merge completed... now to fix all the bugs...

node_modules/tsconfig-paths/src/mapping-entry.ts

@@ -0,0 +1,64 @@
+import * as path from "path";
+
+export interface MappingEntry {
+  readonly pattern: string;
+  readonly paths: ReadonlyArray<string>;
+}
+
+export interface Paths {
+  readonly [key: string]: ReadonlyArray<string>;
+}
+
+/**
+ * Converts an absolute baseUrl and paths to an array of absolute mapping entries.
+ * The array is sorted by longest prefix.
+ * Having an array with entries allows us to keep a sorting order rather than
+ * sort by keys each time we use the mappings.
+ * @param absoluteBaseUrl
+ * @param paths
+ * @param addMatchAll
+ */
+export function getAbsoluteMappingEntries(
+  absoluteBaseUrl: string,
+  paths: Paths,
+  addMatchAll: boolean
+): ReadonlyArray<MappingEntry> {
+  // Resolve all paths to absolute form once here, and sort them by
+  // longest prefix once here, this saves time on each request later.
+  // We need to put them in an array to preserve the sorting order.
+  const sortedKeys = sortByLongestPrefix(Object.keys(paths));
+  const absolutePaths: Array<MappingEntry> = [];
+  for (const key of sortedKeys) {
+    absolutePaths.push({
+      pattern: key,
+      paths: paths[key].map((pathToResolve) =>
+        path.join(absoluteBaseUrl, pathToResolve)
+      ),
+    });
+  }
+  // If there is no match-all path specified in the paths section of tsconfig, then try to match
+  // all paths relative to baseUrl, this is how typescript works.
+  if (!paths["*"] && addMatchAll) {
+    absolutePaths.push({
+      pattern: "*",
+      paths: [`${absoluteBaseUrl.replace(/\/$/, "")}/*`],
+    });
+  }
+
+  return absolutePaths;
+}
+
+/**
+ * Sort path patterns.
+ * If a module name can be matched with multiple patterns then pattern with the longest prefix will be picked.
+ */
+function sortByLongestPrefix(arr: Array<string>): Array<string> {
+  return arr
+    .concat()
+    .sort((a: string, b: string) => getPrefixLength(b) - getPrefixLength(a));
+}
+
+function getPrefixLength(pattern: string): number {
+  const prefixLength = pattern.indexOf("*");
+  return pattern.substr(0, prefixLength).length;
+}