Your code is passing a function as an argument to find. Type 'void' is not assignable to type 'boolean'. Ive been reading documentation and working on getting started with a React project using Okta for identity management and TypeScript as opposed to regular ES6. In practice, this means that the predicate is called for each item in data, and the first item in data for which your predicate returns true is the value returned by find. privacy statement. The predicate here defines a boolean outcome based on conditions defined in the function itself, so that the find method can determine which value to find. You signed in with another tab or window. Type 'false | (() => any)' is not assignable to type 'void | Destructor'. Have a question about this project? What TypeScript is saying is that the find function doesn't expect to receive a function that takes a Conversation and returns void. TypeScript describes this as (element: Conversation) => void'. Well occasionally send you account related emails. I created free React application that is viewed and used How hard is to make a shift from React to Next ? Type 'undefined' is not assignable to type 'HTMLDivElement | null'. I want to make a cart, to do that I need a state that can be used by ProductList.tsx and Cart.tsx. Typescript: SQLStatementErrorCallback "Type 'void' is not assignable to type 'boolean". Type '(string | Dispatch>)[]' is not assignable to type 'string'. How are null values in C# string interpolation handled? Therefore when you don't specify the type to mirror the statement callabck, it creates a typescript error "Type 'void' is not assignable to type 'boolean". The success counterpart SQLStatementCallback and also the transaction variants are all typed as returning void. Type 'boolean' is not assignable to type 'void | Destructor'. How do I set ionic serve to use Chrome as the default browser? It means that the callback function you passed to this.dataStore.data.find should return a boolean and have 3 parameters, two of which can be optional: However, your callback function does not return anything (returns void). Types of property 'current' are incompatible. Type '{ card: PlayCard; }' is not assignable to type Ive built a fully themeable and accessible dark mode Code wont let me rest when sleeping at night. Are chain ternary operators an antipattern? The predicate here defines a boolean outcome based on conditions defined in the function itself, so that the find method can determine which value to find. https://github.com/expo/expo/blob/main/packages/expo-sqlite/src/SQLite.types.ts The package otherwise works just fine. So I make a context that provide value of state cart and setCart. It can be bypassed by specifying : any or : boolean and returning true/false however that creates unclear unnecessary code in both cases. I guess this is meant for doing your own thing or hosting/rendering it yourself, which I dont need to do. https://github.com/expo/expo/blob/main/packages/expo-sqlite/build/SQLite.types.d.ts. The SQLStatementErrorCallback is defined with a return type boolean - this is not documented in SDK docs neither in code comments the type also doesn't seem to be used in repo for typing elsewhere. These two places need to be consistent. Press question mark to learn the rest of the keyboard shortcuts. So I am assuming this is a typo and probably should also be typed as void or JSDocs comment added what boolean under what circumstances should be returned if it really is needed (not retuning in regular JS doesn't seem to affect it). Press J to jump to the feed. Thank you very much for your work. The first references the function passed as the first parameter to useEffect, the second references the ref attribute on the