Cherry pick #50537 and #50779 to release-4.8

src/compiler/checker.ts

@@ -6094,29 +6094,19 @@ namespace ts {
                 return parameterNode;
 
                 function cloneBindingName(node: BindingName): BindingName {
-                    return elideInitializerAndPropertyRenamingAndSetEmitFlags(node) as BindingName;
-                    function elideInitializerAndPropertyRenamingAndSetEmitFlags(node: Node): Node {
+                    return elideInitializerAndSetEmitFlags(node) as BindingName;
+                    function elideInitializerAndSetEmitFlags(node: Node): Node {
                         if (context.tracker.trackSymbol && isComputedPropertyName(node) && isLateBindableName(node)) {
                             trackComputedName(node.expression, context.enclosingDeclaration, context);
                         }
-                        let visited = visitEachChild(node, elideInitializerAndPropertyRenamingAndSetEmitFlags, nullTransformationContext, /*nodesVisitor*/ undefined, elideInitializerAndPropertyRenamingAndSetEmitFlags)!;
+                        let visited = visitEachChild(node, elideInitializerAndSetEmitFlags, nullTransformationContext, /*nodesVisitor*/ undefined, elideInitializerAndSetEmitFlags)!;
                         if (isBindingElement(visited)) {
-                            if (visited.propertyName && isIdentifier(visited.propertyName) && isIdentifier(visited.name)) {
-                                visited = factory.updateBindingElement(
-                                    visited,
-                                    visited.dotDotDotToken,
-                                    /* propertyName*/ undefined,
-                                    visited.propertyName,
-                                    /*initializer*/ undefined);
-                            }
-                            else {
-                                visited = factory.updateBindingElement(
-                                    visited,
-                                    visited.dotDotDotToken,
-                                    visited.propertyName,
-                                    visited.name,
-                                    /*initializer*/ undefined);
-                            }
+                            visited = factory.updateBindingElement(
+                                visited,
+                                visited.dotDotDotToken,
+                                visited.propertyName,
+                                visited.name,
+                                /*initializer*/ undefined);
                         }
                         if (!nodeIsSynthesized(visited)) {
                             visited = factory.cloneNode(visited);

tests/baselines/reference/contextuallyTypedBindingInitializerNegative.types

@@ -5,7 +5,7 @@ interface Show {
 >x : number
 }
 function f({ show: showRename = v => v }: Show) {}
->f : ({ show }: Show) => void
+>f : ({ show: showRename }: Show) => void
 >show : any
 >showRename : (x: number) => string
 >v => v : (v: number) => number
@@ -32,7 +32,7 @@ interface Nested {
 >nested : Show
 }
 function ff({ nested: nestedRename = { show: v => v } }: Nested) {}
->ff : ({ nested }: Nested) => void
+>ff : ({ nested: nestedRename }: Nested) => void
 >nested : any
 >nestedRename : Show
 >{ show: v => v } : { show: (v: number) => number; }

tests/baselines/reference/declarationEmitBindingPatternWithReservedWord.js

@@ -0,0 +1,48 @@
+//// [declarationEmitBindingPatternWithReservedWord.ts]
+type LocaleData = Record<string, never>
+type ConvertLocaleConfig<T extends LocaleData = LocaleData> = Record<
+  string,
+  T
+>;
+type LocaleConfig<T extends LocaleData = LocaleData> = Record<string, Partial<T>>;
+
+export interface GetLocalesOptions<T extends LocaleData> {
+    app: unknown;
+    default: ConvertLocaleConfig<T>;
+    config?: LocaleConfig<T> | undefined;
+    name?: string;
+}
+
+export const getLocales = <T extends LocaleData>({
+    app,
+    name,
+    default: defaultLocalesConfig,
+    config: userLocalesConfig = {},
+}: GetLocalesOptions<T>): ConvertLocaleConfig<T> => {
+    return defaultLocalesConfig;
+};
+
+
+//// [declarationEmitBindingPatternWithReservedWord.js]
+"use strict";
+exports.__esModule = true;
+exports.getLocales = void 0;
+var getLocales = function (_a) {
+    var app = _a.app, name = _a.name, defaultLocalesConfig = _a["default"], _b = _a.config, userLocalesConfig = _b === void 0 ? {} : _b;
+    return defaultLocalesConfig;
+};
+exports.getLocales = getLocales;
+
+
+//// [declarationEmitBindingPatternWithReservedWord.d.ts]
+declare type LocaleData = Record<string, never>;
+declare type ConvertLocaleConfig<T extends LocaleData = LocaleData> = Record<string, T>;
+declare type LocaleConfig<T extends LocaleData = LocaleData> = Record<string, Partial<T>>;
+export interface GetLocalesOptions<T extends LocaleData> {
+    app: unknown;
+    default: ConvertLocaleConfig<T>;
+    config?: LocaleConfig<T> | undefined;
+    name?: string;
+}
+export declare const getLocales: <T extends LocaleData>({ app, name, default: defaultLocalesConfig, config: userLocalesConfig, }: GetLocalesOptions<T>) => ConvertLocaleConfig<T>;
+export {};

tests/baselines/reference/declarationEmitBindingPatternWithReservedWord.symbols

@@ -0,0 +1,78 @@
+=== tests/cases/compiler/declarationEmitBindingPatternWithReservedWord.ts ===
+type LocaleData = Record<string, never>
+>LocaleData : Symbol(LocaleData, Decl(declarationEmitBindingPatternWithReservedWord.ts, 0, 0))
+>Record : Symbol(Record, Decl(lib.es5.d.ts, --, --))
+
+type ConvertLocaleConfig<T extends LocaleData = LocaleData> = Record<
+>ConvertLocaleConfig : Symbol(ConvertLocaleConfig, Decl(declarationEmitBindingPatternWithReservedWord.ts, 0, 39))
+>T : Symbol(T, Decl(declarationEmitBindingPatternWithReservedWord.ts, 1, 25))
+>LocaleData : Symbol(LocaleData, Decl(declarationEmitBindingPatternWithReservedWord.ts, 0, 0))
+>LocaleData : Symbol(LocaleData, Decl(declarationEmitBindingPatternWithReservedWord.ts, 0, 0))
+>Record : Symbol(Record, Decl(lib.es5.d.ts, --, --))
+
+  string,
+  T
+>T : Symbol(T, Decl(declarationEmitBindingPatternWithReservedWord.ts, 1, 25))
+
+>;
+type LocaleConfig<T extends LocaleData = LocaleData> = Record<string, Partial<T>>;
+>LocaleConfig : Symbol(LocaleConfig, Decl(declarationEmitBindingPatternWithReservedWord.ts, 4, 2))
+>T : Symbol(T, Decl(declarationEmitBindingPatternWithReservedWord.ts, 5, 18))
+>LocaleData : Symbol(LocaleData, Decl(declarationEmitBindingPatternWithReservedWord.ts, 0, 0))
+>LocaleData : Symbol(LocaleData, Decl(declarationEmitBindingPatternWithReservedWord.ts, 0, 0))
+>Record : Symbol(Record, Decl(lib.es5.d.ts, --, --))
+>Partial : Symbol(Partial, Decl(lib.es5.d.ts, --, --))
+>T : Symbol(T, Decl(declarationEmitBindingPatternWithReservedWord.ts, 5, 18))
+
+export interface GetLocalesOptions<T extends LocaleData> {
+>GetLocalesOptions : Symbol(GetLocalesOptions, Decl(declarationEmitBindingPatternWithReservedWord.ts, 5, 82))
+>T : Symbol(T, Decl(declarationEmitBindingPatternWithReservedWord.ts, 7, 35))
+>LocaleData : Symbol(LocaleData, Decl(declarationEmitBindingPatternWithReservedWord.ts, 0, 0))
+
+    app: unknown;
+>app : Symbol(GetLocalesOptions.app, Decl(declarationEmitBindingPatternWithReservedWord.ts, 7, 58))
+
+    default: ConvertLocaleConfig<T>;
+>default : Symbol(GetLocalesOptions.default, Decl(declarationEmitBindingPatternWithReservedWord.ts, 8, 17))
+>ConvertLocaleConfig : Symbol(ConvertLocaleConfig, Decl(declarationEmitBindingPatternWithReservedWord.ts, 0, 39))
+>T : Symbol(T, Decl(declarationEmitBindingPatternWithReservedWord.ts, 7, 35))
+
+    config?: LocaleConfig<T> | undefined;
+>config : Symbol(GetLocalesOptions.config, Decl(declarationEmitBindingPatternWithReservedWord.ts, 9, 36))
+>LocaleConfig : Symbol(LocaleConfig, Decl(declarationEmitBindingPatternWithReservedWord.ts, 4, 2))
+>T : Symbol(T, Decl(declarationEmitBindingPatternWithReservedWord.ts, 7, 35))
+
+    name?: string;
+>name : Symbol(GetLocalesOptions.name, Decl(declarationEmitBindingPatternWithReservedWord.ts, 10, 41))
+}
+
+export const getLocales = <T extends LocaleData>({
+>getLocales : Symbol(getLocales, Decl(declarationEmitBindingPatternWithReservedWord.ts, 14, 12))
+>T : Symbol(T, Decl(declarationEmitBindingPatternWithReservedWord.ts, 14, 27))
+>LocaleData : Symbol(LocaleData, Decl(declarationEmitBindingPatternWithReservedWord.ts, 0, 0))
+
+    app,
+>app : Symbol(app, Decl(declarationEmitBindingPatternWithReservedWord.ts, 14, 50))
+
+    name,
+>name : Symbol(name, Decl(declarationEmitBindingPatternWithReservedWord.ts, 15, 8))
+
+    default: defaultLocalesConfig,
+>default : Symbol(GetLocalesOptions.default, Decl(declarationEmitBindingPatternWithReservedWord.ts, 8, 17))
+>defaultLocalesConfig : Symbol(defaultLocalesConfig, Decl(declarationEmitBindingPatternWithReservedWord.ts, 16, 9))
+
+    config: userLocalesConfig = {},
+>config : Symbol(GetLocalesOptions.config, Decl(declarationEmitBindingPatternWithReservedWord.ts, 9, 36))
+>userLocalesConfig : Symbol(userLocalesConfig, Decl(declarationEmitBindingPatternWithReservedWord.ts, 17, 34))
+
+}: GetLocalesOptions<T>): ConvertLocaleConfig<T> => {
+>GetLocalesOptions : Symbol(GetLocalesOptions, Decl(declarationEmitBindingPatternWithReservedWord.ts, 5, 82))
+>T : Symbol(T, Decl(declarationEmitBindingPatternWithReservedWord.ts, 14, 27))
+>ConvertLocaleConfig : Symbol(ConvertLocaleConfig, Decl(declarationEmitBindingPatternWithReservedWord.ts, 0, 39))
+>T : Symbol(T, Decl(declarationEmitBindingPatternWithReservedWord.ts, 14, 27))
+
+    return defaultLocalesConfig;
+>defaultLocalesConfig : Symbol(defaultLocalesConfig, Decl(declarationEmitBindingPatternWithReservedWord.ts, 16, 9))
+
+};
+

tests/baselines/reference/declarationEmitBindingPatternWithReservedWord.types

@@ -0,0 +1,52 @@
+=== tests/cases/compiler/declarationEmitBindingPatternWithReservedWord.ts ===
+type LocaleData = Record<string, never>
+>LocaleData : { [x: string]: never; }
+
+type ConvertLocaleConfig<T extends LocaleData = LocaleData> = Record<
+>ConvertLocaleConfig : ConvertLocaleConfig<T>
+
+  string,
+  T
+>;
+type LocaleConfig<T extends LocaleData = LocaleData> = Record<string, Partial<T>>;
+>LocaleConfig : LocaleConfig<T>
+
+export interface GetLocalesOptions<T extends LocaleData> {
+    app: unknown;
+>app : unknown
+
+    default: ConvertLocaleConfig<T>;
+>default : ConvertLocaleConfig<T>
+
+    config?: LocaleConfig<T> | undefined;
+>config : LocaleConfig<T>
+
+    name?: string;
+>name : string
+}
+
+export const getLocales = <T extends LocaleData>({
+>getLocales : <T extends LocaleData>({ app, name, default: defaultLocalesConfig, config: userLocalesConfig, }: GetLocalesOptions<T>) => ConvertLocaleConfig<T>
+><T extends LocaleData>({    app,    name,    default: defaultLocalesConfig,    config: userLocalesConfig = {},}: GetLocalesOptions<T>): ConvertLocaleConfig<T> => {    return defaultLocalesConfig;} : <T extends LocaleData>({ app, name, default: defaultLocalesConfig, config: userLocalesConfig, }: GetLocalesOptions<T>) => ConvertLocaleConfig<T>
+
+    app,
+>app : unknown
+
+    name,
+>name : string
+
+    default: defaultLocalesConfig,
+>default : any
+>defaultLocalesConfig : ConvertLocaleConfig<T>
+
+    config: userLocalesConfig = {},
+>config : any
+>userLocalesConfig : LocaleConfig<T>
+>{} : {}
+
+}: GetLocalesOptions<T>): ConvertLocaleConfig<T> => {
+    return defaultLocalesConfig;
+>defaultLocalesConfig : ConvertLocaleConfig<T>
+
+};
+

tests/baselines/reference/declarationEmitBindingPatterns.js

@@ -18,7 +18,7 @@ function f(_a, _b, _c) {
 
 
 //// [declarationEmitBindingPatterns.d.ts]
-declare const k: ({ x }: {
+declare const k: ({ x: z }: {
     x?: string;
 }) => void;
 declare var a: any;

tests/baselines/reference/declarationEmitBindingPatterns.types

@@ -1,7 +1,7 @@
 === tests/cases/compiler/declarationEmitBindingPatterns.ts ===
 const k = ({x: z = 'y'}) => { }
->k : ({ x }: { x?: string; }) => void
->({x: z = 'y'}) => { } : ({ x }: { x?: string; }) => void
+>k : ({ x: z }: { x?: string; }) => void
+>({x: z = 'y'}) => { } : ({ x: z }: { x?: string; }) => void
 >x : any
 >z : string
 >'y' : "y"

tests/baselines/reference/declarationEmitDuplicateParameterDestructuring.js

@@ -0,0 +1,17 @@
+//// [declarationEmitDuplicateParameterDestructuring.ts]
+export const fn1 = ({ prop: a, prop: b }: { prop: number }) => a + b;
+
+export const fn2 = ({ prop: a }: { prop: number }, { prop: b }: { prop: number }) => a + b;
+
+
+
+
+//// [declarationEmitDuplicateParameterDestructuring.d.ts]
+export declare const fn1: ({ prop: a, prop: b }: {
+    prop: number;
+}) => number;
+export declare const fn2: ({ prop: a }: {
+    prop: number;
+}, { prop: b }: {
+    prop: number;
+}) => number;

tests/baselines/reference/declarationEmitDuplicateParameterDestructuring.symbols

@@ -0,0 +1,22 @@
+=== tests/cases/compiler/declarationEmitDuplicateParameterDestructuring.ts ===
+export const fn1 = ({ prop: a, prop: b }: { prop: number }) => a + b;
+>fn1 : Symbol(fn1, Decl(declarationEmitDuplicateParameterDestructuring.ts, 0, 12))
+>prop : Symbol(prop, Decl(declarationEmitDuplicateParameterDestructuring.ts, 0, 43))
+>a : Symbol(a, Decl(declarationEmitDuplicateParameterDestructuring.ts, 0, 21))
+>prop : Symbol(prop, Decl(declarationEmitDuplicateParameterDestructuring.ts, 0, 43))
+>b : Symbol(b, Decl(declarationEmitDuplicateParameterDestructuring.ts, 0, 30))
+>prop : Symbol(prop, Decl(declarationEmitDuplicateParameterDestructuring.ts, 0, 43))
+>a : Symbol(a, Decl(declarationEmitDuplicateParameterDestructuring.ts, 0, 21))
+>b : Symbol(b, Decl(declarationEmitDuplicateParameterDestructuring.ts, 0, 30))
+
+export const fn2 = ({ prop: a }: { prop: number }, { prop: b }: { prop: number }) => a + b;
+>fn2 : Symbol(fn2, Decl(declarationEmitDuplicateParameterDestructuring.ts, 2, 12))
+>prop : Symbol(prop, Decl(declarationEmitDuplicateParameterDestructuring.ts, 2, 34))
+>a : Symbol(a, Decl(declarationEmitDuplicateParameterDestructuring.ts, 2, 21))
+>prop : Symbol(prop, Decl(declarationEmitDuplicateParameterDestructuring.ts, 2, 34))
+>prop : Symbol(prop, Decl(declarationEmitDuplicateParameterDestructuring.ts, 2, 65))
+>b : Symbol(b, Decl(declarationEmitDuplicateParameterDestructuring.ts, 2, 52))
+>prop : Symbol(prop, Decl(declarationEmitDuplicateParameterDestructuring.ts, 2, 65))
+>a : Symbol(a, Decl(declarationEmitDuplicateParameterDestructuring.ts, 2, 21))
+>b : Symbol(b, Decl(declarationEmitDuplicateParameterDestructuring.ts, 2, 52))
+

tests/baselines/reference/declarationEmitDuplicateParameterDestructuring.types

@@ -0,0 +1,26 @@
+=== tests/cases/compiler/declarationEmitDuplicateParameterDestructuring.ts ===
+export const fn1 = ({ prop: a, prop: b }: { prop: number }) => a + b;
+>fn1 : ({ prop: a, prop: b }: {    prop: number;}) => number
+>({ prop: a, prop: b }: { prop: number }) => a + b : ({ prop: a, prop: b }: {    prop: number;}) => number
+>prop : any
+>a : number
+>prop : any
+>b : number
+>prop : number
+>a + b : number
+>a : number
+>b : number
+
+export const fn2 = ({ prop: a }: { prop: number }, { prop: b }: { prop: number }) => a + b;
+>fn2 : ({ prop: a }: {    prop: number;}, { prop: b }: {    prop: number;}) => number
+>({ prop: a }: { prop: number }, { prop: b }: { prop: number }) => a + b : ({ prop: a }: {    prop: number;}, { prop: b }: {    prop: number;}) => number
+>prop : any
+>a : number
+>prop : number
+>prop : any
+>b : number
+>prop : number
+>a + b : number
+>a : number
+>b : number
+

tests/baselines/reference/declarationsAndAssignments.types

@@ -417,7 +417,7 @@ function f13() {
 }
 
 function f14([a = 1, [b = "hello", { x, y: c = false }]]) {
->f14 : ([a, [b, { x, y }]]: [number, [string, { x: any; y?: boolean; }]]) => void
+>f14 : ([a, [b, { x, y: c }]]: [number, [string, { x: any; y?: boolean; }]]) => void
 >a : number
 >1 : 1
 >b : string
@@ -438,7 +438,7 @@ function f14([a = 1, [b = "hello", { x, y: c = false }]]) {
 }
 f14([2, ["abc", { x: 0, y: true }]]);
 >f14([2, ["abc", { x: 0, y: true }]]) : void
->f14 : ([a, [b, { x, y }]]: [number, [string, { x: any; y?: boolean; }]]) => void
+>f14 : ([a, [b, { x, y: c }]]: [number, [string, { x: any; y?: boolean; }]]) => void
 >[2, ["abc", { x: 0, y: true }]] : [number, [string, { x: number; y: true; }]]
 >2 : 2
 >["abc", { x: 0, y: true }] : [string, { x: number; y: true; }]
@@ -451,7 +451,7 @@ f14([2, ["abc", { x: 0, y: true }]]);
 
 f14([2, ["abc", { x: 0 }]]);
 >f14([2, ["abc", { x: 0 }]]) : void
->f14 : ([a, [b, { x, y }]]: [number, [string, { x: any; y?: boolean; }]]) => void
+>f14 : ([a, [b, { x, y: c }]]: [number, [string, { x: any; y?: boolean; }]]) => void
 >[2, ["abc", { x: 0 }]] : [number, [string, { x: number; }]]
 >2 : 2
 >["abc", { x: 0 }] : [string, { x: number; }]
@@ -462,7 +462,7 @@ f14([2, ["abc", { x: 0 }]]);
 
 f14([2, ["abc", { y: false }]]);  // Error, no x
 >f14([2, ["abc", { y: false }]]) : void
->f14 : ([a, [b, { x, y }]]: [number, [string, { x: any; y?: boolean; }]]) => void
+>f14 : ([a, [b, { x, y: c }]]: [number, [string, { x: any; y?: boolean; }]]) => void
 >[2, ["abc", { y: false }]] : [number, [string, { y: false; }]]
 >2 : 2
 >["abc", { y: false }] : [string, { y: false; }]

tests/baselines/reference/destructuringInFunctionType.types

@@ -31,7 +31,7 @@ type T3 = ([{ a: b }, { b: a }]);
 >b : a
 
 type F3 = ([{ a: b }, { b: a }]) => void;
->F3 : ([{ a }, { b }]: [{ a: any; }, { b: any; }]) => void
+>F3 : ([{ a: b }, { b: a }]: [{ a: any; }, { b: any; }]) => void
 >a : any
 >b : any
 >b : any

tests/baselines/reference/destructuringParameterDeclaration1ES5.types

@@ -402,7 +402,7 @@ d5();  // Parameter is optional as its declaration included an initializer
 // Type annotations must instead be written on the top- level parameter declaration
 
 function e1({x: number}) { }  // x has type any NOT number
->e1 : ({ x }: { x: any; }) => void
+>e1 : ({ x: number }: { x: any; }) => void
 >x : any
 >number : any
 

tests/baselines/reference/destructuringParameterDeclaration1ES5iterable.types

@@ -402,7 +402,7 @@ d5();  // Parameter is optional as its declaration included an initializer
 // Type annotations must instead be written on the top- level parameter declaration
 
 function e1({x: number}) { }  // x has type any NOT number
->e1 : ({ x }: { x: any; }) => void
+>e1 : ({ x: number }: { x: any; }) => void
 >x : any
 >number : any
 

tests/baselines/reference/destructuringParameterDeclaration1ES6.types

@@ -376,7 +376,7 @@ d5();  // Parameter is optional as its declaration included an initializer
 // Type annotations must instead be written on the top- level parameter declaration
 
 function e1({x: number}) { }  // x has type any NOT number
->e1 : ({ x }: { x: any; }) => void
+>e1 : ({ x: number }: { x: any; }) => void
 >x : any
 >number : any