Detect cycles while serializing array and tuple types

tsc/internal/checker/nodebuilderimpl.go

@@ -41,9 +41,10 @@ type SerializedTypeEntry struct {
 }
 
 type CompositeTypeCacheIdentity struct {
-	typeId        TypeId
-	flags         nodebuilder.Flags
-	internalFlags nodebuilder.InternalFlags
+	typeId              TypeId
+	flags               nodebuilder.Flags
+	internalFlags       nodebuilder.InternalFlags
+	inferTypeParameters CacheHashKey
 }
 
 type NodeBuilderLinks struct {
@@ -3084,7 +3085,7 @@ func (b *NodeBuilderImpl) getParentSymbolOfTypeParameter(typeParameter *TypePara
 	return b.ch.getSymbolOfNode(host)
 }
 
-func (b *NodeBuilderImpl) typeReferenceToTypeNode(t *Type) *ast.TypeNode {
+func (b *NodeBuilderImpl) arrayOrTupleTypeToNode(t *Type) *ast.TypeNode {
 	var typeArguments []*Type = b.ch.getTypeArguments(t)
 	if t.Target() == b.ch.globalArrayType || t.Target() == b.ch.globalReadonlyArrayType {
 		if b.ctx.flags&nodebuilder.FlagsWriteArrayAsGenericType != 0 {
@@ -3101,7 +3102,8 @@ func (b *NodeBuilderImpl) typeReferenceToTypeNode(t *Type) *ast.TypeNode {
 		} else {
 			return b.f.NewTypeOperatorNode(ast.KindReadonlyKeyword, arrayType)
 		}
-	} else if t.Target().objectFlags&ObjectFlagsTuple != 0 {
+	} else {
+		debug.Assert(t.Target().objectFlags&ObjectFlagsTuple != 0)
 		typeArguments = core.SameMapIndex(typeArguments, func(arg *Type, i int) *Type {
 			isOptional := false
 			if i < len(t.Target().AsTupleType().elementInfos) {
@@ -3154,7 +3156,12 @@ func (b *NodeBuilderImpl) typeReferenceToTypeNode(t *Type) *ast.TypeNode {
 		b.ctx.encounteredError = true
 		return nil
 		// TODO: GH#18217
-	} else if b.ctx.flags&nodebuilder.FlagsWriteClassExpressionAsTypeLiteral != 0 && t.symbol.ValueDeclaration != nil && ast.IsClassLike(t.symbol.ValueDeclaration) && !b.ch.IsValueSymbolAccessible(t.symbol, b.ctx.enclosingDeclaration) {
+	}
+}
+
+func (b *NodeBuilderImpl) typeReferenceToTypeNode(t *Type) *ast.TypeNode {
+	var typeArguments []*Type = b.ch.getTypeArguments(t)
+	if b.ctx.flags&nodebuilder.FlagsWriteClassExpressionAsTypeLiteral != 0 && t.symbol.ValueDeclaration != nil && ast.IsClassLike(t.symbol.ValueDeclaration) && !b.ch.IsValueSymbolAccessible(t.symbol, b.ctx.enclosingDeclaration) {
 		return b.createAnonymousTypeNode(t)
 	} else {
 		outerTypeParameters := t.Target().AsInterfaceType().OuterTypeParameters()
@@ -3232,9 +3239,21 @@ func (b *NodeBuilderImpl) visitAndTransformType(t *Type, transform func(b *NodeB
 	}
 
 	typeId := t.id
+	isArrayOrTuple := b.ch.isArrayOrTupleType(t)
+	if isArrayOrTuple {
+		// Deferred and regular references share a cycle identity.
+		typeId = b.ch.createTypeReference(t.Target(), b.ch.getTypeArguments(t)).id
+	}
+	if b.ctx.visitedTypes.Has(typeId) {
+		return b.createCyclicStructurePlaceholder()
+	}
+
 	isConstructorObject := t.objectFlags&ObjectFlagsAnonymous != 0 && t.symbol != nil && t.symbol.Flags&ast.SymbolFlagsClass != 0
 	var id *CompositeSymbolIdentity
 	switch {
+	case isArrayOrTuple:
+		// Do not bound finite container nesting by the shared Array symbol or tuple origin.
+		id = nil
 	case t.objectFlags&ObjectFlagsReference != 0 && t.AsTypeReference().node != nil:
 		id = &CompositeSymbolIdentity{false, 0, ast.GetNodeId(t.AsTypeReference().node)}
 	case t.flags&TypeFlagsConditional != 0:
@@ -3247,7 +3266,14 @@ func (b *NodeBuilderImpl) visitAndTransformType(t *Type, transform func(b *NodeB
 	// Since instantiations of the same anonymous type have the same symbol, tracking symbols instead
 	// of types allows us to catch circular references to instantiations of the same anonymous type
 
-	key := CompositeTypeCacheIdentity{typeId, b.ctx.flags, b.ctx.internalFlags}
+	key := CompositeTypeCacheIdentity{
+		typeId:        typeId,
+		flags:         b.ctx.flags,
+		internalFlags: b.ctx.internalFlags,
+	}
+	if len(b.ctx.inferTypeParameters) != 0 {
+		key.inferTypeParameters = getTypeListKey(b.ctx.inferTypeParameters)
+	}
 	// Don't rely on type cache if we're expanding a type, because we need to compute `canIncreaseExpansionDepth`.
 	canUseCache := b.ctx.maxExpansionDepth < 0
 	if canUseCache && b.ctx.enclosingDeclaration != nil && b.links.Has(b.ctx.enclosingDeclaration) {
@@ -3518,7 +3544,9 @@ func (b *NodeBuilderImpl) typeToTypeNode(t *Type) *ast.TypeNode {
 			b.ctx.depth--
 			return result
 		}
-		if t.AsTypeReference().node != nil {
+		if b.ch.isArrayOrTupleType(t) {
+			return b.visitAndTransformType(t, (*NodeBuilderImpl).arrayOrTupleTypeToNode)
+		} else if t.AsTypeReference().node != nil {
 			return b.visitAndTransformType(t, (*NodeBuilderImpl).typeReferenceToTypeNode)
 		} else {
 			return b.typeReferenceToTypeNode(t)

tsc/internal/execute/tsctests/tsc_test.go

@@ -2432,6 +2432,58 @@ func TestTscIncremental(t *testing.T) {
 				noChange,
 			},
 		},
+		{
+			subScenario: "recursive tagged tuple after incremental edits",
+			files: FileMap{
+				"/home/src/workspaces/project/tsconfig.json": `{"compilerOptions": {"strict": true, "incremental": true, "noEmit": true, "module": "esnext", "moduleResolution": "bundler"}}`,
+				tscLibPath + "/lib.es2026.full.d.ts":         libWithReadonlyArray,
+				"/home/src/workspaces/project/doc.ts": stringtestutil.Dedent(`
+					type Doc =
+						| string
+						| { [k: string]: Doc }
+						| readonly ["array", Doc]
+						| readonly ["array", Doc, { length: number }]
+						| readonly ["array", Doc, { min?: number; max?: number }]
+						| readonly ["union", Doc, ...Doc[]];
+					export declare const doc: Doc;
+				`),
+				"/home/src/workspaces/project/consumer.ts": stringtestutil.Dedent(`
+					import { doc } from "./doc";
+					export const value = doc;
+				`),
+			},
+			edits: []*tscEdit{
+				noChange,
+				{
+					caption: "add a comment to the recursive type",
+					edit: func(sys *TestSys) {
+						sys.appendFile("/home/src/workspaces/project/doc.ts", "\n// comment-only edit\n")
+					},
+				},
+				noChange,
+				{
+					caption: "add a union constituent",
+					edit: func(sys *TestSys) {
+						sys.replaceFileText("/home/src/workspaces/project/doc.ts", "| string", "| number\n    | string")
+					},
+				},
+				noChange,
+				{
+					caption: "verify the consumer type was not weakened",
+					edit: func(sys *TestSys) {
+						sys.appendFile("/home/src/workspaces/project/consumer.ts", "\nexport const invalid: number = value;\n")
+					},
+				},
+				noChange,
+				{
+					caption: "delete build info and check the edited source afresh",
+					edit: func(sys *TestSys) {
+						sys.removeNoError("/home/src/workspaces/project/tsconfig.tsbuildinfo")
+					},
+				},
+				noChange,
+			},
+		},
 		{
 			subScenario: "json module diagnostics are cleared after fixing the json file",
 			files: FileMap{

tsc/internal/fourslash/tests/quickInfoCanBeTruncated_test.go

@@ -536,5 +536,5 @@ type DeeplyMapped/*6*/ = {[K in keyof Foo]: {[K2 in keyof Foo]: [K, K2, Foo[K],
 	f.GoToMarker(t, "5")
 	f.VerifyQuickInfoIs(t, "type LongTuple = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17.18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70]", "")
 	f.GoToMarker(t, "6")
-	f.VerifyQuickInfoIs(t, "type DeeplyMapped = {\n    _0: {\n        _0: [\"_0\", \"_0\", 0, 0];\n        _1: [\"_0\", \"_1\", 0, 1];\n        _2: [\"_0\", \"_2\", 0, 2];\n        _3: [\"_0\", \"_3\", 0, 3];\n        _4: [\"_0\", \"_4\", 0, 4];\n        _5: [\"_0\", \"_5\", 0, 5];\n        _6: [\"_0\", \"_6\", 0, 6];\n        _7: [\"_0\", \"_7\", 0, 7];\n        _8: [\"_0\", \"_8\", 0, 8];\n        _9: [\"_0\", \"_9\", 0, 9];\n        _10: [\"_0\", \"_10\", 0, 10];\n        _11: [\"_0\", \"_11\", 0, 11];\n        _12: [\"_0\", \"_12\", 0, 12];\n        _13: [\"_0\", \"_13\", 0, 13];\n        _14: [\"_0\", \"_14\", 0, 14];\n        _15: [\"_0\", \"_15\", 0, 15];\n        _16: [\"_0\", \"_16\", 0, 16];\n        _17: [\"_0\", \"_17\", 0, 17];\n        _18: [\"_0\", \"_18\", 0, 18];\n        _19: [\"_0\", \"_19\", 0, 19];\n        _20: [\"_0\", \"_20\", 0, 20];\n        _21: [\"_0\", \"_21\", 0, 21];\n        ... 477 more ...;\n        _499: [...];\n    };\n    ... 498 more ...;\n    _499: ...;\n}", "")
+	f.VerifyQuickInfoIs(t, "type DeeplyMapped = {\n    _0: {\n        _0: [\"_0\", \"_0\", 0, 0];\n        _1: [\"_0\", \"_1\", 0, 1];\n        _2: [\"_0\", \"_2\", 0, 2];\n        _3: [\"_0\", \"_3\", 0, 3];\n        _4: [\"_0\", \"_4\", 0, 4];\n        _5: [\"_0\", \"_5\", 0, 5];\n        _6: [\"_0\", \"_6\", 0, 6];\n        _7: [\"_0\", \"_7\", 0, 7];\n        _8: [\"_0\", \"_8\", 0, 8];\n        _9: [\"_0\", \"_9\", 0, 9];\n        _10: [\"_0\", \"_10\", 0, 10];\n        _11: [\"_0\", \"_11\", 0, 11];\n        _12: [\"_0\", \"_12\", 0, 12];\n        _13: [\"_0\", \"_13\", 0, 13];\n        _14: [\"_0\", \"_14\", 0, 14];\n        _15: [\"_0\", \"_15\", 0, 15];\n        _16: [\"_0\", \"_16\", 0, 16];\n        _17: [\"_0\", \"_17\", 0, 17];\n        _18: [\"_0\", \"_18\", 0, 18];\n        _19: [\"_0\", \"_19\", 0, 19];\n        _20: [\"_0\", \"_20\", 0, 20];\n        _21: [\"_0\", \"_21\", 0, 21];\n        ... 477 more ...;\n        _499: ...;\n    };\n    ... 498 more ...;\n    _499: ...;\n}", "")
 }

tsc/testdata/baselines/reference/compiler/recursiveContainerDeclarationSerialization.errors.txt

@@ -0,0 +1,48 @@
+local.ts(1,17): error TS5088: The inferred type of 'array' references a type with a cyclic structure which cannot be trivially serialized. A type annotation is necessary.
+local.ts(5,17): error TS5088: The inferred type of 'tuple' references a type with a cyclic structure which cannot be trivially serialized. A type annotation is necessary.
+local.ts(9,17): error TS5088: The inferred type of 'readonlyTuple' references a type with a cyclic structure which cannot be trivially serialized. A type annotation is necessary.
+local.ts(13,17): error TS5088: The inferred type of 'union' references a type with a cyclic structure which cannot be trivially serialized. A type annotation is necessary.
+
+
+==== local.ts (4 errors) ====
+    export function array() {
+                    ~~~~~
+!!! error TS5088: The inferred type of 'array' references a type with a cyclic structure which cannot be trivially serialized. A type annotation is necessary.
+        type Recursive = Recursive[];
+        return null as unknown as Recursive;
+    }
+    export function tuple() {
+                    ~~~~~
+!!! error TS5088: The inferred type of 'tuple' references a type with a cyclic structure which cannot be trivially serialized. A type annotation is necessary.
+        type Recursive = [Recursive];
+        return null as unknown as Recursive;
+    }
+    export function readonlyTuple() {
+                    ~~~~~~~~~~~~~
+!!! error TS5088: The inferred type of 'readonlyTuple' references a type with a cyclic structure which cannot be trivially serialized. A type annotation is necessary.
+        type Recursive = readonly [Recursive];
+        return null as unknown as Recursive;
+    }
+    export function union() {
+                    ~~~~~
+!!! error TS5088: The inferred type of 'union' references a type with a cyclic structure which cannot be trivially serialized. A type annotation is necessary.
+        type Recursive = string | Recursive[];
+        return null as unknown as Recursive;
+    }
+
+==== nameable.ts (0 errors) ====
+    export type RecursiveArray = RecursiveArray[];
+    export type RecursiveTuple = readonly [RecursiveTuple];
+    declare const array: RecursiveArray;
+    declare const tuple: RecursiveTuple;
+    export const namedArray = array;
+    export const namedTuple = tuple;
+    export function finite() {
+        type Nested = [[[[[[[[[[[[[number]]]]]]]]]]]]];
+        return null as unknown as Nested;
+    }
+    export function finiteArray() {
+        type Nested = number[][][][][][][][][][][][][];
+        return null as unknown as Nested;
+    }
+

tsc/testdata/baselines/reference/compiler/recursiveContainerDeclarationSerialization.js

@@ -0,0 +1,68 @@
+//// [tests/cases/compiler/recursiveContainerDeclarationSerialization.ts] ////
+
+//// [local.ts]
+export function array() {
+    type Recursive = Recursive[];
+    return null as unknown as Recursive;
+}
+export function tuple() {
+    type Recursive = [Recursive];
+    return null as unknown as Recursive;
+}
+export function readonlyTuple() {
+    type Recursive = readonly [Recursive];
+    return null as unknown as Recursive;
+}
+export function union() {
+    type Recursive = string | Recursive[];
+    return null as unknown as Recursive;
+}
+
+//// [nameable.ts]
+export type RecursiveArray = RecursiveArray[];
+export type RecursiveTuple = readonly [RecursiveTuple];
+declare const array: RecursiveArray;
+declare const tuple: RecursiveTuple;
+export const namedArray = array;
+export const namedTuple = tuple;
+export function finite() {
+    type Nested = [[[[[[[[[[[[[number]]]]]]]]]]]]];
+    return null as unknown as Nested;
+}
+export function finiteArray() {
+    type Nested = number[][][][][][][][][][][][][];
+    return null as unknown as Nested;
+}
+
+
+//// [local.js]
+export function array() {
+    return null;
+}
+export function tuple() {
+    return null;
+}
+export function readonlyTuple() {
+    return null;
+}
+export function union() {
+    return null;
+}
+//// [nameable.js]
+export const namedArray = array;
+export const namedTuple = tuple;
+export function finite() {
+    return null;
+}
+export function finiteArray() {
+    return null;
+}
+
+
+//// [nameable.d.ts]
+export type RecursiveArray = RecursiveArray[];
+export type RecursiveTuple = readonly [RecursiveTuple];
+export declare const namedArray: RecursiveArray;
+export declare const namedTuple: RecursiveTuple;
+export declare function finite(): [[[[[[[[[[[[[number]]]]]]]]]]]]];
+export declare function finiteArray(): number[][][][][][][][][][][][][];

tsc/testdata/baselines/reference/compiler/recursiveContainerDeclarationSerialization.symbols

@@ -0,0 +1,88 @@
+//// [tests/cases/compiler/recursiveContainerDeclarationSerialization.ts] ////
+
+=== local.ts ===
+export function array() {
+>array : Symbol(array, Decl(local.ts, 0, 0))
+
+    type Recursive = Recursive[];
+>Recursive : Symbol(Recursive, Decl(local.ts, 0, 25))
+>Recursive : Symbol(Recursive, Decl(local.ts, 0, 25))
+
+    return null as unknown as Recursive;
+>Recursive : Symbol(Recursive, Decl(local.ts, 0, 25))
+}
+export function tuple() {
+>tuple : Symbol(tuple, Decl(local.ts, 3, 1))
+
+    type Recursive = [Recursive];
+>Recursive : Symbol(Recursive, Decl(local.ts, 4, 25))
+>Recursive : Symbol(Recursive, Decl(local.ts, 4, 25))
+
+    return null as unknown as Recursive;
+>Recursive : Symbol(Recursive, Decl(local.ts, 4, 25))
+}
+export function readonlyTuple() {
+>readonlyTuple : Symbol(readonlyTuple, Decl(local.ts, 7, 1))
+
+    type Recursive = readonly [Recursive];
+>Recursive : Symbol(Recursive, Decl(local.ts, 8, 33))
+>Recursive : Symbol(Recursive, Decl(local.ts, 8, 33))
+
+    return null as unknown as Recursive;
+>Recursive : Symbol(Recursive, Decl(local.ts, 8, 33))
+}
+export function union() {
+>union : Symbol(union, Decl(local.ts, 11, 1))
+
+    type Recursive = string | Recursive[];
+>Recursive : Symbol(Recursive, Decl(local.ts, 12, 25))
+>Recursive : Symbol(Recursive, Decl(local.ts, 12, 25))
+
+    return null as unknown as Recursive;
+>Recursive : Symbol(Recursive, Decl(local.ts, 12, 25))
+}
+
+=== nameable.ts ===
+export type RecursiveArray = RecursiveArray[];
+>RecursiveArray : Symbol(RecursiveArray, Decl(nameable.ts, 0, 0))
+>RecursiveArray : Symbol(RecursiveArray, Decl(nameable.ts, 0, 0))
+
+export type RecursiveTuple = readonly [RecursiveTuple];
+>RecursiveTuple : Symbol(RecursiveTuple, Decl(nameable.ts, 0, 46))
+>RecursiveTuple : Symbol(RecursiveTuple, Decl(nameable.ts, 0, 46))
+
+declare const array: RecursiveArray;
+>array : Symbol(array, Decl(nameable.ts, 2, 13))
+>RecursiveArray : Symbol(RecursiveArray, Decl(nameable.ts, 0, 0))
+
+declare const tuple: RecursiveTuple;
+>tuple : Symbol(tuple, Decl(nameable.ts, 3, 13))
+>RecursiveTuple : Symbol(RecursiveTuple, Decl(nameable.ts, 0, 46))
+
+export const namedArray = array;
+>namedArray : Symbol(namedArray, Decl(nameable.ts, 4, 12))
+>array : Symbol(array, Decl(nameable.ts, 2, 13))
+
+export const namedTuple = tuple;
+>namedTuple : Symbol(namedTuple, Decl(nameable.ts, 5, 12))
+>tuple : Symbol(tuple, Decl(nameable.ts, 3, 13))
+
+export function finite() {
+>finite : Symbol(finite, Decl(nameable.ts, 5, 32))
+
+    type Nested = [[[[[[[[[[[[[number]]]]]]]]]]]]];
+>Nested : Symbol(Nested, Decl(nameable.ts, 6, 26))
+
+    return null as unknown as Nested;
+>Nested : Symbol(Nested, Decl(nameable.ts, 6, 26))
+}
+export function finiteArray() {
+>finiteArray : Symbol(finiteArray, Decl(nameable.ts, 9, 1))
+
+    type Nested = number[][][][][][][][][][][][][];
+>Nested : Symbol(Nested, Decl(nameable.ts, 10, 31))
+
+    return null as unknown as Nested;
+>Nested : Symbol(Nested, Decl(nameable.ts, 10, 31))
+}
+