【发布时间】：2017-10-17 10:14:26
【问题描述】：
我正在尝试使用 webpack 3 和 rxjs5 运行一个简单的 typescript 项目，但出现错误。
app.ts：
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/of';
const myObservable: any = Observable.of(1, 2, 3)
.subscribe(
(value: any) => console.log(value),
(err: any) => console.log(err),
() => console.log("Streaming is over")
);
index.html：
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Webpack 3 with Typescript</title>
</head>
<body>
<h1>Let's learn Webpack 3</h1>
<script src="dist/bundle.js"></script>
</body>
</html>
package.json：
{
"name": "ObservablesProject2",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"build": "webpack-dev-server",
"build:prod": "webpack -p"
},
"keywords": [],
"author": "",
"license": "ISC",
"devDependencies": {
"ts-loader": "^3.0.2",
"tslint": "^5.7.0",
"tslint-loader": "^3.5.3",
"typescript": "^2.5.3",
"webpack": "^3.7.1",
"webpack-dev-server": "^2.9.2"
},
"dependencies": {
"rxjs": "^5.4.3"
}
}
tsconfig.json：
{
"compilerOptions": {
/* Basic Options */
"target": "es5", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', or 'ESNEXT'. */
"module": "commonjs", /* Specify module code generation: 'none', commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
"lib": ["es6", "dom"], /* Specify library files to be included in the compilation: */
"allowJs": true, /* Allow javascript files to be compiled. */
// "checkJs": true, /* Report errors in .js files. */
// "jsx": "preserve", /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
// "declaration": true, /* Generates corresponding '.d.ts' file. */
"sourceMap": true, /* Generates corresponding '.map' file. */
// "outFile": "./", /* Concatenate and emit output to single file. */
// "outDir": "./", /* Redirect output structure to the directory. */
// "rootDir": "./", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
// "removeComments": true, /* Do not emit comments to output. */
// "noEmit": true, /* Do not emit outputs. */
// "importHelpers": true, /* Import emit helpers from 'tslib'. */
// "downlevelIteration": true, /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
// "isolatedModules": true, /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
/* Strict Type-Checking Options */
"strict": true, /* Enable all strict type-checking options. */
"noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */
"strictNullChecks": true /* Enable strict null checks. */
// "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */
// "alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */
/* Additional Checks */
// "noUnusedLocals": true, /* Report errors on unused locals. */
// "noUnusedParameters": true, /* Report errors on unused parameters. */
// "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */
// "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */
/* Module Resolution Options */
// "moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
// "baseUrl": "./", /* Base directory to resolve non-absolute module names. */
// "paths": {}, /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
// "rootDirs": [], /* List of root folders whose combined content represents the structure of the project at runtime. */
// "typeRoots": [], /* List of folders to include type definitions from. */
// "types": [], /* Type declaration files to be included in compilation. */
// "allowSyntheticDefaultImports": true, /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
// "preserveSymlinks": true, /* Do not resolve the real path of symlinks. */
/* Source Map Options */
// "sourceRoot": "./", /* Specify the location where debugger should locate TypeScript files instead of source locations. */
// "mapRoot": "./", /* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */
// "inlineSources": true, /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
/* Experimental Options */
// "experimentalDecorators": true, /* Enables experimental support for ES7 decorators. */
// "emitDecoratorMetadata": true, /* Enables experimental support for emitting type metadata for decorators. */
},
"exclude": [
"node_modules"
]
}
webpack.config.js：
var path = require('path');
var webpack = require('webpack');
module.exports = {
entry: './src/js/app.ts',
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'bundle.js',
publicPath: '/dist'
},
module: {
rules: [
{
enforce: 'pre',
test: /\.tsx?$/,
loader: 'tslint-loader',
exclude: /node_modules/,
options: {
failOnHint: true,
configuration: require('./tslint.json')
}
},
{
test: /\.tsx?$/,
use: 'ts-loader',
exclude: /node_modules/
}
]
},
resolve: {
extensions: [".tsx", ".ts", ".js"]
},
plugins: [
new webpack.optimize.UglifyJsPlugin({
// ...
})
]
};
我尝试编译上述代码时遇到的错误如下：
ERROR in ./src/js/app.ts
[tsl] ERROR in /Users/administrator/WebstormProjects/ObservablesProject2/src/js/app.ts(1,28)
TS7016: Could not find a declaration file for module 'rxjs/Observable'. '/Users/administrator/WebstormProjects/ObservablesProject2/node_modules/rxjs/Observable.js' implicitly has an 'any' type.
Try `npm install @types/rxjs/Observable` if it exists or add a new declaration (.d.ts) file containing `declare module 'rxjs/Observable';`
【问题讨论】：
-
尝试使用
(value: number) => console.log(value)。注意: number类型说明符。 -
@IgorSoloydenko 我相信这是一个配置错误。语法上我的代码是好的。你可以使用 any 来表示任何类型，包括数字。
-
知道了。我想你是对的。你可以做的是暂时禁用这个东西：
"noImplicitAny": true。在您进行实验时，请使用false原谅您。如果在使用"noImplicitAny": false代码后，您知道要查找什么，但我不确定在哪里 -- 在您的代码或 RxJs 中...试一试。 -
@IgorSoloydenkoI 我已经尝试过了，但我必须重申这是一个配置错误。
-
Tsconfig 也是你配置的一部分
标签： javascript typescript rxjs webstorm rxjs5