Warn on unsupported versions but validate, skip tests

.changeset/dull-balloons-look.md

@@ -0,0 +1,6 @@
+---
+"@definitelytyped/header-parser": patch
+"@definitelytyped/dtslint": patch
+---
+
+Warn on unsupported versions but validate, skip tests

packages/dtslint/src/index.ts

@@ -208,8 +208,15 @@ async function runTests(
       // associated ts3.2, ts3.5, ts3.6 directories, for
       // <=3.2, <=3.5, <=3.6 respectively; the root level is for 3.7 and above.
       // so this code needs to generate ranges [lowest-3.2, 3.3-3.5, 3.6-3.6, 3.7-latest]
-      const lows = [TypeScriptVersion.lowest, ...typesVersions.map(next)];
-      const his = [...typesVersions, TypeScriptVersion.latest];
+      const supportedTypesVersions = typesVersions.filter(TypeScriptVersion.isSupported);
+      if (supportedTypesVersions.length !== typesVersions.length) {
+        const unsupportedTypesVersions = typesVersions.filter((v) => !TypeScriptVersion.isSupported(v));
+        warnings.push(
+          `Package ${packageName} has unsupported TypeScript versions that will not be tested: ${unsupportedTypesVersions.join(", ")}`,
+        );
+      }
+      const lows = [TypeScriptVersion.lowest, ...supportedTypesVersions.map(next)];
+      const his = [...supportedTypesVersions, TypeScriptVersion.latest];
       assert.strictEqual(lows.length, his.length);
       for (let i = 0; i < lows.length; i++) {
         const low = maxVersion(minVersion, lows[i]);

packages/header-parser/src/index.ts

@@ -327,7 +327,7 @@ export function validatePackageJson(
   }
 }
 
-export function getTypesVersions(dirPath: string): readonly TypeScriptVersion[] {
+export function getTypesVersions(dirPath: string): readonly AllTypeScriptVersion[] {
   return mapDefined(fs.readdirSync(dirPath), (name) => {
     if (name === "tsconfig.json") {
       return undefined;
@@ -340,9 +340,9 @@ export function getTypesVersions(dirPath: string): readonly TypeScriptVersion[]
     if (!TypeScriptVersion.isTypeScriptVersion(version)) {
       throw new Error(`There is an entry named ${name}, but ${version} is not a valid TypeScript version.`);
     }
-    if (!TypeScriptVersion.isSupported(version)) {
-      throw new Error(`At ${dirPath}/${name}: TypeScript version ${version} is not supported on Definitely Typed.`);
-    }
+    // if (!TypeScriptVersion.isSupported(version)) {
+    //   throw new Error(`At ${dirPath}/${name}: TypeScript version ${version} is not supported on Definitely Typed.`);
+    // }
     return version;
   });
 }