Improve @babel/runtime esm stability (#12883)

test/runtime-integration/node.cjs

@@ -0,0 +1,65 @@
+const cp = require("child_process");
+const path = require("path");
+const fs = require("fs");
+
+const [major, minor] = process.versions.node.split(".").map(n => +n);
+
+if (major > 12 || (major === 12 && minor >= 17)) {
+  test("ESM", "--experimental-modules ./src/main-esm.mjs", "expected-esm.txt");
+  // TODO: This never worked in any Babel version
+  // test("ESM - absoluteRuntime", "--esperimental-modules ./src/absolute/main-esm.mjs", "expected-esm-absolute.txt");
+}
+
+const expectedCjs =
+  major === 10 || (major === 12 && minor < 12.17)
+    ? "expected-cjs-10.txt"
+    : "expected-cjs.txt";
+
+test("CJS", "./src/main-cjs.cjs", expectedCjs);
+
+const expectedCjsAbsolute =
+  major === 10 || (major === 12 && minor < 12.17)
+    ? "expected-cjs-absolute-10.txt"
+    : major === 13 && minor <= 1
+    ? "expected-cjs-absolute-13.0.txt"
+    : "expected-cjs-absolute.txt";
+
+test(
+  "CJS - absoluteRuntime",
+  "./src/absolute/main-cjs.cjs",
+  expectedCjsAbsolute
+);
+
+function test(title, command, expectedName) {
+  const expectedPath = path.join(__dirname, expectedName);
+  const expected = fs.readFileSync(expectedPath, "utf8");
+
+  console.log(`Testing with Node.js ${process.version} - ${title}`);
+  const out = normalize(
+    cp.execSync(`node ${command}`, {
+      cwd: __dirname,
+      encoding: "utf8",
+    })
+  );
+
+  if (expected === out) {
+    console.log("OK");
+  } else if (process.env.OVERWRITE) {
+    fs.writeFileSync(expectedPath, out);
+    console.log("UPDATED");
+  } else {
+    console.error("FAILED\n\n");
+    console.error(out);
+    process.exitCode = 1;
+  }
+  console.log("\n");
+}
+
+function normalize(output) {
+  const root = path.resolve(__dirname, "../..");
+  let next;
+  while ((next = output.replace(root, "<ROOT>")) !== output) {
+    output = next;
+  }
+  return output;
+}