Lodash - '_' refers to a UMD global and lodash.js is not a module errors

问题:

If I do nothing and add the type definition it works for jquery but lodash gets a

'_' referes to a UMD global, but the current file is a module. Consider adding an import instead.

If I try to import lodash with any combination of import call, I get

lodash.js is not a module

I tried to get help by asking a question here and it was closed because there was another answer for Angular (Angular 2). I really need a real answer so I'm re-posting with my own solutions, hoping someone will eventually help me understand this problem.

In this case I am:

1. Not using any frameworks like Angular
2. Using TypeScript
3. Using requirejs to import modules
4. Using Visual Studio
5. Using MVC5

回答1:

I added following code in my global typing definition file (~\src\typings.d.ts) to fix the problem. I'm using Angular CLI 1.7

// lodash global typing - begin declare namespace _ { } // lodash global typing - end 

回答2:

I added in my ~\src\typings.d.ts :

declare const _; 

It works for me. See also

回答3:

I use import * as _ from 'lodash'; in my working file after installing lodash.

回答4:

'_' referes to a UMD global, but the current file is a module. Consider adding an import instead.

This is caused by the type definition. Go into your @types/lodash file and delete these lines:

export = _; export as namespace _; 

This will solve the error.

***EDIT****

Removing the export statements above will cause another error if you have any global declarations in your type definition file, for example, like this:

declare global { } 

To solve this, either move the properties from the global declaration to the interfaces that reference them - or delete them entirely and change the types of the references to something generic. I'm not sure which solution will make a better final compilation but the former has not caused any problems in my application as far back as IE11.

文章来源: Lodash - '_' refers to a UMD global and lodash.js is not a module errors