diff --git a/README.md b/README.md
index 3bb04f6..b95ff0c 100644
--- a/README.md
+++ b/README.md
@@ -83,6 +83,7 @@ jobs:
 | `publish-npm`           | Publish the package to an npm registry when the release PR is merged                                | No       | `false`                      |
 | `npm-token`             | Auth token for the npm registry (required when `publish-npm` is `true`)                             | No       | —                            |
 | `npm-registry`          | npm registry URL (set to `https://npm.pkg.github.com` for GitHub Packages)                          | No       | `https://registry.npmjs.org` |
+| `npm-build-command`     | Build command to run before `npm publish` (e.g., `npm run build`)                                   | No       | —                            |
 
 ## Outputs
 
@@ -178,6 +179,7 @@ Commits that can't be linked to a PR will reference the commit SHA instead.
     github-token: ${{ secrets.GITHUB_TOKEN }}
     publish-npm: true
     npm-token: ${{ secrets.NPM_TOKEN }}
+    npm-build-command: 'npm run build'
 ```
 
 ### Publish to GitHub Packages
@@ -189,6 +191,7 @@ Commits that can't be linked to a PR will reference the commit SHA instead.
     publish-npm: true
     npm-token: ${{ secrets.GITHUB_TOKEN }}
     npm-registry: 'https://npm.pkg.github.com'
+    npm-build-command: 'npm run build'
 ```
 
 ### Tag only, no GitHub release
diff --git a/action.yml b/action.yml
index f6638ec..9625e94 100644
--- a/action.yml
+++ b/action.yml
@@ -47,6 +47,9 @@ inputs:
     description: 'npm registry URL (e.g., https://npm.pkg.github.com for GitHub Packages)'
     required: false
     default: 'https://registry.npmjs.org'
+  npm-build-command:
+    description: 'Build command to run before npm publish (e.g., npm run build)'
+    required: false
 
 outputs:
   version:
@@ -80,6 +83,7 @@ runs:
         INPUT_PUBLISH_NPM: ${{ inputs.publish-npm }}
         INPUT_NPM_TOKEN: ${{ inputs.npm-token }}
         INPUT_NPM_REGISTRY: ${{ inputs.npm-registry }}
+        INPUT_NPM_BUILD_COMMAND: ${{ inputs.npm-build-command }}
         PR_NUMBER: ${{ github.event.pull_request.number }}
         PR_HEAD_REF: ${{ github.event.pull_request.head.ref }}
         PR_MERGED: ${{ github.event.pull_request.merged }}
diff --git a/scripts/finalize-release.sh b/scripts/finalize-release.sh
index e2782c1..f9598be 100755
--- a/scripts/finalize-release.sh
+++ b/scripts/finalize-release.sh
@@ -79,6 +79,12 @@ main() {
     echo "${registry_host}/:_authToken=${INPUT_NPM_TOKEN}" > .npmrc
     echo "registry=${registry}" >> .npmrc
 
+    if [[ -n "${INPUT_NPM_BUILD_COMMAND:-}" ]]; then
+      echo "Running build: ${INPUT_NPM_BUILD_COMMAND}"
+      npm install
+      eval "$INPUT_NPM_BUILD_COMMAND"
+    fi
+
     npm publish
 
     rm -f .npmrc