schemaWithCustomDecorators.ts

import { SchemaRoot, Query, Field, ObjectType, compileSchema } from 'decapi'

function StringWithDescription(additionalDescription: string) {
  return Field({
    type: String,
    description: `This is custom field. Additional description: ${additionalDescription}`
  })
}

function ExplicitNameObjectType(name: string) {
  if (!name) {
    throw new Error(
      `Classes decorated with @ExplicitNameObjectType require explicit name instead of one guessed from class name.`
    )
  }
  return ObjectType({ name })
}

@ExplicitNameObjectType('MyTypeName')
class CustomObject {
  @StringWithDescription('This is custom field')
  stringValue: string
}

@SchemaRoot()
export class MySchemaCustomDecorators {
  @Query()
  getCustomObject(stringValue: string): CustomObject {
    const object = new CustomObject()
    object.stringValue = stringValue
    return object
  }
}

export const schemaWithCustomDecorators = compileSchema(
  MySchemaCustomDecorators
)