Method getArrayMemberCallSignatures

internal/checker/checker.go:20976–20997

(t *Type)

}

func (c *Checker) getArrayMemberCallSignatures(t *Type) []*Signature {
	// Check if union is exclusively instantiations of a member of the global Array or ReadonlyArray type.
	var memberName string
	for i, t := range t.Types() {
		if t.objectFlags&ObjectFlagsInstantiated == 0 || t.symbol == nil || t.symbol.Parent == nil || !c.isArrayOrTupleSymbol(t.symbol.Parent) {
			return nil
		}
		if i == 0 {
			memberName = t.symbol.Name
		} else if memberName != t.symbol.Name {
			return nil
		}
	}
	// Transform the type from `(A[] | B[])["member"]` to `(A | B)[]["member"]` (since we pretend array is covariant anyway).
	arrayArg := c.mapType(t, func(t *Type) *Type {
		return t.Mapper().Map(core.IfElse(c.isReadonlyArraySymbol(t.symbol.Parent), c.globalReadonlyArrayType, c.globalArrayType).AsInterfaceType().TypeParameters()[0])
	})
	arrayType := c.createArrayTypeEx(arrayArg, someType(t, func(t *Type) bool {
		return c.isReadonlyArraySymbol(t.symbol.Parent)
	}))
	return c.getSignaturesOfType(c.getTypeOfPropertyOfType(arrayType, memberName), SignatureKindCall)
}

func (c *Checker) isArrayOrTupleSymbol(symbol *ast.Symbol) bool {
	if symbol == nil || c.globalArrayType.symbol == nil || c.globalReadonlyArrayType.symbol == nil {