Issue with NPM: Unable to locate the reference to 'Many' and the namespace '_' from the lodash library

I've been incorporating lodash into my angular2 project. Here are the commands I used:

$ npm install --save lodash

$ npm install --save @types/lodash

Upon installing lodash, warning messages popped up for both the main library and the types: https://i.stack.imgur.com/bz9aN.png

And a similar situation occurred with the types: https://i.stack.imgur.com/OtkCp.png

Despite these warnings, I proceeded with the installation. In my component file, I included this line:

import * as _ from 'lodash';

However, upon compiling the app, the console returned a series of errors:

ERROR in [default] /path/to/project/node_modules/@types/lodash/index.d.ts:244:12
Duplicate identifier '_'.

    ERROR in [default] /path/to/project/node_modules/@types/lodash/index.d.ts:244:15
Cannot find namespace '_'.
 
...

     (Additional error log truncated for brevity)

...

    ERROR in [default] /path/to/project/node_modules/@types/lodash/index.d.ts:19441:0
Declaration or statement expected.

package.json

{
  "name": "final-project",
  "version": "0.0.0",
  "license": "MIT",
  ...

My question is, am I overlooking something important here? Is there a requirement to address the PEER DEPENDENCIES? And if so, how should I go about it?

angulartypescriptnpmlodashnpm-install

Answer №1

Currently, the most recent version of lodash utilizes typescript 2.1, however, this is not compatible with Ionic at the moment as Ionic still relies on ts 2.0. In my specific package.json file, I have specified:

"typescript": "2.0.10"

If you encounter the same issue while using the identical version as mine, simply execute the following command:

$ npm install --save lodash

Add the following to your dependencies section in the package.json file:

"dependencies": {
    ...
    "@types/lodash": "ts2.0"
}

Then run:

$ npm install

After completing these steps, you can now import lodash like so:

import * as _ from "lodash";

Answer №2

After encountering a similar issue, I took to the internet for solutions and stumbled upon a helpful comment at this link. By installing typescript 2.0 compatible types, my problem was resolved. Simply add "@types/lodash": "ts2.0" to your package.json.

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