mocha 10 + chai 5 + ts-node

.mocharc.json

{
  "loader": "ts-node/esm",
  "extensions": ["ts"],
  "spec": [
    "tests/*.ts"
  ]
}

package.json

{
  "name": "temp-chai",
  "version": "1.0.0",
  "type": "module",
  "main": "lib/main.js",
  "scripts": {
    "test": "mocha"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@types/chai": "^4.3.11",
    "@types/mocha": "^10.0.6",
    "chai": "^5.0.0",
    "mocha": "^10.2.0",
    "ts-node": "^10.9.2",
    "typescript": "^5.3.3"
  }
}

src-main.ts

export const a = 5;

export const b = 6;

export const c = () => 7;

tests-main.test.ts

import {expect} from 'chai';
import * as main from '../src/main.js';

describe('main', () => {
  it('should export things', () => {
    expect(main.a).to.equal(5);
    expect(main.b).to.equal(6);
    expect(main.c()).to.equal(7);
  });
});

tsconfig.json

{
  "compilerOptions": {
    "outDir": "./lib",
    "sourceMap": true,
    "module": "nodenext",
    "moduleResolution": "nodenext",
    "target": "esnext",
    "forceConsistentCasingInFileNames": true,
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noFallthroughCasesInSwitch": true,
    "strict": true
  },
  "include": [
    "src/**/*.ts"
  ]
}

Any idea why when I run this I get this error:

SyntaxError[ @/Users/johnsmac/bigproject/tests/system.spec.ts ]: Unexpected token '{'