Narrow caught exceptions

The update to 4.4.2 brings increased type strictness. Previously, exceptions were used in some catch blocks based on an
assumption of their type. But exceptions can have any type and that now results in errors (TS2345, TS2571). This is fixed
by narrowing the exceptions to the expected type before using them as such.

dist/index.js

@@ -158,7 +158,9 @@ function downloadRelease(version) {
             downloadPath = yield tc.downloadTool(downloadUrl);
         }
         catch (error) {
-            core.debug(error);
+            if (typeof error === "string" || error instanceof Error) {
+                core.debug(error.toString());
+            }
             throw new Error(`Failed to download version ${version}: ${error}`);
         }
         // Extract
@@ -255,7 +257,12 @@ function run() {
             yield installer.getTask(version, repoToken);
         }
         catch (error) {
-            core.setFailed(error.message);
+            if (error instanceof Error) {
+                core.setFailed(error.message);
+            }
+            else {
+                throw error;
+            }
         }
     });
 }

src/installer.ts

@@ -155,7 +155,9 @@ async function downloadRelease(version: string): Promise<string> {
   try {
     downloadPath = await tc.downloadTool(downloadUrl);
   } catch (error) {
-    core.debug(error);
+    if (typeof error === "string" || error instanceof Error) {
+      core.debug(error.toString());
+    }
     throw new Error(`Failed to download version ${version}: ${error}`);
   }
 

src/main.ts

@@ -20,7 +20,11 @@ async function run() {
 
     await installer.getTask(version, repoToken);
   } catch (error) {
-    core.setFailed(error.message);
+    if (error instanceof Error) {
+      core.setFailed(error.message);
+    } else {
+      throw error;
+    }
   }
 }