feat: don't report stats.yml-only changes

src/diffCheck.ts

@@ -0,0 +1,101 @@
+import { Stainless } from "@stainless-api/sdk";
+import { logger } from "./logger";
+import type { Outcomes } from "./outcomes";
+
+export async function isOnlyStatsChanged({
+  stainless,
+  outcomes,
+  baseOutcomes,
+  headBuildId,
+}: {
+  stainless: Stainless;
+  outcomes: Outcomes;
+  baseOutcomes: Outcomes;
+  headBuildId: string;
+}): Promise<boolean> {
+  for (const lang of Object.keys(baseOutcomes)) {
+    if (!(lang in outcomes)) {
+      return false;
+    }
+  }
+
+  for (const [lang, head] of Object.entries(outcomes)) {
+    if (!(lang in baseOutcomes)) {
+      return false;
+    }
+    const base = baseOutcomes[lang]!;
+
+    const headConclusion = head.commit?.conclusion;
+    if (headConclusion === "noop") {
+      continue;
+    }
+
+    if (!base.commit?.completed?.commit || !head.commit?.completed?.commit) {
+      return false;
+    }
+
+    const baseSha = base.commit.completed.commit.sha;
+    const headSha = head.commit.completed.commit.sha;
+    const { owner, name } = head.commit.completed.commit.repo;
+
+    let token: string;
+    try {
+      const output = await stainless.builds.targetOutputs.retrieve({
+        build_id: headBuildId,
+        target: lang as Stainless.Target,
+        type: "source",
+        output: "git",
+      });
+      if (output.output !== "git") {
+        logger.debug(
+          `targetOutputs for ${lang} returned non-git output, skipping stats check`,
+        );
+        return false;
+      }
+      token = output.token;
+    } catch (e) {
+      logger.debug(
+        `Could not get git access for ${lang}, skipping stats check`,
+        e,
+      );
+      return false;
+    }
+
+    try {
+      const response = await fetch(
+        `https://api.github.com/repos/${owner}/${name}/compare/${baseSha}...${headSha}`,
+        {
+          headers: {
+            Authorization: `token ${token}`,
+            Accept: "application/vnd.github.v3+json",
+          },
+        },
+      );
+
+      if (!response.ok) {
+        logger.debug(
+          `GitHub compare API returned ${response.status} for ${lang}, skipping stats check`,
+        );
+        return false;
+      }
+
+      const data = (await response.json()) as {
+        status: string;
+        files?: Array<{ filename: string }>;
+      };
+
+      const files = data.files ?? [];
+      if (!files.every((f) => f.filename === ".stats.yml")) {
+        return false;
+      }
+    } catch (e) {
+      logger.debug(
+        `Error comparing commits for ${lang}, skipping stats check`,
+        e,
+      );
+      return false;
+    }
+  }
+
+  return true;
+}