.env-cmdrc.js

const debug = {
    BUILD_TYPE : "debug",
}

const ci = {
    ...debug,
    CI : "true",
};

module.exports = {
    ci,
    debug,
};

README.md

Repro Steps

1. download a copy of this gist, unzip somewhere
2. open cli to that folder
3. npm install
4. npx env-cmd -e ci echo "hi"

outputs:

Error: Invalid .rc file path.
    at Object.<anonymous> (C:\Users\tivac\Desktop\env-cmd-test\node_modules\env-cmd\dist\parse-rc-file.js:27:19)
    at Generator.throw (<anonymous>)
    at rejected (C:\Users\tivac\Desktop\env-cmd-test\node_modules\env-cmd\dist\parse-rc-file.js:5:65)

package.json

{
  "name": "env-cmd-test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "license": "MIT",
  "devDependencies": {
    "env-cmd": "^9.0.3"
  }
}