Error introspecting an ES Module in mjs format

[GabrielGil]

Describe the bug

The CLI is currently not detecting the schema from the code when using .mjs extension.

To Reproduce

1. Create a schema file in schema.mjs:

export const OctavoGraphqlSchema = new GraphQLSchema({
  types,
  query: RootQuery,
  mutation: RootMutation,
});

export default OctavoGraphqlSchema;

2. Run graphql-inspector introspect graphql/schema.mjs --write schema.graphql

Expected behavior

The inspector should be able to instrospect the schema, same as if it was in a schema.js file.

Environment:

• OS: MacOC Monterrey
• @graphql-inspector/cli: 3.0.2
• graphql: 15.7.2
• NodeJS: 16

Additional context