How do I generate enums from TypeScript enums?

[U-4-E-A]

Directory structure: -

src
    graphql
        schema_test
            enums
                testenum.ts
            inputs
                testenum.input.graphql

testenum.ts: -

enum TestEnum {
    EnumOne,
    EnumTwo,
    EnumThree
}
export default TestEnum

testenum.input.graphql: -

input TestInput {
    testProp: [TestEnum]
}

codegen.yml: -

schema: ./src/graphql/schema_test/**/*.*
require:
    - ts-node/register
generates:
    ./src/types/types.d.ts:
        config:
            enumsAsTypes: true
            enumValues: ./src/graphql/schema_test/enums/*
        plugins:
            - "typescript"
            - 'typescript-resolvers'

I get the following error: -

√ Parse configuration
 > Generate outputs
   > Generate ./src/types/types.d.ts
     × Load GraphQL schemas
       → Failed to load schema
       Load GraphQL documents
       Generate
Found 1 error
 ✖ ./src/types/types.d.ts
   Failed to load schema from ./src/graphql/schema_test/**/*.*:
       Type "TestEnum" not found in document.
       Error: Type "TestEnum" not found in document.

What am I doing wrong?