2024 06 10 handling type errors when updating sprites state using functional updates - bizkite-co/handterm GitHub Wiki
original file name: Codeium Chat - tHDFpFmgqbnmxZPdjzfGwcnSUuOMclN5.md
summary: The chat started with the user encountering a type error when trying to update the sprites state using the setSprites function. The error indicated a mismatch between the expected type and the provided object structure.
Codeium provided guidance on how to update the state correctly, suggesting to use the functional update form of setSprites and ensure the object structure aligns with the expected type.
The user then tried to implement the suggestion but encountered another error due to spreading undefined into the record when updating the state.
Codeium recommended providing a default value for prevSprites in case it is undefined to resolve the issue.
The user modified the code again but faced a new error regarding incompatible types where Sprite was expected but receiving Sprite | undefined. Codeium suggested updating the sprites state to allow undefined values for each key or handle the case where sprite might be undefined separately.
The user confirmed that ActionType should never be undefined but Sprites could be before they are loaded. Codeium mentioned the issue with undefined values not being assignable to Sprite and provided guidance on how to handle an initial state that could be undefined while ensuring compatibility with the expected structure.
The chat concluded with Codeium providing further guidance on managing the sprites state to allow for partial records until all sprites are loaded without encountering type errors related to undefined values.
date: 2024-06-10T10:58
Note: This is purely the output of the chat conversation and does not contain any raw data, codebase snippets, etc. used to generate the output.
User at 10:58 am, Jun 10, 2024
Explain problem: Argument of type '{ Run?: Sprite | undefined; Idle?: Sprite | undefined; Walk?: Sprite | undefined; Jump?: Sprite | undefined; Attack?: Sprite | undefined; Death?: Sprite | undefined; Hurt?: Sprite | undefined; }' is not assignable to parameter of type 'SetStateAction<Record<ActionType, Sprite> | undefined>'. Type '{ Run?: Sprite | undefined; Idle?: Sprite | undefined; Walk?: Sprite | undefined; Jump?: Sprite | undefined; Attack?: Sprite | undefined; Death?: Sprite | undefined; Hurt?: Sprite | undefined; }' is not assignable to type 'Record<ActionType, Sprite>'. Types of property 'Run' are incompatible. Type 'Sprite | undefined' is not assignable to type 'Sprite'. Type 'undefined' is not assignable to type 'Sprite'.
Codeium at 10:58 am, Jun 10, 2024
The issue you are facing is due to the types not aligning correctly in the setSprites function call. The error message indicates that the structure of the object you are trying to set with setSprites is not compatible with the expected type.
To resolve this issue, you need to ensure that the sprites state is properly updated. Since setSprites expects a Record<ActionType, Sprite> | undefined, you should update the state with a complete object that matches this type.
Here's how you can adjust the setSprites call to resolve the error:
setSprites((prevSprites) => ({ ...prevSprites, [actionKey]: sprite }));By using the functional update form of setSprites, you can access the previous state (prevSprites), spread its values, and then add the new key-value pair [actionKey]: sprite to maintain the correct type structure.
This modification ensures that the state update aligns with the expected type and resolves the type incompatibility issue.
User at 11:00 am, Jun 10, 2024
That gives me this error:
Argument of type '(prevSprites: Record<ActionType, Sprite> | undefined) => { Run?: Sprite | undefined; Idle?: Sprite | undefined; Walk?: Sprite | undefined; Jump?: Sprite | undefined; Attack?: Sprite | undefined; Death?: Sprite | undefined; Hurt?: Sprite | undefined; }' is not assignable to parameter of type 'SetStateAction<Record<ActionType, Sprite> | undefined>'.
Type '(prevSprites: Record<ActionType, Sprite> | undefined) => { Run?: Sprite | undefined; Idle?: Sprite | undefined; Walk?: Sprite | undefined; Jump?: Sprite | undefined; Attack?: Sprite | undefined; Death?: Sprite | undefined; Hurt?: Sprite | undefined; }' is not assignable to type '(prevState: Record<ActionType, Sprite> | undefined) => Record<ActionType, Sprite> | undefined'.
Call signature return types '{ Run?: Sprite | undefined; Idle?: Sprite | undefined; Walk?: Sprite | undefined; Jump?: Sprite | undefined; Attack?: Sprite | undefined; Death?: Sprite | undefined; Hurt?: Sprite | undefined; }' and 'Record<ActionType, Sprite> | undefined' are incompatible.
The types of 'Run' are incompatible between these types.
Type 'Sprite | undefined' is not assignable to type 'Sprite'.
Type 'undefined' is not assignable to type 'Sprite'.ts(2345)
⚠ Error (TS2345) |
Argument of type:(
prevSprites: Record<ActionType, Sprite> | undefined
) => {
Run?: Sprite | undefined;
Idle?: Sprite | undefined;
Walk?: Sprite | undefined;
Jump?: Sprite | undefined;
Attack?: Sprite | undefined;
Death?: Sprite | undefined;
Hurt?: Sprite | undefined;
}
is not assignable to parameter of type:SetStateAction<
Record<ActionType, Sprite> | undefined
>
.
Type:(
prevSprites: Record<ActionType, Sprite> | undefined
) => {
Run?: Sprite | undefined;
Idle?: Sprite | undefined;
Walk?: Sprite | undefined;
Jump?: Sprite | undefined;
Attack?: Sprite | undefined;
Death?: Sprite | undefined;
Hurt?: Sprite | undefined;
}
is not assignable to type:(
prevState: Record<ActionType, Sprite> | undefined
) => Record<ActionType, Sprite> | undefined
. Call signature return types:{
Run?: Sprite | undefined;
Idle?: Sprite | undefined;
Walk?: Sprite | undefined;
Jump?: Sprite | undefined;
Attack?: Sprite | undefined;
Death?: Sprite | undefined;
Hurt?: Sprite | undefined;
}
and Record<ActionType, Sprite> | undefined
are incompatible. The types of Run are incompatible between these types. Type Sprite | undefined
is not assignable to type Sprite
. Type undefined
is not assignable to type Sprite
.Codeium at 11:00 am, Jun 10, 2024
The error is occurring because the sprites state is initially set to undefined and TypeScript is strict about the types. When you spread prevSprites, which could be undefined, TypeScript will not allow undefined to be spread into a Record<ActionType, Sprite>.
To fix this, you need to provide a default value for prevSprites in case it is undefined. Here's how you can do it:
setSprites((prevSprites) => ({ ...prevSprites ?? {}, [actionKey]: sprite }));In the above code, the ?? is the nullish coalescing operator, which will return an empty object {} if prevSprites is undefined. This way, TypeScript knows that the result will always be a Record<ActionType, Sprite> and not undefined.
User at 11:03 am, Jun 10, 2024
Now I am getting this. Would it help if I redefined something better?
Argument of type '(prevSprites: Record<ActionType, Sprite> | undefined) => { Run?: Sprite | undefined; Idle?: Sprite | undefined; Walk?: Sprite | undefined; Jump?: Sprite | undefined; Attack?: Sprite | undefined; Death?: Sprite | undefined; Hurt?: Sprite | undefined; }' is not assignable to parameter of type 'SetStateAction<Record<ActionType, Sprite> | undefined>'.
Type '(prevSprites: Record<ActionType, Sprite> | undefined) => { Run?: Sprite | undefined; Idle?: Sprite | undefined; Walk?: Sprite | undefined; Jump?: Sprite | undefined; Attack?: Sprite | undefined; Death?: Sprite | undefined; Hurt?: Sprite | undefined; }' is not assignable to type '(prevState: Record<ActionType, Sprite> | undefined) => Record<ActionType, Sprite> | undefined'.
Call signature return types '{ Run?: Sprite | undefined; Idle?: Sprite | undefined; Walk?: Sprite | undefined; Jump?: Sprite | undefined; Attack?: Sprite | undefined; Death?: Sprite | undefined; Hurt?: Sprite | undefined; }' and 'Record<ActionType, Sprite> | undefined' are incompatible.
The types of 'Run' are incompatible between these types.
Type 'Sprite | undefined' is not assignable to type 'Sprite'.
Type 'undefined' is not assignable to type 'Sprite'.ts(2345)
⚠ Error (TS2345) |
Argument of type:(
prevSprites: Record<ActionType, Sprite> | undefined
) => {
Run?: Sprite | undefined;
Idle?: Sprite | undefined;
Walk?: Sprite | undefined;
Jump?: Sprite | undefined;
Attack?: Sprite | undefined;
Death?: Sprite | undefined;
Hurt?: Sprite | undefined;
}
is not assignable to parameter of type:SetStateAction<
Record<ActionType, Sprite> | undefined
>
.
Type:(
prevSprites: Record<ActionType, Sprite> | undefined
) => {
Run?: Sprite | undefined;
Idle?: Sprite | undefined;
Walk?: Sprite | undefined;
Jump?: Sprite | undefined;
Attack?: Sprite | undefined;
Death?: Sprite | undefined;
Hurt?: Sprite | undefined;
}
is not assignable to type:(
prevState: Record<ActionType, Sprite> | undefined
) => Record<ActionType, Sprite> | undefined
. Call signature return types:{
Run?: Sprite | undefined;
Idle?: Sprite | undefined;
Walk?: Sprite | undefined;
Jump?: Sprite | undefined;
Attack?: Sprite | undefined;
Death?: Sprite | undefined;
Hurt?: Sprite | undefined;
}
and Record<ActionType, Sprite> | undefined
are incompatible. The types of Run are incompatible between these types. Type Sprite | undefined
is not assignable to type Sprite
. Type undefined
is not assignable to type Sprite
.Codeium at 11:04 am, Jun 10, 2024
It appears that the state update is still causing type issues because TypeScript expects every value in the Record<ActionType, Sprite> to be a Sprite, not Sprite | undefined. The error message indicates that TypeScript does not allow undefined values in the record where only Sprite is expected.
One way to solve this is to ensure that the setSprites updater function only adds values that are defined, and does not attempt to add undefined values. However, since you have a condition where sprite might be undefined, you need to handle this case.
If it is valid for the record to have undefined as a value for any ActionType, you would need to update the state's type to reflect this. Change the type of sprites state to allow undefined values for each key:
const [sprites, setSprites] = useState<Record<ActionType, Sprite | undefined>>();If sprite should never be undefined when calling setSprites, you should first check if sprite is defined before updating the state:
const loadSprite = async (actionKey: ActionType, animationData: SpriteAnimation) => {
const sprite = await spriteManager.loadStream(animationData);
if (sprite) {
setSprites((prevSprites) => ({ ...prevSprites ?? {}, [actionKey]: sprite }));
setSprite(sprite);
}
// Handle the case when sprite is undefined if necessary
};In this code, the setSprites function is only called if sprite is not undefined, which should satisfy TypeScript's type checking. If there is a possibility that sprite is undefined, you need to handle that case separately according to the logic of your application.
User at 11:07 am, Jun 10, 2024
The ActionType should never be undefined. There can be zero Sprites before they are loaded, though.
I think we are getting closer, but now I am getting this:
Argument of type '(prevSprites: Record<ActionType, Sprite> | undefined) => { Run?: Sprite | undefined; Idle?: Sprite | undefined; Walk?: Sprite | undefined; Jump?: Sprite | undefined; Attack?: Sprite | undefined; Death?: Sprite | undefined; Hurt?: Sprite | undefined; }' is not assignable to parameter of type 'SetStateAction<Record<ActionType, Sprite> | undefined>'.
Type '(prevSprites: Record<ActionType, Sprite> | undefined) => { Run?: Sprite | undefined; Idle?: Sprite | undefined; Walk?: Sprite | undefined; Jump?: Sprite | undefined; Attack?: Sprite | undefined; Death?: Sprite | undefined; Hurt?: Sprite | undefined; }' is not assignable to type '(prevState: Record<ActionType, Sprite> | undefined) => Record<ActionType, Sprite> | undefined'.
Call signature return types '{ Run?: Sprite | undefined; Idle?: Sprite | undefined; Walk?: Sprite | undefined; Jump?: Sprite | undefined; Attack?: Sprite | undefined; Death?: Sprite | undefined; Hurt?: Sprite | undefined; }' and 'Record<ActionType, Sprite> | undefined' are incompatible.
The types of 'Run' are incompatible between these types.
Type 'Sprite | undefined' is not assignable to type 'Sprite'.
Type 'undefined' is not assignable to type 'Sprite'.ts(2345)
⚠ Error (TS2345) |
Argument of type:(
prevSprites: Record<ActionType, Sprite> | undefined
) => {
Run?: Sprite | undefined;
Idle?: Sprite | undefined;
Walk?: Sprite | undefined;
Jump?: Sprite | undefined;
Attack?: Sprite | undefined;
Death?: Sprite | undefined;
Hurt?: Sprite | undefined;
}
is not assignable to parameter of type:SetStateAction<
Record<ActionType, Sprite> | undefined
>
.
Type:(
prevSprites: Record<ActionType, Sprite> | undefined
) => {
Run?: Sprite | undefined;
Idle?: Sprite | undefined;
Walk?: Sprite | undefined;
Jump?: Sprite | undefined;
Attack?: Sprite | undefined;
Death?: Sprite | undefined;
Hurt?: Sprite | undefined;
}
is not assignable to type:(
prevState: Record<ActionType, Sprite> | undefined
) => Record<ActionType, Sprite> | undefined
. Call signature return types:{
Run?: Sprite | undefined;
Idle?: Sprite | undefined;
Walk?: Sprite | undefined;
Jump?: Sprite | undefined;
Attack?: Sprite | undefined;
Death?: Sprite | undefined;
Hurt?: Sprite | undefined;
}
and Record<ActionType, Sprite> | undefined
are incompatible. The types of Run are incompatible between these types. Type Sprite | undefined
is not assignable to type Sprite
. Type undefined
is not assignable to type Sprite
.Codeium at 11:07 am, Jun 10, 2024
I understand the issue now. Your sprites state should be able to hold a Record of ActionType to Sprite where initially it could be an empty object or partial record until all sprites are loaded. The TypeScript error says that undefined is not assignable to the type Sprite, which means that the state updater function is not correctly typed to handle an initial state that could be undefined.
Since the ActionType should never be undefined but the Sprite can be before they are loaded, you can initialize your state to an empty object and type it to a partial record where the values can be Sprite or undefined. Here is how you can do it:
const [sprites, setSprites] = useState<Record<ActionType, Sprite | undefined>>({});Now, your sprites state is an object that can have keys of ActionType with values of Sprite or undefined. When updating the state, TypeScript knows that it's acceptable for some of the values to be undefined, and you won't get that error anymore.
Given this change, the loadSprite function can be kept as is since it correctly checks for undefined before attempting to update the state:
const loadSprite = async (actionKey: ActionType, animationData: SpriteAnimation) => {
const sprite = await spriteManager.loadSprite(animationData);
if (sprite) {
setSprites((prevSprites) => ({ ...prevSprites, [actionKey]: sprite }));
setSprite(sprite);
}
};This should resolve the TypeScript error you're facing.
User at 11:09 am, Jun 10, 2024
The error messages are getting much shorter. Hopefully that is good.
Argument of type '{}' is not assignable to parameter of type 'Record<ActionType, Sprite | undefined> | (() => Record<ActionType, Sprite | undefined>)'.ts(2345)
⚠ Error (TS2345) |
Argument of type {} is not assignable to parameter of type:| Record<ActionType, Sprite | undefined>
| (() => Record<ActionType, Sprite | undefined>)
.Codeium at 11:10 am, Jun 10, 2024
The error message suggests that TypeScript is expecting a Record<ActionType, Sprite | undefined> or a function that returns Record<ActionType, Sprite | undefined>, but it's getting an empty object {} which doesn't fulfill the expected type because the keys of ActionType are missing.
To fix this, we need to ensure that the initial state for sprites is typed correctly. Since we want to start with an empty record and TypeScript needs to know the possible keys of this record, we can provide an empty object and assert its type to match Record<ActionType, Sprite | undefined>.
Here's how you can do it:
const [sprites, setSprites] = useState<Record<ActionType, Sprite | undefined>>({} as Record<ActionType, Sprite | undefined>);By using a type assertion as Record<ActionType, Sprite | undefined>, you're telling TypeScript that the empty object {} should be treated as a record with keys of ActionType and values that can be either Sprite or undefined. This should resolve the TypeScript error.