const compilerOptions = host.getCompilerOptions();

const languageVersion = getEmitScriptTarget(compilerOptions);

const allowSyntheticDefaultImports = getAllowSyntheticDefaultImports(compilerOptions);

const strictNullChecks = getStrictOptionValue(compilerOptions, "strictNullChecks");

const strictFunctionTypes = getStrictOptionValue(compilerOptions, "strictFunctionTypes");

const declarationFile = getSourceFileOfNode(declaration);

const useFile = getSourceFileOfNode(usage);

if (declarationFile !== useFile) {

(!compilerOptions.outFile && !compilerOptions.out) ||

isInTypeQuery(usage) ||

declaration.flags & NodeFlags.Ambient) {

}

function checkImportMetaProperty(node: MetaProperty) {

error(node, Diagnostics.The_import_meta_meta_property_is_only_allowed_using_ESNext_for_the_target_and_module_compiler_options);

}

const file = getSourceFileOfNode(node);

function checkCollisionWithRequireExportsInGeneratedCode(node: Node, name: Identifier) {

// No need to check for require or exports for ES6 modules and later

return;

}

}

}

else {

// Import equals declaration is deprecated in es6 or above

grammarErrorOnNode(node, Diagnostics.Import_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_import_Asterisk_as_ns_from_mod_import_a_from_mod_import_d_from_mod_or_another_module_format_instead);

}

error(node.moduleSpecifier, Diagnostics.Module_0_uses_export_and_cannot_be_used_with_export_Asterisk, symbolToString(moduleSymbol));

}

checkExternalEmitHelpers(node, ExternalEmitHelpers.ExportStar);

}

}

}

if (node.isExportEquals && !(node.flags & NodeFlags.Ambient)) {

// export assignment is not supported in es6 modules

grammarErrorOnNode(node, Diagnostics.Export_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_export_default_or_another_module_format_instead);

}

// system modules does not support export assignment

grammarErrorOnNode(node, Diagnostics.Export_assignment_is_not_supported_when_module_flag_is_system);

}

}

function checkGrammarImportCallExpression(node: ImportCall): boolean {

return grammarErrorOnNode(node, Diagnostics.Dynamic_import_cannot_be_used_when_targeting_ECMAScript_2015_modules);

}