Raise error if we get a non 200 status from fetch (#935)

* Raise error if we get a non 200 status from fetch

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Add custom exception

* Add check for TypeError as well

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

pyscriptjs/src/main.ts

@@ -210,8 +210,13 @@ export class PyScriptApp {
             } catch (e) {
                 // Remove the loader so users can see the banner better
                 this.loader.remove()
-                //Should we still export full error contents to console?
-                handleFetchError(<Error>e, fetchPaths[i]);
+                // The 'TypeError' here happens when running pytest
+                // I'm not particularly happy with this solution.
+                if (e.name === "FetchError" || e.name === "TypeError") {
+                    handleFetchError(<Error>e, fetchPaths[i]);
+                } else {
+                    throw e
+                }
             }
         }
         logger.info('All paths fetched');