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diff --git a/‎src/compiler/checker.ts
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+1-1Lines changed: 1 addition & 1 deletion b/‎src/compiler/checker.ts
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+1-1Lines changed: 1 addition & 1 deletion
diff --git a/‎src/compiler/moduleNameResolver.ts
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+33-10Lines changed: 33 additions & 10 deletions b/‎src/compiler/moduleNameResolver.ts
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+33-10Lines changed: 33 additions & 10 deletions
diff --git a/‎src/compiler/types.ts
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+5-1Lines changed: 5 additions & 1 deletion b/‎src/compiler/types.ts
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+5-1Lines changed: 5 additions & 1 deletion
diff --git a/‎src/compiler/utilities.ts
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+70-11Lines changed: 70 additions & 11 deletions b/‎src/compiler/utilities.ts
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+70-11Lines changed: 70 additions & 11 deletions
diff --git a/‎src/harness/client.ts
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+18-1Lines changed: 18 additions & 1 deletion b/‎src/harness/client.ts
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+18-1Lines changed: 18 additions & 1 deletion
@@ -9206,7 +9206,7 @@ namespace ts {
                         }
                     }
                     const sourceTypes = some(constructorTypes, t => !!(t.flags & ~TypeFlags.Nullable)) ? constructorTypes : types; // TODO: GH#18217
-                    type = getUnionType(sourceTypes!, UnionReduction.Subtype);
+                    type = getUnionType(sourceTypes!);
                 }
             }
             const widened = getWidenedType(addOptionality(type, /*isProperty*/ false, definedInMethod && !definedInConstructor));
 
@@ -69,7 +69,8 @@ namespace ts {
         JavaScript, /** '.js' or '.jsx' */
         Json,       /** '.json' */
         TSConfig,   /** '.json' with `tsconfig` used instead of `index` */
-        DtsOnly /** Only '.d.ts' */
+        DtsOnly,    /** Only '.d.ts' */
+        TsOnly,     /** '.[cm]tsx?' but not .d.ts variants */
     }
 
     interface PathAndPackageId {
@@ -1290,7 +1291,19 @@ namespace ts {
     export function nodeModuleNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache, redirectedReference?: ResolvedProjectReference): ResolvedModuleWithFailedLookupLocations;
     /* @internal */ export function nodeModuleNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache, redirectedReference?: ResolvedProjectReference, lookupConfig?: boolean): ResolvedModuleWithFailedLookupLocations; // eslint-disable-line @typescript-eslint/unified-signatures
     export function nodeModuleNameResolver(moduleName: string, containingFile: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache?: ModuleResolutionCache, redirectedReference?: ResolvedProjectReference, lookupConfig?: boolean): ResolvedModuleWithFailedLookupLocations {
-        return nodeModuleNameResolverWorker(NodeResolutionFeatures.None, moduleName, getDirectoryPath(containingFile), compilerOptions, host, cache, lookupConfig ? tsconfigExtensions : (compilerOptions.resolveJsonModule ? tsPlusJsonExtensions : tsExtensions), redirectedReference);
+        let extensions;
+        if (lookupConfig) {
+            extensions = tsconfigExtensions;
+        }
+        else if (compilerOptions.noDtsResolution) {
+            extensions = [Extensions.TsOnly];
+            if (compilerOptions.allowJs) extensions.push(Extensions.JavaScript);
+            if (compilerOptions.resolveJsonModule) extensions.push(Extensions.Json);
+        }
+        else {
+            extensions = compilerOptions.resolveJsonModule ? tsPlusJsonExtensions : tsExtensions;
+        }
+        return nodeModuleNameResolverWorker(NodeResolutionFeatures.None, moduleName, getDirectoryPath(containingFile), compilerOptions, host, cache, extensions, redirectedReference);
     }
 
     function nodeModuleNameResolverWorker(features: NodeResolutionFeatures, moduleName: string, containingDirectory: string, compilerOptions: CompilerOptions, host: ModuleResolutionHost, cache: ModuleResolutionCache | undefined, extensions: Extensions[], redirectedReference: ResolvedProjectReference | undefined): ResolvedModuleWithFailedLookupLocations {
@@ -1299,14 +1312,19 @@ namespace ts {
         const failedLookupLocations: string[] = [];
         // conditions are only used by the node12/nodenext resolver - there's no priority order in the list,
         //it's essentially a set (priority is determined by object insertion order in the object we look at).
+        const conditions = features & NodeResolutionFeatures.EsmMode ? ["node", "import", "types"] : ["node", "require", "types"];
+        if (compilerOptions.noDtsResolution) {
+            conditions.pop();
+        }
+
         const state: ModuleResolutionState = {
             compilerOptions,
             host,
             traceEnabled,
             failedLookupLocations,
             packageJsonInfoCache: cache,
             features,
-            conditions: features & NodeResolutionFeatures.EsmMode ? ["node", "import", "types"] : ["node", "require", "types"]
+            conditions,
         };
 
         const result = forEach(extensions, ext => tryResolve(ext));
@@ -1533,20 +1551,22 @@ namespace ts {
                     default: return tryExtension(Extension.Dts);
                 }
             case Extensions.TypeScript:
+            case Extensions.TsOnly:
+                const useDts = extensions === Extensions.TypeScript;
                 switch (originalExtension) {
                     case Extension.Mjs:
                     case Extension.Mts:
                     case Extension.Dmts:
-                        return tryExtension(Extension.Mts) || tryExtension(Extension.Dmts);
+                        return tryExtension(Extension.Mts) || (useDts ? tryExtension(Extension.Dmts) : undefined);
                     case Extension.Cjs:
                     case Extension.Cts:
                     case Extension.Dcts:
-                        return tryExtension(Extension.Cts) || tryExtension(Extension.Dcts);
+                        return tryExtension(Extension.Cts) || (useDts ? tryExtension(Extension.Dcts) : undefined);
                     case Extension.Json:
                         candidate += Extension.Json;
-                        return tryExtension(Extension.Dts);
+                        return useDts ? tryExtension(Extension.Dts) : undefined;
                     default:
-                        return tryExtension(Extension.Ts) || tryExtension(Extension.Tsx) || tryExtension(Extension.Dts);
+                        return tryExtension(Extension.Ts) || tryExtension(Extension.Tsx) || (useDts ? tryExtension(Extension.Dts) : undefined);
                 }
             case Extensions.JavaScript:
                 switch (originalExtension) {
@@ -1813,6 +1833,7 @@ namespace ts {
             switch (extensions) {
                 case Extensions.JavaScript:
                 case Extensions.Json:
+                case Extensions.TsOnly:
                     packageFile = readPackageJsonMainField(jsonContent, candidate, state);
                     break;
                 case Extensions.TypeScript:
@@ -1893,14 +1914,16 @@ namespace ts {
     function extensionIsOk(extensions: Extensions, extension: Extension): boolean {
         switch (extensions) {
             case Extensions.JavaScript:
-                return extension === Extension.Js || extension === Extension.Jsx;
+                return extension === Extension.Js || extension === Extension.Jsx || extension === Extension.Mjs || extension === Extension.Cjs;
             case Extensions.TSConfig:
             case Extensions.Json:
                 return extension === Extension.Json;
             case Extensions.TypeScript:
-                return extension === Extension.Ts || extension === Extension.Tsx || extension === Extension.Dts;
+                return extension === Extension.Ts || extension === Extension.Tsx || extension === Extension.Mts || extension === Extension.Cts || extension === Extension.Dts || extension === Extension.Dmts || extension === Extension.Dcts;
+            case Extensions.TsOnly:
+                return extension === Extension.Ts || extension === Extension.Tsx || extension === Extension.Mts || extension === Extension.Cts;
             case Extensions.DtsOnly:
-                return extension === Extension.Dts;
+                return extension === Extension.Dts || extension === Extension.Dmts || extension === Extension.Dcts;
         }
     }
 
 
@@ -4668,8 +4668,10 @@ namespace ts {
     export type AnyImportOrRequire = AnyImportSyntax | VariableDeclarationInitializedTo<RequireOrImportCall>;
 
     /* @internal */
-    export type AnyImportOrRequireStatement = AnyImportSyntax | RequireVariableStatement;
+    export type AnyImportOrBareOrAccessedRequire = AnyImportSyntax | VariableDeclarationInitializedTo<RequireOrImportCall | AccessExpression>;
 
+    /* @internal */
+    export type AnyImportOrRequireStatement = AnyImportSyntax | RequireVariableStatement;
 
     /* @internal */
     export type AnyImportOrReExport = AnyImportSyntax | ExportDeclaration;
@@ -6178,6 +6180,8 @@ namespace ts {
         assumeChangesOnlyAffectDirectDependencies?: boolean;
         noLib?: boolean;
         noResolve?: boolean;
+        /*@internal*/
+        noDtsResolution?: boolean;
         noUncheckedIndexedAccess?: boolean;
         out?: string;
         outDir?: string;
 
@@ -933,6 +933,10 @@ namespace ts {
         }
     }
 
+    export function isAnyImportOrBareOrAccessedRequire(node: Node): node is AnyImportOrBareOrAccessedRequire {
+        return isAnyImportSyntax(node) || isVariableDeclarationInitializedToBareOrAccessedRequire(node);
+    }
+
     export function isLateVisibilityPaintedStatement(node: Node): node is LateVisibilityPaintedStatement {
         switch (node.kind) {
             case SyntaxKind.ImportDeclaration:
@@ -2558,14 +2562,14 @@ namespace ts {
         return decl.kind === SyntaxKind.FunctionDeclaration || isVariableDeclaration(decl) && decl.initializer && isFunctionLike(decl.initializer);
     }
 
-    export function tryGetModuleSpecifierFromDeclaration(node: AnyImportOrRequire): string | undefined {
+    export function tryGetModuleSpecifierFromDeclaration(node: AnyImportOrBareOrAccessedRequire): StringLiteralLike | undefined {
         switch (node.kind) {
             case SyntaxKind.VariableDeclaration:
-                return node.initializer.arguments[0].text;
+                return findAncestor(node.initializer, (node): node is RequireOrImportCall => isRequireCall(node, /*requireStringLiteralLikeArgument*/ true))?.arguments[0];
             case SyntaxKind.ImportDeclaration:
-                return tryCast(node.moduleSpecifier, isStringLiteralLike)?.text;
+                return tryCast(node.moduleSpecifier, isStringLiteralLike);
             case SyntaxKind.ImportEqualsDeclaration:
-                return tryCast(tryCast(node.moduleReference, isExternalModuleReference)?.expression, isStringLiteralLike)?.text;
+                return tryCast(tryCast(node.moduleReference, isExternalModuleReference)?.expression, isStringLiteralLike);
             default:
                 Debug.assertNever(node);
         }
@@ -3131,21 +3135,31 @@ namespace ts {
     // export = <EntityNameExpression>
     // export default <EntityNameExpression>
     // module.exports = <EntityNameExpression>
-    // {<Identifier>}
-    // {name: <EntityNameExpression>}
+    // module.exports.x = <EntityNameExpression>
+    // const x = require("...")
+    // const { x } = require("...")
+    // const x = require("...").y
+    // const { x } = require("...").y
     export function isAliasSymbolDeclaration(node: Node): boolean {
-        return node.kind === SyntaxKind.ImportEqualsDeclaration ||
+        if (node.kind === SyntaxKind.ImportEqualsDeclaration ||
             node.kind === SyntaxKind.NamespaceExportDeclaration ||
             node.kind === SyntaxKind.ImportClause && !!(node as ImportClause).name ||
             node.kind === SyntaxKind.NamespaceImport ||
             node.kind === SyntaxKind.NamespaceExport ||
             node.kind === SyntaxKind.ImportSpecifier ||
             node.kind === SyntaxKind.ExportSpecifier ||
-            node.kind === SyntaxKind.ExportAssignment && exportAssignmentIsAlias(node as ExportAssignment) ||
+            node.kind === SyntaxKind.ExportAssignment && exportAssignmentIsAlias(node as ExportAssignment)
+        ) {
+            return true;
+        }
+
+        return isInJSFile(node) && (
             isBinaryExpression(node) && getAssignmentDeclarationKind(node) === AssignmentDeclarationKind.ModuleExports && exportAssignmentIsAlias(node) ||
-            isPropertyAccessExpression(node) && isBinaryExpression(node.parent) && node.parent.left === node && node.parent.operatorToken.kind === SyntaxKind.EqualsToken && isAliasableExpression(node.parent.right) ||
-            node.kind === SyntaxKind.ShorthandPropertyAssignment ||
-            node.kind === SyntaxKind.PropertyAssignment && isAliasableExpression((node as PropertyAssignment).initializer);
+            isPropertyAccessExpression(node)
+                && isBinaryExpression(node.parent)
+                && node.parent.left === node
+                && node.parent.operatorToken.kind === SyntaxKind.EqualsToken
+                && isAliasableExpression(node.parent.right));
     }
 
     export function getAliasDeclarationFromName(node: EntityName): Declaration | undefined {
@@ -3156,6 +3170,7 @@ namespace ts {
             case SyntaxKind.ExportSpecifier:
             case SyntaxKind.ExportAssignment:
             case SyntaxKind.ImportEqualsDeclaration:
+            case SyntaxKind.NamespaceExport:
                 return node.parent as Declaration;
             case SyntaxKind.QualifiedName:
                 do {
@@ -5142,6 +5157,11 @@ namespace ts {
             (node.parent.kind === SyntaxKind.PropertyAccessExpression && (node.parent as PropertyAccessExpression).name === node);
     }
 
+    export function isRightSideOfAccessExpression(node: Node) {
+        return isPropertyAccessExpression(node.parent) && node.parent.name === node
+            || isElementAccessExpression(node.parent) && node.parent.argumentExpression === node;
+    }
+
     export function isRightSideOfQualifiedNameOrPropertyAccessOrJSDocMemberName(node: Node) {
         return isQualifiedName(node.parent) && node.parent.right === node
             || isPropertyAccessExpression(node.parent) && node.parent.name === node
@@ -5829,6 +5849,45 @@ namespace ts {
         return expr;
     }
 
+    export function forEachNameInAccessChainWalkingLeft<T>(name: MemberName | StringLiteralLike, action: (name: MemberName | StringLiteralLike) => T | undefined): T | undefined {
+        if (isAccessExpression(name.parent) && isRightSideOfAccessExpression(name)) {
+            return walkAccessExpression(name.parent);
+        }
+
+        function walkAccessExpression(access: AccessExpression): T | undefined {
+            if (access.kind === SyntaxKind.PropertyAccessExpression) {
+                const res = action(access.name);
+                if (res !== undefined) {
+                    return res;
+                }
+            }
+            else if (access.kind === SyntaxKind.ElementAccessExpression) {
+                if (isIdentifier(access.argumentExpression) || isStringLiteralLike(access.argumentExpression)) {
+                    const res = action(access.argumentExpression);
+                    if (res !== undefined) {
+                        return res;
+                    }
+                }
+                else {
+                    // Chain interrupted by non-static-name access 'x[expr()].y.z'
+                    return undefined;
+                }
+            }
+
+            if (isAccessExpression(access.expression)) {
+                return walkAccessExpression(access.expression);
+            }
+            if (isIdentifier(access.expression)) {
+                // End of chain at Identifier 'x.y.z'
+                return action(access.expression);
+            }
+            // End of chain at non-Identifier 'x().y.z'
+            return undefined;
+        }
+    }
+
+
+
     export function getLeftmostExpression(node: Expression, stopAtCallExpressions: boolean) {
         while (true) {
             switch (node.kind) {
 
@@ -298,7 +298,7 @@ namespace ts.server {
         getDefinitionAndBoundSpan(fileName: string, position: number): DefinitionInfoAndBoundSpan {
             const args: protocol.FileLocationRequestArgs = this.createFileLocationRequestArgs(fileName, position);
 
-            const request = this.processRequest<protocol.DefinitionRequest>(CommandNames.DefinitionAndBoundSpan, args);
+            const request = this.processRequest<protocol.DefinitionAndBoundSpanRequest>(CommandNames.DefinitionAndBoundSpan, args);
             const response = this.processResponse<protocol.DefinitionInfoAndBoundSpanResponse>(request);
             const body = Debug.checkDefined(response.body); // TODO: GH#18217
 
@@ -332,6 +332,23 @@ namespace ts.server {
             }));
         }
 
+        getSourceDefinitionAndBoundSpan(fileName: string, position: number): DefinitionInfo[] {
+            const args: protocol.FileLocationRequestArgs = this.createFileLocationRequestArgs(fileName, position);
+            const request = this.processRequest<protocol.FindSourceDefinitionRequest>(CommandNames.FindSourceDefinition, args);
+            const response = this.processResponse<protocol.DefinitionResponse>(request);
+            const body = Debug.checkDefined(response.body); // TODO: GH#18217
+
+            return body.map(entry => ({
+                containerKind: ScriptElementKind.unknown,
+                containerName: "",
+                fileName: entry.file,
+                textSpan: this.decodeSpan(entry),
+                kind: ScriptElementKind.unknown,
+                name: "",
+                unverified: entry.unverified,
+            }));
+        }
+
         getImplementationAtPosition(fileName: string, position: number): ImplementationLocation[] {
             const args = this.createFileLocationRequestArgs(fileName, position);
Original file line number	Diff line number	Diff line change
`@@ -9206,7 +9206,7 @@ namespace ts {`
`9206`	`9206`	`}`
`9207`	`9207`	`}`
`9208`	`9208`	`const sourceTypes = some(constructorTypes, t => !!(t.flags & ~TypeFlags.Nullable)) ? constructorTypes : types; // TODO: GH#18217`
`9209`		`- type = getUnionType(sourceTypes!, UnionReduction.Subtype);`
	`9209`	`+ type = getUnionType(sourceTypes!);`
`9210`	`9210`	`}`
`9211`	`9211`	`}`
`9212`	`9212`	`const widened = getWidenedType(addOptionality(type, /isProperty/ false, definedInMethod && !definedInConstructor));`