Advanced Guides

Built‑in JavaScript types

Use FactoryType to generate sensible defaults for primitives

Overview

Decorated Factory can generate sensible defaults for JavaScript primitives out of the box using @FactoryType.

Example

class Document {
  @FactoryType(() => String)
  title: string;
 
  @FactoryType(() => Number)
  version: number;
 
  @FactoryType(() => Boolean)
  isPublished: boolean;
 
  @FactoryType(() => Date)
  createdAt: Date;
 
  @FactoryType(() => [String])
  tags: string[];
}
 
const document = factory.one(Document).with(3, 'tags').make();

Notes

Works with .one()/.many(), .with() for arrays, and returns instances with .make() or plain objects with .plain().

Overriding and excluding

Customize generated data with set() and without()

Helpers

AutoIncrement and UUID helpers for convenient identifiers