Angular 2 纯 js 与 webpack / systemjs
Angular 2 plain js vs webpack / systemjs
我们正在测试 Angular 2 在 Opera presto 平台 (12.51) 上的适用性。
我是 Angular 2 和 webpack 的新手,所以我很可能错过了一些明显的东西,或者我的理解/假设存在缺陷。
如果我按照本教程进行操作,我会注意到:
https://angular.io/docs/js/latest/quickstart.html
应用程序正确加载和运行。
但是如果我尝试使用本教程的 TypeScript 版本:
https://angular.io/docs/ts/latest/quickstart.html
应用程序加载失败,没有任何错误。
所以我做了一些研究,得出的结论是 SystemJs 远远超出了浏览器的能力范围。
在那之后我想我会尝试 webpack。所以一切都通过很好的链接和打包文件发送到浏览器,并且没有任何动态模块加载。
但是webpack版本报错:
Uncaught exception: TypeError: Cannot convert 'core_1.ViewEncapsulation' to object
Error thrown at line 36, column 4 in <anonymous function>():
ViewEncapsulationEnum.Emulated = ViewEncapsulationEnum.fromValue(core_1.ViewEncapsulation.Emulated);
called from line 30, column 0 in <anonymous function>():
var ViewEncapsulationEnum = (function () {
called from line 1371, column 1 in <anonymous function>(module, exports, __webpack_require__) in http://localhost:5000/vendor.js:
eval("\"use strict\";\nvar core_1 = __webpack_require__(79);\nvar core_private_1 = __webpack_require__(252);\nvar compile_metadata_1 = __webpack_require__(271);\nvar lang_1 = __webpack_require__(250);\nvar identifiers_1 = __webpack_require__(270);\nvar o = __webpack_require__(276);\nfunction _enumExpression(classIdentifier, value) {\n if (lang_1.isBlank(value))\n return o.NULL_EXPR;\n var name = lang_1.resolveEnumToken(classIdentifier.runtime, value);\n return o.importExpr(new compile_metadata_1.CompileIdentifierMetadata({\n name: classIdentifier.name + \".\" + name,\n moduleUrl: classIdentifier.moduleUrl,\n runtime: value\n }));\n}\nvar ViewTypeEnum = (function () {\n function ViewTypeEnum() {\n }\n ViewTypeEnum.fromValue = function (value) {\n return _enumExpression(identifiers_1.Identifiers.ViewType, value);\n };\n ViewTypeEnum.HOST = ViewTypeEnum.fromValue(core_private_1.ViewType.HOST);\n ViewTypeEnum.COMPONENT = ViewTypeEnum.fromValue(core_private_1.ViewType.COMPONENT);\n ViewTypeEnum.EMBEDDED = ViewTypeEnum.fromValue(core_private_1.ViewType.EMBEDDED);\n return ViewTypeEnum;\n}());\nexports.ViewTypeEnum = ViewTypeEnum;\nvar
我的理解是 webpack 会将所有依赖项一起解析并将它们捆绑在一起。
知道为什么我会在 web pack 中得到一个错误,而我在普通 JS 中却没有得到吗?
webpack.common.js
var webpack = require('webpack');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var helpers = require('./helpers');
module.exports = {
entry: {
'polyfills': './src/polyfills.ts',
'vendor': './src/vendor.ts',
'app': './src/main.ts'
},
resolve: {
extensions: ['', '.js', '.ts']
},
module: {
loaders: [
{
test: /\.ts$/,
loader: 'ts'
},
{
test: /\.html$/,
loader: 'html'
},
{
test: /\.(png|jpe?g|gif|svg|woff|woff2|ttf|eot|ico)$/,
loader: 'file?name=assets/[name].[hash].[ext]'
},
{
test: /\.css$/,
exclude: helpers.root('src', 'app'),
loader: ExtractTextPlugin.extract('style', 'css?sourceMap')
},
{
test: /\.css$/,
include: helpers.root('src', 'app'),
loader: 'raw'
}
]
},
plugins: [
new webpack.optimize.CommonsChunkPlugin({
name: ['app', 'vendor', 'polyfills']
}),
new HtmlWebpackPlugin({
template: 'src/index.html'
})
]
};
webpack.dev.js
var webpackMerge = require('webpack-merge');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var commonConfig = require('./webpack.common.js');
var helpers = require('./helpers');
module.exports = webpackMerge(commonConfig, {
devtool: 'cheap-module-eval-source-map',
output: {
path: helpers.root('dist'),
publicPath: 'http://localhost:5000/',
filename: '[name].js',
chunkFilename: '[id].chunk.js'
},
plugins: [
new ExtractTextPlugin('[name].css')
],
devServer: {
historyApiFallback: true,
stats: 'minimal'
}
});
tsconfig.json
{
"compilerOptions": {
"target": "es5",
"module": "commonjs",
"moduleResolution": "node",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"removeComments": false,
"noImplicitAny": true,
"suppressImplicitAnyIndexErrors": true
}
}
typings.json
{
"globalDependencies": {
"core-js": "registry:dt/core-js#0.0.0+20160317120654",
"jasmine": "registry:dt/jasmine#2.2.0+20160505161446",
"node": "registry:dt/node#6.0.0+20160613154055"
},
}
我们最终使用了 Backbone.js。它与 Presto 的兼容性要好得多,并且在低端 CPU 设备上表现更好。
此外,Angular 放弃对早期 Opera 浏览器的支持,从未来验证的角度来看,这是有意义的。
我们对结果非常满意。
我们正在测试 Angular 2 在 Opera presto 平台 (12.51) 上的适用性。
我是 Angular 2 和 webpack 的新手,所以我很可能错过了一些明显的东西,或者我的理解/假设存在缺陷。
如果我按照本教程进行操作,我会注意到:
https://angular.io/docs/js/latest/quickstart.html
应用程序正确加载和运行。
但是如果我尝试使用本教程的 TypeScript 版本: https://angular.io/docs/ts/latest/quickstart.html
应用程序加载失败,没有任何错误。
所以我做了一些研究,得出的结论是 SystemJs 远远超出了浏览器的能力范围。
在那之后我想我会尝试 webpack。所以一切都通过很好的链接和打包文件发送到浏览器,并且没有任何动态模块加载。
但是webpack版本报错:
Uncaught exception: TypeError: Cannot convert 'core_1.ViewEncapsulation' to object
Error thrown at line 36, column 4 in <anonymous function>():
ViewEncapsulationEnum.Emulated = ViewEncapsulationEnum.fromValue(core_1.ViewEncapsulation.Emulated);
called from line 30, column 0 in <anonymous function>():
var ViewEncapsulationEnum = (function () {
called from line 1371, column 1 in <anonymous function>(module, exports, __webpack_require__) in http://localhost:5000/vendor.js:
eval("\"use strict\";\nvar core_1 = __webpack_require__(79);\nvar core_private_1 = __webpack_require__(252);\nvar compile_metadata_1 = __webpack_require__(271);\nvar lang_1 = __webpack_require__(250);\nvar identifiers_1 = __webpack_require__(270);\nvar o = __webpack_require__(276);\nfunction _enumExpression(classIdentifier, value) {\n if (lang_1.isBlank(value))\n return o.NULL_EXPR;\n var name = lang_1.resolveEnumToken(classIdentifier.runtime, value);\n return o.importExpr(new compile_metadata_1.CompileIdentifierMetadata({\n name: classIdentifier.name + \".\" + name,\n moduleUrl: classIdentifier.moduleUrl,\n runtime: value\n }));\n}\nvar ViewTypeEnum = (function () {\n function ViewTypeEnum() {\n }\n ViewTypeEnum.fromValue = function (value) {\n return _enumExpression(identifiers_1.Identifiers.ViewType, value);\n };\n ViewTypeEnum.HOST = ViewTypeEnum.fromValue(core_private_1.ViewType.HOST);\n ViewTypeEnum.COMPONENT = ViewTypeEnum.fromValue(core_private_1.ViewType.COMPONENT);\n ViewTypeEnum.EMBEDDED = ViewTypeEnum.fromValue(core_private_1.ViewType.EMBEDDED);\n return ViewTypeEnum;\n}());\nexports.ViewTypeEnum = ViewTypeEnum;\nvar
我的理解是 webpack 会将所有依赖项一起解析并将它们捆绑在一起。
知道为什么我会在 web pack 中得到一个错误,而我在普通 JS 中却没有得到吗?
webpack.common.js
var webpack = require('webpack');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var helpers = require('./helpers');
module.exports = {
entry: {
'polyfills': './src/polyfills.ts',
'vendor': './src/vendor.ts',
'app': './src/main.ts'
},
resolve: {
extensions: ['', '.js', '.ts']
},
module: {
loaders: [
{
test: /\.ts$/,
loader: 'ts'
},
{
test: /\.html$/,
loader: 'html'
},
{
test: /\.(png|jpe?g|gif|svg|woff|woff2|ttf|eot|ico)$/,
loader: 'file?name=assets/[name].[hash].[ext]'
},
{
test: /\.css$/,
exclude: helpers.root('src', 'app'),
loader: ExtractTextPlugin.extract('style', 'css?sourceMap')
},
{
test: /\.css$/,
include: helpers.root('src', 'app'),
loader: 'raw'
}
]
},
plugins: [
new webpack.optimize.CommonsChunkPlugin({
name: ['app', 'vendor', 'polyfills']
}),
new HtmlWebpackPlugin({
template: 'src/index.html'
})
]
};
webpack.dev.js
var webpackMerge = require('webpack-merge');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var commonConfig = require('./webpack.common.js');
var helpers = require('./helpers');
module.exports = webpackMerge(commonConfig, {
devtool: 'cheap-module-eval-source-map',
output: {
path: helpers.root('dist'),
publicPath: 'http://localhost:5000/',
filename: '[name].js',
chunkFilename: '[id].chunk.js'
},
plugins: [
new ExtractTextPlugin('[name].css')
],
devServer: {
historyApiFallback: true,
stats: 'minimal'
}
});
tsconfig.json
{
"compilerOptions": {
"target": "es5",
"module": "commonjs",
"moduleResolution": "node",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"removeComments": false,
"noImplicitAny": true,
"suppressImplicitAnyIndexErrors": true
}
}
typings.json
{
"globalDependencies": {
"core-js": "registry:dt/core-js#0.0.0+20160317120654",
"jasmine": "registry:dt/jasmine#2.2.0+20160505161446",
"node": "registry:dt/node#6.0.0+20160613154055"
},
}
我们最终使用了 Backbone.js。它与 Presto 的兼容性要好得多,并且在低端 CPU 设备上表现更好。
此外,Angular 放弃对早期 Opera 浏览器的支持,从未来验证的角度来看,这是有意义的。
我们对结果非常满意。