diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index f56f56223cf..2f466267f9d 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -5396,7 +5396,7 @@ namespace ts {
             return undefined;
         }
 
-        function getWidenedTypeFromAssignmentDeclaration(symbol: Symbol, resolvedSymbol?: Symbol) {
+        function getWidenedTypeForAssignmentDeclaration(symbol: Symbol, resolvedSymbol?: Symbol) {
             // function/class/{} initializers are themselves containers, so they won't merge in the same way as other initializers
             const container = getAssignedExpandoInitializer(symbol.valueDeclaration);
             if (container) {
@@ -5429,7 +5429,7 @@ namespace ts {
                     }
                 }
                 if (!isCallExpression(expression)) {
-                    jsdocType = getJSDocTypeFromAssignmentDeclaration(jsdocType, expression, symbol, declaration);
+                    jsdocType = getAnnotatedTypeForAssignmentDeclaration(jsdocType, expression, symbol, declaration);
                 }
                 if (!jsdocType) {
                     (types || (types = [])).push((isBinaryExpression(expression) || isCallExpression(expression)) ? getInitializerTypeFromAssignmentDeclaration(symbol, resolvedSymbol, expression, kind) : neverType);
@@ -5478,8 +5478,8 @@ namespace ts {
             return type;
         }
 
-        function getJSDocTypeFromAssignmentDeclaration(declaredType: Type | undefined, expression: Expression, _symbol: Symbol, declaration: Declaration) {
-            const typeNode = getJSDocType(expression.parent);
+        function getAnnotatedTypeForAssignmentDeclaration(declaredType: Type | undefined, expression: Expression, symbol: Symbol, declaration: Declaration) {
+            const typeNode = getEffectiveTypeAnnotationNode(expression.parent);
             if (typeNode) {
                 const type = getWidenedType(getTypeFromTypeNode(typeNode));
                 if (!declaredType) {
@@ -5489,6 +5489,13 @@ namespace ts {
                     errorNextVariableOrPropertyDeclarationMustHaveSameType(/*firstDeclaration*/ undefined, declaredType, declaration, type);
                 }
             }
+            if (symbol.parent) {
+                const typeNode = getEffectiveTypeAnnotationNode(symbol.parent.valueDeclaration);
+                if (typeNode) {
+                    return getTypeOfPropertyOfType(getTypeFromTypeNode(typeNode), symbol.escapedName);
+                }
+            }
+
             return declaredType;
         }
 
@@ -5783,7 +5790,7 @@ namespace ts {
             }
             else if (isInJSFile(declaration) &&
                 (isCallExpression(declaration) || isBinaryExpression(declaration) || isPropertyAccessExpression(declaration) && isBinaryExpression(declaration.parent))) {
-                type = getWidenedTypeFromAssignmentDeclaration(symbol);
+                type = getWidenedTypeForAssignmentDeclaration(symbol);
             }
             else if (isJSDocPropertyLikeTag(declaration)
                 || isPropertyAccessExpression(declaration)
@@ -5798,7 +5805,7 @@ namespace ts {
                     return getTypeOfFuncClassEnumModule(symbol);
                 }
                 type = isBinaryExpression(declaration.parent) ?
-                    getWidenedTypeFromAssignmentDeclaration(symbol) :
+                    getWidenedTypeForAssignmentDeclaration(symbol) :
                     tryGetTypeFromEffectiveTypeNode(declaration) || anyType;
             }
             else if (isPropertyAssignment(declaration)) {
@@ -5969,7 +5976,7 @@ namespace ts {
             }
             else if (declaration.kind === SyntaxKind.BinaryExpression ||
                      declaration.kind === SyntaxKind.PropertyAccessExpression && declaration.parent.kind === SyntaxKind.BinaryExpression) {
-                return getWidenedTypeFromAssignmentDeclaration(symbol);
+                return getWidenedTypeForAssignmentDeclaration(symbol);
             }
             else if (symbol.flags & SymbolFlags.ValueModule && declaration && isSourceFile(declaration) && declaration.commonJsModuleIndicator) {
                 const resolvedModule = resolveExternalModuleSymbol(symbol);
@@ -5978,7 +5985,7 @@ namespace ts {
                         return errorType;
                     }
                     const exportEquals = getMergedSymbol(symbol.exports!.get(InternalSymbolName.ExportEquals)!);
-                    const type = getWidenedTypeFromAssignmentDeclaration(exportEquals, exportEquals === resolvedModule ? undefined : resolvedModule);
+                    const type = getWidenedTypeForAssignmentDeclaration(exportEquals, exportEquals === resolvedModule ? undefined : resolvedModule);
                     if (!popTypeResolution()) {
                         return reportCircularityError(symbol);
                     }
@@ -19157,7 +19164,7 @@ namespace ts {
         }
 
         /**
-         * Woah! Do you really want to use this function?
+         * Whoa! Do you really want to use this function?
          *
          * Unless you're trying to get the *non-apparent* type for a
          * value-literal type or you're authoring relevant portions of this algorithm,
diff --git a/tests/baselines/reference/expandoFunctionContextualTypes.types b/tests/baselines/reference/expandoFunctionContextualTypes.types
index e1eca92659c..915b168776f 100644
--- a/tests/baselines/reference/expandoFunctionContextualTypes.types
+++ b/tests/baselines/reference/expandoFunctionContextualTypes.types
@@ -12,7 +12,7 @@ interface StatelessComponent<P> {
 
 const MyComponent: StatelessComponent<MyComponentProps> = () => null as any;
 >MyComponent : StatelessComponent<MyComponentProps>
->() => null as any : { (): any; defaultProps: { color: "red"; }; }
+>() => null as any : { (): any; defaultProps: Partial<MyComponentProps>; }
 >null as any : any
 >null : null
 
diff --git a/tests/baselines/reference/expandoFunctionContextualTypesJs.types b/tests/baselines/reference/expandoFunctionContextualTypesJs.types
index 081c57c0dac..82442a9db4a 100644
--- a/tests/baselines/reference/expandoFunctionContextualTypesJs.types
+++ b/tests/baselines/reference/expandoFunctionContextualTypesJs.types
@@ -10,7 +10,7 @@
   */
 const MyComponent = () => /* @type {any} */(null);
 >MyComponent : { (): any; defaultProps?: Partial<{ color: "red" | "blue"; }>; }
->() => /* @type {any} */(null) : { (): any; defaultProps: { color: "red"; }; }
+>() => /* @type {any} */(null) : { (): any; defaultProps: Partial<{ color: "red" | "blue"; }>; }
 >(null) : null
 >null : null
 
diff --git a/tests/baselines/reference/propertyAssignmentUseParentType1.js b/tests/baselines/reference/propertyAssignmentUseParentType1.js
new file mode 100644
index 00000000000..5e839a31da4
--- /dev/null
+++ b/tests/baselines/reference/propertyAssignmentUseParentType1.js
@@ -0,0 +1,26 @@
+//// [propertyAssignmentUseParentType1.ts]
+interface N {
+    (): boolean
+    num: 123;
+}
+export const interfaced: N = () => true;
+interfaced.num = 123;
+
+export const inlined: { (): boolean; nun: 456 } = () => true;
+inlined.nun = 456;
+
+export const ignoreJsdoc = () => true;
+/** @type {string} make sure to ignore jsdoc! */
+ignoreJsdoc.extra = 111
+
+
+//// [propertyAssignmentUseParentType1.js]
+"use strict";
+exports.__esModule = true;
+exports.interfaced = function () { return true; };
+exports.interfaced.num = 123;
+exports.inlined = function () { return true; };
+exports.inlined.nun = 456;
+exports.ignoreJsdoc = function () { return true; };
+/** @type {string} make sure to ignore jsdoc! */
+exports.ignoreJsdoc.extra = 111;
diff --git a/tests/baselines/reference/propertyAssignmentUseParentType1.symbols b/tests/baselines/reference/propertyAssignmentUseParentType1.symbols
new file mode 100644
index 00000000000..081e2f12604
--- /dev/null
+++ b/tests/baselines/reference/propertyAssignmentUseParentType1.symbols
@@ -0,0 +1,35 @@
+=== tests/cases/conformance/salsa/propertyAssignmentUseParentType1.ts ===
+interface N {
+>N : Symbol(N, Decl(propertyAssignmentUseParentType1.ts, 0, 0))
+
+    (): boolean
+    num: 123;
+>num : Symbol(N.num, Decl(propertyAssignmentUseParentType1.ts, 1, 15))
+}
+export const interfaced: N = () => true;
+>interfaced : Symbol(interfaced, Decl(propertyAssignmentUseParentType1.ts, 4, 12), Decl(propertyAssignmentUseParentType1.ts, 4, 40))
+>N : Symbol(N, Decl(propertyAssignmentUseParentType1.ts, 0, 0))
+
+interfaced.num = 123;
+>interfaced.num : Symbol(N.num, Decl(propertyAssignmentUseParentType1.ts, 1, 15))
+>interfaced : Symbol(interfaced, Decl(propertyAssignmentUseParentType1.ts, 4, 12), Decl(propertyAssignmentUseParentType1.ts, 4, 40))
+>num : Symbol(N.num, Decl(propertyAssignmentUseParentType1.ts, 1, 15))
+
+export const inlined: { (): boolean; nun: 456 } = () => true;
+>inlined : Symbol(inlined, Decl(propertyAssignmentUseParentType1.ts, 7, 12), Decl(propertyAssignmentUseParentType1.ts, 7, 61))
+>nun : Symbol(nun, Decl(propertyAssignmentUseParentType1.ts, 7, 36))
+
+inlined.nun = 456;
+>inlined.nun : Symbol(nun, Decl(propertyAssignmentUseParentType1.ts, 7, 36))
+>inlined : Symbol(inlined, Decl(propertyAssignmentUseParentType1.ts, 7, 12), Decl(propertyAssignmentUseParentType1.ts, 7, 61))
+>nun : Symbol(nun, Decl(propertyAssignmentUseParentType1.ts, 7, 36))
+
+export const ignoreJsdoc = () => true;
+>ignoreJsdoc : Symbol(ignoreJsdoc, Decl(propertyAssignmentUseParentType1.ts, 10, 12), Decl(propertyAssignmentUseParentType1.ts, 10, 38))
+
+/** @type {string} make sure to ignore jsdoc! */
+ignoreJsdoc.extra = 111
+>ignoreJsdoc.extra : Symbol(ignoreJsdoc.extra, Decl(propertyAssignmentUseParentType1.ts, 10, 38))
+>ignoreJsdoc : Symbol(ignoreJsdoc, Decl(propertyAssignmentUseParentType1.ts, 10, 12), Decl(propertyAssignmentUseParentType1.ts, 10, 38))
+>extra : Symbol(ignoreJsdoc.extra, Decl(propertyAssignmentUseParentType1.ts, 10, 38))
+
diff --git a/tests/baselines/reference/propertyAssignmentUseParentType1.types b/tests/baselines/reference/propertyAssignmentUseParentType1.types
new file mode 100644
index 00000000000..f3bd5010b20
--- /dev/null
+++ b/tests/baselines/reference/propertyAssignmentUseParentType1.types
@@ -0,0 +1,44 @@
+=== tests/cases/conformance/salsa/propertyAssignmentUseParentType1.ts ===
+interface N {
+    (): boolean
+    num: 123;
+>num : 123
+}
+export const interfaced: N = () => true;
+>interfaced : N
+>() => true : { (): true; num: 123; }
+>true : true
+
+interfaced.num = 123;
+>interfaced.num = 123 : 123
+>interfaced.num : 123
+>interfaced : N
+>num : 123
+>123 : 123
+
+export const inlined: { (): boolean; nun: 456 } = () => true;
+>inlined : { (): boolean; nun: 456; }
+>nun : 456
+>() => true : { (): true; nun: 456; }
+>true : true
+
+inlined.nun = 456;
+>inlined.nun = 456 : 456
+>inlined.nun : 456
+>inlined : { (): boolean; nun: 456; }
+>nun : 456
+>456 : 456
+
+export const ignoreJsdoc = () => true;
+>ignoreJsdoc : { (): boolean; extra: number; }
+>() => true : { (): boolean; extra: number; }
+>true : true
+
+/** @type {string} make sure to ignore jsdoc! */
+ignoreJsdoc.extra = 111
+>ignoreJsdoc.extra = 111 : 111
+>ignoreJsdoc.extra : number
+>ignoreJsdoc : { (): boolean; extra: number; }
+>extra : number
+>111 : 111
+
diff --git a/tests/baselines/reference/propertyAssignmentUseParentType2.errors.txt b/tests/baselines/reference/propertyAssignmentUseParentType2.errors.txt
new file mode 100644
index 00000000000..b88e276b405
--- /dev/null
+++ b/tests/baselines/reference/propertyAssignmentUseParentType2.errors.txt
@@ -0,0 +1,24 @@
+tests/cases/conformance/salsa/propertyAssignmentUseParentType2.js(11,14): error TS2322: Type '{ (): boolean; nuo: 1000; }' is not assignable to type '{ (): boolean; nuo: 789; }'.
+  Types of property 'nuo' are incompatible.
+    Type '1000' is not assignable to type '789'.
+
+
+==== tests/cases/conformance/salsa/propertyAssignmentUseParentType2.js (1 errors) ====
+    /** @type {{ (): boolean; nuo: 789 }} */
+    export const inlined = () => true
+    inlined.nuo = 789
+    
+    /** @type {{ (): boolean; nuo: 789 }} */
+    export const duplicated = () => true
+    /** @type {789} */
+    duplicated.nuo = 789
+    
+    /** @type {{ (): boolean; nuo: 789 }} */
+    export const conflictingDuplicated = () => true
+                 ~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2322: Type '{ (): boolean; nuo: 1000; }' is not assignable to type '{ (): boolean; nuo: 789; }'.
+!!! error TS2322:   Types of property 'nuo' are incompatible.
+!!! error TS2322:     Type '1000' is not assignable to type '789'.
+    /** @type {1000} */
+    conflictingDuplicated.nuo = 789
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/propertyAssignmentUseParentType2.symbols b/tests/baselines/reference/propertyAssignmentUseParentType2.symbols
new file mode 100644
index 00000000000..93b8b9290da
--- /dev/null
+++ b/tests/baselines/reference/propertyAssignmentUseParentType2.symbols
@@ -0,0 +1,30 @@
+=== tests/cases/conformance/salsa/propertyAssignmentUseParentType2.js ===
+/** @type {{ (): boolean; nuo: 789 }} */
+export const inlined = () => true
+>inlined : Symbol(inlined, Decl(propertyAssignmentUseParentType2.js, 1, 12), Decl(propertyAssignmentUseParentType2.js, 1, 33))
+
+inlined.nuo = 789
+>inlined.nuo : Symbol(nuo, Decl(propertyAssignmentUseParentType2.js, 0, 25))
+>inlined : Symbol(inlined, Decl(propertyAssignmentUseParentType2.js, 1, 12), Decl(propertyAssignmentUseParentType2.js, 1, 33))
+>nuo : Symbol(nuo, Decl(propertyAssignmentUseParentType2.js, 0, 25))
+
+/** @type {{ (): boolean; nuo: 789 }} */
+export const duplicated = () => true
+>duplicated : Symbol(duplicated, Decl(propertyAssignmentUseParentType2.js, 5, 12), Decl(propertyAssignmentUseParentType2.js, 5, 36))
+
+/** @type {789} */
+duplicated.nuo = 789
+>duplicated.nuo : Symbol(nuo, Decl(propertyAssignmentUseParentType2.js, 4, 25))
+>duplicated : Symbol(duplicated, Decl(propertyAssignmentUseParentType2.js, 5, 12), Decl(propertyAssignmentUseParentType2.js, 5, 36))
+>nuo : Symbol(nuo, Decl(propertyAssignmentUseParentType2.js, 4, 25))
+
+/** @type {{ (): boolean; nuo: 789 }} */
+export const conflictingDuplicated = () => true
+>conflictingDuplicated : Symbol(conflictingDuplicated, Decl(propertyAssignmentUseParentType2.js, 10, 12), Decl(propertyAssignmentUseParentType2.js, 10, 47))
+
+/** @type {1000} */
+conflictingDuplicated.nuo = 789
+>conflictingDuplicated.nuo : Symbol(nuo, Decl(propertyAssignmentUseParentType2.js, 9, 25))
+>conflictingDuplicated : Symbol(conflictingDuplicated, Decl(propertyAssignmentUseParentType2.js, 10, 12), Decl(propertyAssignmentUseParentType2.js, 10, 47))
+>nuo : Symbol(nuo, Decl(propertyAssignmentUseParentType2.js, 9, 25))
+
diff --git a/tests/baselines/reference/propertyAssignmentUseParentType2.types b/tests/baselines/reference/propertyAssignmentUseParentType2.types
new file mode 100644
index 00000000000..24118a9ee73
--- /dev/null
+++ b/tests/baselines/reference/propertyAssignmentUseParentType2.types
@@ -0,0 +1,42 @@
+=== tests/cases/conformance/salsa/propertyAssignmentUseParentType2.js ===
+/** @type {{ (): boolean; nuo: 789 }} */
+export const inlined = () => true
+>inlined : { (): boolean; nuo: 789; }
+>() => true : { (): boolean; nuo: 789; }
+>true : true
+
+inlined.nuo = 789
+>inlined.nuo = 789 : 789
+>inlined.nuo : 789
+>inlined : { (): boolean; nuo: 789; }
+>nuo : 789
+>789 : 789
+
+/** @type {{ (): boolean; nuo: 789 }} */
+export const duplicated = () => true
+>duplicated : { (): boolean; nuo: 789; }
+>() => true : { (): boolean; nuo: 789; }
+>true : true
+
+/** @type {789} */
+duplicated.nuo = 789
+>duplicated.nuo = 789 : 789
+>duplicated.nuo : 789
+>duplicated : { (): boolean; nuo: 789; }
+>nuo : 789
+>789 : 789
+
+/** @type {{ (): boolean; nuo: 789 }} */
+export const conflictingDuplicated = () => true
+>conflictingDuplicated : { (): boolean; nuo: 789; }
+>() => true : { (): boolean; nuo: 1000; }
+>true : true
+
+/** @type {1000} */
+conflictingDuplicated.nuo = 789
+>conflictingDuplicated.nuo = 789 : 789
+>conflictingDuplicated.nuo : 789
+>conflictingDuplicated : { (): boolean; nuo: 789; }
+>nuo : 789
+>789 : 789
+
diff --git a/tests/cases/conformance/salsa/propertyAssignmentUseParentType1.ts b/tests/cases/conformance/salsa/propertyAssignmentUseParentType1.ts
new file mode 100644
index 00000000000..500ae6f2fe3
--- /dev/null
+++ b/tests/cases/conformance/salsa/propertyAssignmentUseParentType1.ts
@@ -0,0 +1,13 @@
+interface N {
+    (): boolean
+    num: 123;
+}
+export const interfaced: N = () => true;
+interfaced.num = 123;
+
+export const inlined: { (): boolean; nun: 456 } = () => true;
+inlined.nun = 456;
+
+export const ignoreJsdoc = () => true;
+/** @type {string} make sure to ignore jsdoc! */
+ignoreJsdoc.extra = 111
diff --git a/tests/cases/conformance/salsa/propertyAssignmentUseParentType2.ts b/tests/cases/conformance/salsa/propertyAssignmentUseParentType2.ts
new file mode 100644
index 00000000000..53696abbf81
--- /dev/null
+++ b/tests/cases/conformance/salsa/propertyAssignmentUseParentType2.ts
@@ -0,0 +1,18 @@
+// @allowJs: true
+// @checkJs: true
+// @noEmit: true
+// @Filename: propertyAssignmentUseParentType2.js
+
+/** @type {{ (): boolean; nuo: 789 }} */
+export const inlined = () => true
+inlined.nuo = 789
+
+/** @type {{ (): boolean; nuo: 789 }} */
+export const duplicated = () => true
+/** @type {789} */
+duplicated.nuo = 789
+
+/** @type {{ (): boolean; nuo: 789 }} */
+export const conflictingDuplicated = () => true
+/** @type {1000} */
+conflictingDuplicated.nuo = 789