ReSharper 2018.1 Help

Code Inspections in TypeScript

In TypeScript, ReSharper 2018.1 provides two kinds of code inspections: 138 inspections that detect errors such as broken syntax, unresolved symbols, compiler errors, etc. (you cannot configure or disable any of these inspections), and 48 proprietary code inspections, any of which you can disable or change its severity level.
These code inspections help you detect code issues in design time in all open files, and additionally they allow you to find code issues in specific scope.

Configurable TypeScript inspections are listed below, grouped by their categories.

Code Style (5 inspections)

Inspections in this category detect violations of code syntax styles. In contrast to most of other code inspections, these inspections can either detect the same code construct as a code issue or not depending on the corresponding code style rule configured on the Code Editing | [Language] | Code Style page of ReSharper options. You can also fix issues that these inspection detect, using code cleanup.
Inspection ID EditorConfig property Default severity
Element has implicit 'any' type ImplicitAnyTypeWarning resharper_implicit_any_type_warning_highlighting Warning
Non-compliant path style inside 'require' WrongRequireRelativePath resharper_wrong_require_relative_path_highlighting Hint
Non-compliant 'public' modifier or its absense WrongPublicModifierSpecification resharper_wrong_public_modifier_specification_highlighting Hint
Type of variable may be specified explicitly SpecifyVariableTypeExplicitly resharper_specify_variable_type_explicitly_highlighting Hint
Type specification is redundant, because variable type is contextually determined from the type of assigned value RedundantVariableTypeSpecification resharper_redundant_variable_type_specification_highlighting Hint

Common Practices and Code Improvements (4 inspections)

This category groups inspections that hunt for medium severity issues that mainly affect code readability.
Inspection ID EditorConfig property Default severity
Constructor of an abstract class can be made protected AbstractClassConstructorCanBeMadeProtected resharper_abstract_class_constructor_can_be_made_protected_highlighting Hint
Introducing variable will allow to apply type guard IntroduceVariableToApplyGuard resharper_introduce_variable_to_apply_guard_highlighting Hint
Private class field can be made readonly PrivateVariableCanBeMadeReadonly resharper_private_variable_can_be_made_readonly_highlighting Hint
String literal usage allows to create specialized overload CreateSpecializedOverload resharper_create_specialized_overload_highlighting Hint

Language Usage Opportunities (9 inspections)

This category includes code inspections, mostly with the suggestion severity level, which notify you when more advanced language constructs can be used. These inspections detect syntax of outdated language versions and suggest using features from more modern language versions. For most of the supported languages, language version can be detected automatically or set manually.
Inspection ID EditorConfig property Default severity
AMD module may be converted to external module AmdExternalModule resharper_amd_external_module_highlighting Suggestion
Class emulation may be converted to class Class resharper_class_highlighting Suggestion
CommonJs module may be converted to external module CommonJsExternalModule resharper_common_js_external_module_highlighting Suggestion
Function expression may be converted to lambda expression Lambda resharper_lambda_highlighting Suggestion
Immediately-invoked function expression may be converted to internal module InternalModule resharper_internal_module_highlighting Suggestion
Invocation of parent class may be converted to super call SuperCall resharper_super_call_highlighting Suggestion
Member assigned by a function may be converted to function member MethodSafeThis resharper_method_safe_this_highlighting Suggestion
Possible overloads may be inferred by function body OverloadSignatureInferring resharper_overload_signature_inferring_highlighting Hint
Use 'as' operator instead of type assertion UseAsInsteadOfTypeCast resharper_use_as_instead_of_type_cast_highlighting Hint

Potential Code Quality Issues (15 inspections)

This category includes inspections that detect critical issues (code smells), mostly with Error or Warning level. This category also includes inspections that ensure localization assistance.
Inspection ID EditorConfig property Default severity
Cannot resolve, probably symbol is located in inaccessible module TsResolvedFromInaccessibleModule resharper_ts_resolved_from_inaccessible_module_highlighting Error
Check 'amd-dependency' the same way as require() argument AmdDependencyPathProblem resharper_amd_dependency_path_problem_highlighting Disabled
Duplicate identifier DuplicateIdentifierError resharper_duplicate_identifier_error_highlighting Error
Empty return value for type-annotated function EmptyReturnValueForTypeAnnotatedFunction resharper_empty_return_value_for_type_annotated_function_highlighting Warning
Exported entity uses a private entity DeclarationVisibilityError resharper_declaration_visibility_error_highlighting Error
'Implicit any' inspection when NoImplicitAny is set ImplicitAnyError resharper_implicit_any_error_highlighting Error
More specific signature follows less specific MoreSpecificSignatureAfterLessSpecific resharper_more_specific_signature_after_less_specific_highlighting Warning
Overload is less specific than the main signature LessSpecificOverloadThanMainSignature resharper_less_specific_overload_than_main_signature_highlighting Warning
Parameter-property value assigned inside constructor won't be assigned to class property AssignedValueWontBeAssignedToCorrespondingField resharper_assigned_value_wont_be_assigned_to_corresponding_field_highlighting Warning
Suspicious 'instanceof' check SuspiciousInstanceofCheck resharper_suspicious_instanceof_check_highlighting Warning
Suspicious 'this' usage in context of local function inside class member SuspiciousThisUsage resharper_suspicious_this_usage_highlighting Warning
Suspicious 'typeof' check SuspiciousTypeofCheck resharper_suspicious_typeof_check_highlighting Warning
Type parameter hides type parameter declared in outer scope TypeParameterHidesTypeParamFromOuterScope resharper_type_parameter_hides_type_param_from_outer_scope_highlighting Warning
Use of possibly unassigned property in a static initializer UseOfPossiblyUnassignedProperty resharper_use_of_possibly_unassigned_property_highlighting Warning
Use of undeclared variable TsNotResolved resharper_ts_not_resolved_highlighting Error

Redundancies in Code (9 inspections)

Code inspections in this category look for redundancies and dead code, which affect code readability and style, and could be safely removed. Some code redundancies cannot be fixed automatically, and quick-fixes for them are performed in the interactive mode, requiring the user input. But the majority of the redundancies can be fixed without user interaction, using either fix in scope or code cleanup.
Inspection ID EditorConfig property Default severity
Comparison of boolean with boolean value is equivalent to value or negated value RedundantComparisonWithBoolean resharper_redundant_comparison_with_boolean_highlighting Warning
Double negation of boolean is redundant DoubleNegationOfBoolean resharper_double_negation_of_boolean_highlighting Warning
Duplicate reference comment is redundant DuplicateReferenceComment resharper_duplicate_reference_comment_highlighting Warning
Redundant parent type specification in extends/implements RedundantParentTypeDeclaration resharper_redundant_parent_type_declaration_highlighting Warning
Redundant qualifier RedundantQualifier resharper_redundant_qualifier_highlighting Warning
Reference comment creates cyclic dependency CyclicReferenceComment resharper_cyclic_reference_comment_highlighting Disabled
Ternary operator may be replaced by it's condition TernaryCanBeReplacedByItsCondition resharper_ternary_can_be_replaced_by_its_condition_highlighting Warning
Type cast is redundant: expression is always of provided type RedundantTypeCast resharper_redundant_type_cast_highlighting Warning
Type cast is redundant: expression is of a structurally compatible type RedundantTypeCastStructural resharper_redundant_type_cast_structural_highlighting Warning

Redundancies in Symbol Declarations (6 inspections)

This category includes code inspections, mostly with the warning severity level, which detect empty and unused symbol declarations.
Inspection ID EditorConfig property Default severity
Parameter doesn't participate in the main signature ParameterDoesntMakeAnySense resharper_parameter_doesnt_make_any_sense_highlighting Warning
Redundant empty constructor without parameters RedundantEmptyConstructor resharper_redundant_empty_constructor_highlighting Warning
Same item is imported twice with different names SameImportsWithDifferentName resharper_same_imports_with_different_name_highlighting Warning
Type guard definitely produces 'never' type for the variable TypeGuardProducesNeverType resharper_type_guard_produces_never_type_highlighting Warning
Type guard doesn't affect variable's type in any way TypeGuardDoesntAffectAnything resharper_type_guard_doesnt_affect_anything_highlighting Warning
Unused local import UnusedLocalImport resharper_unused_local_import_highlighting Warning
Last modified: 25 April 2018