match-path-sync.js 4.2 KB

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  1. "use strict";
  2. Object.defineProperty(exports, "__esModule", { value: true });
  3. exports.matchFromAbsolutePaths = exports.createMatchPath = void 0;
  4. var path = require("path");
  5. var Filesystem = require("./filesystem");
  6. var MappingEntry = require("./mapping-entry");
  7. var TryPath = require("./try-path");
  8. /**
  9. * Creates a function that can resolve paths according to tsconfig paths property.
  10. * @param absoluteBaseUrl Absolute version of baseUrl as specified in tsconfig.
  11. * @param paths The paths as specified in tsconfig.
  12. * @param mainFields A list of package.json field names to try when resolving module files.
  13. * @param addMatchAll Add a match-all "*" rule if none is present
  14. * @returns a function that can resolve paths.
  15. */
  16. function createMatchPath(absoluteBaseUrl, paths, mainFields, addMatchAll) {
  17. if (mainFields === void 0) { mainFields = ["main"]; }
  18. if (addMatchAll === void 0) { addMatchAll = true; }
  19. var absolutePaths = MappingEntry.getAbsoluteMappingEntries(absoluteBaseUrl, paths, addMatchAll);
  20. return function (requestedModule, readJson, fileExists, extensions) {
  21. return matchFromAbsolutePaths(absolutePaths, requestedModule, readJson, fileExists, extensions, mainFields);
  22. };
  23. }
  24. exports.createMatchPath = createMatchPath;
  25. /**
  26. * Finds a path from tsconfig that matches a module load request.
  27. * @param absolutePathMappings The paths to try as specified in tsconfig but resolved to absolute form.
  28. * @param requestedModule The required module name.
  29. * @param readJson Function that can read json from a path (useful for testing).
  30. * @param fileExists Function that checks for existence of a file at a path (useful for testing).
  31. * @param extensions File extensions to probe for (useful for testing).
  32. * @param mainFields A list of package.json field names to try when resolving module files.
  33. * @returns the found path, or undefined if no path was found.
  34. */
  35. function matchFromAbsolutePaths(absolutePathMappings, requestedModule, readJson, fileExists, extensions, mainFields) {
  36. if (readJson === void 0) { readJson = Filesystem.readJsonFromDiskSync; }
  37. if (fileExists === void 0) { fileExists = Filesystem.fileExistsSync; }
  38. if (extensions === void 0) { extensions = Object.keys(require.extensions); }
  39. if (mainFields === void 0) { mainFields = ["main"]; }
  40. var tryPaths = TryPath.getPathsToTry(extensions, absolutePathMappings, requestedModule);
  41. if (!tryPaths) {
  42. return undefined;
  43. }
  44. return findFirstExistingPath(tryPaths, readJson, fileExists, mainFields);
  45. }
  46. exports.matchFromAbsolutePaths = matchFromAbsolutePaths;
  47. function findFirstExistingMainFieldMappedFile(packageJson, mainFields, packageJsonPath, fileExists) {
  48. for (var index = 0; index < mainFields.length; index++) {
  49. var mainFieldName = mainFields[index];
  50. var candidateMapping = packageJson[mainFieldName];
  51. if (candidateMapping && typeof candidateMapping === "string") {
  52. var candidateFilePath = path.join(path.dirname(packageJsonPath), candidateMapping);
  53. if (fileExists(candidateFilePath)) {
  54. return candidateFilePath;
  55. }
  56. }
  57. }
  58. return undefined;
  59. }
  60. function findFirstExistingPath(tryPaths, readJson, fileExists, mainFields) {
  61. if (readJson === void 0) { readJson = Filesystem.readJsonFromDiskSync; }
  62. if (mainFields === void 0) { mainFields = ["main"]; }
  63. for (var _i = 0, tryPaths_1 = tryPaths; _i < tryPaths_1.length; _i++) {
  64. var tryPath = tryPaths_1[_i];
  65. if (tryPath.type === "file" ||
  66. tryPath.type === "extension" ||
  67. tryPath.type === "index") {
  68. if (fileExists(tryPath.path)) {
  69. return TryPath.getStrippedPath(tryPath);
  70. }
  71. }
  72. else if (tryPath.type === "package") {
  73. var packageJson = readJson(tryPath.path);
  74. if (packageJson) {
  75. var mainFieldMappedFile = findFirstExistingMainFieldMappedFile(packageJson, mainFields, tryPath.path, fileExists);
  76. if (mainFieldMappedFile) {
  77. return mainFieldMappedFile;
  78. }
  79. }
  80. }
  81. else {
  82. TryPath.exhaustiveTypeException(tryPath.type);
  83. }
  84. }
  85. return undefined;
  86. }
  87. //# sourceMappingURL=match-path-sync.js.map