Update cheatsheets

tldr/npm-diff

@@ -0,0 +1,38 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# npm diff
+
+> Compare package versions from the `npm` registry and show differences.
+> Similar to `git diff`.
+> More information: <https://docs.npmjs.com/cli/commands/npm-diff>.
+
+- Compare two specific package versions:
+
+`npm diff --diff {{package_name}}@{{version1}} --diff {{package_name}}@{{version2}}`
+
+- Compare current local packages with latest published version:
+
+`npm diff`
+
+- Compare current local package with a specific version:
+
+`npm diff --diff {{package_name}}@{{version}}`
+
+- Compare a package in the current directory with the registry version:
+
+`npm diff --diff {{package_name}}`
+
+- Show only filenames that differ:
+
+`npm diff --diff-name-only --diff {{package_name}}@{{version1}} --diff {{package_name}}@{{version2}}`
+
+- Compare specific files or directories only:
+
+`npm diff {{path/to/file_or_directory}} --diff {{package_name}}@{{version1}} --diff {{package_name}}@{{version2}}`
+
+- Ignore whitespace when comparing:
+
+`npm diff --diff-ignore-all-space --diff {{package_name}}@{{version1}} --diff {{package_name}}@{{version2}}`