Move smoke test package script into scripts (#53245)

scripts/checkModuleFormat.mjs

@@ -0,0 +1,41 @@
+import { createRequire } from "module";
+import { __importDefault, __importStar } from "tslib";
+
+// This script tests that TypeScript's CJS API is structured
+// as expected. It calls "require" as though it were in CWD,
+// so it can be tested on a separate install of TypeScript.
+
+const require = createRequire(process.cwd() + "/index.js");
+
+console.log(`Testing ${process.argv[2]}...`);
+const ts = require(process.argv[2]);
+
+// See: https://github.com/microsoft/TypeScript/pull/51474#issuecomment-1310871623
+/** @type {[fn: (() => any), shouldSucceed: boolean][]} */
+const fns = [
+    [() => ts.version,                          true],
+    [() => ts.default.version,                  false],
+    [() => __importDefault(ts).version,         false],
+    [() => __importDefault(ts).default.version, true],
+    [() => __importStar(ts).version,            true],
+    [() => __importStar(ts).default.version,    true],
+];
+
+for (const [fn, shouldSucceed] of fns) {
+    let success = false;
+    try {
+        success = !!fn();
+    }
+    catch {
+        // Ignore
+    }
+    const status = success ? "succeeded" : "failed";
+    if (success === shouldSucceed) {
+        console.log(`${fn.toString()} ${status} as expected.`);
+    }
+    else {
+        console.log(`${fn.toString()} unexpectedly ${status}.`);
+        process.exitCode = 1;
+    }
+}
+console.log("ok");