grunt-karma ^2.0.0 does NOT use [email protected] and it breaks

Question

When installing grunt-karma npm install grunt-karma --save-dev it install karma^1.0.0 with it. And that breaks the tests:

Warning: .then() only accepts functions but was passed: [object Undefined], [object Undefined]...

It's true that while installing grunt-karma I get the following npm WARN message:

npm WARN peerDependencies The peer dependency grunt@>=0.4.x included from grunt-karma will no npm WARN peerDependencies longer be automatically installed to fulfill the peerDependency npm WARN peerDependencies in npm 3+. Your application will need to depend on it explicitly. npm WARN peerDependencies The peer dependency karma@^0.13.0 || >= 0.14.0-rc.0 included from grunt-karma will no npm WARN peerDependencies longer be automatically installed to fulfill the peerDependency npm WARN peerDependencies in npm 3+. Your application will need to depend on it explicitly. npm WARN optional dep failed, continuing [email protected]

But my npm version is 2.14.20

Answer 1

This is what gets installed:

[email protected] node_modules\grunt
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected] ([email protected])
├── [email protected]
├── [email protected]
├── [email protected] ([email protected], [email protected], [email protected], [email protected])
├── [email protected] ([email protected])
├── [email protected] ([email protected])
├── [email protected] ([email protected])
├── [email protected] ([email protected], [email protected])
├── [email protected] ([email protected], [email protected])
├── [email protected] ([email protected], [email protected], [email protected], [email protected], [email protected])
└── [email protected] ([email protected], [email protected], [email protected], [email protected], [email protected], [email protected])

[email protected] node_modules\karma   <-- here is the issue 
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected] ([email protected], [email protected])
├── [email protected]
├── [email protected] ([email protected], [email protected], [email protected], [email protected])
├── [email protected] ([email protected], [email protected], [email protected], [email protected], [email protected])
├── [email protected] ([email protected])
├── [email protected] ([email protected])
├── [email protected] ([email protected])
├── [email protected]
├── [email protected] ([email protected], [email protected], [email protected], [email protected])
├── [email protected] ([email protected], [email protected])
├── [email protected] ([email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected])
├── [email protected] ([email protected], [email protected], [email protected])
├── [email protected] ([email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected])
├── [email protected] ([email protected], [email protected], [email protected], [email protected], [email protected], [email protected])
├── [email protected] ([email protected], [email protected])
├── [email protected]
├── [email protected] ([email protected])
└── [email protected]

[email protected] node_modules\grunt-karma
└── [email protected]

The solution is simply install the the version that grunt-karma needs according to the docs:

This current version uses karma`@0.13.x ...

Although it the tables it seems to depend of different versions of karma for devDependencies(1.x || ^0.13.0) and peerDependencies(^0.13.0 || >= 0.14.0-rc.0)

So, to fix it you have to manually install the right version of karma until the issue is fixed:

npm install [email protected]