New file: src/pullRequestChangedFiles

src/pullRequestChangedFiles.js

@@ -0,0 +1,55 @@
+export default async function pullRequestChangedFIles ({ github, githubToken, owner, name, prnumber }) {
+  if (!github && githubToken) {
+    const { Octokit } = await import('octokit')
+
+    github = new Octokit({ auth: githubToken })
+  }
+
+  if (!github && !githubToken) {
+    throw new Error('either githubToken or github is required!')
+  }
+
+  prnumber = parseInt(prnumber, 10)
+
+  const query = `query ($owner: String!, $name: String!, $prnumber: Int!, $cursor: String) {
+    repository(owner: $owner, name: $name) {
+      pullRequest(number: $prnumber) {
+        files(first: 100, after: $cursor) {
+          pageInfo {
+            endCursor
+            hasNextPage
+          }
+          nodes {
+            path
+            additions
+            deletions
+          }
+        }
+      }
+    }
+  }`
+
+  const vars = {
+    owner,
+    name,
+    prnumber
+  }
+
+  let hasNextPage = true
+  let paths = []
+  while (hasNextPage) {
+    const { repository } = await github.graphql(query, vars)
+    const files = repository.pullRequest.files
+
+    // prepare the next iteration
+    hasNextPage = files.pageInfo.hasNextPage
+    vars.cursor = files.pageInfo.endCursor
+
+    // append new paths to paths array
+    // check for additions only, deletions are not relevant, in this case
+    paths = paths.concat(
+      files.nodes.filter(file => file.additions /* + file.deletions */ > 0).map(file => file.path))
+  }
+
+  return paths
+}