webpack 4和d3 es6导入无效

Question

我正在尝试使用webpack4捆绑基于d3的客户端应用程序。但是，当捆绑代码时，会产生以下错误：

/* Cannot get final name for export "default" in "./node_modules/d3-selection/index.js" 
(known exports: , known reexports: create creator local matcher mouse namespace namespaces 
clientPoint select selectAll selection selector selectorAll style touch touches 
window event customEvent) */
undefined.select('body')
  .append('canvas')
  .attr('id', 'mycanvas')
  .attr('width', 640)
  .attr('height', 480);

在我的来源中我有

import selection from 'd3-selection';
selection.select('body')
  .append('canvas')
  .attr('id', 'mycanvas')
  .attr('width', 640)
  .attr('height', 480);

我不确定这是否是一个相关症状但是当我尝试import selection as d3sel from 'd3-selection';时，我从webpack收到一条关于无法声明该声明的错误。

我的package.json文件如下：

"devDependencies": {
  "d3-selection": "^1.3.0",
  "webpack": "^4.10.2",
  "webpack-cli": "^3.0.2"
}

Answer 1

也许选择不是默认导出？

尝试

import { selection } from 'd3-selection';