fix(node): Correctly resolve module name

[timfish]

Closes #10000

• Caches the basePath so dirname(require.main.filename) only gets called once
• Now uses full path for module name
• Now correctly handles inside node_modules
• Add more tests

[mydea]

l: This is not really related to this PR, but it would be nice to have a comment explaining what & why we actually do here - e.g. why use require.main.filename over global.process.cwd() etc. Feel free to ignore this, but as somebody with little to no historical context on this, this appears very magic to me 😅

[timfish]

I have no idea other than this has been like this for 11+ years from raven-node:
https://github.com/getsentry/raven-node/blame/7019cb30efda40704105b7b510bc428ec0c1ee01/lib/utils.js#L87

[timfish]

It is a good point though which is worth considering as it will be important for #9072.

I guess the issue with process.cwd() is that it might give us the repository root rather than the runtime root. For example, the app might be run from process.cwd() + '/packages/my-app/dist/' so if we use cwd, paths (and therefore modules, will always start packages.my-app.dist.*.

dirname(require.main.filename) will only give us an accurate runtime root if the entry point is in the root. I suspect this is true the majority of the time.

In the Deno SDK, due to permissions we might not have have access to cwd() or the file system. To work around this, we parse a new Error().stack from init and pick the common root path from the stack trace.

sentry-javascript/packages/deno/src/integrations/normalizepaths.ts

Lines 7 to 40 in ff95fd5

	function appRootFromErrorStack(error: Error): string | undefined {
	// We know at the other end of the stack from here is the entry point that called 'init'
	// We assume that this stacktrace will traverse the root of the app
	const frames = createStackParser(nodeStackLineParser())(error.stack || '');
	const paths = frames
	// We're only interested in frames that are in_app with filenames
	.filter(f => f.in_app && f.filename)
	.map(
	f =>
	(f.filename as string)
	.replace(/^[A-Z]:/, '') // remove Windows-style prefix
	.replace(/\\/g, '/') // replace all `\` instances with `/`
	.split('/')
	.filter(seg => seg !== ''), // remove empty segments
	) as string[][];
	if (paths.length == 0) {
	return undefined;
	}
	if (paths.length == 1) {
	// Assume the single file is in the root
	return dirname(paths[0].join('/'));
	}
	// Iterate over the paths and bail out when they no longer have a common root
	let i = 0;
	while (paths[0][i] && paths.every(w => w[i] === paths[0][i])) {
	i++;
	}
	return paths[0].slice(0, i).join('/');
	}

[mydea]

💯 01, nice!