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Change the default type parameter constraints and defaults to unknown from {} #30637

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merged 7 commits into from
Apr 4, 2019
Merged

Change the default type parameter constraints and defaults to unknown from {} #30637

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a560fd6
Change the default type parameter constraint and default to unknown f…
weswigham Mar 28, 2019
5224a6a
Merge branch 'master' into noConstraint-is-unknown
weswigham Mar 28, 2019
f907b50
Relax unknown checking outside of strictNullChecks a bit
weswigham Mar 29, 2019
5dce990
Increase strictness on index signatures with type `unknown` so infere…
weswigham Mar 29, 2019
66049c3
Merge branch 'master' into noConstraint-is-unknown
weswigham Mar 29, 2019
3b9a36c
Merge branch 'master' into noConstraint-is-unknown
weswigham Apr 4, 2019
d54a4b8
Remove redundant switch
weswigham Apr 4, 2019
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45 changes: 23 additions & 22 deletions src/compiler/checker.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -7330,7 +7330,7 @@ namespace ts {
const declaredType = <MappedType>getTypeFromMappedTypeNode(type.declaration);
const constraint = getConstraintTypeFromMappedType(declaredType);
const extendedConstraint = constraint && constraint.flags & TypeFlags.TypeParameter ? getConstraintOfTypeParameter(<TypeParameter>constraint) : constraint;
type.modifiersType = extendedConstraint && extendedConstraint.flags & TypeFlags.Index ? instantiateType((<IndexType>extendedConstraint).type, type.mapper || identityMapper) : emptyObjectType;
type.modifiersType = extendedConstraint && extendedConstraint.flags & TypeFlags.Index ? instantiateType((<IndexType>extendedConstraint).type, type.mapper || identityMapper) : unknownType;
}
}
return type.modifiersType;
Expand Down Expand Up @@ -7773,7 +7773,7 @@ namespace ts {
* type itself. Note that the apparent type of a union type is the union type itself.
*/
function getApparentType(type: Type): Type {
const t = type.flags & TypeFlags.Instantiable ? getBaseConstraintOfType(type) || emptyObjectType : type;
const t = type.flags & TypeFlags.Instantiable ? getBaseConstraintOfType(type) || (strictNullChecks ? unknownType : emptyObjectType) : type;
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return getObjectFlags(t) & ObjectFlags.Mapped ? getApparentTypeOfMappedType(<MappedType>t) :
t.flags & TypeFlags.Intersection ? getApparentTypeOfIntersectionType(<IntersectionType>t) :
t.flags & TypeFlags.StringLike ? globalStringType :
Expand All @@ -7783,6 +7783,7 @@ namespace ts {
t.flags & TypeFlags.ESSymbolLike ? getGlobalESSymbolType(/*reportErrors*/ languageVersion >= ScriptTarget.ES2015) :
t.flags & TypeFlags.NonPrimitive ? emptyObjectType :
t.flags & TypeFlags.Index ? keyofConstraintType :
t.flags & TypeFlags.Unknown && !strictNullChecks ? emptyObjectType :
t;
}

Expand Down Expand Up @@ -8106,7 +8107,7 @@ namespace ts {
const baseDefaultType = getDefaultTypeArgumentType(isJavaScriptImplicitAny);
for (let i = numTypeArguments; i < numTypeParameters; i++) {
let defaultType = getDefaultFromTypeParameter(typeParameters![i]);
if (isJavaScriptImplicitAny && defaultType && isTypeIdenticalTo(defaultType, emptyObjectType)) {
if (isJavaScriptImplicitAny && defaultType && (isTypeIdenticalTo(defaultType, unknownType) || isTypeIdenticalTo(defaultType, emptyObjectType))) {
defaultType = anyType;
}
result[i] = defaultType ? instantiateType(defaultType, createTypeMapper(typeParameters!, result)) : baseDefaultType;
Expand Down Expand Up @@ -8485,7 +8486,7 @@ namespace ts {
const typeParameters = signature.typeParameters;
if (typeParameters) {
const typeEraser = createTypeEraser(typeParameters);
const baseConstraints = map(typeParameters, tp => instantiateType(getBaseConstraintOfType(tp), typeEraser) || emptyObjectType);
const baseConstraints = map(typeParameters, tp => instantiateType(getBaseConstraintOfType(tp), typeEraser) || unknownType);
return instantiateSignature(signature, createTypeMapper(typeParameters, baseConstraints), /*eraseTypeParameters*/ true);
}
return signature;
Expand Down Expand Up @@ -10799,7 +10800,7 @@ namespace ts {
* This is used during inference when instantiating type parameter defaults.
*/
function createBackreferenceMapper(context: InferenceContext, index: number): TypeMapper {
return t => findIndex(context.inferences, info => info.typeParameter === t) >= index ? emptyObjectType : t;
return t => findIndex(context.inferences, info => info.typeParameter === t) >= index ? unknownType : t;
}

function combineTypeMappers(mapper1: TypeMapper | undefined, mapper2: TypeMapper): TypeMapper;
Expand Down Expand Up @@ -11346,7 +11347,7 @@ namespace ts {
function isTypeDerivedFrom(source: Type, target: Type): boolean {
return source.flags & TypeFlags.Union ? every((<UnionType>source).types, t => isTypeDerivedFrom(t, target)) :
target.flags & TypeFlags.Union ? some((<UnionType>target).types, t => isTypeDerivedFrom(source, t)) :
source.flags & TypeFlags.InstantiableNonPrimitive ? isTypeDerivedFrom(getBaseConstraintOfType(source) || emptyObjectType, target) :
source.flags & TypeFlags.InstantiableNonPrimitive ? isTypeDerivedFrom(getBaseConstraintOfType(source) || unknownType, target) :
target === globalObjectType ? !!(source.flags & (TypeFlags.Object | TypeFlags.NonPrimitive)) :
target === globalFunctionType ? !!(source.flags & TypeFlags.Object) && isFunctionObjectType(source as ObjectType) :
hasBaseType(source, getTargetType(target));
Expand Down Expand Up @@ -13349,7 +13350,7 @@ namespace ts {
return indexTypesIdenticalTo(source, target, kind);
}
const targetInfo = getIndexInfoOfType(target, kind);
if (!targetInfo || targetInfo.type.flags & TypeFlags.AnyOrUnknown && !sourceIsPrimitive) {
if (!targetInfo || targetInfo.type.flags & TypeFlags.Any && !sourceIsPrimitive) {
// Index signature of type any permits assignment from everything but primitives
return Ternary.True;
}
Expand Down Expand Up @@ -14500,7 +14501,7 @@ namespace ts {
const templateType = getTemplateTypeFromMappedType(target);
const inference = createInferenceInfo(typeParameter);
inferTypes([inference], sourceType, templateType);
return getTypeFromInference(inference) || emptyObjectType;
return getTypeFromInference(inference) || unknownType;
}

function* getUnmatchedProperties(source: Type, target: Type, requireOptionalProperties: boolean, matchDiscriminantProperties: boolean) {
Expand Down Expand Up @@ -15099,7 +15100,7 @@ namespace ts {
}

function getDefaultTypeArgumentType(isInJavaScriptFile: boolean): Type {
return isInJavaScriptFile ? anyType : emptyObjectType;
return isInJavaScriptFile ? anyType : unknownType;
}

function getInferredTypes(context: InferenceContext): Type[] {
Expand Down Expand Up @@ -15443,7 +15444,7 @@ namespace ts {
return strictNullChecks ? TypeFacts.ObjectStrictFacts : TypeFacts.ObjectFacts;
}
if (flags & TypeFlags.Instantiable) {
return getTypeFacts(getBaseConstraintOfType(type) || emptyObjectType);
return getTypeFacts(getBaseConstraintOfType(type) || unknownType);
}
if (flags & TypeFlags.UnionOrIntersection) {
return getTypeFactsOfTypes((<UnionOrIntersectionType>type).types);
Expand Down Expand Up @@ -16754,7 +16755,7 @@ namespace ts {
}

function typeHasNullableConstraint(type: Type) {
return type.flags & TypeFlags.InstantiableNonPrimitive && maybeTypeOfKind(getBaseConstraintOfType(type) || emptyObjectType, TypeFlags.Nullable);
return type.flags & TypeFlags.InstantiableNonPrimitive && maybeTypeOfKind(getBaseConstraintOfType(type) || unknownType, TypeFlags.Nullable);
}

function getConstraintForLocation(type: Type, node: Node): Type;
Expand Down Expand Up @@ -18204,7 +18205,7 @@ namespace ts {
}

function getJsxPropsTypeFromCallSignature(sig: Signature, context: JsxOpeningLikeElement) {
let propsType = getTypeOfFirstParameterOfSignatureWithFallback(sig, emptyObjectType);
let propsType = getTypeOfFirstParameterOfSignatureWithFallback(sig, unknownType);
propsType = getJsxManagedAttributesFromLocatedAttributes(context, getJsxNamespaceAt(context), propsType);
const intrinsicAttribs = getJsxType(JsxNames.IntrinsicAttributes, context);
if (intrinsicAttribs !== errorType) {
Expand Down Expand Up @@ -18278,7 +18279,7 @@ namespace ts {
const forcedLookupLocation = getJsxElementPropertiesName(ns);
let attributesType = forcedLookupLocation === undefined
// If there is no type ElementAttributesProperty, return the type of the first parameter of the signature, which should be the props type
? getTypeOfFirstParameterOfSignatureWithFallback(sig, emptyObjectType)
? getTypeOfFirstParameterOfSignatureWithFallback(sig, unknownType)
: forcedLookupLocation === ""
// If there is no e.g. 'props' member in ElementAttributesProperty, use the element class type instead
? getReturnTypeOfSignature(sig)
Expand All @@ -18290,7 +18291,7 @@ namespace ts {
if (!!forcedLookupLocation && !!length(context.attributes.properties)) {
error(context, Diagnostics.JSX_element_class_does_not_support_attributes_because_it_does_not_have_a_0_property, unescapeLeadingUnderscores(forcedLookupLocation));
}
return emptyObjectType;
return unknownType;
}

attributesType = getJsxManagedAttributesFromLocatedAttributes(context, ns, attributesType);
Expand Down Expand Up @@ -19501,7 +19502,7 @@ namespace ts {
undefinedDiagnostic?: DiagnosticMessage,
nullOrUndefinedDiagnostic?: DiagnosticMessage
): Type {
if (type.flags & TypeFlags.Unknown) {
if (strictNullChecks && type.flags & TypeFlags.Unknown) {
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error(node, Diagnostics.Object_is_of_type_unknown);
return errorType;
}
Expand Down Expand Up @@ -21992,7 +21993,7 @@ namespace ts {
const decl = parameter.valueDeclaration as ParameterDeclaration;
if (decl.name.kind !== SyntaxKind.Identifier) {
// if inference didn't come up with anything but {}, fall back to the binding pattern if present.
if (links.type === emptyObjectType) {
if (links.type === unknownType) {
links.type = getTypeFromBindingPattern(decl.name);
}
assignBindingElementTypes(decl.name);
Expand All @@ -22005,28 +22006,28 @@ namespace ts {
const globalPromiseType = getGlobalPromiseType(/*reportErrors*/ true);
if (globalPromiseType !== emptyGenericType) {
// if the promised type is itself a promise, get the underlying type; otherwise, fallback to the promised type
promisedType = getAwaitedType(promisedType) || emptyObjectType;
promisedType = getAwaitedType(promisedType) || unknownType;
return createTypeReference(globalPromiseType, [promisedType]);
}

return emptyObjectType;
return unknownType;
}

function createPromiseLikeType(promisedType: Type): Type {
// creates a `PromiseLike<T>` type where `T` is the promisedType argument
const globalPromiseLikeType = getGlobalPromiseLikeType(/*reportErrors*/ true);
if (globalPromiseLikeType !== emptyGenericType) {
// if the promised type is itself a promise, get the underlying type; otherwise, fallback to the promised type
promisedType = getAwaitedType(promisedType) || emptyObjectType;
promisedType = getAwaitedType(promisedType) || unknownType;
return createTypeReference(globalPromiseLikeType, [promisedType]);
}

return emptyObjectType;
return unknownType;
}

function createPromiseReturnType(func: FunctionLikeDeclaration | ImportCall, promisedType: Type) {
const promiseType = createPromiseType(promisedType);
if (promiseType === emptyObjectType) {
if (promiseType === unknownType) {
error(func, isImportCall(func) ?
Diagnostics.A_dynamic_import_call_returns_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option :
Diagnostics.An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option);
Expand Down Expand Up @@ -23459,7 +23460,7 @@ namespace ts {
// If the contextual type is a type variable constrained to a primitive type, consider
// this a literal context for literals of that primitive type. For example, given a
// type parameter 'T extends string', infer string literal types for T.
const constraint = getBaseConstraintOfType(contextualType) || emptyObjectType;
const constraint = getBaseConstraintOfType(contextualType) || unknownType;
return maybeTypeOfKind(constraint, TypeFlags.String) && maybeTypeOfKind(candidateType, TypeFlags.StringLiteral) ||
maybeTypeOfKind(constraint, TypeFlags.Number) && maybeTypeOfKind(candidateType, TypeFlags.NumberLiteral) ||
maybeTypeOfKind(constraint, TypeFlags.BigInt) && maybeTypeOfKind(candidateType, TypeFlags.BigIntLiteral) ||
Expand Down
24 changes: 12 additions & 12 deletions tests/baselines/reference/callGenericFunctionWithIncorrectNumberOfTypeArguments.types
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Original file line number Diff line number Diff line change
Expand Up @@ -136,24 +136,24 @@ class C2<T, U> {
}
}
var r6 = (new C2()).f<number>(1, '');
>r6 : {}
>(new C2()).f<number>(1, '') : {}
>(new C2()).f : (x: {}, y: {}) => {}
>(new C2()) : C2<{}, {}>
>new C2() : C2<{}, {}>
>r6 : unknown
>(new C2()).f<number>(1, '') : unknown
>(new C2()).f : (x: unknown, y: unknown) => unknown
>(new C2()) : C2<unknown, unknown>
>new C2() : C2<unknown, unknown>
>C2 : typeof C2
>f : (x: {}, y: {}) => {}
>f : (x: unknown, y: unknown) => unknown
>1 : 1
>'' : ""

var r6b = (new C2()).f<number, string, number>(1, '');
>r6b : {}
>(new C2()).f<number, string, number>(1, '') : {}
>(new C2()).f : (x: {}, y: {}) => {}
>(new C2()) : C2<{}, {}>
>new C2() : C2<{}, {}>
>r6b : unknown
>(new C2()).f<number, string, number>(1, '') : unknown
>(new C2()).f : (x: unknown, y: unknown) => unknown
>(new C2()) : C2<unknown, unknown>
>new C2() : C2<unknown, unknown>
>C2 : typeof C2
>f : (x: {}, y: {}) => {}
>f : (x: unknown, y: unknown) => unknown
>1 : 1
>'' : ""

Expand Down
12 changes: 6 additions & 6 deletions tests/baselines/reference/callGenericFunctionWithZeroTypeArguments.types
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Original file line number Diff line number Diff line change
Expand Up @@ -83,13 +83,13 @@ class C2<T> {
}
}
var r6 = (new C2()).f(1);
>r6 : {}
>(new C2()).f(1) : {}
>(new C2()).f : (x: {}) => {}
>(new C2()) : C2<{}>
>new C2() : C2<{}>
>r6 : unknown
>(new C2()).f(1) : unknown
>(new C2()).f : (x: unknown) => unknown
>(new C2()) : C2<unknown>
>new C2() : C2<unknown>
>C2 : typeof C2
>f : (x: {}) => {}
>f : (x: unknown) => unknown
>1 : 1

interface I2<T> {
Expand Down
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