Installing dependencies.

node_modules/env-ci/services/github.js

@@ -0,0 +1,49 @@
+// https://docs.github.com/en/actions/learn-github-actions/environment-variables#default-environment-variables
+const {parseBranch} = require('../lib/utils.js');
+
+const getPrEvent = ({env}) => {
+  try {
+    const event = env.GITHUB_EVENT_PATH ? require(env.GITHUB_EVENT_PATH) : undefined;
+
+    if (event && event.pull_request) {
+      return {
+        branch: event.pull_request.base ? parseBranch(event.pull_request.base.ref) : undefined,
+        pr: event.pull_request.number,
+      };
+    }
+  } catch {
+    // Noop
+  }
+
+  return {pr: undefined, branch: undefined};
+};
+
+const getPrNumber = (env) => {
+  const event = env.GITHUB_EVENT_PATH ? require(env.GITHUB_EVENT_PATH) : undefined;
+  return event && event.pull_request ? event.pull_request.number : undefined;
+};
+
+module.exports = {
+  detect({env}) {
+    return Boolean(env.GITHUB_ACTIONS);
+  },
+  configuration({env, cwd}) {
+    const isPr = env.GITHUB_EVENT_NAME === 'pull_request' || env.GITHUB_EVENT_NAME === 'pull_request_target';
+    const branch = parseBranch(
+      env.GITHUB_EVENT_NAME === 'pull_request_target' ? `refs/pull/${getPrNumber(env)}/merge` : env.GITHUB_REF
+    );
+
+    return {
+      name: 'GitHub Actions',
+      service: 'github',
+      commit: env.GITHUB_SHA,
+      build: env.GITHUB_RUN_ID,
+      isPr,
+      branch,
+      prBranch: isPr ? branch : undefined,
+      slug: env.GITHUB_REPOSITORY,
+      root: env.GITHUB_WORKSPACE,
+      ...(isPr ? getPrEvent({env, cwd}) : undefined),
+    };
+  },
+};