[Bug]: Errors when using builtin webpack plugins

[titanous]

What happened?

I'm trying to use a built-in webpack plugin, for example:

const { SourceMapDevToolPlugin } = require('webpack');

module.exports = {
    devtool: false,
    plugins: [new SourceMapDevToolPlugin({})],
}

and I get one of two errors depending on whether I include webpack as a dependency in the configuration:

[webpack-cli] Error: Cannot find module 'webpack'

[webpack-cli] TypeError: The 'compilation' argument must be an instance of Compilation

Version

Development (host) and target OS/architectures:

Output of bazel --version:

bazel 6.0.0

Version of the Aspect rules, or other relevant rules from your
WORKSPACE or MODULE.bazel file:

rules_webpack v0.7.0

How to reproduce

Full repro workspace here of every variant I tried: https://github.com/titanous/rules_webpack_require_error

Any other information?

No response

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[thesayyn]

I know why this happens and is expected behavior; webpack in brought in via external repository which has its own npm_link_all_packages which links hermetically downloaded webpack next to webpack bin. by design this node_modules folder is not visible to other repositories which would be yours in this case.

you need to also link the hermetically downloaded webpack into your package to successfully resolve the same version of webpack.

load("@webpack//:npm_link_all_packages.bzl", "npm_link_all_packages")
npm_link_all_packages(name = "node_modules")

webpack(
   data = [":node_modules/webpack"]
)