fix: use shell for last commit and add comapre script

.github/workflows/update-compat-data.yml

@@ -14,15 +14,17 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/checkout@v2
         with:
-          repository: tc39/test262
-          path: build/test262
+          repository: kangax/compat-table
+          path: packages/babel-compat-data/build/compat-table
       - name: Use Node.js latest
         uses: actions/setup-node@v2-beta
         with:
           node-version: "*"
       - name: Get latest kangax/compat-data commit
         id: lastCommit
-        run: echo "::set-output name=sha1::$(node ./scripts/update-compat-data/get-last-commit.js)"
+        run: echo "::set-output name=sha1::$(node ./scripts/update-compat-data/get-last-commit.sh)"
+      - name: Compare last kangax/compat-data commit with current one
+        run: echo ${{ steps.lastCommit.outputs.sha1 }} | node ./scripts/update-compat-data/compare-with-current-commit.js
       - name: Update compat-data commit
         run: echo ${{ steps.lastCommit.outputs.sha1 }} | ./scripts/update-compat-data/bump-data-compat-version.sh
       - name: Run update script

scripts/update-compat-data/compare-with-current-commit.js

@@ -0,0 +1,49 @@
+import { readFile } from "fs/promises";
+import path from "path";
+import { fileURLToPath } from "url";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const CURRENT_COMMIT_VARIABLE_NAME = "COMPAT_TABLE_COMMIT";
+
+async function getCurrentCommit() {
+  const target = path.join(
+    __dirname,
+    "..",
+    "..",
+    "packages",
+    "babel-compat-data",
+    "scripts",
+    "download-compat-table.sh"
+  );
+  const lines = (await readFile(target, { encoding: "utf-8" })).split("\n");
+
+  for (const line of lines) {
+    if (line.includes(CURRENT_COMMIT_VARIABLE_NAME)) {
+      return line.split("=").at(1);
+    }
+  }
+
+  return undefined;
+}
+
+async function checkCurrentCommit(lastCommit) {
+  if (typeof lastCommit !== "string") {
+    throw new Error(`Last commit should be provided but got ${lastCommit}`);
+  }
+
+  const currentCommit = await getCurrentCommit();
+  if (typeof lastCommit !== "string") {
+    throw new Error("Not valid current commit found: ${currentCommit}");
+  }
+
+  console.log("last commit :", lastCommit);
+  console.log("current commit :", currentCommit);
+
+  if (lastCommit === currentCommit) {
+    throw new Error("compat-data doesn't need to be updated");
+  }
+
+  return lastCommit;
+}
+
+checkCurrentCommit(process.argv[2]).then(console.log);

scripts/update-compat-data/get-last-commit.sh

@@ -0,0 +1,4 @@
+ set -e
+ export GIT_DIR=./packages/babel-compat-data/build/compat-table
+ git fetch -q origin HEAD
+ git rev-parse FETCH_HEAD