chore: automatically age out old TypeScript versions from testing

packages/@aws-cdk-testing/cli-integ/lib/npm.ts

@@ -10,4 +10,32 @@ export function typescriptVersionsSync(): string[] {
 
   const versions: string[] = JSON.parse(stdout);
   return Array.from(new Set(versions.map(v => v.split('.').slice(0, 2).join('.'))));
-}
+}
+
+/**
+ * Use NPM preinstalled on the machine to query publish times of versions
+ */
+export function typescriptVersionsYoungerThanDaysSync(days: number, versions: string[]): string[] {
+  const { stdout } = spawnSync('npm', ['--silent', 'view', 'typescript', 'time', '--json'], { encoding: 'utf-8' });
+  const versionTsMap: Record<string, string> = JSON.parse(stdout);
+
+  const cutoffDate = new Date(Date.now() - (days * 24 * 3600 * 1000));
+  const cutoffDateS = cutoffDate.toISOString();
+
+  const recentVersions = Object.entries(versionTsMap)
+    .filter(([_, dateS]) => dateS > cutoffDateS)
+    .map(([v]) => v);
+
+  // Input versions are of the form 3.9, 5.2, etc.
+  // Actual versions are of the form `3.9.15`, `5.3.0-dev.20511311`.
+  // Return only 2-digit versions for which there is a non-prerelease version in the set of recentVersions
+  // So a 2-digit versions that is followed by `.<digits>` until the end of the string.
+  return versions.filter((twoV) => {
+    const re = new RegExp(`^${reQuote(twoV)}\\.\\d+$`);
+    return recentVersions.some(fullV => fullV.match(re));
+  });
+}
+
+function reQuote(str: string): string {
+  return str.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}

packages/@aws-cdk-testing/cli-integ/tests/init-typescript-app/init-typescript-app.integtest.ts

@@ -1,7 +1,7 @@
 import { promises as fs } from 'fs';
 import * as path from 'path';
 import { integTest, withTemporaryDirectory, ShellHelper, withPackages, TemporaryDirectoryContext } from '../../lib';
-import { typescriptVersionsSync } from '../../lib/npm';
+import { typescriptVersionsSync, typescriptVersionsYoungerThanDaysSync } from '../../lib/npm';
 
 ['app', 'sample-app'].forEach(template => {
   integTest(`typescript init ${template}`, withTemporaryDirectory(withPackages(async (context) => {
@@ -19,10 +19,18 @@ import { typescriptVersionsSync } from '../../lib/npm';
   })));
 });
 
+// Same as https://github.com/DefinitelyTyped/DefinitelyTyped?tab=readme-ov-file#support-window
+const TYPESCRIPT_VERSION_AGE_DAYS = 2 * 365;
+
+const TYPESCRIPT_VERSIONS = typescriptVersionsYoungerThanDaysSync(TYPESCRIPT_VERSION_AGE_DAYS, typescriptVersionsSync());
+
+// eslint-disable-next-line no-console
+console.log(TYPESCRIPT_VERSIONS);
+
 /**
  * Test our generated code with various versions of TypeScript
  */
-typescriptVersionsSync().forEach(tsVersion => {
+TYPESCRIPT_VERSIONS.forEach(tsVersion => {
   integTest(`typescript ${tsVersion} init app`, withTemporaryDirectory(withPackages(async (context) => {
     const shell = ShellHelper.fromContext(context);
     await context.packages.makeCliAvailable();