![]() ![]() mandatory, but explicitly typed as option This is how you could bind to a div in Framer Motion with the new record type spreads: For instance, in the case of the animation library Framer Motion, one could easily extend the native DOM types with additional properties specific to the library, leading to a more seamless and type-safe integration. This feature can be particularly useful when extending DOM nodes. Use case: Extending the Built-in DOM Nodes Needless to say, this feature offers a much better ergonomics when working with types with lots of fields, where variations of the same underlying type are needed. ![]() It's important to note that duplicate field names are not allowed across the records being spread, even if the fields share the same type. This operation inlines the fields from the spread records directly into the new record definition, while preserving their original properties, such as whether they are optional or mandatory. Record type spreads act as a 'copy-paste' mechanism for fields from one or more records into a new record. In ReScript v11, you can now spread one or more record types into a new record type. This was often tedious, error-prone and made code harder to maintain, especially when working with records with many fields. This means one had to copy / paste all the fields between the different record definitions. Record Type SpreadĪs stated above, there was no way to share subsets of record fields with other record types. Let's dive right into the details and show-case the new language capabilities. This is why ReScript v11 will come with two new big enhancements for record types: Record Type Spread and Record Type Coercion. We think that records are a much more powerful data structure though, so we want to encourage more record type usage for these scenarios. To mitigate the limitations above, one would need to retreat to structural objects to allow more flexible object field sharing and sub-typing, at the cost of more complex type errors and no pattern matching capabilities. Records are a fundamental part of ReScript, offering a clear and concise definition of complex data structures, immutability by default, great error messages, and support for exhaustive pattern matching.Įven though records are generally preferable for defining structured data, there are still a few ergonomic annoyances, such as.Įxisting record types can't be extended, which makes them hard to composeįunctions may only accept record arguments of the exact record type (no explicit sub-typing) You can check out the first post on better interop with customizable variants here. Invalid HTML may cause hydration mismatch such as div inside p.This is the second post covering new capabilities that'll ship in ReScript v11. An example of this is using window in a component's rendering.Īn example: function M圜omponent ( ) In general this issue is caused by using a specific library or application code that is relying on something that could differ between pre-rendering and the browser. This can cause the React tree to be out of sync with the DOM and result in unexpected content/attributes being present. The first render is called Hydration which is a feature of React. While rendering your application, there was a difference between the React tree that was pre-rendered (SSR/SSG) and the React tree that rendered during the first render in the Browser. Text content does not match server-rendered HTML Why This Error Occurred ![]()
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