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Infer fixed-size tuples from infer type parameters with extends clauses at variadic positions (#51157)
* Infer fixed-size tuples from infer type parameters with extends clauses at variadic positions * Improve the fix to handle tuples with leading variadic elements * Fixed indentation * Infer rest element following a variadic element with a fixed-size constraint * Infer rest element preceding a variadic element with a fixed-size constraint * Rewrite the test to avoid accidental union reductions
This commit is contained in:
Mateusz Burzyński
committed by
GitHub
GitHub
parent
1a943d7b68
commit
31d1d63fc8
@@ -24303,13 +24303,42 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
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}
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else {
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const middleLength = targetArity - startLength - endLength;
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if (middleLength === 2 && elementFlags[startLength] & elementFlags[startLength + 1] & ElementFlags.Variadic && isTupleType(source)) {
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// Middle of target is [...T, ...U] and source is tuple type
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const targetInfo = getInferenceInfoForType(elementTypes[startLength]);
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if (targetInfo && targetInfo.impliedArity !== undefined) {
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// Infer slices from source based on implied arity of T.
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inferFromTypes(sliceTupleType(source, startLength, endLength + sourceArity - targetInfo.impliedArity), elementTypes[startLength]);
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inferFromTypes(sliceTupleType(source, startLength + targetInfo.impliedArity, endLength), elementTypes[startLength + 1]);
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if (middleLength === 2) {
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if (elementFlags[startLength] & elementFlags[startLength + 1] & ElementFlags.Variadic && isTupleType(source)) {
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// Middle of target is [...T, ...U] and source is tuple type
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const targetInfo = getInferenceInfoForType(elementTypes[startLength]);
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if (targetInfo && targetInfo.impliedArity !== undefined) {
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// Infer slices from source based on implied arity of T.
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inferFromTypes(sliceTupleType(source, startLength, endLength + sourceArity - targetInfo.impliedArity), elementTypes[startLength]);
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inferFromTypes(sliceTupleType(source, startLength + targetInfo.impliedArity, endLength), elementTypes[startLength + 1]);
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}
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}
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else if (elementFlags[startLength] & ElementFlags.Variadic && elementFlags[startLength + 1] & ElementFlags.Rest) {
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// Middle of target is [...T, ...rest] and source is tuple type
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// if T is constrained by a fixed-size tuple we might be able to use its arity to infer T
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const param = getInferenceInfoForType(elementTypes[startLength])?.typeParameter;
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const constraint = param && getBaseConstraintOfType(param);
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if (constraint && isTupleType(constraint) && !constraint.target.hasRestElement) {
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const impliedArity = constraint.target.fixedLength;
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inferFromTypes(sliceTupleType(source, startLength, sourceArity - (startLength + impliedArity)), elementTypes[startLength]);
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inferFromTypes(getElementTypeOfSliceOfTupleType(source, startLength + impliedArity, endLength)!, elementTypes[startLength + 1]);
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}
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}
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else if (elementFlags[startLength] & ElementFlags.Rest && elementFlags[startLength + 1] & ElementFlags.Variadic && isTupleType(source)) {
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// Middle of target is [...rest, ...T] and source is tuple type
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// if T is constrained by a fixed-size tuple we might be able to use its arity to infer T
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const param = getInferenceInfoForType(elementTypes[startLength + 1])?.typeParameter;
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const constraint = param && getBaseConstraintOfType(param);
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if (constraint && isTupleType(constraint) && !constraint.target.hasRestElement) {
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const impliedArity = constraint.target.fixedLength;
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const endIndex = sourceArity - getEndElementCount(target.target, ElementFlags.Fixed);
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const startIndex = endIndex - impliedArity;
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const trailingSlice = createTupleType(getTypeArguments(source).slice(startIndex, endIndex), source.target.elementFlags.slice(startIndex, endIndex),
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/*readonly*/ false, source.target.labeledElementDeclarations && source.target.labeledElementDeclarations.slice(startIndex, endIndex));
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inferFromTypes(getElementTypeOfSliceOfTupleType(source, startLength, endLength + impliedArity)!, elementTypes[startLength]);
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inferFromTypes(trailingSlice, elementTypes[startLength + 1]);
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}
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}
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}
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else if (middleLength === 1 && elementFlags[startLength] & ElementFlags.Variadic) {
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@@ -0,0 +1,160 @@
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=== tests/cases/compiler/inferTypesWithFixedTupleExtendsAtVariadicPosition.ts ===
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// repro #51138
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type SubTup2FixedLength<T extends unknown[]> = T extends [
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>SubTup2FixedLength : Symbol(SubTup2FixedLength, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 0, 0))
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>T : Symbol(T, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 2, 24))
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>T : Symbol(T, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 2, 24))
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...infer B extends [any, any],
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>B : Symbol(B, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 3, 10))
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any
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]
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? B
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>B : Symbol(B, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 3, 10))
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: never;
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type SubTup2FixedLengthTest = SubTup2FixedLength<[a: 0, b: 1, c: 2]>;
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>SubTup2FixedLengthTest : Symbol(SubTup2FixedLengthTest, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 7, 10))
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>SubTup2FixedLength : Symbol(SubTup2FixedLength, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 0, 0))
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type SubTup2Variadic<T extends unknown[]> = T extends [
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>SubTup2Variadic : Symbol(SubTup2Variadic, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 9, 69))
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>T : Symbol(T, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 11, 21))
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>T : Symbol(T, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 11, 21))
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...infer B extends [any, any],
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>B : Symbol(B, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 12, 10))
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...any
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]
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? B
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>B : Symbol(B, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 12, 10))
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: never;
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type SubTup2VariadicTest = SubTup2Variadic<[a: 0, b: 1, ...c: 2[]]>;
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>SubTup2VariadicTest : Symbol(SubTup2VariadicTest, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 16, 10))
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>SubTup2Variadic : Symbol(SubTup2Variadic, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 9, 69))
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type SubTup2VariadicTest2 = SubTup2Variadic<[a: 0, b: 1, c: 2, ...d: 3[]]>;
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>SubTup2VariadicTest2 : Symbol(SubTup2VariadicTest2, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 18, 68))
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>SubTup2Variadic : Symbol(SubTup2Variadic, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 9, 69))
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type SubTup2VariadicAndRest<T extends unknown[]> = T extends [
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>SubTup2VariadicAndRest : Symbol(SubTup2VariadicAndRest, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 19, 75))
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>T : Symbol(T, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 21, 28))
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>T : Symbol(T, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 21, 28))
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...infer B extends [any, any],
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>B : Symbol(B, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 22, 12))
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...(infer C)[]
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>C : Symbol(C, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 23, 13))
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]
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? [...B, ...[C]]
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>B : Symbol(B, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 22, 12))
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>C : Symbol(C, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 23, 13))
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: never;
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type SubTup2VariadicAndRestTest = SubTup2VariadicAndRest<[a: 0, b: 1, ...c: 2[]]>;
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>SubTup2VariadicAndRestTest : Symbol(SubTup2VariadicAndRestTest, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 26, 12))
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>SubTup2VariadicAndRest : Symbol(SubTup2VariadicAndRest, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 19, 75))
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type SubTup2TrailingVariadic<T extends unknown[]> = T extends [
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>SubTup2TrailingVariadic : Symbol(SubTup2TrailingVariadic, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 28, 82))
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>T : Symbol(T, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 30, 29))
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>T : Symbol(T, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 30, 29))
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...any,
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...infer B extends [any, any],
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>B : Symbol(B, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 32, 10))
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]
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? B
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>B : Symbol(B, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 32, 10))
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: never;
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type SubTup2TrailingVariadicTest = SubTup2TrailingVariadic<[...a: 0[], b: 1, c: 2]>;
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>SubTup2TrailingVariadicTest : Symbol(SubTup2TrailingVariadicTest, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 35, 10))
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>SubTup2TrailingVariadic : Symbol(SubTup2TrailingVariadic, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 28, 82))
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type SubTup2TrailingVariadicTest2 = SubTup2TrailingVariadic<[...a: 0[], b: 1, c: 2, d: 3]>;
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>SubTup2TrailingVariadicTest2 : Symbol(SubTup2TrailingVariadicTest2, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 37, 84))
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>SubTup2TrailingVariadic : Symbol(SubTup2TrailingVariadic, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 28, 82))
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type SubTup2RestAndTrailingVariadic2<T extends unknown[]> = T extends [
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>SubTup2RestAndTrailingVariadic2 : Symbol(SubTup2RestAndTrailingVariadic2, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 38, 91))
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>T : Symbol(T, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 40, 37))
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>T : Symbol(T, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 40, 37))
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...(infer C)[],
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>C : Symbol(C, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 41, 13))
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...infer B extends [any, any],
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>B : Symbol(B, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 42, 12))
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]
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? [C, ...B]
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>C : Symbol(C, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 41, 13))
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>B : Symbol(B, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 42, 12))
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: never;
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type SubTup2RestAndTrailingVariadic2Test = SubTup2RestAndTrailingVariadic2<[...a: 0[], b: 1, c: 2]>;
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>SubTup2RestAndTrailingVariadic2Test : Symbol(SubTup2RestAndTrailingVariadic2Test, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 45, 12))
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>SubTup2RestAndTrailingVariadic2 : Symbol(SubTup2RestAndTrailingVariadic2, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 38, 91))
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type SubTup2VariadicWithLeadingFixedElements<T extends unknown[]> = T extends [
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>SubTup2VariadicWithLeadingFixedElements : Symbol(SubTup2VariadicWithLeadingFixedElements, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 47, 100))
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>T : Symbol(T, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 49, 45))
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>T : Symbol(T, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 49, 45))
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any,
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...infer B extends [any, any],
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>B : Symbol(B, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 51, 10))
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...any
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]
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? B
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>B : Symbol(B, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 51, 10))
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: never;
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type SubTup2VariadicWithLeadingFixedElementsTest = SubTup2VariadicWithLeadingFixedElements<[a: 0, b: 1, c: 2, ...d: 3[]]>;
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>SubTup2VariadicWithLeadingFixedElementsTest : Symbol(SubTup2VariadicWithLeadingFixedElementsTest, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 55, 10))
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>SubTup2VariadicWithLeadingFixedElements : Symbol(SubTup2VariadicWithLeadingFixedElements, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 47, 100))
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type SubTup2VariadicWithLeadingFixedElementsTest2 = SubTup2VariadicWithLeadingFixedElements<[a: 0, b: 1, c: 2, d: 3, ...e: 4[]]>;
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>SubTup2VariadicWithLeadingFixedElementsTest2 : Symbol(SubTup2VariadicWithLeadingFixedElementsTest2, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 57, 122))
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>SubTup2VariadicWithLeadingFixedElements : Symbol(SubTup2VariadicWithLeadingFixedElements, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 47, 100))
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type SubTup2TrailingVariadicWithTrailingFixedElements<T extends unknown[]> = T extends [
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>SubTup2TrailingVariadicWithTrailingFixedElements : Symbol(SubTup2TrailingVariadicWithTrailingFixedElements, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 58, 129))
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>T : Symbol(T, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 60, 54))
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>T : Symbol(T, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 60, 54))
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...any,
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...infer B extends [any, any],
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>B : Symbol(B, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 62, 10))
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any,
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]
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? B
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>B : Symbol(B, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 62, 10))
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: never;
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type SubTup2TrailingVariadicWithTrailingFixedElementsTest = SubTup2TrailingVariadicWithTrailingFixedElements<[...a: 0[], b: 1, c: 2, d: 3]>;
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>SubTup2TrailingVariadicWithTrailingFixedElementsTest : Symbol(SubTup2TrailingVariadicWithTrailingFixedElementsTest, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 66, 10))
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>SubTup2TrailingVariadicWithTrailingFixedElements : Symbol(SubTup2TrailingVariadicWithTrailingFixedElements, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 58, 129))
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type SubTup2TrailingVariadicWithTrailingFixedElementsTest2 = SubTup2TrailingVariadicWithTrailingFixedElements<[...a: 0[], b: 1, c: 2, d: 3, e: 4]>;
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>SubTup2TrailingVariadicWithTrailingFixedElementsTest2 : Symbol(SubTup2TrailingVariadicWithTrailingFixedElementsTest2, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 68, 140))
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>SubTup2TrailingVariadicWithTrailingFixedElements : Symbol(SubTup2TrailingVariadicWithTrailingFixedElements, Decl(inferTypesWithFixedTupleExtendsAtVariadicPosition.ts, 58, 129))
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@@ -0,0 +1,101 @@
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=== tests/cases/compiler/inferTypesWithFixedTupleExtendsAtVariadicPosition.ts ===
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// repro #51138
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type SubTup2FixedLength<T extends unknown[]> = T extends [
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>SubTup2FixedLength : SubTup2FixedLength<T>
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...infer B extends [any, any],
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any
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]
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? B
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: never;
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type SubTup2FixedLengthTest = SubTup2FixedLength<[a: 0, b: 1, c: 2]>;
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>SubTup2FixedLengthTest : [a: 0, b: 1]
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type SubTup2Variadic<T extends unknown[]> = T extends [
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>SubTup2Variadic : SubTup2Variadic<T>
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...infer B extends [any, any],
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...any
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]
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? B
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: never;
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type SubTup2VariadicTest = SubTup2Variadic<[a: 0, b: 1, ...c: 2[]]>;
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>SubTup2VariadicTest : [a: 0, b: 1]
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type SubTup2VariadicTest2 = SubTup2Variadic<[a: 0, b: 1, c: 2, ...d: 3[]]>;
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>SubTup2VariadicTest2 : [a: 0, b: 1]
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type SubTup2VariadicAndRest<T extends unknown[]> = T extends [
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>SubTup2VariadicAndRest : SubTup2VariadicAndRest<T>
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...infer B extends [any, any],
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...(infer C)[]
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]
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? [...B, ...[C]]
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: never;
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type SubTup2VariadicAndRestTest = SubTup2VariadicAndRest<[a: 0, b: 1, ...c: 2[]]>;
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>SubTup2VariadicAndRestTest : [0, 1, 2]
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type SubTup2TrailingVariadic<T extends unknown[]> = T extends [
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>SubTup2TrailingVariadic : SubTup2TrailingVariadic<T>
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...any,
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...infer B extends [any, any],
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]
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? B
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: never;
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type SubTup2TrailingVariadicTest = SubTup2TrailingVariadic<[...a: 0[], b: 1, c: 2]>;
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>SubTup2TrailingVariadicTest : [b: 1, c: 2]
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type SubTup2TrailingVariadicTest2 = SubTup2TrailingVariadic<[...a: 0[], b: 1, c: 2, d: 3]>;
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>SubTup2TrailingVariadicTest2 : [c: 2, d: 3]
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type SubTup2RestAndTrailingVariadic2<T extends unknown[]> = T extends [
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>SubTup2RestAndTrailingVariadic2 : SubTup2RestAndTrailingVariadic2<T>
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...(infer C)[],
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...infer B extends [any, any],
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]
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? [C, ...B]
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: never;
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type SubTup2RestAndTrailingVariadic2Test = SubTup2RestAndTrailingVariadic2<[...a: 0[], b: 1, c: 2]>;
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>SubTup2RestAndTrailingVariadic2Test : [0, 1, 2]
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type SubTup2VariadicWithLeadingFixedElements<T extends unknown[]> = T extends [
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>SubTup2VariadicWithLeadingFixedElements : SubTup2VariadicWithLeadingFixedElements<T>
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any,
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...infer B extends [any, any],
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...any
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]
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? B
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: never;
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type SubTup2VariadicWithLeadingFixedElementsTest = SubTup2VariadicWithLeadingFixedElements<[a: 0, b: 1, c: 2, ...d: 3[]]>;
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>SubTup2VariadicWithLeadingFixedElementsTest : [b: 1, c: 2]
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type SubTup2VariadicWithLeadingFixedElementsTest2 = SubTup2VariadicWithLeadingFixedElements<[a: 0, b: 1, c: 2, d: 3, ...e: 4[]]>;
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>SubTup2VariadicWithLeadingFixedElementsTest2 : [b: 1, c: 2]
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type SubTup2TrailingVariadicWithTrailingFixedElements<T extends unknown[]> = T extends [
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>SubTup2TrailingVariadicWithTrailingFixedElements : SubTup2TrailingVariadicWithTrailingFixedElements<T>
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...any,
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...infer B extends [any, any],
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any,
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]
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? B
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: never;
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type SubTup2TrailingVariadicWithTrailingFixedElementsTest = SubTup2TrailingVariadicWithTrailingFixedElements<[...a: 0[], b: 1, c: 2, d: 3]>;
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>SubTup2TrailingVariadicWithTrailingFixedElementsTest : [b: 1, c: 2]
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type SubTup2TrailingVariadicWithTrailingFixedElementsTest2 = SubTup2TrailingVariadicWithTrailingFixedElements<[...a: 0[], b: 1, c: 2, d: 3, e: 4]>;
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>SubTup2TrailingVariadicWithTrailingFixedElementsTest2 : [c: 2, d: 3]
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@@ -0,0 +1,73 @@
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// @strict: true
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// @noEmit: true
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// repro #51138
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type SubTup2FixedLength<T extends unknown[]> = T extends [
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...infer B extends [any, any],
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any
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]
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? B
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: never;
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type SubTup2FixedLengthTest = SubTup2FixedLength<[a: 0, b: 1, c: 2]>;
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type SubTup2Variadic<T extends unknown[]> = T extends [
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...infer B extends [any, any],
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...any
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]
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? B
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: never;
|
||||
|
||||
type SubTup2VariadicTest = SubTup2Variadic<[a: 0, b: 1, ...c: 2[]]>;
|
||||
type SubTup2VariadicTest2 = SubTup2Variadic<[a: 0, b: 1, c: 2, ...d: 3[]]>;
|
||||
|
||||
type SubTup2VariadicAndRest<T extends unknown[]> = T extends [
|
||||
...infer B extends [any, any],
|
||||
...(infer C)[]
|
||||
]
|
||||
? [...B, ...[C]]
|
||||
: never;
|
||||
|
||||
type SubTup2VariadicAndRestTest = SubTup2VariadicAndRest<[a: 0, b: 1, ...c: 2[]]>;
|
||||
|
||||
type SubTup2TrailingVariadic<T extends unknown[]> = T extends [
|
||||
...any,
|
||||
...infer B extends [any, any],
|
||||
]
|
||||
? B
|
||||
: never;
|
||||
|
||||
type SubTup2TrailingVariadicTest = SubTup2TrailingVariadic<[...a: 0[], b: 1, c: 2]>;
|
||||
type SubTup2TrailingVariadicTest2 = SubTup2TrailingVariadic<[...a: 0[], b: 1, c: 2, d: 3]>;
|
||||
|
||||
type SubTup2RestAndTrailingVariadic2<T extends unknown[]> = T extends [
|
||||
...(infer C)[],
|
||||
...infer B extends [any, any],
|
||||
]
|
||||
? [C, ...B]
|
||||
: never;
|
||||
|
||||
type SubTup2RestAndTrailingVariadic2Test = SubTup2RestAndTrailingVariadic2<[...a: 0[], b: 1, c: 2]>;
|
||||
|
||||
type SubTup2VariadicWithLeadingFixedElements<T extends unknown[]> = T extends [
|
||||
any,
|
||||
...infer B extends [any, any],
|
||||
...any
|
||||
]
|
||||
? B
|
||||
: never;
|
||||
|
||||
type SubTup2VariadicWithLeadingFixedElementsTest = SubTup2VariadicWithLeadingFixedElements<[a: 0, b: 1, c: 2, ...d: 3[]]>;
|
||||
type SubTup2VariadicWithLeadingFixedElementsTest2 = SubTup2VariadicWithLeadingFixedElements<[a: 0, b: 1, c: 2, d: 3, ...e: 4[]]>;
|
||||
|
||||
type SubTup2TrailingVariadicWithTrailingFixedElements<T extends unknown[]> = T extends [
|
||||
...any,
|
||||
...infer B extends [any, any],
|
||||
any,
|
||||
]
|
||||
? B
|
||||
: never;
|
||||
|
||||
type SubTup2TrailingVariadicWithTrailingFixedElementsTest = SubTup2TrailingVariadicWithTrailingFixedElements<[...a: 0[], b: 1, c: 2, d: 3]>;
|
||||
type SubTup2TrailingVariadicWithTrailingFixedElementsTest2 = SubTup2TrailingVariadicWithTrailingFixedElements<[...a: 0[], b: 1, c: 2, d: 3, e: 4]>;
|
||||
Reference in New Issue
Block a user