Function checkExportAssignment

test/fixtures/snapshot/typescript.js:85476–85538

(node)

            }
        }
        function checkExportAssignment(node) {
            var illegalContextMessage = node.isExportEquals
                ? ts.Diagnostics.An_export_assignment_must_be_at_the_top_level_of_a_file_or_module_declaration
                : ts.Diagnostics.A_default_export_must_be_at_the_top_level_of_a_file_or_module_declaration;
            if (checkGrammarModuleElementContext(node, illegalContextMessage)) {
                // If we hit an export assignment in an illegal context, just bail out to avoid cascading errors.
                return;
            }
            var container = node.parent.kind === 305 /* SyntaxKind.SourceFile */ ? node.parent : node.parent.parent;
            if (container.kind === 261 /* SyntaxKind.ModuleDeclaration */ && !ts.isAmbientModule(container)) {
                if (node.isExportEquals) {
                    error(node, ts.Diagnostics.An_export_assignment_cannot_be_used_in_a_namespace);
                }
                else {
                    error(node, ts.Diagnostics.A_default_export_can_only_be_used_in_an_ECMAScript_style_module);
                }
                return;
            }
            // Grammar checking
            if (!checkGrammarDecoratorsAndModifiers(node) && ts.hasEffectiveModifiers(node)) {
                grammarErrorOnFirstToken(node, ts.Diagnostics.An_export_assignment_cannot_have_modifiers);
            }
            var typeAnnotationNode = ts.getEffectiveTypeAnnotationNode(node);
            if (typeAnnotationNode) {
                checkTypeAssignableTo(checkExpressionCached(node.expression), getTypeFromTypeNode(typeAnnotationNode), node.expression);
            }
            if (node.expression.kind === 79 /* SyntaxKind.Identifier */) {
                var id = node.expression;
                var sym = resolveEntityName(id, 67108863 /* SymbolFlags.All */, /*ignoreErrors*/ true, /*dontResolveAlias*/ true, node);
                if (sym) {
                    markAliasReferenced(sym, id);
                    // If not a value, we're interpreting the identifier as a type export, along the lines of (`export { Id as default }`)
                    var target = sym.flags & 2097152 /* SymbolFlags.Alias */ ? resolveAlias(sym) : sym;
                    if (target === unknownSymbol || target.flags & 111551 /* SymbolFlags.Value */) {
                        // However if it is a value, we need to check it's being used correctly
                        checkExpressionCached(node.expression);
                    }
                }
                else {
                    checkExpressionCached(node.expression); // doesn't resolve, check as expression to mark as error
                }
                if (ts.getEmitDeclarations(compilerOptions)) {
                    collectLinkedAliases(node.expression, /*setVisibility*/ true);
                }
            }
            else {
                checkExpressionCached(node.expression);
            }
            checkExternalModuleExports(container);
            if ((node.flags & 16777216 /* NodeFlags.Ambient */) && !ts.isEntityNameExpression(node.expression)) {
                grammarErrorOnNode(node.expression, ts.Diagnostics.The_expression_of_an_export_assignment_must_be_an_identifier_or_qualified_name_in_an_ambient_context);
            }
            if (node.isExportEquals && !(node.flags & 16777216 /* NodeFlags.Ambient */)) {
                if (moduleKind >= ts.ModuleKind.ES2015 && ts.getSourceFileOfNode(node).impliedNodeFormat !== ts.ModuleKind.CommonJS) {
                    // export assignment is not supported in es6 modules
                    grammarErrorOnNode(node, ts.Diagnostics.Export_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_export_default_or_another_module_format_instead);
                }
                else if (moduleKind === ts.ModuleKind.System) {