moduleSpecifiers: Allow "*" as a path mapping (#25881)

Author: Andy

Diff for: src/compiler/moduleSpecifiers.ts

@@ -218,10 +218,7 @@ namespace ts.moduleSpecifiers {
             for (const patternText of paths[key]) {
                 const pattern = removeFileExtension(normalizePath(patternText));
                 const indexOfStar = pattern.indexOf("*");
-                if (indexOfStar === 0 && pattern.length === 1) {
-                    continue;
-                }
-                else if (indexOfStar !== -1) {
+                if (indexOfStar !== -1) {
                     const prefix = pattern.substr(0, indexOfStar);
                     const suffix = pattern.substr(indexOfStar + 1);
                     if (relativeToBaseUrl.length >= prefix.length + suffix.length &&

Diff for: tests/cases/fourslash/importNameCodeFix_fromPathMapping.ts

@@ -0,0 +1,24 @@
+/// <reference path="fourslash.ts" />
+
+// @Filename: /a.ts
+////export const foo = 0;
+
+// @Filename: /b.ts
+////foo;
+
+// @Filename: /tsconfig.json
+////{
+////    "compilerOptions": {
+////        "baseUrl": ".",
+////        "paths": {
+////            "@root/*": ["*"],
+////        }
+////    }
+////}
+
+goTo.file("/b.ts");
+verify.importFixAtPosition([
+`import { foo } from "@root/a";
+
+foo;`,
+]);