`extractMainLockfileDocument` is broken on Windows

[t3chguy]

Current Behavior

Fails to extract the main document due to unexpected line endings.

Expected Behavior

Works the same way as Linux & macOS.

GitHub Repo

No response

Steps to Reproduce

1. Use pnpm 11 with a multi-document lockfile
2. Try to generate an nx graph

Nx Report

Report from dev machine, not affected CI.

 NX   Report complete - copy this into the issue template

Node           : 24.15.0
OS             : darwin-arm64
Native Target  : aarch64-macos
pnpm           : 11.2.2
daemon         : Available

nx             : 22.7.4
@nx/js         : 22.6.5
@nx/workspace  : 22.6.5
@nx/devkit     : 22.6.5
typescript     : 6.0.3
---------------------------------------
Community plugins:
@nx-tools/nx-container : 7.2.3
---------------------------------------
Cache Usage: 0.00 B / 92.64 GB
---------------------------------------
The following packages should match the installed version of nx
  - @nx/js@22.6.5
  - @nx/workspace@22.6.5
  - @nx/devkit@22.6.5

To fix this, run `nx migrate nx@22.7.4`
---------------------------------------
⚠️ Multiple Nx versions detected

Your workspace uses nx@22.7.4, but other packages depend on a different version:
  - @nx-tools/nx-container → @nx/devkit → nx@22.6.5

These packages should not have nx as a dependency. Please report this issue to the package maintainers.
Run `pnpm why nx@22.6.5` for more details.

Failure Logs

$ nx build -- "--publish" "never" "-w" "squirrel" "msi"
 NX   Failed to parse pnpm lockfile
Please open an issue at `https://github.com/nrwl/nx/issues/new?template=1-bug.yml` and provide a reproduction.
Original error: expected a single document in the stream, but found more
YAMLException: expected a single document in the stream, but found more
    at load (D:\a\element-web\element-web\node_modules\.pnpm\@zkochan+js-yaml@0.0.7\node_modules\@zkochan\js-yaml\lib\loader.js:1722:9)
    at parseAndNormalizePnpmLockfile (D:\a\element-web\element-web\node_modules\.pnpm\nx@22.7.2\node_modules\nx\dist\src\plugins\js\lock-file\utils\pnpm-normalizer.js:48:36)
    at parsePnpmLockFile (D:\a\element-web\element-web\node_modules\.pnpm\nx@22.7.2\node_modules\nx\dist\src\plugins\js\lock-file\pnpm-parser.js:28:73)
    at getPnpmLockfileNodes (D:\a\element-web\element-web\node_modules\.pnpm\nx@22.7.2\node_modules\nx\dist\src\plugins\js\lock-file\pnpm-parser.js:34:18)
    at getLockFileNodes (D:\a\element-web\element-web\node_modules\.pnpm\nx@22.7.2\node_modules\nx\dist\src\plugins\js\lock-file\lock-file.js:53:59)
    at internalCreateNodes (D:\a\element-web\element-web\node_modules\.pnpm\nx@22.7.2\node_modules\nx\dist\src\plugins\js\index.js:53:79)
    at D:\a\element-web\element-web\node_modules\.pnpm\nx@22.7.2\node_modules\nx\dist\src\project-graph\plugins\utils.js:10:33
    at Array.map (<anonymous>)
    at createNodesFromFiles (D:\a\element-web\element-web\node_modules\.pnpm\nx@22.7.2\node_modules\nx\dist\src\project-graph\plugins\utils.js:8:35)
    at exports.createNodesV2 (D:\a\element-web\element-web\node_modules\.pnpm\nx@22.7.2\node_modules\nx\dist\src\plugins\js\index.js:27:51)
 NX   Failed to process project graph.
An error occurred while processing files for the nx/js/dependencies-and-lockfile plugin.
  - pnpm-lock.yaml:
      expected a single document in the stream, but found more
[ELIFECYCLE] Command failed with exit code 1.

Package Manager Version

No response

Operating System

• macOS
• Linux
• Windows
• Other (Please specify)

Additional Information

nx/packages/nx/src/plugins/js/lock-file/utils/pnpm-normalizer.ts

Lines 66 to 83 in 7e87698

	// pnpm 11 writes a two-document lockfile when `managePackageManagerVersions` is
	// enabled: the first document holds package-manager metadata, and the second
	// holds the workspace lockfile. Mirror pnpm's own positional extraction so we
	// always read the workspace document.
	// https://github.com/pnpm/pnpm/blob/main/lockfile/fs/src/yamlDocuments.ts
	function extractMainLockfileDocument(content: string): string {
	if (!content.startsWith(YAML_DOCUMENT_START)) {
	return content;
	}
	const separatorIndex = content.indexOf(
	YAML_DOCUMENT_SEPARATOR,
	YAML_DOCUMENT_START.length
	);
	if (separatorIndex === -1) {
	return '';
	}
	return content.slice(separatorIndex + YAML_DOCUMENT_SEPARATOR.length);
	}

cribs some of the code, but not enough to work on Windows. https://github.com/pnpm/pnpm/blob/main/lockfile/fs/src/yamlDocuments.ts#L31 namely is missing