Added initial npm diff.

npm/npm-diff/action.yaml

@@ -0,0 +1,63 @@
+name: npm-diff
+description: "Compare two versions of an NPM package using npm diff."
+inputs:
+  name:
+    description: "Name of the package to diff."
+    required: true
+  lhsVersion:
+    description: "Left-hand side version (older version) to compare. If not specified, uses the latest version."
+    required: false
+    default: ""
+  rhsVersion:
+    description: "Right-hand side version (newer version) to compare. If not specified, compares against the working directory."
+    required: false
+    default: ""
+  workingDirectory:
+    description: "Working directory containing package.json (for comparing local changes)."
+    required: false
+    default: "."
+  nodeVersion:
+    description: "Node.js version to use."
+    required: false
+    default: "20"
+  registry:
+    description: "NPM registry URL."
+    required: false
+    default: "https://npm.pkg.github.com"
+  authToken:
+    description: "Authentication token for the registry."
+    required: true
+    default: "{{ github.token }}"
+  diffOptions:
+    description: "Additional options to pass to npm diff (e.g., '--diff-ignore-whitespace')."
+    required: false
+    default: ""
+  outputFile:
+    description: "File path to save diff output (optional). If not specified, outputs to console only."
+    required: false
+    default: ""
+  failOnDifferences:
+    description: "Whether to fail the action if differences are found."
+    required: false
+    default: "true"
+outputs:
+  hasDifferences:
+    description: "Whether differences were found between the versions."
+    value: ${{ steps.diff.outputs.hasDifferences }}
+  diffOutput:
+    description: "The diff output (truncated if too large)."
+    value: ${{ steps.diff.outputs.diffOutput }}
+runs:
+  using: "composite"
+  steps:
+  - name: "Setup Node.js"
+    uses: https://github.com/actions/setup-node@v4
+    with:
+      node-version: ${{ inputs.nodeVersion }}
+      registry-url: ${{ inputs.registry }}
+  - name: "Run npm diff"
+    id: diff
+    env:
+      NODE_AUTH_TOKEN: ${{ inputs.authToken }}
+    run: bash ${{ github.action_path }}/npm_diff.sh "${{ inputs.name }}" "${{ inputs.lhsVersion }}" "${{ inputs.rhsVersion }}" "${{ inputs.workingDirectory }}" "${{ inputs.registry }}" "${{ inputs.diffOptions }}" "${{ inputs.outputFile }}" "${{ inputs.failOnDifferences }}"
+    shell: bash