typescript 错误 TS2403：后续变量声明必须具有相同的类型
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error TS2403: Subsequent variable declarations must have the same type
提问by Andi Giga
Error
错误
I'm getting this typescript error:
我收到此打字稿错误：
error TS2403: Subsequent variable declarations must have the same type. Variable 'environment' must be of type 'string', but here has type 'any'.
错误 TS2403：后续变量声明必须具有相同的类型。变量 'environment' 必须是 'string' 类型，但这里的类型是 'any'。
Code
代码
package.json
包.json
...
"typescript": "^1.8.10",
...
server.ts
服务器.ts
var environment = require('./config/config.js')()
./config/config.ts
./config/config.ts
module.exports = function(): string {
//Environment
let env:string = process.env.NODE_ENV || 'development'
return env
}
Question:
问题：
What do I need to do, to get the return value of the function recognized as a string?
我需要做什么才能获得识别为 a 的函数的返回值string？
Edit
编辑
tsconfig
配置文件
{
"compilerOptions": {
"target": "ES5",
"module": "system",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"moduleResolution": "node",
"removeComments": false,
"noImplicitAny": true,
"suppressImplicitAnyIndexErrors": true
},
"exclude": [
"node_modules",
"typings/main",
"typings/main.d.ts"
]
}
Installation of node
安装节点
I added a typings.jsonwith
我加了一个typings.json用
{
"globalDependencies": {
"core-js": "registry:dt/core-js#0.0.0+20160602141332",
"jasmine": "registry:dt/jasmine#2.2.0+20160621224255",
"node": "registry:dt/node#6.0.0+20160621231320"
}
}
And as I remember uses tsd install. I have a folder called typings, In that folder is another folder called nodewith an index.d.ts. I assume this is the same as a node.d.ts?
我记得使用tsd install. 我有一个文件夹，名为typings，在该文件夹被称为另一个文件夹node用index.d.ts。我认为这与 a 相同node.d.ts？
Edit 2
编辑 2
gulp for frontend (angularjs) and backend (nodejs)
前端（angularjs）和后端（nodejs）的gulp
const gulp = require('gulp');
const gutil = require('gulp-util');
const paths = gulp.paths;
var $ = require('gulp-load-plugins')();
const tscConfig = require('../tsconfig.json');
gulp.task('scripts-frontend', function () {
gulp.src(paths.src + '/systemjs.config.js')
.pipe(gulp.dest(paths.out + '/'));
return gulp.src([paths.src + '/frontend/**/*.ts', paths.typings + '/**/*', '!' + paths.src + '/**/*.spec.ts'])
.pipe($.sourcemaps.init())
.pipe($.typescript(tscConfig.compilerOptions))
.pipe($.sourcemaps.write('.'))
.pipe(gulp.dest(paths.out + '/frontend/'));
});
gulp.task('scripts-backend', function () {
return gulp.src([paths.src + '/backend/**/*.ts', paths.typings + '/**/*', paths.src + '/server.ts', '!' + paths.src + '/**/*.spec.ts'])
.pipe($.sourcemaps.init())
.pipe($.typescript(tscConfig.compilerOptions))
.pipe($.sourcemaps.write('.'))
.pipe(gulp.dest(paths.out + '/backend/'));
});
回答by basarat
I see that your file extensions are .ts(e.g. config.ts). Don't use var/requirein ts files! This is especially true for bringing in other tsfiles.
我看到您的文件扩展名是.ts（例如config.ts）。不要var/require在 ts 文件中使用！对于引入其他ts文件尤其如此。
var environment = require('./config/config.js')()should be:
var environment = require('./config/config.js')()应该：
import config = require('./config/config.js');
const environment = config();
And module.exports = function(): string {should be :
并且module.exports = function(): string {应该是：
export = function(): string {
More
更多的
https://basarat.gitbooks.io/typescript/content/docs/project/external-modules.html
https://basarat.gitbooks.io/typescript/content/docs/project/external-modules.html
