diff --git a/lib/tsc.js b/lib/tsc.js
index f1380f4ecf2ec..f7e464aa28ed8 100644
--- a/lib/tsc.js
+++ b/lib/tsc.js
@@ -18,7 +18,7 @@ and limitations under the License.
 
 // src/compiler/corePublic.ts
 var versionMajorMinor = "5.1";
-var version = "5.1.4";
+var version = "5.1.5";
 
 // src/compiler/core.ts
 var emptyArray = [];
@@ -60584,7 +60584,6 @@ function createTypeChecker(host) {
       } else if (targetFlags & 8388608 /* IndexedAccess */) {
         if (sourceFlags & 8388608 /* IndexedAccess */) {
           if (result2 = isRelatedTo(source2.objectType, target2.objectType, 3 /* Both */, reportErrors2)) {
-            instantiateType(source2.objectType, reportUnreliableMapper);
             result2 &= isRelatedTo(source2.indexType, target2.indexType, 3 /* Both */, reportErrors2);
           }
           if (result2) {
diff --git a/lib/tsserver.js b/lib/tsserver.js
index 0d87a1c790788..8c682afa1d190 100644
--- a/lib/tsserver.js
+++ b/lib/tsserver.js
@@ -2304,7 +2304,7 @@ module.exports = __toCommonJS(server_exports);
 
 // src/compiler/corePublic.ts
 var versionMajorMinor = "5.1";
-var version = "5.1.4";
+var version = "5.1.5";
 var Comparison = /* @__PURE__ */ ((Comparison3) => {
   Comparison3[Comparison3["LessThan"] = -1] = "LessThan";
   Comparison3[Comparison3["EqualTo"] = 0] = "EqualTo";
@@ -65235,7 +65235,6 @@ function createTypeChecker(host) {
       } else if (targetFlags & 8388608 /* IndexedAccess */) {
         if (sourceFlags & 8388608 /* IndexedAccess */) {
           if (result2 = isRelatedTo(source2.objectType, target2.objectType, 3 /* Both */, reportErrors2)) {
-            instantiateType(source2.objectType, reportUnreliableMapper);
             result2 &= isRelatedTo(source2.indexType, target2.indexType, 3 /* Both */, reportErrors2);
           }
           if (result2) {
@@ -156314,7 +156313,7 @@ function getSourceFromOrigin(origin) {
 }
 function getCompletionEntriesFromSymbols(symbols, entries, replacementToken, contextToken, location, position, sourceFile, host, program, target, log, kind, preferences, compilerOptions, formatContext, isTypeOnlyLocation, propertyAccessToConvert, jsxIdentifierExpected, isJsxInitializer, importStatementCompletion, recommendedCompletion, symbolToOriginInfoMap, symbolToSortTextMap, isJsxIdentifierExpected, isRightOfOpenTag, includeSymbol = false) {
   const start2 = timestamp();
-  const variableOrParameterDeclaration = getVariableOrParameterDeclaration(contextToken);
+  const variableOrParameterDeclaration = getVariableOrParameterDeclaration(contextToken, location);
   const useSemicolons = probablyUsesSemicolons(sourceFile);
   const typeChecker = program.getTypeChecker();
   const uniques = /* @__PURE__ */ new Map();
@@ -158493,11 +158492,12 @@ function isModuleSpecifierMissingOrEmpty(specifier) {
     return true;
   return !((_a = tryCast(isExternalModuleReference(specifier) ? specifier.expression : specifier, isStringLiteralLike)) == null ? void 0 : _a.text);
 }
-function getVariableOrParameterDeclaration(contextToken) {
+function getVariableOrParameterDeclaration(contextToken, location) {
   if (!contextToken)
     return;
-  const declaration = findAncestor(contextToken, (node) => isFunctionBlock(node) || isArrowFunctionBody(node) || isBindingPattern(node) ? "quit" : isVariableDeclaration(node) || (isParameter(node) || isTypeParameterDeclaration(node)) && !isIndexSignatureDeclaration(node.parent));
-  return declaration;
+  const possiblyParameterDeclaration = findAncestor(contextToken, (node) => isFunctionBlock(node) || isArrowFunctionBody(node) || isBindingPattern(node) ? "quit" : (isParameter(node) || isTypeParameterDeclaration(node)) && !isIndexSignatureDeclaration(node.parent));
+  const possiblyVariableDeclaration = findAncestor(location, (node) => isFunctionBlock(node) || isArrowFunctionBody(node) || isBindingPattern(node) ? "quit" : isVariableDeclaration(node));
+  return possiblyParameterDeclaration || possiblyVariableDeclaration;
 }
 function isArrowFunctionBody(node) {
   return node.parent && isArrowFunction(node.parent) && (node.parent.body === node || // const a = () => /**/;
@@ -158739,7 +158739,7 @@ function getStringLiteralCompletionEntries(sourceFile, node, position, typeCheck
     case 290 /* JsxAttribute */:
       if (!isRequireCallArgument(node) && !isImportCall(parent2)) {
         const argumentInfo = ts_SignatureHelp_exports.getArgumentInfoForCompletions(parent2.kind === 290 /* JsxAttribute */ ? parent2.parent : node, position, sourceFile);
-        return argumentInfo && getStringLiteralCompletionsFromSignature(argumentInfo.invocation, node, argumentInfo, typeChecker) || fromContextualType();
+        return argumentInfo && getStringLiteralCompletionsFromSignature(argumentInfo.invocation, node, argumentInfo, typeChecker) || fromContextualType(0 /* None */);
       }
     case 271 /* ImportDeclaration */:
     case 277 /* ExportDeclaration */:
diff --git a/lib/tsserverlibrary.d.ts b/lib/tsserverlibrary.d.ts
index ca20adbcc9179..24685f553b407 100644
--- a/lib/tsserverlibrary.d.ts
+++ b/lib/tsserverlibrary.d.ts
@@ -5446,7 +5446,6 @@ declare namespace ts {
     type JsxAttributeValue = StringLiteral | JsxExpression | JsxElement | JsxSelfClosingElement | JsxFragment;
     interface JsxSpreadAttribute extends ObjectLiteralElement {
         readonly kind: SyntaxKind.JsxSpreadAttribute;
-        readonly name: PropertyName;
         readonly parent: JsxAttributes;
         readonly expression: Expression;
     }
diff --git a/lib/tsserverlibrary.js b/lib/tsserverlibrary.js
index b20060ffedcec..574e237d7c67f 100644
--- a/lib/tsserverlibrary.js
+++ b/lib/tsserverlibrary.js
@@ -35,7 +35,7 @@ var ts = (() => {
     "src/compiler/corePublic.ts"() {
       "use strict";
       versionMajorMinor = "5.1";
-      version = "5.1.4";
+      version = "5.1.5";
       Comparison = /* @__PURE__ */ ((Comparison3) => {
         Comparison3[Comparison3["LessThan"] = -1] = "LessThan";
         Comparison3[Comparison3["EqualTo"] = 0] = "EqualTo";
@@ -63026,7 +63026,6 @@ ${lanes.join("\n")}
         } else if (targetFlags & 8388608 /* IndexedAccess */) {
           if (sourceFlags & 8388608 /* IndexedAccess */) {
             if (result2 = isRelatedTo(source2.objectType, target2.objectType, 3 /* Both */, reportErrors2)) {
-              instantiateType(source2.objectType, reportUnreliableMapper);
               result2 &= isRelatedTo(source2.indexType, target2.indexType, 3 /* Both */, reportErrors2);
             }
             if (result2) {
@@ -155546,7 +155545,7 @@ ${newComment.split("\n").map((c) => ` * ${c}`).join("\n")}
   }
   function getCompletionEntriesFromSymbols(symbols, entries, replacementToken, contextToken, location, position, sourceFile, host, program, target, log, kind, preferences, compilerOptions, formatContext, isTypeOnlyLocation, propertyAccessToConvert, jsxIdentifierExpected, isJsxInitializer, importStatementCompletion, recommendedCompletion, symbolToOriginInfoMap, symbolToSortTextMap, isJsxIdentifierExpected, isRightOfOpenTag, includeSymbol = false) {
     const start = timestamp();
-    const variableOrParameterDeclaration = getVariableOrParameterDeclaration(contextToken);
+    const variableOrParameterDeclaration = getVariableOrParameterDeclaration(contextToken, location);
     const useSemicolons = probablyUsesSemicolons(sourceFile);
     const typeChecker = program.getTypeChecker();
     const uniques = /* @__PURE__ */ new Map();
@@ -157703,11 +157702,12 @@ ${newComment.split("\n").map((c) => ` * ${c}`).join("\n")}
       return true;
     return !((_a = tryCast(isExternalModuleReference(specifier) ? specifier.expression : specifier, isStringLiteralLike)) == null ? void 0 : _a.text);
   }
-  function getVariableOrParameterDeclaration(contextToken) {
+  function getVariableOrParameterDeclaration(contextToken, location) {
     if (!contextToken)
       return;
-    const declaration = findAncestor(contextToken, (node) => isFunctionBlock(node) || isArrowFunctionBody(node) || isBindingPattern(node) ? "quit" : isVariableDeclaration(node) || (isParameter(node) || isTypeParameterDeclaration(node)) && !isIndexSignatureDeclaration(node.parent));
-    return declaration;
+    const possiblyParameterDeclaration = findAncestor(contextToken, (node) => isFunctionBlock(node) || isArrowFunctionBody(node) || isBindingPattern(node) ? "quit" : (isParameter(node) || isTypeParameterDeclaration(node)) && !isIndexSignatureDeclaration(node.parent));
+    const possiblyVariableDeclaration = findAncestor(location, (node) => isFunctionBlock(node) || isArrowFunctionBody(node) || isBindingPattern(node) ? "quit" : isVariableDeclaration(node));
+    return possiblyParameterDeclaration || possiblyVariableDeclaration;
   }
   function isArrowFunctionBody(node) {
     return node.parent && isArrowFunction(node.parent) && (node.parent.body === node || // const a = () => /**/;
@@ -158014,7 +158014,7 @@ ${newComment.split("\n").map((c) => ` * ${c}`).join("\n")}
       case 290 /* JsxAttribute */:
         if (!isRequireCallArgument(node) && !isImportCall(parent2)) {
           const argumentInfo = ts_SignatureHelp_exports.getArgumentInfoForCompletions(parent2.kind === 290 /* JsxAttribute */ ? parent2.parent : node, position, sourceFile);
-          return argumentInfo && getStringLiteralCompletionsFromSignature(argumentInfo.invocation, node, argumentInfo, typeChecker) || fromContextualType();
+          return argumentInfo && getStringLiteralCompletionsFromSignature(argumentInfo.invocation, node, argumentInfo, typeChecker) || fromContextualType(0 /* None */);
         }
       case 271 /* ImportDeclaration */:
       case 277 /* ExportDeclaration */:
diff --git a/lib/typescript.d.ts b/lib/typescript.d.ts
index 0dae9f82541a3..ff7896ef2664f 100644
--- a/lib/typescript.d.ts
+++ b/lib/typescript.d.ts
@@ -1398,7 +1398,6 @@ declare namespace ts {
     type JsxAttributeValue = StringLiteral | JsxExpression | JsxElement | JsxSelfClosingElement | JsxFragment;
     interface JsxSpreadAttribute extends ObjectLiteralElement {
         readonly kind: SyntaxKind.JsxSpreadAttribute;
-        readonly name: PropertyName;
         readonly parent: JsxAttributes;
         readonly expression: Expression;
     }
diff --git a/lib/typescript.js b/lib/typescript.js
index d56076c2ee5b6..9a9266cacf127 100644
--- a/lib/typescript.js
+++ b/lib/typescript.js
@@ -35,7 +35,7 @@ var ts = (() => {
     "src/compiler/corePublic.ts"() {
       "use strict";
       versionMajorMinor = "5.1";
-      version = "5.1.4";
+      version = "5.1.5";
       Comparison = /* @__PURE__ */ ((Comparison3) => {
         Comparison3[Comparison3["LessThan"] = -1] = "LessThan";
         Comparison3[Comparison3["EqualTo"] = 0] = "EqualTo";
@@ -63026,7 +63026,6 @@ ${lanes.join("\n")}
         } else if (targetFlags & 8388608 /* IndexedAccess */) {
           if (sourceFlags & 8388608 /* IndexedAccess */) {
             if (result2 = isRelatedTo(source2.objectType, target2.objectType, 3 /* Both */, reportErrors2)) {
-              instantiateType(source2.objectType, reportUnreliableMapper);
               result2 &= isRelatedTo(source2.indexType, target2.indexType, 3 /* Both */, reportErrors2);
             }
             if (result2) {
@@ -155561,7 +155560,7 @@ ${newComment.split("\n").map((c) => ` * ${c}`).join("\n")}
   }
   function getCompletionEntriesFromSymbols(symbols, entries, replacementToken, contextToken, location, position, sourceFile, host, program, target, log, kind, preferences, compilerOptions, formatContext, isTypeOnlyLocation, propertyAccessToConvert, jsxIdentifierExpected, isJsxInitializer, importStatementCompletion, recommendedCompletion, symbolToOriginInfoMap, symbolToSortTextMap, isJsxIdentifierExpected, isRightOfOpenTag, includeSymbol = false) {
     const start = timestamp();
-    const variableOrParameterDeclaration = getVariableOrParameterDeclaration(contextToken);
+    const variableOrParameterDeclaration = getVariableOrParameterDeclaration(contextToken, location);
     const useSemicolons = probablyUsesSemicolons(sourceFile);
     const typeChecker = program.getTypeChecker();
     const uniques = /* @__PURE__ */ new Map();
@@ -157718,11 +157717,12 @@ ${newComment.split("\n").map((c) => ` * ${c}`).join("\n")}
       return true;
     return !((_a = tryCast(isExternalModuleReference(specifier) ? specifier.expression : specifier, isStringLiteralLike)) == null ? void 0 : _a.text);
   }
-  function getVariableOrParameterDeclaration(contextToken) {
+  function getVariableOrParameterDeclaration(contextToken, location) {
     if (!contextToken)
       return;
-    const declaration = findAncestor(contextToken, (node) => isFunctionBlock(node) || isArrowFunctionBody(node) || isBindingPattern(node) ? "quit" : isVariableDeclaration(node) || (isParameter(node) || isTypeParameterDeclaration(node)) && !isIndexSignatureDeclaration(node.parent));
-    return declaration;
+    const possiblyParameterDeclaration = findAncestor(contextToken, (node) => isFunctionBlock(node) || isArrowFunctionBody(node) || isBindingPattern(node) ? "quit" : (isParameter(node) || isTypeParameterDeclaration(node)) && !isIndexSignatureDeclaration(node.parent));
+    const possiblyVariableDeclaration = findAncestor(location, (node) => isFunctionBlock(node) || isArrowFunctionBody(node) || isBindingPattern(node) ? "quit" : isVariableDeclaration(node));
+    return possiblyParameterDeclaration || possiblyVariableDeclaration;
   }
   function isArrowFunctionBody(node) {
     return node.parent && isArrowFunction(node.parent) && (node.parent.body === node || // const a = () => /**/;
@@ -158029,7 +158029,7 @@ ${newComment.split("\n").map((c) => ` * ${c}`).join("\n")}
       case 290 /* JsxAttribute */:
         if (!isRequireCallArgument(node) && !isImportCall(parent2)) {
           const argumentInfo = ts_SignatureHelp_exports.getArgumentInfoForCompletions(parent2.kind === 290 /* JsxAttribute */ ? parent2.parent : node, position, sourceFile);
-          return argumentInfo && getStringLiteralCompletionsFromSignature(argumentInfo.invocation, node, argumentInfo, typeChecker) || fromContextualType();
+          return argumentInfo && getStringLiteralCompletionsFromSignature(argumentInfo.invocation, node, argumentInfo, typeChecker) || fromContextualType(0 /* None */);
         }
       case 271 /* ImportDeclaration */:
       case 277 /* ExportDeclaration */:
diff --git a/lib/typingsInstaller.js b/lib/typingsInstaller.js
index d3cf1506449e9..a668ca7364c02 100644
--- a/lib/typingsInstaller.js
+++ b/lib/typingsInstaller.js
@@ -54,7 +54,7 @@ var path = __toESM(require("path"));
 
 // src/compiler/corePublic.ts
 var versionMajorMinor = "5.1";
-var version = "5.1.4";
+var version = "5.1.5";
 
 // src/compiler/core.ts
 var emptyArray = [];
diff --git a/package.json b/package.json
index d364bedf7b6e1..164ad0ae67627 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
     "name": "typescript",
     "author": "Microsoft Corp.",
     "homepage": "https://www.typescriptlang.org/",
-    "version": "5.1.4",
+    "version": "5.1.5",
     "license": "Apache-2.0",
     "description": "TypeScript is a language for application scale JavaScript development",
     "keywords": [
diff --git a/src/compiler/corePublic.ts b/src/compiler/corePublic.ts
index 4e01d23815da8..934c20d2e2c5f 100644
--- a/src/compiler/corePublic.ts
+++ b/src/compiler/corePublic.ts
@@ -4,7 +4,7 @@ export const versionMajorMinor = "5.1";
 // The following is baselined as a literal template type without intervention
 /** The version of the TypeScript compiler release */
 // eslint-disable-next-line @typescript-eslint/no-inferrable-types
-export const version = "5.1.4" as string;
+export const version = "5.1.5" as string;
 
 /**
  * Type of objects whose values are all of the same type.