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jsx.go
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package checker
import (
"math"
"slices"
"github.com/microsoft/typescript-go/internal/ast"
"github.com/microsoft/typescript-go/internal/core"
"github.com/microsoft/typescript-go/internal/diagnostics"
"github.com/microsoft/typescript-go/internal/jsnum"
"github.com/microsoft/typescript-go/internal/parser"
"github.com/microsoft/typescript-go/internal/scanner"
)
type JsxFlags uint32
const (
JsxFlagsNone JsxFlags = 0
JsxFlagsIntrinsicNamedElement JsxFlags = 1 << 0 // An element from a named property of the JSX.IntrinsicElements interface
JsxFlagsIntrinsicIndexedElement JsxFlags = 1 << 1 // An element inferred from the string index signature of the JSX.IntrinsicElements interface
JsxFlagsIntrinsicElement JsxFlags = JsxFlagsIntrinsicNamedElement | JsxFlagsIntrinsicIndexedElement
)
type JsxReferenceKind int32
const (
JsxReferenceKindComponent JsxReferenceKind = iota
JsxReferenceKindFunction
JsxReferenceKindMixed
)
type JsxElementLinks struct {
jsxFlags JsxFlags // Flags for the JSX element
resolvedJsxElementAttributesType *Type // Resolved element attributes type of a JSX opening-like element
jsxNamespace *ast.Symbol // Resolved JSX namespace symbol for this node
jsxImplicitImportContainer *ast.Symbol // Resolved module symbol the implicit JSX import of this file should refer to
}
var JsxNames = struct {
JSX string
IntrinsicElements string
ElementClass string
ElementAttributesPropertyNameContainer string
ElementChildrenAttributeNameContainer string
Element string
ElementType string
IntrinsicAttributes string
IntrinsicClassAttributes string
LibraryManagedAttributes string
}{
JSX: "JSX",
IntrinsicElements: "IntrinsicElements",
ElementClass: "ElementClass",
ElementAttributesPropertyNameContainer: "ElementAttributesProperty",
ElementChildrenAttributeNameContainer: "ElementChildrenAttribute",
Element: "Element",
ElementType: "ElementType",
IntrinsicAttributes: "IntrinsicAttributes",
IntrinsicClassAttributes: "IntrinsicClassAttributes",
LibraryManagedAttributes: "LibraryManagedAttributes",
}
func (c *Checker) checkJsxElement(node *ast.Node, checkMode CheckMode) *Type {
c.checkNodeDeferred(node)
return c.getJsxElementTypeAt(node)
}
func (c *Checker) checkJsxElementDeferred(node *ast.Node) {
jsxElement := node.AsJsxElement()
c.checkJsxOpeningLikeElementOrOpeningFragment(jsxElement.OpeningElement)
// Perform resolution on the closing tag so that rename/go to definition/etc work
if isJsxIntrinsicTagName(jsxElement.ClosingElement.TagName()) {
c.getIntrinsicTagSymbol(jsxElement.ClosingElement)
} else {
c.checkExpression(jsxElement.ClosingElement.TagName())
}
c.checkJsxChildren(node, CheckModeNormal)
}
func (c *Checker) checkJsxExpression(node *ast.Node, checkMode CheckMode) *Type {
c.checkGrammarJsxExpression(node.AsJsxExpression())
if node.Expression() == nil {
return c.errorType
}
t := c.checkExpressionEx(node.Expression(), checkMode)
if node.AsJsxExpression().DotDotDotToken != nil && t != c.anyType && !c.isArrayType(t) {
c.error(node, diagnostics.JSX_spread_child_must_be_an_array_type)
}
return t
}
func (c *Checker) checkJsxSelfClosingElement(node *ast.Node, checkMode CheckMode) *Type {
c.checkNodeDeferred(node)
return c.getJsxElementTypeAt(node)
}
func (c *Checker) checkJsxSelfClosingElementDeferred(node *ast.Node) {
c.checkJsxOpeningLikeElementOrOpeningFragment(node)
}
func (c *Checker) checkJsxFragment(node *ast.Node) *Type {
c.checkJsxOpeningLikeElementOrOpeningFragment(node.AsJsxFragment().OpeningFragment)
// by default, jsx:'react' will use jsxFactory = React.createElement and jsxFragmentFactory = React.Fragment
// if jsxFactory compiler option is provided, ensure jsxFragmentFactory compiler option or @jsxFrag pragma is provided too
nodeSourceFile := ast.GetSourceFileOfNode(node)
if c.compilerOptions.GetJSXTransformEnabled() && (c.compilerOptions.JsxFactory != "" || ast.GetPragmaFromSourceFile(nodeSourceFile, "jsx") != nil) && c.compilerOptions.JsxFragmentFactory == "" && ast.GetPragmaFromSourceFile(nodeSourceFile, "jsxfrag") == nil {
message := core.IfElse(c.compilerOptions.JsxFactory != "",
diagnostics.The_jsxFragmentFactory_compiler_option_must_be_provided_to_use_JSX_fragments_with_the_jsxFactory_compiler_option,
diagnostics.An_jsxFrag_pragma_is_required_when_using_an_jsx_pragma_with_JSX_fragments)
c.error(node, message)
}
c.checkJsxChildren(node, CheckModeNormal)
return c.getJsxElementTypeAt(node)
}
func (c *Checker) checkJsxAttributes(node *ast.Node, checkMode CheckMode) *Type {
return c.createJsxAttributesTypeFromAttributesProperty(node.Parent, checkMode)
}
func (c *Checker) checkJsxOpeningLikeElementOrOpeningFragment(node *ast.Node) {
isNodeOpeningLikeElement := isJsxOpeningLikeElement(node)
if isNodeOpeningLikeElement {
c.checkGrammarJsxElement(node)
}
c.checkJsxPreconditions(node)
c.markJsxAliasReferenced(node)
if isNodeOpeningLikeElement {
sig := c.getResolvedSignature(node, nil, CheckModeNormal)
c.checkDeprecatedSignature(sig, node)
elementTypeConstraint := c.getJsxElementTypeTypeAt(node)
if elementTypeConstraint != nil {
tagName := node.TagName()
var tagType *Type
if isJsxIntrinsicTagName(tagName) {
tagType = c.getStringLiteralType(tagName.Text())
} else {
tagType = c.checkExpression(tagName)
}
var diags []*ast.Diagnostic
if !c.checkTypeRelatedToEx(tagType, elementTypeConstraint, c.assignableRelation, tagName, diagnostics.Its_type_0_is_not_a_valid_JSX_element_type, &diags) {
c.diagnostics.Add(ast.NewDiagnosticChain(diags[0], diagnostics.X_0_cannot_be_used_as_a_JSX_component, scanner.GetTextOfNode(tagName)))
}
} else {
c.checkJsxReturnAssignableToAppropriateBound(c.getJsxReferenceKind(node), c.getReturnTypeOfSignature(sig), node)
}
}
}
func (c *Checker) checkJsxPreconditions(errorNode *ast.Node) {
// Preconditions for using JSX
if c.compilerOptions.Jsx == core.JsxEmitNone {
c.error(errorNode, diagnostics.Cannot_use_JSX_unless_the_jsx_flag_is_provided)
}
if c.noImplicitAny && c.getJsxElementTypeAt(errorNode) == nil {
c.error(errorNode, diagnostics.JSX_element_implicitly_has_type_any_because_the_global_type_JSX_Element_does_not_exist)
}
}
func (c *Checker) checkJsxReturnAssignableToAppropriateBound(refKind JsxReferenceKind, elemInstanceType *Type, openingLikeElement *ast.Node) {
var diags []*ast.Diagnostic
switch refKind {
case JsxReferenceKindFunction:
sfcReturnConstraint := c.getJsxStatelessElementTypeAt(openingLikeElement)
if sfcReturnConstraint != nil {
c.checkTypeRelatedToEx(elemInstanceType, sfcReturnConstraint, c.assignableRelation, openingLikeElement.TagName(), diagnostics.Its_return_type_0_is_not_a_valid_JSX_element, &diags)
}
case JsxReferenceKindComponent:
classConstraint := c.getJsxElementClassTypeAt(openingLikeElement)
if classConstraint != nil {
// Issue an error if this return type isn't assignable to JSX.ElementClass, failing that
c.checkTypeRelatedToEx(elemInstanceType, classConstraint, c.assignableRelation, openingLikeElement.TagName(), diagnostics.Its_instance_type_0_is_not_a_valid_JSX_element, &diags)
}
default:
sfcReturnConstraint := c.getJsxStatelessElementTypeAt(openingLikeElement)
classConstraint := c.getJsxElementClassTypeAt(openingLikeElement)
if sfcReturnConstraint == nil || classConstraint == nil {
return
}
combined := c.getUnionType([]*Type{sfcReturnConstraint, classConstraint})
c.checkTypeRelatedToEx(elemInstanceType, combined, c.assignableRelation, openingLikeElement.TagName(), diagnostics.Its_element_type_0_is_not_a_valid_JSX_element, &diags)
}
if len(diags) != 0 {
c.diagnostics.Add(ast.NewDiagnosticChain(diags[0], diagnostics.X_0_cannot_be_used_as_a_JSX_component, scanner.GetTextOfNode(openingLikeElement.TagName())))
}
}
func (c *Checker) inferJsxTypeArguments(node *ast.Node, signature *Signature, checkMode CheckMode, context *InferenceContext) []*Type {
paramType := c.getEffectiveFirstArgumentForJsxSignature(signature, node)
checkAttrType := c.checkExpressionWithContextualType(node.Attributes(), paramType, context, checkMode)
c.inferTypes(context.inferences, checkAttrType, paramType, InferencePriorityNone, false)
return c.getInferredTypes(context)
}
func (c *Checker) getContextualTypeForJsxExpression(node *ast.Node, contextFlags ContextFlags) *Type {
switch {
case ast.IsJsxAttributeLike(node.Parent):
return c.getContextualType(node, contextFlags)
case ast.IsJsxElement(node.Parent):
return c.getContextualTypeForChildJsxExpression(node.Parent, node, contextFlags)
}
return nil
}
func (c *Checker) getContextualTypeForJsxAttribute(attribute *ast.Node, contextFlags ContextFlags) *Type {
// When we trying to resolve JsxOpeningLikeElement as a stateless function element, we will already give its attributes a contextual type
// which is a type of the parameter of the signature we are trying out.
// If there is no contextual type (e.g. we are trying to resolve stateful component), get attributes type from resolving element's tagName
if ast.IsJsxAttribute(attribute) {
attributesType := c.getApparentTypeOfContextualType(attribute.Parent, contextFlags)
if attributesType == nil || IsTypeAny(attributesType) {
return nil
}
return c.getTypeOfPropertyOfContextualType(attributesType, attribute.Name().Text())
}
return c.getContextualType(attribute.Parent, contextFlags)
}
func (c *Checker) getContextualJsxElementAttributesType(node *ast.Node, contextFlags ContextFlags) *Type {
if ast.IsJsxOpeningElement(node) && contextFlags != ContextFlagsCompletions {
index := c.findContextualNode(node.Parent, contextFlags == ContextFlagsNone)
if index >= 0 {
// Contextually applied type is moved from attributes up to the outer jsx attributes so when walking up from the children they get hit
// _However_ to hit them from the _attributes_ we must look for them here; otherwise we'll used the declared type
// (as below) instead!
return c.contextualInfos[index].t
}
}
return c.getContextualTypeForArgumentAtIndex(node, 0)
}
func (c *Checker) getContextualTypeForChildJsxExpression(node *ast.Node, child *ast.JsxChild, contextFlags ContextFlags) *Type {
attributesType := c.getApparentTypeOfContextualType(node.AsJsxElement().OpeningElement.Attributes(), contextFlags)
// JSX expression is in children of JSX Element, we will look for an "children" attribute (we get the name from JSX.ElementAttributesProperty)
jsxChildrenPropertyName := c.getJsxElementChildrenPropertyName(c.getJsxNamespaceAt(node))
if !(attributesType != nil && !IsTypeAny(attributesType) && jsxChildrenPropertyName != ast.InternalSymbolNameMissing && jsxChildrenPropertyName != "") {
return nil
}
realChildren := getSemanticJsxChildren(node.Children().Nodes)
childIndex := slices.Index(realChildren, child)
childFieldType := c.getTypeOfPropertyOfContextualType(attributesType, jsxChildrenPropertyName)
if childFieldType == nil {
return nil
}
if len(realChildren) == 1 {
return childFieldType
}
return c.mapTypeEx(childFieldType, func(t *Type) *Type {
if c.isArrayLikeType(t) {
return c.getIndexedAccessType(t, c.getNumberLiteralType(jsnum.Number(childIndex)))
}
return t
}, true /*noReductions*/)
}
func (c *Checker) discriminateContextualTypeByJSXAttributes(node *ast.Node, contextualType *Type) *Type {
key := DiscriminatedContextualTypeKey{nodeId: ast.GetNodeId(node), typeId: contextualType.id}
if discriminated := c.discriminatedContextualTypes[key]; discriminated != nil {
return discriminated
}
jsxChildrenPropertyName := c.getJsxElementChildrenPropertyName(c.getJsxNamespaceAt(node))
discriminantProperties := core.Filter(node.AsJsxAttributes().Properties.Nodes, func(p *ast.Node) bool {
symbol := p.Symbol()
if symbol == nil || !ast.IsJsxAttribute(p) {
return false
}
initializer := p.Initializer()
return (initializer == nil || c.isPossiblyDiscriminantValue(initializer)) && c.isDiscriminantProperty(contextualType, symbol.Name)
})
discriminantMembers := core.Filter(c.getPropertiesOfType(contextualType), func(s *ast.Symbol) bool {
if s.Flags&ast.SymbolFlagsOptional == 0 || node.Symbol() == nil || len(node.Symbol().Members) == 0 {
return false
}
element := node.Parent.Parent
if s.Name == jsxChildrenPropertyName && ast.IsJsxElement(element) && len(getSemanticJsxChildren(element.Children().Nodes)) != 0 {
return false
}
return node.Symbol().Members[s.Name] == nil && c.isDiscriminantProperty(contextualType, s.Name)
})
discriminator := &ObjectLiteralDiscriminator{c: c, props: discriminantProperties, members: discriminantMembers}
discriminated := c.discriminateTypeByDiscriminableItems(contextualType, discriminator)
c.discriminatedContextualTypes[key] = discriminated
return discriminated
}
func (c *Checker) elaborateJsxComponents(node *ast.Node, source *Type, target *Type, relation *Relation, diagnosticOutput *[]*ast.Diagnostic) bool {
reportedError := false
for _, prop := range node.AsJsxAttributes().Properties.Nodes {
if !ast.IsJsxSpreadAttribute(prop) && !isHyphenatedJsxName(prop.Name().Text()) {
nameType := c.getStringLiteralType(prop.Name().Text())
if nameType != nil && nameType.flags&TypeFlagsNever == 0 {
reportedError = c.elaborateElement(source, target, relation, prop.Name(), prop.Initializer(), nameType, nil, diagnosticOutput) || reportedError
}
}
}
if ast.IsJsxOpeningElement(node.Parent) && ast.IsJsxElement(node.Parent.Parent) {
// containingElement := node.Parent.Parent
// childrenPropName := c.getJsxElementChildrenPropertyName(c.getJsxNamespaceAt(node))
// if childrenPropName == ast.InternalSymbolNameMissing {
// childrenPropName = "children"
// }
// childrenNameType := c.getStringLiteralType(childrenPropName)
// childrenTargetType := c.getIndexedAccessType(target, childrenNameType)
// validChildren := getSemanticJsxChildren(containingElement.Children().Nodes)
// if len(validChildren) == 0 {
// return reportedError
// }
// moreThanOneRealChildren := len(validChildren) > 1
// var arrayLikeTargetParts *Type
// var nonArrayLikeTargetParts *Type
// iterableType := c.getGlobalIterableType()
// if iterableType != c.emptyGenericType {
// anyIterable := c.createIterableType(c.anyType)
// arrayLikeTargetParts = c.filterType(childrenTargetType, func(t *Type) bool {
// return c.isTypeAssignableTo(t, anyIterable)
// })
// nonArrayLikeTargetParts = c.filterType(childrenTargetType, func(t *Type) bool {
// return !c.isTypeAssignableTo(t, anyIterable)
// })
// } else {
// arrayLikeTargetParts = c.filterType(childrenTargetType, c.isArrayOrTupleLikeType)
// nonArrayLikeTargetParts = c.filterType(childrenTargetType, func(t *Type) bool {
// return !c.isArrayOrTupleLikeType(t)
// })
// }
// if moreThanOneRealChildren {
// if arrayLikeTargetParts != c.neverType {
// realSource := c.createTupleType(c.checkJsxChildren(containingElement, CheckModeNormal))
// children := c.generateJsxChildren(containingElement, getInvalidTextualChildDiagnostic)
// result = c.elaborateIterableOrArrayLikeTargetElementwise(children, realSource, arrayLikeTargetParts, relation, containingMessageChain, errorOutputContainer) || result
// } else if !c.isTypeRelatedTo(c.getIndexedAccessType(source, childrenNameType), childrenTargetType, relation) {
// // arity mismatch
// result = true
// diag := c.error(containingElement.OpeningElement.TagName, Diagnostics.This_JSX_tag_s_0_prop_expects_a_single_child_of_type_1_but_multiple_children_were_provided, childrenPropName, c.typeToString(childrenTargetType))
// if errorOutputContainer != nil && errorOutputContainer.skipLogging {
// (errorOutputContainer.errors || ( /* TODO(TS-TO-GO) EqualsToken BinaryExpression: errorOutputContainer.errors = [] */ TODO)).push(diag)
// }
// }
// } else {
// if nonArrayLikeTargetParts != c.neverType {
// child := validChildren[0]
// elem := c.getElaborationElementForJsxChild(child, childrenNameType, getInvalidTextualChildDiagnostic)
// if elem != nil {
// result = c.elaborateElementwise((func /* generator */ () /* TODO(TS-TO-GO) inferred type Generator<{ errorNode: JsxExpression; innerExpression: Expression | undefined; nameType: LiteralType; errorMessage?: undefined; } | { errorNode: JsxText; innerExpression: undefined; nameType: LiteralType; errorMessage: DiagnosticMessage; } | { errorNode: JsxElement | JsxSelfClosingElement | JsxFragment; innerExpression: JsxElement | JsxSelfClosingElement | JsxFragment; nameType: LiteralType; errorMessage?: undefined; }, void, any> */ any {
// yield(elem)
// })(), source, target, relation, containingMessageChain, errorOutputContainer) || result
// }
// } else if !c.isTypeRelatedTo(c.getIndexedAccessType(source, childrenNameType), childrenTargetType, relation) {
// // arity mismatch
// result = true
// diag := c.error(containingElement.OpeningElement.TagName, Diagnostics.This_JSX_tag_s_0_prop_expects_type_1_which_requires_multiple_children_but_only_a_single_child_was_provided, childrenPropName, c.typeToString(childrenTargetType))
// if errorOutputContainer != nil && errorOutputContainer.skipLogging {
// (errorOutputContainer.errors || ( /* TODO(TS-TO-GO) EqualsToken BinaryExpression: errorOutputContainer.errors = [] */ TODO)).push(diag)
// }
// }
// }
}
return reportedError
}
func (c *Checker) getSuggestedSymbolForNonexistentJSXAttribute(name string, containingType *Type) *ast.Symbol {
properties := c.getPropertiesOfType(containingType)
var jsxSpecific *ast.Symbol
switch name {
case "for":
jsxSpecific = core.Find(properties, func(x *ast.Symbol) bool { return ast.SymbolName(x) == "htmlFor" })
case "class":
jsxSpecific = core.Find(properties, func(x *ast.Symbol) bool { return ast.SymbolName(x) == "className" })
}
if jsxSpecific != nil {
return jsxSpecific
}
return c.getSpellingSuggestionForName(name, properties, ast.SymbolFlagsValue)
}
func (c *Checker) resolveJsxOpeningLikeElement(node *ast.Node, candidatesOutArray *[]*Signature, checkMode CheckMode) *Signature {
if isJsxIntrinsicTagName(node.TagName()) {
result := c.getIntrinsicAttributesTypeFromJsxOpeningLikeElement(node)
fakeSignature := c.createSignatureForJSXIntrinsic(node, result)
c.checkTypeAssignableToAndOptionallyElaborate(c.checkExpressionWithContextualType(node.Attributes(), c.getEffectiveFirstArgumentForJsxSignature(fakeSignature, node), nil /*inferenceContext*/, CheckModeNormal), result, node.TagName(), node.Attributes(), nil, nil)
typeArguments := node.TypeArguments()
if len(typeArguments) != 0 {
c.checkSourceElements(typeArguments)
c.diagnostics.Add(ast.NewDiagnostic(ast.GetSourceFileOfNode(node), node.TypeArgumentList().Loc, diagnostics.Expected_0_type_arguments_but_got_1, 0, len(typeArguments)))
}
return fakeSignature
}
exprTypes := c.checkExpression(node.TagName())
apparentType := c.getApparentType(exprTypes)
if c.isErrorType(apparentType) {
return c.resolveErrorCall(node)
}
signatures := c.getUninstantiatedJsxSignaturesOfType(exprTypes, node)
if c.isUntypedFunctionCall(exprTypes, apparentType, len(signatures), 0 /*constructSignatures*/) {
return c.resolveUntypedCall(node)
}
if len(signatures) == 0 {
// We found no signatures at all, which is an error
c.error(node.TagName(), diagnostics.JSX_element_type_0_does_not_have_any_construct_or_call_signatures, scanner.GetTextOfNode(node.TagName()))
return c.resolveErrorCall(node)
}
return c.resolveCall(node, signatures, candidatesOutArray, checkMode, SignatureFlagsNone, nil)
}
// Check if the given signature can possibly be a signature called by the JSX opening-like element.
// @param node a JSX opening-like element we are trying to figure its call signature
// @param signature a candidate signature we are trying whether it is a call signature
// @param relation a relationship to check parameter and argument type
func (c *Checker) checkApplicableSignatureForJsxOpeningLikeElement(node *ast.Node, signature *Signature, relation *Relation, checkMode CheckMode, reportErrors bool, diagnosticOutput *[]*ast.Diagnostic) bool {
// Stateless function components can have maximum of three arguments: "props", "context", and "updater".
// However "context" and "updater" are implicit and can't be specify by users. Only the first parameter, props,
// can be specified by users through attributes property.
paramType := c.getEffectiveFirstArgumentForJsxSignature(signature, node)
attributesType := c.checkExpressionWithContextualType(node.Attributes(), paramType, nil /*inferenceContext*/, checkMode)
var checkAttributesType *Type
checkTagNameDoesNotExpectTooManyArguments := func() bool {
if c.getJsxNamespaceContainerForImplicitImport(node) != nil {
return true // factory is implicitly jsx/jsxdev - assume it fits the bill, since we don't strongly look for the jsx/jsxs/jsxDEV factory APIs anywhere else (at least not yet)
}
var tagType *Type
if (ast.IsJsxOpeningElement(node) || ast.IsJsxSelfClosingElement(node)) && !(isJsxIntrinsicTagName(node.TagName()) || ast.IsJsxNamespacedName(node.TagName())) {
tagType = c.checkExpression(node.TagName())
}
if tagType == nil {
return true
}
tagCallSignatures := c.getSignaturesOfType(tagType, SignatureKindCall)
if len(tagCallSignatures) == 0 {
return true
}
factory := c.getJsxFactoryEntity(node)
if factory == nil {
return true
}
factorySymbol := c.resolveEntityName(factory, ast.SymbolFlagsValue, true /*ignoreErrors*/, false /*dontResolveAlias*/, node)
if factorySymbol == nil {
return true
}
factoryType := c.getTypeOfSymbol(factorySymbol)
callSignatures := c.getSignaturesOfType(factoryType, SignatureKindCall)
if len(callSignatures) == 0 {
return true
}
hasFirstParamSignatures := false
maxParamCount := 0
// Check that _some_ first parameter expects a FC-like thing, and that some overload of the SFC expects an acceptable number of arguments
for _, sig := range callSignatures {
firstparam := c.getTypeAtPosition(sig, 0)
signaturesOfParam := c.getSignaturesOfType(firstparam, SignatureKindCall)
if len(signaturesOfParam) == 0 {
continue
}
for _, paramSig := range signaturesOfParam {
hasFirstParamSignatures = true
if c.hasEffectiveRestParameter(paramSig) {
return true // some signature has a rest param, so function components can have an arbitrary number of arguments
}
paramCount := c.getParameterCount(paramSig)
if paramCount > maxParamCount {
maxParamCount = paramCount
}
}
}
if !hasFirstParamSignatures {
// Not a single signature had a first parameter which expected a signature - for back compat, and
// to guard against generic factories which won't have signatures directly, do not error
return true
}
absoluteMinArgCount := math.MaxInt
for _, tagSig := range tagCallSignatures {
tagRequiredArgCount := c.getMinArgumentCount(tagSig)
if tagRequiredArgCount < absoluteMinArgCount {
absoluteMinArgCount = tagRequiredArgCount
}
}
if absoluteMinArgCount <= maxParamCount {
return true // some signature accepts the number of arguments the function component provides
}
if reportErrors {
diag := NewDiagnosticForNode(node.TagName(), diagnostics.Tag_0_expects_at_least_1_arguments_but_the_JSX_factory_2_provides_at_most_3, entityNameToString(node.TagName()), absoluteMinArgCount, entityNameToString(factory), maxParamCount)
tagNameSymbol := c.getSymbolAtLocation(node.TagName(), false)
if tagNameSymbol != nil && tagNameSymbol.ValueDeclaration != nil {
diag.AddRelatedInfo(NewDiagnosticForNode(tagNameSymbol.ValueDeclaration, diagnostics.X_0_is_declared_here, entityNameToString(node.TagName())))
}
c.reportDiagnostic(diag, diagnosticOutput)
}
return false
}
if checkMode&CheckModeSkipContextSensitive != 0 {
checkAttributesType = c.getRegularTypeOfObjectLiteral(attributesType)
} else {
checkAttributesType = attributesType
}
if !checkTagNameDoesNotExpectTooManyArguments() {
return false
}
var errorNode *ast.Node
if reportErrors {
errorNode = node.TagName()
}
return c.checkTypeRelatedToAndOptionallyElaborate(checkAttributesType, paramType, relation, errorNode, node.Attributes(), nil, diagnosticOutput)
}
// Get attributes type of the JSX opening-like element. The result is from resolving "attributes" property of the opening-like element.
//
// @param openingLikeElement a JSX opening-like element
// @param filter a function to remove attributes that will not participate in checking whether attributes are assignable
// @return an anonymous type (similar to the one returned by checkObjectLiteral) in which its properties are attributes property.
// @remarks Because this function calls getSpreadType, it needs to use the same checks as checkObjectLiteral,
// which also calls getSpreadType.
func (c *Checker) createJsxAttributesTypeFromAttributesProperty(openingLikeElement *ast.Node, checkMode CheckMode) *Type {
attributes := openingLikeElement.Attributes()
contextualType := c.getContextualType(attributes, ContextFlagsNone)
var allAttributesTable ast.SymbolTable
if c.strictNullChecks {
allAttributesTable = make(ast.SymbolTable)
}
attributesTable := make(ast.SymbolTable)
spread := c.emptyJsxObjectType
var hasSpreadAnyType bool
var typeToIntersect *Type
var explicitlySpecifyChildrenAttribute bool
objectFlags := ObjectFlagsJsxAttributes
createJsxAttributesType := func() *Type {
objectFlags |= ObjectFlagsFreshLiteral
result := c.newAnonymousType(attributes.Symbol(), attributesTable, nil, nil, nil)
result.objectFlags |= objectFlags | ObjectFlagsObjectLiteral | ObjectFlagsContainsObjectOrArrayLiteral
return result
}
jsxChildrenPropertyName := c.getJsxElementChildrenPropertyName(c.getJsxNamespaceAt(openingLikeElement))
// Create anonymous type from given attributes symbol table.
// @param symbol a symbol of JsxAttributes containing attributes corresponding to attributesTable
// @param attributesTable a symbol table of attributes property
for _, attributeDecl := range attributes.AsJsxAttributes().Properties.Nodes {
member := attributeDecl.Symbol()
if ast.IsJsxAttribute(attributeDecl) {
exprType := c.checkJsxAttribute(attributeDecl, checkMode)
objectFlags |= exprType.objectFlags & ObjectFlagsPropagatingFlags
attributeSymbol := c.newSymbol(ast.SymbolFlagsProperty|member.Flags, member.Name)
attributeSymbol.Declarations = member.Declarations
attributeSymbol.Parent = member.Parent
if member.ValueDeclaration != nil {
attributeSymbol.ValueDeclaration = member.ValueDeclaration
}
links := c.valueSymbolLinks.Get(attributeSymbol)
links.resolvedType = exprType
links.target = member
attributesTable[attributeSymbol.Name] = attributeSymbol
if allAttributesTable != nil {
allAttributesTable[attributeSymbol.Name] = attributeSymbol
}
if attributeDecl.Name().Text() == jsxChildrenPropertyName {
explicitlySpecifyChildrenAttribute = true
}
if contextualType != nil {
prop := c.getPropertyOfType(contextualType, member.Name)
if prop != nil && prop.Declarations != nil && c.isDeprecatedSymbol(prop) && ast.IsIdentifier(attributeDecl.Name()) {
c.addDeprecatedSuggestion(attributeDecl.Name(), prop.Declarations, attributeDecl.Name().Text())
}
}
if contextualType != nil && checkMode&CheckModeInferential != 0 && checkMode&CheckModeSkipContextSensitive == 0 && c.isContextSensitive(attributeDecl) {
inferenceContext := c.getInferenceContext(attributes)
// Debug.assert(inferenceContext)
// In CheckMode.Inferential we should always have an inference context
inferenceNode := attributeDecl.Initializer().Expression()
c.addIntraExpressionInferenceSite(inferenceContext, inferenceNode, exprType)
}
} else {
// Debug.assert(attributeDecl.Kind == ast.KindJsxSpreadAttribute)
if len(attributesTable) != 0 {
spread = c.getSpreadType(spread, createJsxAttributesType(), attributes.Symbol(), objectFlags, false /*readonly*/)
attributesTable = make(ast.SymbolTable)
}
exprType := c.getReducedType(c.checkExpressionEx(attributeDecl.Expression(), checkMode&CheckModeInferential))
if IsTypeAny(exprType) {
hasSpreadAnyType = true
}
if c.isValidSpreadType(exprType) {
spread = c.getSpreadType(spread, exprType, attributes.Symbol(), objectFlags, false /*readonly*/)
if allAttributesTable != nil {
c.checkSpreadPropOverrides(exprType, allAttributesTable, attributeDecl)
}
} else {
c.error(attributeDecl.Expression(), diagnostics.Spread_types_may_only_be_created_from_object_types)
if typeToIntersect != nil {
typeToIntersect = c.getIntersectionType([]*Type{typeToIntersect, exprType})
} else {
typeToIntersect = exprType
}
}
}
}
if !hasSpreadAnyType {
if len(attributesTable) != 0 {
spread = c.getSpreadType(spread, createJsxAttributesType(), attributes.Symbol(), objectFlags, false /*readonly*/)
}
}
// Handle children attribute
var parent *ast.Node
if ast.IsJsxElement(openingLikeElement.Parent) {
parent = openingLikeElement.Parent
}
// We have to check that openingElement of the parent is the one we are visiting as this may not be true for selfClosingElement
if parent != nil && parent.AsJsxElement().OpeningElement == openingLikeElement && len(getSemanticJsxChildren(parent.AsJsxElement().Children.Nodes)) != 0 {
childTypes := c.checkJsxChildren(parent, checkMode)
if !hasSpreadAnyType && jsxChildrenPropertyName != ast.InternalSymbolNameMissing && jsxChildrenPropertyName != "" {
// Error if there is a attribute named "children" explicitly specified and children element.
// This is because children element will overwrite the value from attributes.
// Note: we will not warn "children" attribute overwritten if "children" attribute is specified in object spread.
if explicitlySpecifyChildrenAttribute {
c.error(attributes, diagnostics.X_0_are_specified_twice_The_attribute_named_0_will_be_overwritten, jsxChildrenPropertyName)
}
var childrenContextualType *Type
if contextualType := c.getApparentTypeOfContextualType(openingLikeElement.Attributes(), ContextFlagsNone); contextualType != nil {
childrenContextualType = c.getTypeOfPropertyOfContextualType(contextualType, jsxChildrenPropertyName)
}
// If there are children in the body of JSX element, create dummy attribute "children" with the union of children types so that it will pass the attribute checking process
childrenPropSymbol := c.newSymbol(ast.SymbolFlagsProperty, jsxChildrenPropertyName)
links := c.valueSymbolLinks.Get(childrenPropSymbol)
switch {
case len(childTypes) == 1:
links.resolvedType = childTypes[0]
case childrenContextualType != nil && someType(childrenContextualType, c.isTupleLikeType):
links.resolvedType = c.createTupleType(childTypes)
default:
links.resolvedType = c.createArrayType(c.getUnionType(childTypes))
}
// Fake up a property declaration for the children
// childrenPropSymbol.ValueDeclaration = c.factory.NewPropertySignatureDeclaration(nil, jsxChildrenPropertyName, nil /*postfixToken*/, nil /*type*/, nil /*initializer*/)
// setParent(childrenPropSymbol.ValueDeclaration, attributes)
// childrenPropSymbol.ValueDeclaration.Symbol = childrenPropSymbol
childPropMap := make(ast.SymbolTable)
childPropMap[jsxChildrenPropertyName] = childrenPropSymbol
spread = c.getSpreadType(spread, c.newAnonymousType(attributes.Symbol(), childPropMap, nil, nil, nil), attributes.Symbol(), objectFlags, false /*readonly*/)
}
}
if hasSpreadAnyType {
return c.anyType
}
if typeToIntersect != nil {
if spread != c.emptyJsxObjectType {
return c.getIntersectionType([]*Type{typeToIntersect, spread})
}
return typeToIntersect
}
if spread == c.emptyJsxObjectType {
return createJsxAttributesType()
}
return spread
}
func getSemanticJsxChildren(children []*ast.JsxChild) []*ast.JsxChild {
return core.Filter(children, func(i *ast.JsxChild) bool {
switch i.Kind {
case ast.KindJsxExpression:
return i.Expression() != nil
case ast.KindJsxText:
return !i.AsJsxText().ContainsOnlyTriviaWhiteSpaces
default:
return true
}
})
}
func (c *Checker) checkJsxAttribute(node *ast.Node, checkMode CheckMode) *Type {
if node.Initializer() != nil {
return c.checkExpressionForMutableLocation(node.Initializer(), checkMode)
}
// <Elem attr /> is sugar for <Elem attr={true} />
return c.trueType
}
func (c *Checker) checkJsxChildren(node *ast.Node, checkMode CheckMode) []*Type {
var childTypes []*Type
for _, child := range node.Children().Nodes {
// In React, JSX text that contains only whitespaces will be ignored so we don't want to type-check that
// because then type of children property will have constituent of string type.
if ast.IsJsxText(child) {
if !child.AsJsxText().ContainsOnlyTriviaWhiteSpaces {
childTypes = append(childTypes, c.stringType)
}
} else if ast.IsJsxExpression(child) && child.Expression() == nil {
// empty jsx expressions don't *really* count as present children
continue
} else {
childTypes = append(childTypes, c.checkExpressionForMutableLocation(child, checkMode))
}
}
return childTypes
}
func (c *Checker) getUninstantiatedJsxSignaturesOfType(elementType *Type, caller *ast.Node) []*Signature {
if elementType.flags&TypeFlagsString != 0 {
return []*Signature{c.anySignature}
}
if elementType.flags&TypeFlagsStringLiteral != 0 {
intrinsicType := c.getIntrinsicAttributesTypeFromStringLiteralType(elementType, caller)
if intrinsicType == nil {
c.error(caller, diagnostics.Property_0_does_not_exist_on_type_1, getStringLiteralValue(elementType), "JSX."+JsxNames.IntrinsicElements)
return nil
}
fakeSignature := c.createSignatureForJSXIntrinsic(caller, intrinsicType)
return []*Signature{fakeSignature}
}
apparentElemType := c.getApparentType(elementType)
// Resolve the signatures, preferring constructor
signatures := c.getSignaturesOfType(apparentElemType, SignatureKindConstruct)
if len(signatures) == 0 {
// No construct signatures, try call signatures
signatures = c.getSignaturesOfType(apparentElemType, SignatureKindCall)
}
if len(signatures) == 0 && apparentElemType.flags&TypeFlagsUnion != 0 {
// If each member has some combination of new/call signatures; make a union signature list for those
signatures = c.getUnionSignatures(core.Map(apparentElemType.Types(), func(t *Type) []*Signature {
return c.getUninstantiatedJsxSignaturesOfType(t, caller)
}))
}
return signatures
}
func (c *Checker) getEffectiveFirstArgumentForJsxSignature(signature *Signature, node *ast.Node) *Type {
if c.getJsxReferenceKind(node) != JsxReferenceKindComponent {
return c.getJsxPropsTypeFromCallSignature(signature, node)
}
return c.getJsxPropsTypeFromClassType(signature, node)
}
func (c *Checker) getJsxPropsTypeFromCallSignature(sig *Signature, context *ast.Node) *Type {
propsType := c.getTypeOfFirstParameterOfSignatureWithFallback(sig, c.unknownType)
propsType = c.getJsxManagedAttributesFromLocatedAttributes(context, c.getJsxNamespaceAt(context), propsType)
intrinsicAttribs := c.getJsxType(JsxNames.IntrinsicAttributes, context)
if !c.isErrorType(intrinsicAttribs) {
propsType = c.intersectTypes(intrinsicAttribs, propsType)
}
return propsType
}
func (c *Checker) getJsxPropsTypeFromClassType(sig *Signature, context *ast.Node) *Type {
ns := c.getJsxNamespaceAt(context)
forcedLookupLocation := c.getJsxElementPropertiesName(ns)
var attributesType *Type
switch forcedLookupLocation {
case ast.InternalSymbolNameMissing:
attributesType = c.getTypeOfFirstParameterOfSignatureWithFallback(sig, c.unknownType)
case "":
attributesType = c.getReturnTypeOfSignature(sig)
default:
attributesType = c.getJsxPropsTypeForSignatureFromMember(sig, forcedLookupLocation)
if attributesType == nil && len(context.Attributes().AsJsxAttributes().Properties.Nodes) != 0 {
// There is no property named 'props' on this instance type
c.error(context, diagnostics.JSX_element_class_does_not_support_attributes_because_it_does_not_have_a_0_property, forcedLookupLocation)
}
}
if attributesType == nil {
return c.unknownType
}
attributesType = c.getJsxManagedAttributesFromLocatedAttributes(context, ns, attributesType)
if IsTypeAny(attributesType) {
// Props is of type 'any' or unknown
return attributesType
}
// Normal case -- add in IntrinsicClassElements<T> and IntrinsicElements
apparentAttributesType := attributesType
intrinsicClassAttribs := c.getJsxType(JsxNames.IntrinsicClassAttributes, context)
if !c.isErrorType(intrinsicClassAttribs) {
typeParams := c.getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(intrinsicClassAttribs.symbol)
hostClassType := c.getReturnTypeOfSignature(sig)
var libraryManagedAttributeType *Type
if typeParams != nil {
// apply JSX.IntrinsicClassElements<hostClassType, ...>
inferredArgs := c.fillMissingTypeArguments([]*Type{hostClassType}, typeParams, c.getMinTypeArgumentCount(typeParams))
libraryManagedAttributeType = c.instantiateType(intrinsicClassAttribs, newTypeMapper(typeParams, inferredArgs))
} else {
libraryManagedAttributeType = intrinsicClassAttribs
}
apparentAttributesType = c.intersectTypes(libraryManagedAttributeType, apparentAttributesType)
}
intrinsicAttribs := c.getJsxType(JsxNames.IntrinsicAttributes, context)
if !c.isErrorType(intrinsicAttribs) {
apparentAttributesType = c.intersectTypes(intrinsicAttribs, apparentAttributesType)
}
return apparentAttributesType
}
func (c *Checker) getJsxPropsTypeForSignatureFromMember(sig *Signature, forcedLookupLocation string) *Type {
if sig.composite != nil {
// JSX Elements using the legacy `props`-field based lookup (eg, react class components) need to treat the `props` member as an input
// instead of an output position when resolving the signature. We need to go back to the input signatures of the composite signature,
// get the type of `props` on each return type individually, and then _intersect them_, rather than union them (as would normally occur
// for a union signature). It's an unfortunate quirk of looking in the output of the signature for the type we want to use for the input.
// The default behavior of `getTypeOfFirstParameterOfSignatureWithFallback` when no `props` member name is defined is much more sane.
var results []*Type
for _, signature := range sig.composite.signatures {
instance := c.getReturnTypeOfSignature(signature)
if IsTypeAny(instance) {
return instance
}
propType := c.getTypeOfPropertyOfType(instance, forcedLookupLocation)
if propType == nil {
return nil
}
results = append(results, propType)
}
return c.getIntersectionType(results)
// Same result for both union and intersection signatures
}
instanceType := c.getReturnTypeOfSignature(sig)
if IsTypeAny(instanceType) {
return instanceType
}
return c.getTypeOfPropertyOfType(instanceType, forcedLookupLocation)
}
func (c *Checker) getJsxManagedAttributesFromLocatedAttributes(context *ast.Node, ns *ast.Symbol, attributesType *Type) *Type {
managedSym := c.getJsxLibraryManagedAttributes(ns)
if managedSym != nil {
ctorType := c.getStaticTypeOfReferencedJsxConstructor(context)
result := c.instantiateAliasOrInterfaceWithDefaults(managedSym, []*Type{ctorType, attributesType})
if result != nil {
return result
}
}
return attributesType
}
func (c *Checker) instantiateAliasOrInterfaceWithDefaults(managedSym *ast.Symbol, typeArguments []*Type) *Type {
declaredManagedType := c.getDeclaredTypeOfSymbol(managedSym)
// fetches interface type, or initializes symbol links type parmaeters
if managedSym.Flags&ast.SymbolFlagsTypeAlias != 0 {
params := c.typeAliasLinks.Get(managedSym).typeParameters
if len(params) >= len(typeArguments) {
args := c.fillMissingTypeArguments(typeArguments, params, len(typeArguments))
if len(args) == 0 {
return declaredManagedType
}
return c.getTypeAliasInstantiation(managedSym, args, nil)
}
}
if len(declaredManagedType.AsInterfaceType().TypeParameters()) >= len(typeArguments) {
args := c.fillMissingTypeArguments(typeArguments, declaredManagedType.AsInterfaceType().TypeParameters(), len(typeArguments))
return c.createTypeReference(declaredManagedType, args)
}
return nil
}
func (c *Checker) getJsxLibraryManagedAttributes(jsxNamespace *ast.Symbol) *ast.Symbol {
if jsxNamespace != nil {
return c.getSymbol(jsxNamespace.Exports, JsxNames.LibraryManagedAttributes, ast.SymbolFlagsType)
}
return nil
}
func (c *Checker) getJsxElementTypeSymbol(jsxNamespace *ast.Symbol) *ast.Symbol {
// JSX.ElementType [symbol]
if jsxNamespace != nil {
return c.getSymbol(jsxNamespace.Exports, JsxNames.ElementType, ast.SymbolFlagsType)
}
return nil
}
// e.g. "props" for React.d.ts,
// or InternalSymbolNameMissing if ElementAttributesProperty doesn't exist (which means all
//
// non-intrinsic elements' attributes type is 'any'),
//
// or "" if it has 0 properties (which means every
//
// non-intrinsic elements' attributes type is the element instance type)
func (c *Checker) getJsxElementPropertiesName(jsxNamespace *ast.Symbol) string {
return c.getNameFromJsxElementAttributesContainer(JsxNames.ElementAttributesPropertyNameContainer, jsxNamespace)
}
func (c *Checker) getJsxElementChildrenPropertyName(jsxNamespace *ast.Symbol) string {
return c.getNameFromJsxElementAttributesContainer(JsxNames.ElementChildrenAttributeNameContainer, jsxNamespace)
}
// Look into JSX namespace and then look for container with matching name as nameOfAttribPropContainer.
// Get a single property from that container if existed. Report an error if there are more than one property.
//
// @param nameOfAttribPropContainer a string of value JsxNames.ElementAttributesPropertyNameContainer or JsxNames.ElementChildrenAttributeNameContainer
//
// if other string is given or the container doesn't exist, return undefined.
func (c *Checker) getNameFromJsxElementAttributesContainer(nameOfAttribPropContainer string, jsxNamespace *ast.Symbol) string {
// JSX.ElementAttributesProperty | JSX.ElementChildrenAttribute [symbol]
if jsxNamespace != nil {
jsxElementAttribPropInterfaceSym := c.getSymbol(jsxNamespace.Exports, nameOfAttribPropContainer, ast.SymbolFlagsType)
if jsxElementAttribPropInterfaceSym != nil {
jsxElementAttribPropInterfaceType := c.getDeclaredTypeOfSymbol(jsxElementAttribPropInterfaceSym)
propertiesOfJsxElementAttribPropInterface := c.getPropertiesOfType(jsxElementAttribPropInterfaceType)
// Element Attributes has zero properties, so the element attributes type will be the class instance type
if len(propertiesOfJsxElementAttribPropInterface) == 0 {
return ""
}
if len(propertiesOfJsxElementAttribPropInterface) == 1 {
return propertiesOfJsxElementAttribPropInterface[0].Name
}
if len(propertiesOfJsxElementAttribPropInterface) > 1 && len(jsxElementAttribPropInterfaceSym.Declarations) != 0 {
// More than one property on ElementAttributesProperty is an error
c.error(jsxElementAttribPropInterfaceSym.Declarations[0], diagnostics.The_global_type_JSX_0_may_not_have_more_than_one_property, nameOfAttribPropContainer)
}
}
}
return ast.InternalSymbolNameMissing
}
func (c *Checker) getStaticTypeOfReferencedJsxConstructor(context *ast.Node) *Type {
if isJsxIntrinsicTagName(context.TagName()) {
result := c.getIntrinsicAttributesTypeFromJsxOpeningLikeElement(context)
fakeSignature := c.createSignatureForJSXIntrinsic(context, result)
return c.getOrCreateTypeFromSignature(fakeSignature, nil)
}
tagType := c.checkExpressionCached(context.TagName())
if tagType.flags&TypeFlagsStringLiteral != 0 {
result := c.getIntrinsicAttributesTypeFromStringLiteralType(tagType, context)
if result == nil {
return c.errorType
}
fakeSignature := c.createSignatureForJSXIntrinsic(context, result)
return c.getOrCreateTypeFromSignature(fakeSignature, nil)
}
return tagType
}
func (c *Checker) getIntrinsicAttributesTypeFromStringLiteralType(t *Type, location *ast.Node) *Type {
// If the elemType is a stringLiteral type, we can then provide a check to make sure that the string literal type is one of the Jsx intrinsic element type
// For example:
// var CustomTag: "h1" = "h1";
// <CustomTag> Hello World </CustomTag>
intrinsicElementsType := c.getJsxType(JsxNames.IntrinsicElements, location)
if !c.isErrorType(intrinsicElementsType) {
stringLiteralTypeName := getStringLiteralValue(t)
intrinsicProp := c.getPropertyOfType(intrinsicElementsType, stringLiteralTypeName)
if intrinsicProp != nil {
return c.getTypeOfSymbol(intrinsicProp)
}
indexSignatureType := c.getIndexTypeOfType(intrinsicElementsType, c.stringType)
if indexSignatureType != nil {
return indexSignatureType
}
return nil
}
// If we need to report an error, we already done so here. So just return any to prevent any more error downstream
return c.anyType
}
func (c *Checker) getJsxReferenceKind(node *ast.Node) JsxReferenceKind {
if isJsxIntrinsicTagName(node.TagName()) {
return JsxReferenceKindMixed
}
tagType := c.getApparentType(c.checkExpression(node.TagName()))
if len(c.getSignaturesOfType(tagType, SignatureKindConstruct)) != 0 {
return JsxReferenceKindComponent
}
if len(c.getSignaturesOfType(tagType, SignatureKindCall)) != 0 {
return JsxReferenceKindFunction
}
return JsxReferenceKindMixed
}
func (c *Checker) createSignatureForJSXIntrinsic(node *ast.Node, result *Type) *Signature {
elementType := c.errorType
if namespace := c.getJsxNamespaceAt(node); namespace != nil {
if typeSymbol := c.getSymbol(c.getExportsOfSymbol(namespace), JsxNames.Element, ast.SymbolFlagsType); typeSymbol != nil {
elementType = c.getDeclaredTypeOfSymbol(typeSymbol)
}
}
// returnNode := typeSymbol && c.nodeBuilder.symbolToEntityName(typeSymbol, ast.SymbolFlagsType, node)
// declaration := factory.createFunctionTypeNode(nil, []ParameterDeclaration{factory.createParameterDeclaration(nil, nil /*dotDotDotToken*/, "props", nil /*questionToken*/, c.nodeBuilder.typeToTypeNode(result, node))}, ifElse(returnNode != nil, factory.createTypeReferenceNode(returnNode, nil /*typeArguments*/), factory.createKeywordTypeNode(ast.KindAnyKeyword)))
parameterSymbol := c.newSymbol(ast.SymbolFlagsFunctionScopedVariable, "props")
c.valueSymbolLinks.Get(parameterSymbol).resolvedType = result
return c.newSignature(SignatureFlagsNone, nil, nil, nil, []*ast.Symbol{parameterSymbol}, elementType, nil, 1)
}
// Get attributes type of the given intrinsic opening-like Jsx element by resolving the tag name.
// The function is intended to be called from a function which has checked that the opening element is an intrinsic element.
// @param node an intrinsic JSX opening-like element
func (c *Checker) getIntrinsicAttributesTypeFromJsxOpeningLikeElement(node *ast.Node) *Type {
// Debug.assert(c.isJsxIntrinsicTagName(node.TagName()))
links := c.jsxElementLinks.Get(node)
if links.resolvedJsxElementAttributesType != nil {
return links.resolvedJsxElementAttributesType
}
symbol := c.getIntrinsicTagSymbol(node)
if links.jsxFlags&JsxFlagsIntrinsicNamedElement != 0 {
links.resolvedJsxElementAttributesType = core.OrElse(c.getTypeOfSymbol(symbol), c.errorType)
return links.resolvedJsxElementAttributesType
}
if links.jsxFlags&JsxFlagsIntrinsicIndexedElement != 0 {
indexInfo := c.getApplicableIndexInfoForName(c.getJsxType(JsxNames.IntrinsicElements, node), node.TagName().Text())
if indexInfo != nil {
links.resolvedJsxElementAttributesType = indexInfo.valueType
return links.resolvedJsxElementAttributesType
}
}
links.resolvedJsxElementAttributesType = c.errorType
return links.resolvedJsxElementAttributesType
}
// Looks up an intrinsic tag name and returns a symbol that either points to an intrinsic
// property (in which case nodeLinks.jsxFlags will be IntrinsicNamedElement) or an intrinsic