Gate #/ subpath imports on NodeNext and Bundler module resolution modes

Author: magic-akari

src/compiler/moduleNameResolver.ts

@@ -1690,13 +1690,16 @@ export enum NodeResolutionFeatures {
     // allowing `*` in the LHS of an export to be followed by more content, eg `"./whatever/*.js"`
     // not supported in node 12 - https://github.com/nodejs/Release/issues/690
     ExportsPatternTrailers = 1 << 4,
-    AllFeatures = Imports | SelfName | Exports | ExportsPatternTrailers,
+    // allowing `#/` root imports in package.json imports field
+    // not supported until mass adoption - https://github.com/nodejs/node/pull/60864
+    ImportsPatternRoot = 1 << 6,
+    AllFeatures = Imports | SelfName | Exports | ExportsPatternTrailers | ImportsPatternRoot,
 
     Node16Default = Imports | SelfName | Exports | ExportsPatternTrailers,
 
     NodeNextDefault = AllFeatures,
 
-    BundlerDefault = Imports | SelfName | Exports | ExportsPatternTrailers,
+    BundlerDefault = Imports | SelfName | Exports | ExportsPatternTrailers | ImportsPatternRoot,
 
     EsmMode = 1 << 5,
 }
@@ -2646,7 +2649,7 @@ function loadModuleFromExports(scope: PackageJsonInfo, extensions: Extensions, s
 }
 
 function loadModuleFromImports(extensions: Extensions, moduleName: string, directory: string, state: ModuleResolutionState, cache: ModuleResolutionCache | undefined, redirectedReference: ResolvedProjectReference | undefined): SearchResult<Resolved> {
-    if (moduleName === "#") {
+    if (moduleName === "#" || (startsWith(moduleName, "#/") && !(state.features & NodeResolutionFeatures.ImportsPatternRoot))) {
         if (state.traceEnabled) {
             trace(state.host, Diagnostics.Invalid_import_specifier_0_has_no_possible_resolutions, moduleName);
         }