
    at defaultGetFormat (node:internal/modules/esm/get_format:142:36)
    at defaultLoad (node:internal/modules/esm/load:91:20)
    at nextLoad (node:internal/modules/esm/hooks:733:28)
    at load (/Users/andrewbell/Projects/pimlico-tutorial-1/node_modules/ts-node/dist/child/child-loader.js:19:122)
    at nextLoad (node:internal/modules/esm/hooks:733:28)
    at Hooks.load (node:internal/modules/esm/hooks:377:26)
    at MessagePort.handleMessage (node:internal/modules/esm/worker:168:24)
    at [nodejs.internal.kHybridDispatch] (node:internal/event_target:778:20) {
  code: 'ERR_UNKNOWN_FILE_EXTENSION'
}

node --version 
v20.4.0
npm --version
9.7.2