npm run link-watch produces "`type` in `./package.json` must be of type 'commonjs' | 'module' (received undefined)"

[wildseansy]

When running the README.md quick run steps, the package.json doesn't seem to be properly configured.

# Initialize a new plugin (outside of your Sanity studio folder)
npx @sanity/plugin-kit init sanity-plugin-testing-it-out

# Make your plugin linkable, and compile an initial version
cd sanity-plugin-testing-it-out
npm run link-watch

npm run link-watch produces

[error] `type` in `./package.json` must be of type 'commonjs' | 'module' (received undefined)

To fix this

1. The plugin template package.json needs "type": "module" added

2. "exports": {
    ".": {
      "types": "./lib/src/index.d.ts",
      "source": "./src/index.ts",
      "import": "./lib/index.esm.js",
      "require": "./lib/index.js", // Update to .cjs
      "default": "./lib/index.esm.js"
    },
    "main": "./lib/index.js", //update to .cjs