revert MissingPushHook checks changes

src/workflow.test.ts

@@ -34,6 +34,12 @@ test("getWorkflowErrors() when on.push is an array missing pull_request", (t) =>
   t.deepEqual(...errorCodes(errors, []));
 });
 
+test("getWorkflowErrors() when on.push is an array missing push", (t) => {
+  const errors = getWorkflowErrors({ on: ["pull_request"] });
+
+  t.deepEqual(...errorCodes(errors, [WorkflowErrors.MissingPushHook]));
+});
+
 test("getWorkflowErrors() when on.push is valid", (t) => {
   const errors = getWorkflowErrors({
     on: ["push", "pull_request"],
@@ -242,6 +248,14 @@ test("formatWorkflowErrors() when there is one error", (t) => {
   t.true(message.startsWith("1 issue was detected with this workflow:"));
 });
 
+test("formatWorkflowErrors() when there are multiple errors", (t) => {
+  const message = formatWorkflowErrors([
+    WorkflowErrors.CheckoutWrongHead,
+    WorkflowErrors.MissingPushHook,
+  ]);
+  t.true(message.startsWith("2 issues were detected with this workflow:"));
+});
+
 test("formatWorkflowCause() with no errors", (t) => {
   const message = formatWorkflowCause([]);
 
@@ -249,9 +263,12 @@ test("formatWorkflowCause() with no errors", (t) => {
 });
 
 test("formatWorkflowCause()", (t) => {
-  const message = formatWorkflowCause([WorkflowErrors.CheckoutWrongHead]);
+  const message = formatWorkflowCause([
+    WorkflowErrors.CheckoutWrongHead,
+    WorkflowErrors.MissingPushHook,
+  ]);
 
-  t.deepEqual(message, "CheckoutWrongHead");
+  t.deepEqual(message, "CheckoutWrongHead,MissingPushHook");
   t.deepEqual(formatWorkflowCause([]), undefined);
 });
 

src/workflow.ts

@@ -44,6 +44,10 @@ export interface Workflow {
   on?: string | string[] | WorkflowTriggers;
 }
 
+function isObject(o: unknown): o is object {
+  return o !== null && typeof o === "object";
+}
+
 const GLOB_PATTERN = new RegExp("(\\*\\*?)");
 
 function escapeRegExp(string) {
@@ -92,6 +96,7 @@ function toCodedErrors(errors: {
 // code to send back via status report
 // message to add as a warning annotation to the run
 export const WorkflowErrors = toCodedErrors({
+  MissingPushHook: `Please specify an on.push hook.`,
   CheckoutWrongHead: `git checkout HEAD^2 is no longer necessary. Please remove this step as Code Scanning recommends analyzing the merge commit for best results.`,
 });
 
@@ -120,6 +125,36 @@ export function getWorkflowErrors(doc: Workflow): CodedError[] {
     }
   }
 
+  let missingPush = false;
+
+  if (doc.on === undefined) {
+    // this is not a valid config
+  } else if (typeof doc.on === "string") {
+    if (doc.on === "pull_request") {
+      missingPush = true;
+    }
+  } else if (Array.isArray(doc.on)) {
+    const hasPush = doc.on.includes("push");
+    const hasPullRequest = doc.on.includes("pull_request");
+    if (hasPullRequest && !hasPush) {
+      missingPush = true;
+    }
+  } else if (isObject(doc.on)) {
+    const hasPush = Object.prototype.hasOwnProperty.call(doc.on, "push");
+    const hasPullRequest = Object.prototype.hasOwnProperty.call(
+      doc.on,
+      "pull_request"
+    );
+
+    if (!hasPush && hasPullRequest) {
+      missingPush = true;
+    }
+  }
+
+  if (missingPush) {
+    errors.push(WorkflowErrors.MissingPushHook);
+  }
+
   return errors;
 }