Function KeyPath

KeyPath(options?: KeyPathOptions): PropertyDecorator
Property decorator that designates the decorated field as the primary key (key path) for the entity's IndexedDB object store.

Exactly one property per entity class may be annotated with @KeyPath. For composite keys spanning multiple fields, use CompositeKeyPath at the class level instead.
Parameters
- Optionaloptions: KeyPathOptions
  Optional key generation and auto-increment configuration.
Returns PropertyDecorator
Remarks
The decorator stores KeyPathMetadata via reflect-metadata on the constructor. The @DataClass decorator validates at class decoration time that exactly one key path is present.
Example: Single UUID key
```
@DataClass()
class Document {
  @KeyPath({ generator: 'uuid' })
  id!: string;
}
```
Example: Auto-increment numeric key
```
@DataClass()
class Task {
  @KeyPath({ autoIncrement: true })
  id!: number;
}
```
- Defined in index.ts:1397