Monomorphic flag calculation and property access for name/jsDoc

src/compiler/nodes.ts

@@ -52,6 +52,7 @@ import {
     FunctionExpression,
     FunctionTypeNode,
     GetAccessorDeclaration,
+    HasJSDoc,
     HasLocals,
     HasName,
     HeritageClause,
@@ -235,6 +236,14 @@ import {
     ];
 }
 
+{
+    // eslint-disable-next-line @typescript-eslint/naming-convention
+    type _ = [
+        __Expect<HasJSDoc, Extract<Nodes, { jsDoc: any }>>,
+        __Expect<Extract<Nodes, { jsDoc: any }>, HasJSDoc>,
+    ];
+}
+
 // Registry
 
 /**

src/compiler/parser.ts

@@ -59,6 +59,7 @@ import {
     AstFunctionExpression,
     AstFunctionOrConstructorTypeNode,
     AstHasJSDoc,
+    astHasJSDoc,
     astHasJSDocNodes,
     AstHasModifiers,
     AstHeritageClause,
@@ -183,6 +184,7 @@ import {
     AstReadonlyKeyword,
     AstReturnStatement,
     AstSatisfiesExpression,
+    astSetJSDoc,
     AstShorthandPropertyAssignment,
     AstSourceFile,
     AstStatement,
@@ -938,12 +940,12 @@ namespace Parser {
             return node;
         }
 
-        Debug.assert(!node.data.jsDoc); // Should only be called once per node
+        Debug.assert(!astHasJSDoc(node)); // Should only be called once per node
         const jsDoc = mapDefined(getJSDocCommentRanges(node, sourceText), comment => JSDocParser.parseJSDocComment(node, comment.pos, comment.end - comment.pos)?.node); // TODO(rbuckton): do not instantiate .node
-        if (jsDoc.length) node.data.jsDoc = jsDoc;
+        if (jsDoc.length) astSetJSDoc(node, jsDoc);
         if (hasDeprecatedTag) {
             hasDeprecatedTag = false;
-            (node as Mutable<T>).flags |= NodeFlags.Deprecated;
+            node.flags |= NodeFlags.Deprecated;
         }
         return node;
     }

src/compiler/program.ts

@@ -334,6 +334,8 @@ import {
     WriteFileCallbackData,
     writeFileEnsuringDirectories,
     PartialSourceFile,
+    PackageJsonInfo,
+    JSDocParsingMode,
 } from "./_namespaces/ts.js";
 import * as performance from "./_namespaces/ts.performance.js";
 
@@ -3724,9 +3726,19 @@ export function createProgram(rootNamesOrOptions: readonly string[] | CreateProg
         const result = getImpliedNodeFormatForFileWorker(getNormalizedAbsolutePath(fileName, currentDirectory), moduleResolutionCache?.getPackageJsonInfoCache(), host, options);
         const languageVersion = getEmitScriptTarget(options);
         const setExternalModuleIndicator = getSetExternalModuleIndicator(options);
-        return typeof result === "object" ?
-            { ...result, languageVersion, setExternalModuleIndicator, jsDocParsingMode: host.jsDocParsingMode } :
-            { languageVersion, impliedNodeFormat: result, setExternalModuleIndicator, jsDocParsingMode: host.jsDocParsingMode };
+        const jsDocParsingMode = host.jsDocParsingMode;
+        let impliedNodeFormat: ResolutionMode | undefined;
+        let packageJsonLocations: readonly string[] | undefined;
+        let packageJsonScope: PackageJsonInfo | undefined;
+        if (typeof result === "object") {
+            impliedNodeFormat = result.impliedNodeFormat;
+            packageJsonLocations = result.packageJsonLocations;
+            packageJsonScope = result.packageJsonScope;
+        }
+        else {
+            impliedNodeFormat = result;
+        }
+        return { languageVersion, impliedNodeFormat, setExternalModuleIndicator, packageJsonLocations, packageJsonScope, jsDocParsingMode };
     }
 
     function findSourceFileWorker(fileName: string, isDefaultLib: boolean, ignoreNoDefaultLib: boolean, reason: FileIncludeReason, packageId: PackageId | undefined): SourceFile | undefined {