nl_tokens: An external module with an export = declaration may be referenced as an ES6 module provided the export = references a symbol that is at least declared as a module or a variable . The target of the export = may combine other declarations with the module or variable ( e . g . a class / module function / module interface / variable ) .
pl_tokens: function resolveESModuleSymbol ( moduleSymbol , moduleReferenceExpression ) { var symbol = resolveExternalModuleSymbol ( moduleSymbol ) ; if ( symbol && ! ( symbol . <mask> & ( 1536 /* Module */ | 3 /* Variable */ ) ) ) { error ( moduleReferenceExpression , ts . Diagnostics . Module_0_resolves_to_a_non_module_entity_and_cannot_be_imported_using_this_construct , symbolToString ( moduleSymbol ) ) ; symbol = undefined ; } return symbol ; }