英文:
Property does not exist on type (2339)
问题
我遇到了 TypeScript 错误 Property 'UPDATE_COLUMNS' does not exist on type 'DimensionAction'.ts(2339) 即使你可以看到它在上面被定义了。
我在使用 VSCode。我想知道这是否是我的 IDE 的一个 bug。我已经运行了 yarn lint，代码中其他地方的语法都完全正常。
export enum DimensionAction {
UPDATE_ROWS = 'update_rows',
UPDATE_COLUMNS = 'update_columns',
}
const dimensionReducer = (state: Dimension, action: DimensionAction): void => {
switch (action) {
case DimensionAction.UPDATE_COLUMNS:
break;
case DimensionAction.UPDATE_ROWS:
break;
default:
throw Error('Must pass action');
}
}
为什么这段代码不是有效的 TypeScript 代码？
英文:
I'm getting the typescript error Property 'UPDATE_COLUMNS' does not exist on type 'DimensionAction'.ts(2339) Even though you can see it is defined right above.
I'm using VSCode. I'm wondering if this is a bug with my IDE. I've run yarn lint and the syntax everywhere else in my code is totally fine.
export enum DimensionAction {
UPDATE_ROWS = 'update_rows',
UPDATE_COLUMNS = 'update_columns',
}
const dimensionReducer = (state: Dimension, action: DimensionAction): void => {
switch (action) {
case action.UPDATE_COLUMNS:
break
case action.UPDATE_ROWS:
break
default:
throw Error('Must pass action')
}
}
Why isn't this code valid Typescript?
答案1
得分: 1
你应该在枚举类型本身上访问特定的枚举。
英文:
You should access the specific enumeration on the enum type itself.
case DimensionAction.UPDATE_COLUMNS:
Also, there is no need for a separate case for UPDATE_ROWS; it can just be handled in default. action: DimensionAction does not allow for action to be null, undefined, or anything other than one of the DimensionAction enum values.
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