1. /**
  2. * Fetches file contents with graceful fallback and error handling.
  3. *
  4. * @param {string} filePath The path to the file.
  5. * @param {function} fallbackFunction The function to execute if file loading fails.
  6. * @returns {Promise<string>} A promise that resolves with the file contents as a string.
  7. * Rejects if both file loading and fallback fail.
  8. */
  9. async function getFileContents(filePath, fallbackFunction) {
  10. try {
  11. // Attempt to fetch the file contents using fetch.
  12. const response = await fetch(filePath);
  14. if (!response.ok) {
  15. // Handle HTTP errors.
  16. throw new Error(`HTTP error! Status: ${response.status}`);
  17. }
  19. const text = await response.text();
  20. return text; // Return file contents as a string.
  22. } catch (error) {
  23. // Handle fetch errors.
  24. console.error(`Error fetching file: ${filePath}`, error);
  26. // Execute the fallback function.
  27. try {
  28. const fallbackResult = await fallbackFunction();
  29. if (fallbackResult !== undefined) {
  30. return fallbackResult; // Return fallback result if successful.
  31. } else {
  32. throw new Error("Fallback function returned undefined."); //Propagate fallback failure.
  33. }
  34. } catch (fallbackError) {
  35. // Handle fallback errors.
  36. console.error("Fallback function failed:", fallbackError);
  37. throw new Error(`File loading and fallback failed: ${filePath}`, fallbackError); //Propagate combined failure.
  38. }
  39. }
  40. }

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