Question

我正在将Node + ES6项目转换为TypeScript。我的目标是ES6（因为我正在运行Node 7.x）并使用Map。

运行tsc -p会返回：

src/actions.ts(3,9): error TS2451: Cannot redeclare block-scoped variable 'events'
src/calendar.ts(5,10): error TS2300: Duplicate identifier 'fetchEvents'.
src/index.ts(3,5): error TS2403: Subsequent variable declarations must have the same type. Variable 'actions' must be of type 'Map<any, any>', but here has type 'any'.

目前尚不清楚为什么这些是重复的标识符或被标记为重新声明，特别是在Node的require / module导入的上下文中。在require语句中使用标准const更严重地打破了这一点。

calendar.ts

const { rp } = require("request-promise")

var events = <any> {}

// both are exported via module.exports = { events, fetchEvents }
function fetchEvents(key: string, url: string, options: object) {
    ...

actions.ts

const moment = require("moment")
var { events, fetchEvents } = require("./calendar")

var actions = new Map()

tsconfig.json

{
  "compilerOptions": {
    "target": "es6",
    "outDir": "./built",
    "declaration": true,
    "rootDir": ".",
    "baseUrl" : "./packages",
    "experimentalDecorators": true,
    "moduleResolution": "node",
    "noImplicitAny": false,
    "strictNullChecks": true,
    "noImplicitReturns": true,
    "noImplicitThis": true
  },
  "include": [
    "src/**/*"
  ],
  "exclude": [
    "dist",
    "node_modules",
    ".vscode"
  ]
}

Answer 1

不确定var {...构造是否有效。 var使变量作用域类型为全局。

如果您在 actions.ts ：

中使用该怎么办？

const moment = require("moment")
import calendar = require("./calendar");
// console.log(calendar.events)

node + TypeScript：无法重新声明块范围变量'events'

1 个答案: