Flatten immediately nested conditional types in the false position (#36583)
* Flatten immediately nested conditional types in the false position * Add test * Accept new baselines * Handle nested distributive types with different checkType * Allow deeply nested immediately resolving conditionals without any syntactic requirements or implementation contortions Extract logic into function Co-authored-by: Wesley Wigham <wewigham@microsoft.com>
This commit is contained in:
Anders Hejlsberg
GitHub
parent
2458c8a016
commit
9120497a33
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@ -12889,65 +12889,82 @@ namespace ts {
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}
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function getConditionalType(root: ConditionalRoot, mapper: TypeMapper | undefined): Type {
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const checkType = instantiateType(root.checkType, mapper);
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const extendsType = instantiateType(root.extendsType, mapper);
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if (checkType === wildcardType || extendsType === wildcardType) {
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return wildcardType;
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let result;
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let extraTypes: Type[] | undefined;
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// We loop here for an immediately nested conditional type in the false position, effectively treating
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// types of the form 'A extends B ? X : C extends D ? Y : E extends F ? Z : ...' as a single construct for
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// purposes of resolution. This means such types aren't subject to the instatiation depth limiter.
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while (true) {
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const checkType = instantiateType(root.checkType, mapper);
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const checkTypeInstantiable = isGenericObjectType(checkType) || isGenericIndexType(checkType);
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const extendsType = instantiateType(root.extendsType, mapper);
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if (checkType === wildcardType || extendsType === wildcardType) {
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return wildcardType;
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}
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let combinedMapper: TypeMapper | undefined;
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if (root.inferTypeParameters) {
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const context = createInferenceContext(root.inferTypeParameters, /*signature*/ undefined, InferenceFlags.None);
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// We skip inference of the possible `infer` types unles the `extendsType` _is_ an infer type
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// if it was, it's trivial to say that extendsType = checkType, however such a pattern is used to
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// "reset" the type being build up during constraint calculation and avoid making an apparently "infinite" constraint
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// so in those cases we refain from performing inference and retain the uninfered type parameter
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if (!checkTypeInstantiable || !some(root.inferTypeParameters, t => t === extendsType)) {
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// We don't want inferences from constraints as they may cause us to eagerly resolve the
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// conditional type instead of deferring resolution. Also, we always want strict function
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// types rules (i.e. proper contravariance) for inferences.
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inferTypes(context.inferences, checkType, extendsType, InferencePriority.NoConstraints | InferencePriority.AlwaysStrict);
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}
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combinedMapper = mergeTypeMappers(mapper, context.mapper);
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}
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// Instantiate the extends type including inferences for 'infer T' type parameters
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const inferredExtendsType = combinedMapper ? instantiateType(root.extendsType, combinedMapper) : extendsType;
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// We attempt to resolve the conditional type only when the check and extends types are non-generic
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if (!checkTypeInstantiable && !isGenericObjectType(inferredExtendsType) && !isGenericIndexType(inferredExtendsType)) {
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// Return falseType for a definitely false extends check. We check an instantiations of the two
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// types with type parameters mapped to the wildcard type, the most permissive instantiations
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// possible (the wildcard type is assignable to and from all types). If those are not related,
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// then no instantiations will be and we can just return the false branch type.
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if (!(inferredExtendsType.flags & TypeFlags.AnyOrUnknown) && (checkType.flags & TypeFlags.Any || !isTypeAssignableTo(getPermissiveInstantiation(checkType), getPermissiveInstantiation(inferredExtendsType)))) {
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// Return union of trueType and falseType for 'any' since it matches anything
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if (checkType.flags & TypeFlags.Any) {
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(extraTypes || (extraTypes = [])).push(instantiateTypeWithoutDepthIncrease(root.trueType, combinedMapper || mapper));
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}
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// If falseType is an immediately nested conditional type that isn't distributive or has an
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// identical checkType, switch to that type and loop.
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const falseType = root.falseType;
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if (falseType.flags & TypeFlags.Conditional) {
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const newRoot = (<ConditionalType>falseType).root;
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if (newRoot.node.parent === root.node && (!newRoot.isDistributive || newRoot.checkType === root.checkType)) {
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root = newRoot;
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continue;
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}
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}
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result = instantiateTypeWithoutDepthIncrease(falseType, mapper);
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break;
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}
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// Return trueType for a definitely true extends check. We check instantiations of the two
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// types with type parameters mapped to their restrictive form, i.e. a form of the type parameter
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// that has no constraint. This ensures that, for example, the type
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// type Foo<T extends { x: any }> = T extends { x: string } ? string : number
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// doesn't immediately resolve to 'string' instead of being deferred.
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if (inferredExtendsType.flags & TypeFlags.AnyOrUnknown || isTypeAssignableTo(getRestrictiveInstantiation(checkType), getRestrictiveInstantiation(inferredExtendsType))) {
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result = instantiateTypeWithoutDepthIncrease(root.trueType, combinedMapper || mapper);
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break;
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}
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}
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// Return a deferred type for a check that is neither definitely true nor definitely false
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const erasedCheckType = getActualTypeVariable(checkType);
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result = <ConditionalType>createType(TypeFlags.Conditional);
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result.root = root;
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result.checkType = erasedCheckType;
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result.extendsType = extendsType;
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result.mapper = mapper;
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result.combinedMapper = combinedMapper;
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result.aliasSymbol = root.aliasSymbol;
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result.aliasTypeArguments = instantiateTypes(root.aliasTypeArguments, mapper!); // TODO: GH#18217
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break;
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}
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const checkTypeInstantiable = isGenericObjectType(checkType) || isGenericIndexType(checkType);
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let combinedMapper: TypeMapper | undefined;
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if (root.inferTypeParameters) {
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const context = createInferenceContext(root.inferTypeParameters, /*signature*/ undefined, InferenceFlags.None);
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// We skip inference of the possible `infer` types unles the `extendsType` _is_ an infer type
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// if it was, it's trivial to say that extendsType = checkType, however such a pattern is used to
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// "reset" the type being build up during constraint calculation and avoid making an apparently "infinite" constraint
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// so in those cases we refain from performing inference and retain the uninfered type parameter
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if (!checkTypeInstantiable || !some(root.inferTypeParameters, t => t === extendsType)) {
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// We don't want inferences from constraints as they may cause us to eagerly resolve the
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// conditional type instead of deferring resolution. Also, we always want strict function
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// types rules (i.e. proper contravariance) for inferences.
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inferTypes(context.inferences, checkType, extendsType, InferencePriority.NoConstraints | InferencePriority.AlwaysStrict);
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}
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combinedMapper = mergeTypeMappers(mapper, context.mapper);
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}
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// Instantiate the extends type including inferences for 'infer T' type parameters
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const inferredExtendsType = combinedMapper ? instantiateType(root.extendsType, combinedMapper) : extendsType;
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// We attempt to resolve the conditional type only when the check and extends types are non-generic
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if (!checkTypeInstantiable && !isGenericObjectType(inferredExtendsType) && !isGenericIndexType(inferredExtendsType)) {
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if (inferredExtendsType.flags & TypeFlags.AnyOrUnknown) {
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return instantiateType(root.trueType, combinedMapper || mapper);
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}
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// Return union of trueType and falseType for 'any' since it matches anything
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if (checkType.flags & TypeFlags.Any) {
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return getUnionType([instantiateType(root.trueType, combinedMapper || mapper), instantiateType(root.falseType, mapper)]);
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}
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// Return falseType for a definitely false extends check. We check an instantiations of the two
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// types with type parameters mapped to the wildcard type, the most permissive instantiations
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// possible (the wildcard type is assignable to and from all types). If those are not related,
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// then no instantiations will be and we can just return the false branch type.
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if (!isTypeAssignableTo(getPermissiveInstantiation(checkType), getPermissiveInstantiation(inferredExtendsType))) {
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return instantiateType(root.falseType, mapper);
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}
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// Return trueType for a definitely true extends check. We check instantiations of the two
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// types with type parameters mapped to their restrictive form, i.e. a form of the type parameter
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// that has no constraint. This ensures that, for example, the type
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// type Foo<T extends { x: any }> = T extends { x: string } ? string : number
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// doesn't immediately resolve to 'string' instead of being deferred.
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if (isTypeAssignableTo(getRestrictiveInstantiation(checkType), getRestrictiveInstantiation(inferredExtendsType))) {
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return instantiateType(root.trueType, combinedMapper || mapper);
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}
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}
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// Return a deferred type for a check that is neither definitely true nor definitely false
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const erasedCheckType = getActualTypeVariable(checkType);
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const result = <ConditionalType>createType(TypeFlags.Conditional);
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result.root = root;
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result.checkType = erasedCheckType;
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result.extendsType = extendsType;
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result.mapper = mapper;
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result.combinedMapper = combinedMapper;
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result.aliasSymbol = root.aliasSymbol;
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result.aliasTypeArguments = instantiateTypes(root.aliasTypeArguments, mapper!); // TODO: GH#18217
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return result;
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return extraTypes ? getUnionType(append(extraTypes, result)) : result;
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}
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function getTrueTypeFromConditionalType(type: ConditionalType) {
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@ -13929,6 +13946,17 @@ namespace ts {
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return result;
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}
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/**
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* This can be used to avoid the penalty on instantiation depth for types which result from immediate
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* simplification. It essentially removes the depth increase done in `instantiateType`.
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*/
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function instantiateTypeWithoutDepthIncrease(type: Type, mapper: TypeMapper | undefined) {
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instantiationDepth--;
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const result = instantiateType(type, mapper);
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instantiationDepth++;
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return result;
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}
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function instantiateTypeWorker(type: Type, mapper: TypeMapper): Type {
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const flags = type.flags;
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if (flags & TypeFlags.TypeParameter) {
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116
tests/baselines/reference/deeplyNestedConditionalTypes.js
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116
tests/baselines/reference/deeplyNestedConditionalTypes.js
Normal file
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@ -0,0 +1,116 @@
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//// [deeplyNestedConditionalTypes.ts]
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type Foo<T> =
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T extends 0 ? '0' :
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T extends 1 ? '1' :
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T extends 2 ? '2' :
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T extends 3 ? '3' :
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T extends 4 ? '4' :
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T extends 5 ? '5' :
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T extends 6 ? '6' :
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T extends 7 ? '7' :
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T extends 8 ? '8' :
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T extends 9 ? '9' :
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T extends 10 ? '10' :
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T extends 11 ? '11' :
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T extends 12 ? '12' :
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T extends 13 ? '13' :
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T extends 14 ? '14' :
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T extends 15 ? '15' :
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T extends 16 ? '16' :
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T extends 17 ? '17' :
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T extends 18 ? '18' :
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T extends 19 ? '19' :
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T extends 20 ? '20' :
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T extends 21 ? '21' :
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T extends 22 ? '22' :
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T extends 23 ? '23' :
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T extends 24 ? '24' :
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T extends 25 ? '25' :
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T extends 26 ? '26' :
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T extends 27 ? '27' :
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T extends 28 ? '28' :
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T extends 29 ? '29' :
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T extends 30 ? '30' :
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T extends 31 ? '31' :
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T extends 32 ? '32' :
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T extends 33 ? '33' :
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T extends 34 ? '34' :
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T extends 35 ? '35' :
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T extends 36 ? '36' :
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T extends 37 ? '37' :
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T extends 38 ? '38' :
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T extends 39 ? '39' :
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T extends 40 ? '40' :
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T extends 41 ? '41' :
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T extends 42 ? '42' :
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T extends 43 ? '43' :
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T extends 44 ? '44' :
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T extends 45 ? '45' :
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T extends 46 ? '46' :
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T extends 47 ? '47' :
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T extends 48 ? '48' :
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T extends 49 ? '49' :
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T extends 50 ? '50' :
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T extends 51 ? '51' :
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T extends 52 ? '52' :
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T extends 53 ? '53' :
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T extends 54 ? '54' :
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T extends 55 ? '55' :
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T extends 56 ? '56' :
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T extends 57 ? '57' :
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T extends 58 ? '58' :
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T extends 59 ? '59' :
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T extends 60 ? '60' :
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T extends 61 ? '61' :
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T extends 62 ? '62' :
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T extends 63 ? '63' :
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T extends 64 ? '64' :
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T extends 65 ? '65' :
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T extends 66 ? '66' :
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T extends 67 ? '67' :
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T extends 68 ? '68' :
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T extends 69 ? '69' :
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T extends 70 ? '70' :
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T extends 71 ? '71' :
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T extends 72 ? '72' :
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T extends 73 ? '73' :
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T extends 74 ? '74' :
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T extends 75 ? '75' :
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T extends 76 ? '76' :
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T extends 77 ? '77' :
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T extends 78 ? '78' :
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T extends 79 ? '79' :
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T extends 80 ? '80' :
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T extends 81 ? '81' :
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T extends 82 ? '82' :
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T extends 83 ? '83' :
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T extends 84 ? '84' :
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T extends 85 ? '85' :
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T extends 86 ? '86' :
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T extends 87 ? '87' :
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T extends 88 ? '88' :
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T extends 89 ? '89' :
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T extends 90 ? '90' :
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T extends 91 ? '91' :
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T extends 92 ? '92' :
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T extends 93 ? '93' :
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T extends 94 ? '94' :
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T extends 95 ? '95' :
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T extends 96 ? '96' :
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T extends 97 ? '97' :
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T extends 98 ? '98' :
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T extends 99 ? '99' :
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never;
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type T0 = Foo<99>;
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type T1 = Foo<any>;
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//// [deeplyNestedConditionalTypes.js]
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"use strict";
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//// [deeplyNestedConditionalTypes.d.ts]
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declare type Foo<T> = T extends 0 ? '0' : T extends 1 ? '1' : T extends 2 ? '2' : T extends 3 ? '3' : T extends 4 ? '4' : T extends 5 ? '5' : T extends 6 ? '6' : T extends 7 ? '7' : T extends 8 ? '8' : T extends 9 ? '9' : T extends 10 ? '10' : T extends 11 ? '11' : T extends 12 ? '12' : T extends 13 ? '13' : T extends 14 ? '14' : T extends 15 ? '15' : T extends 16 ? '16' : T extends 17 ? '17' : T extends 18 ? '18' : T extends 19 ? '19' : T extends 20 ? '20' : T extends 21 ? '21' : T extends 22 ? '22' : T extends 23 ? '23' : T extends 24 ? '24' : T extends 25 ? '25' : T extends 26 ? '26' : T extends 27 ? '27' : T extends 28 ? '28' : T extends 29 ? '29' : T extends 30 ? '30' : T extends 31 ? '31' : T extends 32 ? '32' : T extends 33 ? '33' : T extends 34 ? '34' : T extends 35 ? '35' : T extends 36 ? '36' : T extends 37 ? '37' : T extends 38 ? '38' : T extends 39 ? '39' : T extends 40 ? '40' : T extends 41 ? '41' : T extends 42 ? '42' : T extends 43 ? '43' : T extends 44 ? '44' : T extends 45 ? '45' : T extends 46 ? '46' : T extends 47 ? '47' : T extends 48 ? '48' : T extends 49 ? '49' : T extends 50 ? '50' : T extends 51 ? '51' : T extends 52 ? '52' : T extends 53 ? '53' : T extends 54 ? '54' : T extends 55 ? '55' : T extends 56 ? '56' : T extends 57 ? '57' : T extends 58 ? '58' : T extends 59 ? '59' : T extends 60 ? '60' : T extends 61 ? '61' : T extends 62 ? '62' : T extends 63 ? '63' : T extends 64 ? '64' : T extends 65 ? '65' : T extends 66 ? '66' : T extends 67 ? '67' : T extends 68 ? '68' : T extends 69 ? '69' : T extends 70 ? '70' : T extends 71 ? '71' : T extends 72 ? '72' : T extends 73 ? '73' : T extends 74 ? '74' : T extends 75 ? '75' : T extends 76 ? '76' : T extends 77 ? '77' : T extends 78 ? '78' : T extends 79 ? '79' : T extends 80 ? '80' : T extends 81 ? '81' : T extends 82 ? '82' : T extends 83 ? '83' : T extends 84 ? '84' : T extends 85 ? '85' : T extends 86 ? '86' : T extends 87 ? '87' : T extends 88 ? '88' : T extends 89 ? '89' : T extends 90 ? '90' : T extends 91 ? '91' : T extends 92 ? '92' : T extends 93 ? '93' : T extends 94 ? '94' : T extends 95 ? '95' : T extends 96 ? '96' : T extends 97 ? '97' : T extends 98 ? '98' : T extends 99 ? '99' : never;
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declare type T0 = Foo<99>;
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declare type T1 = Foo<any>;
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315
tests/baselines/reference/deeplyNestedConditionalTypes.symbols
Normal file
315
tests/baselines/reference/deeplyNestedConditionalTypes.symbols
Normal file
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@ -0,0 +1,315 @@
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=== tests/cases/compiler/deeplyNestedConditionalTypes.ts ===
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type Foo<T> =
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>Foo : Symbol(Foo, Decl(deeplyNestedConditionalTypes.ts, 0, 0))
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 0 ? '0' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 1 ? '1' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 2 ? '2' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 3 ? '3' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 4 ? '4' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 5 ? '5' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 6 ? '6' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 7 ? '7' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 8 ? '8' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 9 ? '9' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 10 ? '10' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 11 ? '11' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 12 ? '12' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 13 ? '13' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 14 ? '14' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 15 ? '15' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 16 ? '16' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 17 ? '17' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 18 ? '18' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 19 ? '19' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 20 ? '20' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 21 ? '21' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 22 ? '22' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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T extends 23 ? '23' :
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>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
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|
||||
T extends 24 ? '24' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 25 ? '25' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 26 ? '26' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 27 ? '27' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 28 ? '28' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 29 ? '29' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 30 ? '30' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 31 ? '31' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 32 ? '32' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 33 ? '33' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 34 ? '34' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 35 ? '35' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 36 ? '36' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 37 ? '37' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 38 ? '38' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 39 ? '39' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 40 ? '40' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 41 ? '41' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 42 ? '42' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 43 ? '43' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 44 ? '44' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 45 ? '45' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 46 ? '46' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 47 ? '47' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 48 ? '48' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 49 ? '49' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 50 ? '50' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 51 ? '51' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 52 ? '52' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 53 ? '53' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 54 ? '54' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 55 ? '55' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 56 ? '56' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 57 ? '57' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 58 ? '58' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 59 ? '59' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 60 ? '60' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 61 ? '61' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 62 ? '62' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 63 ? '63' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 64 ? '64' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 65 ? '65' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 66 ? '66' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 67 ? '67' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 68 ? '68' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 69 ? '69' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 70 ? '70' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 71 ? '71' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 72 ? '72' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 73 ? '73' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 74 ? '74' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 75 ? '75' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 76 ? '76' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 77 ? '77' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 78 ? '78' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 79 ? '79' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 80 ? '80' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 81 ? '81' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 82 ? '82' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 83 ? '83' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 84 ? '84' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 85 ? '85' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 86 ? '86' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 87 ? '87' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 88 ? '88' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 89 ? '89' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 90 ? '90' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 91 ? '91' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 92 ? '92' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 93 ? '93' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 94 ? '94' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 95 ? '95' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 96 ? '96' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 97 ? '97' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 98 ? '98' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
T extends 99 ? '99' :
|
||||
>T : Symbol(T, Decl(deeplyNestedConditionalTypes.ts, 0, 9))
|
||||
|
||||
never;
|
||||
|
||||
type T0 = Foo<99>;
|
||||
>T0 : Symbol(T0, Decl(deeplyNestedConditionalTypes.ts, 101, 10))
|
||||
>Foo : Symbol(Foo, Decl(deeplyNestedConditionalTypes.ts, 0, 0))
|
||||
|
||||
type T1 = Foo<any>;
|
||||
>T1 : Symbol(T1, Decl(deeplyNestedConditionalTypes.ts, 103, 18))
|
||||
>Foo : Symbol(Foo, Decl(deeplyNestedConditionalTypes.ts, 0, 0))
|
||||
|
||||
112
tests/baselines/reference/deeplyNestedConditionalTypes.types
Normal file
112
tests/baselines/reference/deeplyNestedConditionalTypes.types
Normal file
|
|
@ -0,0 +1,112 @@
|
|||
=== tests/cases/compiler/deeplyNestedConditionalTypes.ts ===
|
||||
type Foo<T> =
|
||||
>Foo : Foo<T>
|
||||
|
||||
T extends 0 ? '0' :
|
||||
T extends 1 ? '1' :
|
||||
T extends 2 ? '2' :
|
||||
T extends 3 ? '3' :
|
||||
T extends 4 ? '4' :
|
||||
T extends 5 ? '5' :
|
||||
T extends 6 ? '6' :
|
||||
T extends 7 ? '7' :
|
||||
T extends 8 ? '8' :
|
||||
T extends 9 ? '9' :
|
||||
T extends 10 ? '10' :
|
||||
T extends 11 ? '11' :
|
||||
T extends 12 ? '12' :
|
||||
T extends 13 ? '13' :
|
||||
T extends 14 ? '14' :
|
||||
T extends 15 ? '15' :
|
||||
T extends 16 ? '16' :
|
||||
T extends 17 ? '17' :
|
||||
T extends 18 ? '18' :
|
||||
T extends 19 ? '19' :
|
||||
T extends 20 ? '20' :
|
||||
T extends 21 ? '21' :
|
||||
T extends 22 ? '22' :
|
||||
T extends 23 ? '23' :
|
||||
T extends 24 ? '24' :
|
||||
T extends 25 ? '25' :
|
||||
T extends 26 ? '26' :
|
||||
T extends 27 ? '27' :
|
||||
T extends 28 ? '28' :
|
||||
T extends 29 ? '29' :
|
||||
T extends 30 ? '30' :
|
||||
T extends 31 ? '31' :
|
||||
T extends 32 ? '32' :
|
||||
T extends 33 ? '33' :
|
||||
T extends 34 ? '34' :
|
||||
T extends 35 ? '35' :
|
||||
T extends 36 ? '36' :
|
||||
T extends 37 ? '37' :
|
||||
T extends 38 ? '38' :
|
||||
T extends 39 ? '39' :
|
||||
T extends 40 ? '40' :
|
||||
T extends 41 ? '41' :
|
||||
T extends 42 ? '42' :
|
||||
T extends 43 ? '43' :
|
||||
T extends 44 ? '44' :
|
||||
T extends 45 ? '45' :
|
||||
T extends 46 ? '46' :
|
||||
T extends 47 ? '47' :
|
||||
T extends 48 ? '48' :
|
||||
T extends 49 ? '49' :
|
||||
T extends 50 ? '50' :
|
||||
T extends 51 ? '51' :
|
||||
T extends 52 ? '52' :
|
||||
T extends 53 ? '53' :
|
||||
T extends 54 ? '54' :
|
||||
T extends 55 ? '55' :
|
||||
T extends 56 ? '56' :
|
||||
T extends 57 ? '57' :
|
||||
T extends 58 ? '58' :
|
||||
T extends 59 ? '59' :
|
||||
T extends 60 ? '60' :
|
||||
T extends 61 ? '61' :
|
||||
T extends 62 ? '62' :
|
||||
T extends 63 ? '63' :
|
||||
T extends 64 ? '64' :
|
||||
T extends 65 ? '65' :
|
||||
T extends 66 ? '66' :
|
||||
T extends 67 ? '67' :
|
||||
T extends 68 ? '68' :
|
||||
T extends 69 ? '69' :
|
||||
T extends 70 ? '70' :
|
||||
T extends 71 ? '71' :
|
||||
T extends 72 ? '72' :
|
||||
T extends 73 ? '73' :
|
||||
T extends 74 ? '74' :
|
||||
T extends 75 ? '75' :
|
||||
T extends 76 ? '76' :
|
||||
T extends 77 ? '77' :
|
||||
T extends 78 ? '78' :
|
||||
T extends 79 ? '79' :
|
||||
T extends 80 ? '80' :
|
||||
T extends 81 ? '81' :
|
||||
T extends 82 ? '82' :
|
||||
T extends 83 ? '83' :
|
||||
T extends 84 ? '84' :
|
||||
T extends 85 ? '85' :
|
||||
T extends 86 ? '86' :
|
||||
T extends 87 ? '87' :
|
||||
T extends 88 ? '88' :
|
||||
T extends 89 ? '89' :
|
||||
T extends 90 ? '90' :
|
||||
T extends 91 ? '91' :
|
||||
T extends 92 ? '92' :
|
||||
T extends 93 ? '93' :
|
||||
T extends 94 ? '94' :
|
||||
T extends 95 ? '95' :
|
||||
T extends 96 ? '96' :
|
||||
T extends 97 ? '97' :
|
||||
T extends 98 ? '98' :
|
||||
T extends 99 ? '99' :
|
||||
never;
|
||||
|
||||
type T0 = Foo<99>;
|
||||
>T0 : "99"
|
||||
|
||||
type T1 = Foo<any>;
|
||||
>T1 : "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" | "71" | "72" | "73" | "74" | "75" | "76" | "77" | "78" | "79" | "80" | "81" | "82" | "83" | "84" | "85" | "86" | "87" | "88" | "89" | "90" | "91" | "92" | "93" | "94" | "95" | "96" | "97" | "98" | "99"
|
||||
|
||||
108
tests/cases/compiler/deeplyNestedConditionalTypes.ts
Normal file
108
tests/cases/compiler/deeplyNestedConditionalTypes.ts
Normal file
|
|
@ -0,0 +1,108 @@
|
|||
// @strict: true
|
||||
// @declaration: true
|
||||
|
||||
type Foo<T> =
|
||||
T extends 0 ? '0' :
|
||||
T extends 1 ? '1' :
|
||||
T extends 2 ? '2' :
|
||||
T extends 3 ? '3' :
|
||||
T extends 4 ? '4' :
|
||||
T extends 5 ? '5' :
|
||||
T extends 6 ? '6' :
|
||||
T extends 7 ? '7' :
|
||||
T extends 8 ? '8' :
|
||||
T extends 9 ? '9' :
|
||||
T extends 10 ? '10' :
|
||||
T extends 11 ? '11' :
|
||||
T extends 12 ? '12' :
|
||||
T extends 13 ? '13' :
|
||||
T extends 14 ? '14' :
|
||||
T extends 15 ? '15' :
|
||||
T extends 16 ? '16' :
|
||||
T extends 17 ? '17' :
|
||||
T extends 18 ? '18' :
|
||||
T extends 19 ? '19' :
|
||||
T extends 20 ? '20' :
|
||||
T extends 21 ? '21' :
|
||||
T extends 22 ? '22' :
|
||||
T extends 23 ? '23' :
|
||||
T extends 24 ? '24' :
|
||||
T extends 25 ? '25' :
|
||||
T extends 26 ? '26' :
|
||||
T extends 27 ? '27' :
|
||||
T extends 28 ? '28' :
|
||||
T extends 29 ? '29' :
|
||||
T extends 30 ? '30' :
|
||||
T extends 31 ? '31' :
|
||||
T extends 32 ? '32' :
|
||||
T extends 33 ? '33' :
|
||||
T extends 34 ? '34' :
|
||||
T extends 35 ? '35' :
|
||||
T extends 36 ? '36' :
|
||||
T extends 37 ? '37' :
|
||||
T extends 38 ? '38' :
|
||||
T extends 39 ? '39' :
|
||||
T extends 40 ? '40' :
|
||||
T extends 41 ? '41' :
|
||||
T extends 42 ? '42' :
|
||||
T extends 43 ? '43' :
|
||||
T extends 44 ? '44' :
|
||||
T extends 45 ? '45' :
|
||||
T extends 46 ? '46' :
|
||||
T extends 47 ? '47' :
|
||||
T extends 48 ? '48' :
|
||||
T extends 49 ? '49' :
|
||||
T extends 50 ? '50' :
|
||||
T extends 51 ? '51' :
|
||||
T extends 52 ? '52' :
|
||||
T extends 53 ? '53' :
|
||||
T extends 54 ? '54' :
|
||||
T extends 55 ? '55' :
|
||||
T extends 56 ? '56' :
|
||||
T extends 57 ? '57' :
|
||||
T extends 58 ? '58' :
|
||||
T extends 59 ? '59' :
|
||||
T extends 60 ? '60' :
|
||||
T extends 61 ? '61' :
|
||||
T extends 62 ? '62' :
|
||||
T extends 63 ? '63' :
|
||||
T extends 64 ? '64' :
|
||||
T extends 65 ? '65' :
|
||||
T extends 66 ? '66' :
|
||||
T extends 67 ? '67' :
|
||||
T extends 68 ? '68' :
|
||||
T extends 69 ? '69' :
|
||||
T extends 70 ? '70' :
|
||||
T extends 71 ? '71' :
|
||||
T extends 72 ? '72' :
|
||||
T extends 73 ? '73' :
|
||||
T extends 74 ? '74' :
|
||||
T extends 75 ? '75' :
|
||||
T extends 76 ? '76' :
|
||||
T extends 77 ? '77' :
|
||||
T extends 78 ? '78' :
|
||||
T extends 79 ? '79' :
|
||||
T extends 80 ? '80' :
|
||||
T extends 81 ? '81' :
|
||||
T extends 82 ? '82' :
|
||||
T extends 83 ? '83' :
|
||||
T extends 84 ? '84' :
|
||||
T extends 85 ? '85' :
|
||||
T extends 86 ? '86' :
|
||||
T extends 87 ? '87' :
|
||||
T extends 88 ? '88' :
|
||||
T extends 89 ? '89' :
|
||||
T extends 90 ? '90' :
|
||||
T extends 91 ? '91' :
|
||||
T extends 92 ? '92' :
|
||||
T extends 93 ? '93' :
|
||||
T extends 94 ? '94' :
|
||||
T extends 95 ? '95' :
|
||||
T extends 96 ? '96' :
|
||||
T extends 97 ? '97' :
|
||||
T extends 98 ? '98' :
|
||||
T extends 99 ? '99' :
|
||||
never;
|
||||
|
||||
type T0 = Foo<99>;
|
||||
type T1 = Foo<any>;
|
||||
Loading…
Reference in a new issue