如果不直接使用,导出的TypeScript类不包含在WebPack包中

时间:2016-02-19 11:53:25

标签: javascript typescript webpack ts-loader

我将使用Angular 1.x的javascript项目转换为WebPack和TypeScript(使用ts-loader)。我得到它主要工作,但是当ts-loader似乎是在未直接使用导出时优化我的脚本时,我遇到了麻烦。

这是一个展示问题的示例项目(npm install,webpack,然后加载index.html并观察控制台)。

https://github.com/bbottema/webpack-typescript

显示来自ClassA的日志记录,但angular报告缺少ClassB(提供程序)。如果你查看bundle.js,你会发现ClassB完全丢失了。不同之处在于ClassA在导入后直接开始使用,而ClassB仅由类型引用进行编译。

这是一个错误,还是有办法强制包含ClassB?或者我错了吗? Angular 2可能会解决这个问题,但现在这个步骤太大了。

上述项目的相关脚本:

的package.json

{
    "devDependencies": {
        "typescript": "^1.7.5",
        "ts-loader": "^0.8.1"
    },
    "dependencies": {
        "angular": "1.4.9"
    }
}

webpack.config.js

var path = require('path');

module.exports = {
    entry: {
        app: './src/entry.ts'
    },
    output: {
        filename: './dist/bundle.js'
    },
    resolve: {
        root: [
            path.resolve('./src/my_modules'),
            path.resolve('node_modules')
        ],
        extensions: ['', '.ts', '.js']
    },
    module: {
        loaders: [{
            test: /\.tsx?$/,
            loader: 'ts-loader'
        }]
    }
};

tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs"
  },
  "exclude": [
    "node_modules"
  ]
}

的index.html

<!doctype html>
<html ng-app="myApp">
    <body>
        <script src="dist/bundle.js"></script>
    </body>
</html>

entry.js

declare var require: any;

'use strict';

import ClassA = require('ClassA');
import ClassB = require('ClassB');

var a:ClassA = new ClassA(); // direct use, this works

var angular = require('angular');

angular.module('myApp', []).
    // this compiles as it should, but in runtime the provider will not be packaged and angular will throw an error
    run(function(myProvider: ClassB) {
    }
);

ClassA.ts

// this line will be logged just fine
console.log('ClassA.ts: if you see this, then ClassA.ts was packaged properly');

class ClassA {
}

export = ClassA;

ClassB.ts

declare var require: any;

// this line is never logged
console.log('ClassB.ts: if you see this, then ClassB.ts was packaged properly');

class ClassB {
}

var angular = require(angular);

angular.module('myApp').service(new ClassB());

export = ClassB;

1 个答案:

答案 0 :(得分:1)

Turns out you have to signal WebPack通过在没有require声明的情况下添加额外import次来明确包含模块。

我还没准备好通过添加重复的导入来破坏我的.ts文件,所以我使用preprocessor loader为它做了一个通用的解决方案:

{
    "line": false,
    "file": true,
    "callbacks": {
    "fileName": "all",
    "scope": "line",
    "callback": "(function fixTs(line, fileName, lineNumber) { return line.replace(/^(import.*(require\\(.*?\\)))/g, '$2;$1'); })"
    }]
}

作为概念证明,此正则表达式版本非常有限,它仅支持以下格式:

import ClassA = require('ClassA');
// becomes
require('ClassA');import ClassA = require('ClassA');

但它对我有用。同样,我正在添加require shim

{
    "fileName": "all",
    "scope": "source",
    "callback": "(function fixTs(source, fileName) { return 'declare var require: any;' + source; })"
}

我使用此解决方案制作了sample project