如何获得NPM模块以正确安装其依赖项？

Question

I'm having problems with my home-rolled NPM module as when installed it installs most of it's dependencies in the applications node_modules directory, instead of containing it inside the module itself.

Ex;

APP
    node_modules
        MY_MODULE
            node_modules
                <ALL deps from MY_MODULE should be installed here>
        <SOME/MOST deps from MY_MODULE are installed here>

The above causes issues because I have dependencies that require a specific version that's installed under MY_MODULE/node_modules and NOT under MY_APP/node_modules.

For instance; I have Webpack 3 installed under APP/node_modules but MY_MODULE requires Webpack 4 and that is installed under MY_MODULE/node_modules as you would expect. But everything else, that requires Webpack 4, is installed under APP/node_modules and thus gives an error message.

So, in the app I have a package.json: devDependencies: "webpack": "^3.12.0",

And in my NPM module I have a package.json: "dependecies": [ "webpack": "^4.12.0", "webpack-cli": "^3.0.8", ]

webpack-cli is installed under APP/node_modules and thus complains that it requires Webpack 4 and that it couldn't be found.

if webpack-cli instead installed itself under APP / node_modules / MY_MODULE / node_modules it would work.

How can I get it to do that?

Thanks,

/J

Answer 1

<ALL deps from MY_MODULE should be installed here>

They shouldn't. This was true for NPM v2. This behaviour had been changed in NPM v3, and now it's v6.

In case dependencies have dependencies with different version constraints that can be satisfied with single webpack (which is one of the reasons why node_modules was flattened in NPM v3), there will be:

node_modules/webpack

Otherwise there will be multiple dependencies that will be used by packages that depend on them:

node_modules/webpack@3.12.0
node_modules/webpack@4.12.0