Function syncExpression

syncExpression<T extends Readonly<Record<string, any>>, A extends Option<T>>(
    modelConstructor: PersistentModelConstructor<T>,
    conditionProducer: ConditionProducer<T, A>,
): Promise<
    {
        conditionProducer: ConditionProducer<T, A>;
        modelConstructor: PersistentModelConstructor<T>;
    },
>
Build an expression that can be used to filter which items of a given Model are synchronized down from the GraphQL service. E.g.,
```
import { DataStore, syncExpression } from 'aws-amplify/datastore';
import { Post, Comment } from './models';


DataStore.configure({
	syncExpressions: [
		syncExpression(Post, () => {
			return (post) => post.rating.gt(5);
		}),
		syncExpression(Comment, () => {
			return (comment) => comment.status.eq('active');
		})
	]
});
```
When DataStore starts syncing, only Posts with rating > 5 and Comments with status === 'active' will be synced down to the user's local store.
Type Parameters
- T extends Readonly<Record<string, any>>
- A extends Option<T>
Parameters
- modelConstructor: PersistentModelConstructor<T>
  The Model from the schema.
- conditionProducer: ConditionProducer<T, A>
  A function that builds a condition object that can describe how to filter the model.
Returns Promise<
    {
        conditionProducer: ConditionProducer<T, A>;
        modelConstructor: PersistentModelConstructor<T>;
    },
>
An sync expression object that can be attached to the DataStore syncExpressions configuration property.