Incorrect module entrypoint in package.json

Currently the package.json reads:
```
{
  // ...
  "module": "./dist/component/main.es.js"
  "exports": {
    "import": "./dist/component/main.es.js"
  }
  // ...
}
```
It's missing the m in "esm":
```
{
  // ...
  "module": "./dist/component/main.esm.js"
  "exports": {
    "import": "./dist/component/main.esm.js"
  }
  // ...
}
```