Fix auto-import of subpath imports starting with #/ in supported module resolution modes

internal/fourslash/tests/autoImportPackageJsonImportsHashSlash_test.go

@@ -0,0 +1,61 @@
+package fourslash_test
+
+import (
+	"testing"
+
+	"github.com/microsoft/typescript-go/internal/fourslash"
+	"github.com/microsoft/typescript-go/internal/testutil"
+)
+
+func TestAutoImportPackageJsonImportsHashSlashNodenext(t *testing.T) {
+	t.Parallel()
+	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
+	const content = `// @Filename: /tsconfig.json
+{
+  "compilerOptions": {
+    "module": "nodenext",
+    "rootDir": "./",
+    "outDir": "build"
+  }
+}
+// @Filename: /package.json
+{
+  "imports": {
+    "#/*": {
+      "types": "./src/*",
+      "default": "./src/*"
+    }
+  }
+}
+// @Filename: /src/domain/entities/entity.ts
+export const entity = 1;
+// @Filename: /src/features/deep/consumer.ts
+entit/**/`
+	f, done := fourslash.NewFourslash(t, nil /*capabilities*/, content)
+	defer done()
+	f.BaselineAutoImportsCompletions(t, []string{""})
+}
+
+func TestAutoImportPackageJsonImportsHashSlashNode16(t *testing.T) {
+	t.Parallel()
+	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
+	const content = `// @Filename: /tsconfig.json
+{
+  "compilerOptions": {
+    "module": "node16"
+  }
+}
+// @Filename: /package.json
+{
+  "imports": {
+    "#/*": "./src/*"
+  }
+}
+// @Filename: /src/domain/entities/entity.ts
+export const entity = 1;
+// @Filename: /src/consumer.ts
+entit/**/`
+	f, done := fourslash.NewFourslash(t, nil /*capabilities*/, content)
+	defer done()
+	f.BaselineAutoImportsCompletions(t, []string{""})
+}

internal/modulespecifiers/specifiers.go

@@ -1031,9 +1031,12 @@ func tryGetModuleNameFromPackageJsonImports(
 		top := imports.AsObject()
 		entries := top.Entries()
 		for k, value := range entries {
-			if !strings.HasPrefix(k, "#") || k == "#" || strings.HasPrefix(k, "#/") {
+			if k == "#" || k == "#/" || !strings.HasPrefix(k, "#") {
 				continue // invalid imports entry
 			}
+			if strings.HasPrefix(k, "#/") && options.GetModuleResolutionKind() != core.ModuleResolutionKindNodeNext && options.GetModuleResolutionKind() != core.ModuleResolutionKindBundler {
+				continue // "#/" imports keys are only valid in nodenext/bundler
+			}
 			mode := MatchingModeExact
 			if strings.HasSuffix(k, "/") {
 				mode = MatchingModeDirectory

testdata/baselines/reference/fourslash/autoImports/autoImportPackageJsonImportsHashSlashNode16.baseline.md

@@ -0,0 +1,10 @@
+// === Auto Imports === 
+```ts
+// @FileName: /src/consumer.ts
+entit/**/
+``````ts
+import { entity } from "./domain/entities/entity";
+
+entit
+```
+

testdata/baselines/reference/fourslash/autoImports/autoImportPackageJsonImportsHashSlashNodenext.baseline.md

@@ -0,0 +1,10 @@
+// === Auto Imports === 
+```ts
+// @FileName: /src/features/deep/consumer.ts
+entit/**/
+``````ts
+import { entity } from "#/domain/entities/entity.js";
+
+entit
+```
+