typescript 打字稿中的导入与需要
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Import vs Require in Typescript
提问by refactor
While I was going through Angular2 documentation, I came across below code in here.
当我浏览 Angular2 文档时，我在这里遇到了下面的代码。
src/polyfills.ts
src/polyfills.ts
import 'core-js/es6';
import 'core-js/es7/reflect';
require('zone.js/dist/zone');
if (process.env.ENV === 'production') {
// Production
} else {
// Development
Error['stackTraceLimit'] = Infinity;
require('zone.js/dist/long-stack-trace-zone');
}
In the above code we can see that there are both importand requirestatements.
在上面的代码中，我们可以看到有importandrequire语句。
"core-js" and "zone.js" are both node modules.
“core-js”和“zone.js”都是节点模块。
My question is; why is importused for core-js and requirefor "zone.js", is there any specific reason for this?
我的问题是；为什么import用于 core-js 和require“zone.js”，这有什么具体原因吗？
回答by James Monger
With TypeScript, importcan be used if there is a declaration file (see Declaration Files in basarat's book) for the module.
import如果有模块的声明文件（请参阅basarat 书中的声明文件），则可以使用TypeScript 。
If there isn't a declaration file, the TypeScript compiler doesn't know if the module exists, so you need to use requireinstead which lacks the compilation checking.
如果没有声明文件，TypeScript 编译器不知道该模块是否存在，因此您需要使用require缺少编译检查的代替。
