require('apecs') fails: exports map has no default/require condition

[k9p5]

Summary

require('apecs') throws on Node 20.19 (the engines floor), even though Node supports require(esm) there.

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: No "exports" main defined in node_modules/apecs/package.json
  code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'

Cause

Every entry in the exports map in package.json declares only types and import. There is no require or default condition, so a CommonJS resolver finds no match at all. This affects any CJS consumer: Jest without ESM mode, older bundler configs, ts-node in CJS mode, and plain require in Node scripts.

Repro

mkdir smoke && cd smoke && npm init -y && npm i apecs@0.1.0
node -e "console.log(require('apecs').VERSION)"

Suggested fix

Add a default condition to each subpath pointing at the same ESM file. Node >= 20.19 resolves it through require(esm):

".": {
  "types": "./dist/index.d.ts",
  "import": "./dist/index.js",
  "default": "./dist/index.js"
}

Same for ./react, ./solid and ./internal. No CJS build is needed. Found by a post-publish smoke test of 0.1.0.