无法在 javascript 中“转换”打字稿定义

Posted 2023-03-10

【中文标题】无法在 javascript 中“转换”打字稿定义

【英文标题】：can't 'convert' typescript definition in javascript

【发布时间】：2021-08-11 07:11:38

【问题描述】：

我正在尝试将 this Apollo typescript repository 重写为 javascript。 我尝试学习打字稿，但有一件事叫做“类型转换”或“类型断言”，这让我感到困惑。

让我用代码解释一下：

//cache.tsx

import  InMemoryCache, ReactiveVar, makeVar  from "@apollo/client";
import  Todos  from "./models/Todos";
import  VisibilityFilter, VisibilityFilters  from "./models/VisibilityFilter";

export const cache...
...
...



export const todosVar: ReactiveVar<Todos> = makeVar<Todos>( //how i can 'convert' this type caster value to vanilla js?
  todosInitialValue 
);

export const visibilityFilterVar = makeVar<VisibilityFilter>(  //how i can 'convert' this type caster value to vanilla js?
  VisibilityFilters.SHOW_ALL
)

此 cache.tsx 使用的其他 2 个文件是：

//todos.tsx

export interface Todo 
  text: string;
  completed: boolean;
  id: number


export type Todos = Todo[];

和

VisibilityFilter.tsx

export type VisibilityFilter = 
  id: string;
  displayName: string;


export const VisibilityFilters:  [filter: string]: VisibilityFilter  = 
  SHOW_ALL: 
    id: "show_all",
    displayName: "All"
  ,
  SHOW_COMPLETED: 
    id: "show_completed",
    displayName: "Completed"
  ,
  SHOW_ACTIVE: 
    id: "show_active",
    displayName: "Active"
  

在这种情况下如何避免 typescript 类型检查，更重要的是，如何正确使用 ReactiveVar 和 makeVar 导入？

【参考方案1】：

只需像这样删除泛型：

发件人：

makeVar<Todos>(

收件人：

makeVar(

改变这个：

export const todosVar: ReactiveVar<Todos> = makeVar<Todos>( //how i can 'convert' this type caster value to vanilla js?
  todosInitialValue 
);

export const visibilityFilterVar = makeVar<VisibilityFilter>(  //how i can 'convert' this type caster value to vanilla js?
  VisibilityFilters.SHOW_ALL
)

到这里：

export const todosVar = makeVar(todosInitialValue);
export const visibilityFilterVar = makeVar(VisibilityFilters.SHOW_ALL);

如何避免 typescript 检查 - 将扩展名从 .ts 和 .tsx 分别替换为 .js 和 .jsx。