【发布时间】：2020-08-14 20:37:51
【问题描述】：
我正在尝试使用使用 webpack 和 babel 编译的 typescript 项目中的https://github.com/timmywil/panzoom。
问题在于打字稿方法调用：
import Panzoom from '@panzoom/panzoom';
Panzoom(document.querySelector("#pic"));
被转译为以下javascript：
panzoom_1.default(document.querySelector("#pic"));
然后生成以下运行时错误：
Uncaught TypeError: panzoom_1.default is not a function
如果我调试 javascript，则 panzoom_1 具有预期的函数签名，但它没有 default 成员。
这是无数不同类型的模块、默认导出以及 babel 和 typescript 如何导入它们的差异之间的某种类型的问题，但我完全迷失了。根据文档，panzoom 是一个 UMD 模块，如果有帮助的话。
我找到了一种解决方法，可以以不同的方式导入，然后将其转换为任何方式，但这显然很疯狂，对吗？：
import * as Panzoom from '@panzoom/panzoom';
(<any>Panzoom)(document.querySelector("#pic"));
这里是项目配置：
test.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<img src="pic.jpg" id="pic" />
</body>
<script src="dist/bundle.js" type = "text/javascript"></script>
</html>
test.ts
import Panzoom from '@panzoom/panzoom';
Panzoom(document.querySelector("#pic"));
tsconfig.json
{
"compilerOptions": {
"outDir": ".",
"sourceMap": false,
"noImplicitAny": true,
"suppressImplicitAnyIndexErrors": true,
"module": "commonjs",
"target": "es6",
"jsx": "react",
"allowSyntheticDefaultImports": true,
"traceResolution": true,
"experimentalDecorators": true,
"baseUrl": ".",
}
}
package.json
{
"name": "grr",
"version": "0.0.0",
"private": true,
"dependencies": {
"@babel/polyfill": "^7.8.7",
"@panzoom/panzoom": "^4.1.0",
"npm-update-all": "^1.0.1",
"webpack": "^4.43.0",
"webpack-cli": "^3.3.11"
},
"devDependencies": {
"@babel/cli": "^7.8.4",
"@babel/core": "^7.9.6",
"@babel/plugin-proposal-class-properties": "^7.8.3",
"@babel/plugin-proposal-object-rest-spread": "^7.9.6",
"@babel/plugin-transform-async-to-generator": "^7.8.3",
"@babel/preset-env": "^7.9.6",
"@babel/preset-react": "^7.9.4",
"@babel/preset-typescript": "^7.9.0",
"awesome-typescript-loader": "^5.2.1",
"babel-loader": "^8.1.0",
"typescript": "^3.8.3"
}
}
webpack.config.js
var webpack = require("webpack");
var path = require('path');
module.exports = (env, options) => {
var PROD = (options.mode === 'production');
return {
entry: [
"@babel/polyfill",
path.resolve(__dirname, "test.ts")
],
output: {
filename: "bundle.js",
libraryTarget: "var"
},
resolve: {
modules: [
'node_modules'
],
extensions: [".ts", ".tsx", ".js", ".json"]
},
module: {
rules: [
{
test: /\.tsx?$/,
loaders: [
{
loader: 'babel-loader',
options:
{
compact: false,
presets: [
[
"@babel/preset-env",
{
targets: "> 0.25%, not dead"
}
]
]
}
},
'awesome-typescript-loader'
]
}
]
},
devtool : false,
optimization: {
minimize: PROD
}
}
};
.babelrc
{
"presets": ["@babel/env"],
"plugins": ["@babel/transform-async-to-generator"],
"compact":false
}
【问题讨论】：
-
试试
import Panzoom from '@panzoom/panzoom'; -
啊抱歉，我已经更正了这个问题，这确实是我最初的尝试。
-
这似乎是一个 babel 配置问题。您能否提供一个演示该问题的 stackblitz 示例？
-
@Eldar 我不认为 stackblitz 支持 webpack/babel - 必要的配置文件在问题中
标签： javascript typescript webpack babeljs