test npx and update dangerfile to javascript syntax

.github/workflows/danger.yml

@@ -9,14 +9,20 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
       - name: Use Node.js 20.x
-        uses: actions/setup-node@master
+        uses: actions/setup-node@v3
         with:
           node-version: 20.x
+          cache: 'npm'
+
       - name: Install Dependencies
         run: npm ci
-      - name: Danger
-        run: npm danger ci
+
+      - name: Run Danger
+        run: npx danger ci
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

dangerfile.js

@@ -1,16 +1,16 @@
-const hasChangelog = danger.git.modified_files.includes("CHANGELOG.md");
-const isTrivial = (danger.github.pr.body + danger.github.pr.title).includes(
-  "#trivial"
-);
-const has_app_changes = !git.modified_files.grep(/src/).empty
+import { danger, warn, fail } from 'danger'
+
+const hasAppChanges = danger.git.modified_files.some(file => file.includes('src'))
+const hasChangelog = danger.git.modified_files.includes("CHANGELOG.md")
+const isDeclaredTrivial = (danger.github.pr.title + danger.github.pr.body).includes('#trivial') || !hasAppChanges
 
 //Make sure we add changelog
-if (!hasChangelog && !isTrivial) {
+if (!hasChangelog && !isDeclaredTrivial) {
   warn("Please add a changelog entry for your changes.");
 }
 
 //Mainly to encourage writing up some reasoning about the PR, rather than just leaving a title
-if (github.pr_body.length < 3) {
+if (danger.github.pr.body.length < 3) {
     warn('Please add a detailed summary in the description.') 
 }
 
@@ -20,22 +20,13 @@ if (github.pr_body.length < 3) {
 // }
 
 //Make it more obvious that a PR is a work in progress and shouldn't be merged yet
-if (github.pr_title.includes('[WIP]')) {
+if (danger.github.pr.title.includes('[WIP]')) {
     warn('PR is classed as Work in Progress') 
 }
 
-//Let people say that this isn't worth a CHANGELOG entry in the PR if they choose
-declared_trivial = (github.pr_title + github.pr_body).includes('#trivial') || !has_app_changes
-if (!git.modified_files.include?('CHANGELOG.md') && !declared_trivial){
-  raise(
-    'Please include a CHANGELOG entry. You can find it at [CHANGELOG.md](https://github.com/policy-design-lab/pdl-frontend/blob/develop/CHANGELOG.md).',
-    sticky: false
-  )
-}
-
 //Detect .eslintrc changes and set warnings
-if (git.modified_files.include?('.eslintrc')) {
-    warn('Changes were made to .eslintrc. Please ensure that the you have notified team to change the existing ESLine rule.')
+if (danger.git.modified_files.includes('.eslintrc')) {
+  warn('Changes were made to .eslintrc. Please ensure that you have notified the team to change the existing ESLint rule.')
 }
 
 // In the future: make sure non-trivial amounts of code changes come with corresponding tests