when creating assignments, verify the classroom url can be swapped

globalSettings.yml

@@ -17,3 +17,5 @@ courses:
     name: Old Adv Frontend
   - path: ./1430/2025-spring-jonathan/Modules/
     name: Jonathan UX
+  - path: ./1400/2025_spring_alex/modules/
+    name: 1400-spring

src/features/canvas/services/canvasAssignmentService.ts

@@ -36,6 +36,7 @@ export const canvasAssignmentService = {
         {
           source: "insert_github_classroom_url",
           destination: localAssignment.githubClassroomAssignmentShareLink || "",
+          strict: true,
         },
       ],
     });
@@ -93,6 +94,7 @@ export const canvasAssignmentService = {
               source: "insert_github_classroom_url",
               destination:
                 localAssignment.githubClassroomAssignmentShareLink || "",
+              strict: true,
             },
           ],
         }),

src/services/htmlMarkdownUtils.ts

@@ -87,11 +87,25 @@ export function markdownToHTMLSafe({
   markdownString: string;
   settings: LocalCourseSettings;
   convertImages?: boolean;
-  replaceText?: { source: string; destination: string }[];
+  replaceText?: { source: string; destination: string; strict?: boolean }[];
 }) {
   const html = markdownToHtmlNoImages(markdownString);
   const replacedHtml = replaceText.reduce(
-    (acc, { source, destination }) => acc.replaceAll(source, destination),
+    (acc, { source, destination, strict = false }) => {
+      if (strict) {
+        if (typeof destination === "undefined" || destination === null) {
+          throw new Error(
+            `Text replacement failed: destination is undefined for source "${source}"`
+          );
+        }
+        if (destination === "") {
+          throw new Error(
+            `Text replacement failed: destination is empty string for source "${source}"`
+          );
+        }
+      }
+      return acc.replaceAll(source, destination);
+    },
     html
   );