Definitelytyped: Cannot find module 'source-map'

[Legends]

If you know how to fix the issue, make a pull request instead.

• [x] I tried using the @types/webpack | @types/html-webpack-pluginpackage and had problems.
• [x] I tried using the latest stable version of tsc. https://www.npmjs.com/package/typescript
• [x] [Mention](https://github.com/blog/821-mention-somebody-they-re-notified) the authors (see Definitions by: in index.d.ts) so they can respond.
  @tkqubo, @bumbleblym ,@deevus

"dependencies": {
    "@types/html-webpack-plugin": "^2.30.2",
    "@types/node": "^9.4.5",
    "@types/webpack": "^3.8.7"
  },
  "devDependencies": {
    "@types/jquery": "^3.3.0",
    "@types/lodash": "^4.14.102",
    "html-webpack-plugin": "^2.30.1",
    "jquery": "^3.3.1",
    "lodash": "^4.17.5",
    "ts-loader": "^3.5.0",
    "typescript": "^2.7.1",
    "webpack": "^3.11.0"
  },

This happens after installing the following package:

npm install @types/webpack
or this package:
npm install @types/html-webpack-plugin

PS C:\inetpub\wwwroot\WebPack_TypeScript_Setup_Example> tsc

node_modules//index.d.ts(9,32): error TS2307: Cannot find module 'source-map'.
node_modules//index.d.ts(20,30): error TS2307: Cannot find module 'source-map'.

@j-oliveras told me to try this:
npm install @types/[email protected]

Now I don't get these errors anymore, but if I install the latest version of source-map the problem returns !

[GabrielDuarteM]

Happened to me too, if I install the latest @types/source-map, i get the following errors:

ERROR in <PATH_TO_PROJECT>/node_modules/@types/uglify-js/index.d.ts(9,32):
TS2307: Cannot find module 'source-map'.
ERROR in <PATH_TO_PROJECT>/node_modules/@types/webpack/index.d.ts(20,30):
TS2307: Cannot find module 'source-map'.

if I install @types/[email protected], the problem goes away.

[DjangoFR]

The same problem here! Thank you @GabrielDuarteM

[Legends]

Any updates on this ? @rbuckton , @jvilk , adding @tkrotoff

I get this error constantly when creating a new project:

node_modules/@types/uglify-js/index.d.ts(9,32): error TS2307: Cannot find module 'source-map'.
node_modules/@types/webpack/index.d.ts(23,30): error TS2307: Cannot find module 'source-map'.

[jvilk]

source-map ships with its own types from 0.5.7 on.

Here's what I think will work, but have not tested:

• If your code depends directly on source-map version 0.5.7 or above (e.g. source-map is in your dependencies/devDependencies), then do not install @types/source-map; source-map ships with its own types.
• If your code does not directly depend on source-map, then I believe you should be able to either install @types/source-map or source-map to resolve the problem, but don't install both.

Does that help at all?

[kalupa]

I just tried to install source-map 0.5.7 and have the errors described. Perhaps it's a problem downstream with uglify and webpack types

[Legends]

Problem is fixed when installing: "source-map": "^0.7.2",

[GabrielDuarteM]

@Legends the issue still remains for me when installing "source-map": "^0.7.2". If I install just @types/[email protected] (just the typing, without the source-map package, as I don't use it anywhere) the problem goes away, but if I uninstall the types, the same error comes back.

[Legends]

Reopening the issue as @GabrielDuarteM still has problems...

[RikkiGibson]

Does it make sense to need to install the types for a module you don't directly depend on? Shouldn't @types/webpack just depend on it explicitly if it actually needs them?

[koichirokamoto]

The issue have raise when install latest version 0.5.7 of @types/source-map. 0.5.2 is ok.

[zeronight]

I fixed it like this:

1. install source-map

npm install source-map --save-dev

1. set moduleResolution to node in tsconfig.json

{
  "compilerOptions": {
    "moduleResolution": "node"
  }
}

[Legends]

@GabrielDuarteM Still an issue or can I close it?

[strongui]

@Legends I'm still having the issue.

[JalilArfaoui]

I'm having the same issue too.

yarn add --dev @types/[email protected] fixes it like @GabrielDuarteM said

[retorquere]

Same here -- npm install --save --dev @types/[email protected] worked for me.

[mirismaili]

Thank @zeronight.

tsc [...] --moduleResolution node

worked.

In my case, there was no need to neither source-map nor @types/source-map.

[lcpautotester]

Same here -- npm install --save --dev @types/[email protected] worked for me.

this fixed it for me , too. why isnt this fixed by now??

[juwaki]

after upgrading to angular 9

i did npm install --save --only=dev @types/[email protected]

and the error didnt go away,

Solution
ended up removing --save --only=dev and did

npm install @types/[email protected]

which worked perfectly