mapping-entry.js 2.1 KB

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  1. "use strict";
  2. Object.defineProperty(exports, "__esModule", { value: true });
  3. exports.getAbsoluteMappingEntries = void 0;
  4. var path = require("path");
  5. /**
  6. * Converts an absolute baseUrl and paths to an array of absolute mapping entries.
  7. * The array is sorted by longest prefix.
  8. * Having an array with entries allows us to keep a sorting order rather than
  9. * sort by keys each time we use the mappings.
  10. *
  11. * @param absoluteBaseUrl
  12. * @param paths
  13. * @param addMatchAll
  14. */
  15. function getAbsoluteMappingEntries(absoluteBaseUrl, paths, addMatchAll) {
  16. // Resolve all paths to absolute form once here, and sort them by
  17. // longest prefix once here, this saves time on each request later.
  18. // We need to put them in an array to preserve the sorting order.
  19. var sortedKeys = sortByLongestPrefix(Object.keys(paths));
  20. var absolutePaths = [];
  21. for (var _i = 0, sortedKeys_1 = sortedKeys; _i < sortedKeys_1.length; _i++) {
  22. var key = sortedKeys_1[_i];
  23. absolutePaths.push({
  24. pattern: key,
  25. paths: paths[key].map(function (pathToResolve) {
  26. return path.resolve(absoluteBaseUrl, pathToResolve);
  27. }),
  28. });
  29. }
  30. // If there is no match-all path specified in the paths section of tsconfig, then try to match
  31. // all paths relative to baseUrl, this is how typescript works.
  32. if (!paths["*"] && addMatchAll) {
  33. absolutePaths.push({
  34. pattern: "*",
  35. paths: ["".concat(absoluteBaseUrl.replace(/\/$/, ""), "/*")],
  36. });
  37. }
  38. return absolutePaths;
  39. }
  40. exports.getAbsoluteMappingEntries = getAbsoluteMappingEntries;
  41. /**
  42. * Sort path patterns.
  43. * If a module name can be matched with multiple patterns then pattern with the longest prefix will be picked.
  44. */
  45. function sortByLongestPrefix(arr) {
  46. return arr
  47. .concat()
  48. .sort(function (a, b) { return getPrefixLength(b) - getPrefixLength(a); });
  49. }
  50. function getPrefixLength(pattern) {
  51. var prefixLength = pattern.indexOf("*");
  52. return pattern.substr(0, prefixLength).length;
  53. }
  54. //# sourceMappingURL=mapping-entry.js.map