Adds visual regression output, spellcheck and prints the test PR via …

…danger

.github/workflows/CI.yml

@@ -26,5 +26,12 @@ jobs:
         NOW_ACCESS_TOKEN: ${{ secrets.NOW_ACCESS_TOKEN }}
         PR_NUMBER: ${{ github.event.pull_request.number }}
 
+  # danger for PR builds
+      - if: github.event_name == 'pull_request'
+        run: 'if test -z "$GITHUB_TOKEN"; then echo "Skipping danger"; else yarn danger ci; fi'
+
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
     # Run any tests
     - run: yarn workspaces run test --ci

dangerfile.ts

@@ -0,0 +1,40 @@
+// This Dangerfile only runs on same-repo PRs
+
+// You can test it by running 
+// yarn danger pr https://github.com/microsoft/TypeScript-Website/pull/115  
+
+import { danger, message, markdown } from 'danger'
+import {basename} from "path"
+import spellcheck from 'danger-plugin-spellcheck'
+
+// Spell check all the things
+spellcheck({
+  settings: 'artsy/peril-settings@spellcheck.json',
+  codeSpellCheck: ['Examples/**/*.ts', 'Examples/**/*.js'],
+})
+
+// Print out the PR url
+const deployURL = `https://typescript-v2-${danger.github.pr.number}.ortam.now.sh`
+message(`Deployed to [a PR branch](${deployURL})`)
+
+// Look for new snapshots and show in a HTML table
+const snapshots = danger.git.fileMatch("packages/typescriptlang-org/_tests/backstop_data/bitmaps_reference/*.png")
+if (snapshots.modified) {
+  const oldSha = danger.github.pr.base.sha
+  const newSha = danger.github.pr.head.sha
+
+  const tables = snapshots.getKeyedPaths().modified.map(p => {
+    const oldURL = `https://raw.githubusercontent.com/microsoft/TypeScript-Website/${oldSha}/${p}`
+    const newURL = `https://raw.githubusercontent.com/microsoft/TypeScript-Website/${newSha}/${p}`
+
+    return `
+###### \`${basename(p)}\`
+
+Before             |  After
+:-------------------------:|:-------------------------:
+![](${oldURL})  |  ![](${newURL})
+`
+  })
+
+  markdown(`## Snapshots updated\n\n ${tables.join("\n\n")}`)
+}

package.json

@@ -24,5 +24,9 @@
     "semi": false,
     "singleQuote": true,
     "trailingComma": "es5"
+  },
+  "dependencies": {
+    "danger": "^9.2.4",
+    "danger-plugin-spellcheck": "^1.5.0"
   }
 }