Cherry-pick PR #40118 into release-4.0 (#40134)

Component commits:
e1f4f9c Fix tuple name homogeneity check

Co-authored-by: Wesley Wigham <t-weswig@microsoft.com>

src/compiler/checker.ts

@@ -31041,13 +31041,10 @@ namespace ts {
         function checkTupleType(node: TupleTypeNode) {
             const elementTypes = node.elements;
             let seenOptionalElement = false;
-            let seenNamedElement = false;
+            const hasNamedElement = some(elementTypes, isNamedTupleMember);
             for (let i = 0; i < elementTypes.length; i++) {
                 const e = elementTypes[i];
-                if (e.kind === SyntaxKind.NamedTupleMember) {
-                    seenNamedElement = true;
-                }
-                else if (seenNamedElement) {
+                if (e.kind !== SyntaxKind.NamedTupleMember && hasNamedElement) {
                     grammarErrorOnNode(e, Diagnostics.Tuple_members_must_all_have_names_or_all_not_have_names);
                     break;
                 }

tests/baselines/reference/namedTupleMembersErrors.errors.txt

@@ -1,28 +1,40 @@
 tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(1,41): error TS5084: Tuple members must all have names or all not have names.
-tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(3,32): error TS5084: Tuple members must all have names or all not have names.
-tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(5,32): error TS5084: Tuple members must all have names or all not have names.
-tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(7,29): error TS5086: A labeled tuple element is declared as optional with a question mark after the name and before the colon, rather than after the type.
-tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(9,46): error TS5087: A labeled tuple element is declared as rest with a `...` before the name, rather than before the type.
-tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(11,49): error TS5087: A labeled tuple element is declared as rest with a `...` before the name, rather than before the type.
-tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(11,52): error TS8020: JSDoc types can only be used inside documentation comments.
-tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(13,39): error TS5085: A tuple member cannot be both optional and rest.
-tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(15,44): error TS2574: A rest element type must be an array type.
-tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(17,13): error TS2456: Type alias 'RecusiveRestUnlabeled' circularly references itself.
-tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(18,13): error TS2456: Type alias 'RecusiveRest' circularly references itself.
+tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(2,25): error TS5084: Tuple members must all have names or all not have names.
+tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(4,32): error TS5084: Tuple members must all have names or all not have names.
+tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(5,22): error TS5084: Tuple members must all have names or all not have names.
+tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(7,32): error TS5084: Tuple members must all have names or all not have names.
+tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(8,22): error TS5084: Tuple members must all have names or all not have names.
+tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(10,29): error TS5086: A labeled tuple element is declared as optional with a question mark after the name and before the colon, rather than after the type.
+tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(12,46): error TS5087: A labeled tuple element is declared as rest with a `...` before the name, rather than before the type.
+tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(14,49): error TS5087: A labeled tuple element is declared as rest with a `...` before the name, rather than before the type.
+tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(14,52): error TS8020: JSDoc types can only be used inside documentation comments.
+tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(16,39): error TS5085: A tuple member cannot be both optional and rest.
+tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(18,44): error TS2574: A rest element type must be an array type.
+tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(20,13): error TS2456: Type alias 'RecusiveRestUnlabeled' circularly references itself.
+tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts(21,13): error TS2456: Type alias 'RecusiveRest' circularly references itself.
 
 
-==== tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts (11 errors) ====
+==== tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts (14 errors) ====
     export type Segment1 = [length: number, number]; // partially named, disallowed
                                             ~~~~~~
 !!! error TS5084: Tuple members must all have names or all not have names.
+    export type Segment2 = [number, size: number]; // partially named, disallowed
+                            ~~~~~~
+!!! error TS5084: Tuple members must all have names or all not have names.
 
     export type List = [item: any, ...any];  // partially named, disallowed
                                    ~~~~~~
 !!! error TS5084: Tuple members must all have names or all not have names.
+    export type List2 = [any, ...remainder: any];  // partially named, disallowed
+                         ~~~
+!!! error TS5084: Tuple members must all have names or all not have names.
 
     export type Pair = [item: any, any?];  // partially named, disallowed
                                    ~~~~
 !!! error TS5084: Tuple members must all have names or all not have names.
+    export type Pair2 = [any, last?: any];  // partially named, disallowed
+                         ~~~
+!!! error TS5084: Tuple members must all have names or all not have names.
 
     export type Opt = [element: string?]; // question mark on element disallowed
                                 ~~~~~~~

tests/baselines/reference/namedTupleMembersErrors.js

@@ -1,9 +1,12 @@
 //// [namedTupleMembersErrors.ts]
 export type Segment1 = [length: number, number]; // partially named, disallowed
+export type Segment2 = [number, size: number]; // partially named, disallowed
 
 export type List = [item: any, ...any];  // partially named, disallowed
+export type List2 = [any, ...remainder: any];  // partially named, disallowed
 
 export type Pair = [item: any, any?];  // partially named, disallowed
+export type Pair2 = [any, last?: any];  // partially named, disallowed
 
 export type Opt = [element: string?]; // question mark on element disallowed
 
@@ -26,8 +29,11 @@ exports.__esModule = true;
 
 //// [namedTupleMembersErrors.d.ts]
 export declare type Segment1 = [length: number, number];
+export declare type Segment2 = [number, size: number];
 export declare type List = [item: any, ...any];
+export declare type List2 = [any, ...remainder: any];
 export declare type Pair = [item: any, any?];
+export declare type Pair2 = [any, last?: any];
 export declare type Opt = [element: string?];
 export declare type Trailing = [first: string, rest: ...string[]];
 export declare type OptTrailing = [first: string, rest: ...?string[]];

tests/baselines/reference/namedTupleMembersErrors.symbols

@@ -2,32 +2,41 @@
 export type Segment1 = [length: number, number]; // partially named, disallowed
 >Segment1 : Symbol(Segment1, Decl(namedTupleMembersErrors.ts, 0, 0))
 
+export type Segment2 = [number, size: number]; // partially named, disallowed
+>Segment2 : Symbol(Segment2, Decl(namedTupleMembersErrors.ts, 0, 48))
+
 export type List = [item: any, ...any];  // partially named, disallowed
->List : Symbol(List, Decl(namedTupleMembersErrors.ts, 0, 48))
+>List : Symbol(List, Decl(namedTupleMembersErrors.ts, 1, 46))
+
+export type List2 = [any, ...remainder: any];  // partially named, disallowed
+>List2 : Symbol(List2, Decl(namedTupleMembersErrors.ts, 3, 39))
 
 export type Pair = [item: any, any?];  // partially named, disallowed
->Pair : Symbol(Pair, Decl(namedTupleMembersErrors.ts, 2, 39))
+>Pair : Symbol(Pair, Decl(namedTupleMembersErrors.ts, 4, 45))
+
+export type Pair2 = [any, last?: any];  // partially named, disallowed
+>Pair2 : Symbol(Pair2, Decl(namedTupleMembersErrors.ts, 6, 37))
 
 export type Opt = [element: string?]; // question mark on element disallowed
->Opt : Symbol(Opt, Decl(namedTupleMembersErrors.ts, 4, 37))
+>Opt : Symbol(Opt, Decl(namedTupleMembersErrors.ts, 7, 38))
 
 export type Trailing = [first: string, rest: ...string[]]; // dots on element disallowed
->Trailing : Symbol(Trailing, Decl(namedTupleMembersErrors.ts, 6, 37))
+>Trailing : Symbol(Trailing, Decl(namedTupleMembersErrors.ts, 9, 37))
 
 export type OptTrailing = [first: string, rest: ...string[]?]; // dots+question on element disallowed
->OptTrailing : Symbol(OptTrailing, Decl(namedTupleMembersErrors.ts, 8, 58))
+>OptTrailing : Symbol(OptTrailing, Decl(namedTupleMembersErrors.ts, 11, 58))
 
 export type OptRest = [first: string, ...rest?: string[]]; // rest+optional disallowed
->OptRest : Symbol(OptRest, Decl(namedTupleMembersErrors.ts, 10, 62))
+>OptRest : Symbol(OptRest, Decl(namedTupleMembersErrors.ts, 13, 62))
 
 export type NonArrayRest = [first: string, ...rest: number]; // non-arraylike rest, disallowed
->NonArrayRest : Symbol(NonArrayRest, Decl(namedTupleMembersErrors.ts, 12, 58))
+>NonArrayRest : Symbol(NonArrayRest, Decl(namedTupleMembersErrors.ts, 15, 58))
 
 export type RecusiveRestUnlabeled = [string, ...RecusiveRestUnlabeled];
->RecusiveRestUnlabeled : Symbol(RecusiveRestUnlabeled, Decl(namedTupleMembersErrors.ts, 14, 60))
->RecusiveRestUnlabeled : Symbol(RecusiveRestUnlabeled, Decl(namedTupleMembersErrors.ts, 14, 60))
+>RecusiveRestUnlabeled : Symbol(RecusiveRestUnlabeled, Decl(namedTupleMembersErrors.ts, 17, 60))
+>RecusiveRestUnlabeled : Symbol(RecusiveRestUnlabeled, Decl(namedTupleMembersErrors.ts, 17, 60))
 
 export type RecusiveRest = [first: string, ...rest: RecusiveRest]; // marked as incorrect, same as above
->RecusiveRest : Symbol(RecusiveRest, Decl(namedTupleMembersErrors.ts, 16, 71))
->RecusiveRest : Symbol(RecusiveRest, Decl(namedTupleMembersErrors.ts, 16, 71))
+>RecusiveRest : Symbol(RecusiveRest, Decl(namedTupleMembersErrors.ts, 19, 71))
+>RecusiveRest : Symbol(RecusiveRest, Decl(namedTupleMembersErrors.ts, 19, 71))
 

tests/baselines/reference/namedTupleMembersErrors.types

@@ -2,12 +2,21 @@
 export type Segment1 = [length: number, number]; // partially named, disallowed
 >Segment1 : Segment1
 
+export type Segment2 = [number, size: number]; // partially named, disallowed
+>Segment2 : Segment2
+
 export type List = [item: any, ...any];  // partially named, disallowed
 >List : [any, ...any[]]
 
+export type List2 = [any, ...remainder: any];  // partially named, disallowed
+>List2 : [any, ...any[]]
+
 export type Pair = [item: any, any?];  // partially named, disallowed
 >Pair : Pair
 
+export type Pair2 = [any, last?: any];  // partially named, disallowed
+>Pair2 : Pair2
+
 export type Opt = [element: string?]; // question mark on element disallowed
 >Opt : Opt
 

tests/cases/conformance/types/tuple/named/namedTupleMembersErrors.ts

@@ -1,10 +1,13 @@
 // @declaration: true
 
 export type Segment1 = [length: number, number]; // partially named, disallowed
+export type Segment2 = [number, size: number]; // partially named, disallowed
 
 export type List = [item: any, ...any];  // partially named, disallowed
+export type List2 = [any, ...remainder: any];  // partially named, disallowed
 
 export type Pair = [item: any, any?];  // partially named, disallowed
+export type Pair2 = [any, last?: any];  // partially named, disallowed
 
 export type Opt = [element: string?]; // question mark on element disallowed