inline openapi specs fail to load in a node environment

[cogwirrel]

Description

If you use the createClient function in a node environment and pass in an OpenAPI spec as an object, createClient attempts to read the current directory instead of using the spec.

eg:

createClient({
  input: { openapi: '3.0.3', info: ... },
  output: 'out',
  dryRun: true,
  plugins: ['@hey-api/client-fetch'],
});

Results in the error:

🔥 Unexpected error occurred. Error opening file "/path/to/my/project" 
EISDIR: illegal operation on a directory, read

Reproducible example or configuration

https://github.com/cogwirrel/heyapi-bug-inline-spec

npm install
npx node broken.js

Notice that it works ok if we pretend we're in a browser:

// Pretend to be in a web environment
global.window = {};
global.location = { href: 'https://some-website/' };

await createClient({
  input: { openapi: '3.0.3', info: ... },
  output: 'out',
  dryRun: true,
  plugins: ['@hey-api/client-fetch'],
});

OpenAPI specification (optional)

No response

System information (optional)

Node v20.18.0