mirror of
https://github.com/danog/psalm.git
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321 lines
16 KiB
Markdown
321 lines
16 KiB
Markdown
# Error levels
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You can run Psalm in at different levels of strictness from 1 to 8.
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Level 1 is the most strict, level 8 is the most lenient.
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When no level is explicitly defined, psalm defaults to level 2.
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Some issues are [always treated as errors](#always-treated-as-errors). These are issues with a very low probability of false-positives.
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At [level 1](#errors-that-only-appear-at-level-1) all issues (except those emitted for opt-in features) that Psalm can find are treated as errors. Those issues include any situation where Psalm cannot infer the type of a given expression.
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At level 2 Psalm ignores those `Mixed*` issues, but treats most other issues as errors.
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At level 3 Psalm starts to be a little more lenient. For example Psalm allows missing param types, return types and property types.
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At level 4 Psalm ignores issues for _possible_ problems. These are more likely to be false positives – where the application code may guarantee behaviour that Psalm isn't able to infer.
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Level 5 and above allows a more non-verifiable code, and higher levels are even more permissive.
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## Always treated as errors
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- [AbstractMethodCall](issues/AbstractMethodCall.md)
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- [ComplexFunction](issues/ComplexFunction.md)
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- [ComplexMethod](issues/ComplexMethod.md)
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- [ConfigIssue](issues/ConfigIssue.md)
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- [DuplicateArrayKey](issues/DuplicateArrayKey.md)
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- [DuplicateClass](issues/DuplicateClass.md)
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- [DuplicateFunction](issues/DuplicateFunction.md)
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- [DuplicateMethod](issues/DuplicateMethod.md)
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- [DuplicateParam](issues/DuplicateParam.md)
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- [EmptyArrayAccess](issues/EmptyArrayAccess.md)
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- [ExtensionRequirementViolation](issues/ExtensionRequirementViolation.md)
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- [ImplementationRequirementViolation](issues/ImplementationRequirementViolation.md)
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- [ImpureByReferenceAssignment](issues/ImpureByReferenceAssignment.md)
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- [ImpureFunctionCall](issues/ImpureFunctionCall.md)
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- [ImpureMethodCall](issues/ImpureMethodCall.md)
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- [ImpurePropertyAssignment](issues/ImpurePropertyAssignment.md)
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- [ImpurePropertyFetch](issues/ImpurePropertyFetch.md)
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- [ImpureStaticProperty](issues/ImpureStaticProperty.md)
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- [ImpureStaticVariable](issues/ImpureStaticVariable.md)
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- [ImpureVariable](issues/ImpureVariable.md)
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- [InaccessibleClassConstant](issues/InaccessibleClassConstant.md)
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- [InaccessibleMethod](issues/InaccessibleMethod.md)
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- [InaccessibleProperty](issues/InaccessibleProperty.md)
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- [InterfaceInstantiation](issues/InterfaceInstantiation.md)
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- [InvalidAttribute](issues/InvalidAttribute.md)
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- [InvalidExtendClass](issues/InvalidExtendClass.md)
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- [InvalidGlobal](issues/InvalidGlobal.md)
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- [InvalidParamDefault](issues/InvalidParamDefault.md)
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- [InvalidParent](issues/InvalidParent.md)
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- [InvalidPassByReference](issues/InvalidPassByReference.md)
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- [InvalidScope](issues/InvalidScope.md)
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- [InvalidStaticInvocation](issues/InvalidStaticInvocation.md)
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- [InvalidThrow](issues/InvalidThrow.md)
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- [LoopInvalidation](issues/LoopInvalidation.md)
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- [MethodSignatureMustOmitReturnType](issues/MethodSignatureMustOmitReturnType.md)
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- [MethodSignatureMustProvideReturnType](issues/MethodSignatureMustProvideReturnType.md)
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- [MissingDependency](issues/MissingDependency.md)
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- [MissingFile](issues/MissingFile.md)
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- [MissingImmutableAnnotation](issues/MissingImmutableAnnotation.md)
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- [MissingTemplateParam](issues/MissingTemplateParam.md)
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- [MissingThrowsDocblock](issues/MissingThrowsDocblock.md)
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- [NonStaticSelfCall](issues/NonStaticSelfCall.md)
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- [NoValue](issues/NoValue.md)
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- [NullArrayAccess](issues/NullArrayAccess.md)
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- [NullFunctionCall](issues/NullFunctionCall.md)
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- [NullIterator](issues/NullIterator.md)
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- [NullPropertyAssignment](issues/NullPropertyAssignment.md)
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- [NullPropertyFetch](issues/NullPropertyFetch.md)
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- [NullReference](issues/NullReference.md)
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- [OverriddenPropertyAccess](issues/OverriddenPropertyAccess.md)
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- [ParadoxicalCondition](issues/ParadoxicalCondition.md)
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- [ParentNotFound](issues/ParentNotFound.md)
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- [TooFewArguments](issues/TooFewArguments.md)
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- [UndefinedAttributeClass](issues/UndefinedAttributeClass.md)
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- [UndefinedClass](issues/UndefinedClass.md)
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- [UndefinedConstant](issues/UndefinedConstant.md)
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- [UndefinedDocblockClass](issues/UndefinedDocblockClass.md)
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- [UndefinedFunction](issues/UndefinedFunction.md)
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- [UndefinedGlobalVariable](issues/UndefinedGlobalVariable.md)
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- [UndefinedInterface](issues/UndefinedInterface.md)
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- [UndefinedTrait](issues/UndefinedTrait.md)
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- [UndefinedVariable](issues/UndefinedVariable.md)
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- [UnimplementedAbstractMethod](issues/UnimplementedAbstractMethod.md)
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- [UnimplementedInterfaceMethod](issues/UnimplementedInterfaceMethod.md)
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- [UnrecognizedExpression](issues/UnrecognizedExpression.md)
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- [UnrecognizedStatement](issues/UnrecognizedStatement.md)
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- [UnusedFunctionCall](issues/UnusedFunctionCall.md)
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- [UnusedMethodCall](issues/UnusedMethodCall.md)
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## Errors that only appear at level 1
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- [LessSpecificReturnType](issues/LessSpecificReturnType.md)
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- [MixedArgument](issues/MixedArgument.md)
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- [MixedArgumentTypeCoercion](issues/MixedArgumentTypeCoercion.md)
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- [MixedArrayAccess](issues/MixedArrayAccess.md)
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- [MixedArrayAssignment](issues/MixedArrayAssignment.md)
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- [MixedArrayOffset](issues/MixedArrayOffset.md)
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- [MixedArrayTypeCoercion](issues/MixedArrayTypeCoercion.md)
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- [MixedAssignment](issues/MixedAssignment.md)
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- [MixedClone](issues/MixedClone.md)
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- [MixedFunctionCall](issues/MixedFunctionCall.md)
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- [MixedInferredReturnType](issues/MixedInferredReturnType.md)
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- [MixedMethodCall](issues/MixedMethodCall.md)
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- [MixedOperand](issues/MixedOperand.md)
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- [MixedPropertyAssignment](issues/MixedPropertyAssignment.md)
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- [MixedPropertyFetch](issues/MixedPropertyFetch.md)
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- [MixedPropertyTypeCoercion](issues/MixedPropertyTypeCoercion.md)
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- [MixedReturnStatement](issues/MixedReturnStatement.md)
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- [MixedReturnTypeCoercion](issues/MixedReturnTypeCoercion.md)
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- [MixedStringOffsetAssignment](issues/MixedStringOffsetAssignment.md)
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- [MutableDependency](issues/MutableDependency.md)
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- [PossiblyNullOperand](issues/PossiblyNullOperand.md)
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- [RedundantIdentityWithTrue](issues/RedundantIdentityWithTrue.md)
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- [Trace](issues/Trace.md)
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## Errors ignored at level 3 and higher
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These issues are treated as errors at level 2 and below.
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- [DeprecatedClass](issues/DeprecatedClass.md)
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- [DeprecatedConstant](issues/DeprecatedConstant.md)
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- [DeprecatedFunction](issues/DeprecatedFunction.md)
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- [DeprecatedInterface](issues/DeprecatedInterface.md)
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- [DeprecatedMethod](issues/DeprecatedMethod.md)
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- [DeprecatedProperty](issues/DeprecatedProperty.md)
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- [DeprecatedTrait](issues/DeprecatedTrait.md)
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- [DocblockTypeContradiction](issues/DocblockTypeContradiction.md)
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- [InvalidDocblockParamName](issues/InvalidDocblockParamName.md)
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- [InvalidFalsableReturnType](issues/InvalidFalsableReturnType.md)
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- [InvalidStringClass](issues/InvalidStringClass.md)
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- [MissingClosureParamType](issues/MissingClosureParamType.md)
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- [MissingClosureReturnType](issues/MissingClosureReturnType.md)
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- [MissingConstructor](issues/MissingConstructor.md)
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- [MissingParamType](issues/MissingParamType.md)
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- [MissingPropertyType](issues/MissingPropertyType.md)
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- [MissingReturnType](issues/MissingReturnType.md)
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- [NullOperand](issues/NullOperand.md)
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- [PropertyNotSetInConstructor](issues/PropertyNotSetInConstructor.md)
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- [RawObjectIteration](issues/RawObjectIteration.md)
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- [RedundantConditionGivenDocblockType](issues/RedundantConditionGivenDocblockType.md)
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- [RedundantFunctionCallGivenDocblockType](issues/RedundantFunctionCallGivenDocblockType.md)
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- [ReferenceConstraintViolation](issues/ReferenceConstraintViolation.md)
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- [UndefinedTrace](issues/UndefinedTrace.md)
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- [UnresolvableInclude](issues/UnresolvableInclude.md)
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- [UnsafeInstantiation](issues/UnsafeInstantiation.md)
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## Errors ignored at level 4 and higher
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These issues are treated as errors at level 3 and below.
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- [ArgumentTypeCoercion](issues/ArgumentTypeCoercion.md)
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- [LessSpecificReturnStatement](issues/LessSpecificReturnStatement.md)
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- [MoreSpecificReturnType](issues/MoreSpecificReturnType.md)
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- [PossiblyFalseArgument](issues/PossiblyFalseArgument.md)
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- [PossiblyFalseIterator](issues/PossiblyFalseIterator.md)
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- [PossiblyFalseOperand](issues/PossiblyFalseOperand.md)
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- [PossiblyFalsePropertyAssignmentValue](issues/PossiblyFalsePropertyAssignmentValue.md)
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- [PossiblyFalseReference](issues/PossiblyFalseReference.md)
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- [PossiblyInvalidArgument](issues/PossiblyInvalidArgument.md)
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- [PossiblyInvalidArrayAccess](issues/PossiblyInvalidArrayAccess.md)
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- [PossiblyInvalidArrayAssignment](issues/PossiblyInvalidArrayAssignment.md)
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- [PossiblyInvalidArrayOffset](issues/PossiblyInvalidArrayOffset.md)
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- [PossiblyInvalidCast](issues/PossiblyInvalidCast.md)
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- [PossiblyInvalidClone](issues/PossiblyInvalidClone.md)
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- [PossiblyInvalidFunctionCall](issues/PossiblyInvalidFunctionCall.md)
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- [PossiblyInvalidIterator](issues/PossiblyInvalidIterator.md)
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- [PossiblyInvalidMethodCall](issues/PossiblyInvalidMethodCall.md)
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- [PossiblyInvalidOperand](issues/PossiblyInvalidOperand.md)
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- [PossiblyInvalidPropertyAssignment](issues/PossiblyInvalidPropertyAssignment.md)
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- [PossiblyInvalidPropertyAssignmentValue](issues/PossiblyInvalidPropertyAssignmentValue.md)
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- [PossiblyInvalidPropertyFetch](issues/PossiblyInvalidPropertyFetch.md)
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- [PossiblyNullArgument](issues/PossiblyNullArgument.md)
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- [PossiblyNullArrayAccess](issues/PossiblyNullArrayAccess.md)
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- [PossiblyNullArrayAssignment](issues/PossiblyNullArrayAssignment.md)
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- [PossiblyNullArrayOffset](issues/PossiblyNullArrayOffset.md)
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- [PossiblyNullFunctionCall](issues/PossiblyNullFunctionCall.md)
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- [PossiblyNullIterator](issues/PossiblyNullIterator.md)
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- [PossiblyNullPropertyAssignment](issues/PossiblyNullPropertyAssignment.md)
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- [PossiblyNullPropertyAssignmentValue](issues/PossiblyNullPropertyAssignmentValue.md)
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- [PossiblyNullPropertyFetch](issues/PossiblyNullPropertyFetch.md)
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- [PossiblyNullReference](issues/PossiblyNullReference.md)
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- [PossiblyUndefinedArrayOffset](issues/PossiblyUndefinedArrayOffset.md)
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- [PossiblyUndefinedGlobalVariable](issues/PossiblyUndefinedGlobalVariable.md)
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- [PossiblyUndefinedMethod](issues/PossiblyUndefinedMethod.md)
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- [PossiblyUndefinedVariable](issues/PossiblyUndefinedVariable.md)
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- [PropertyTypeCoercion](issues/PropertyTypeCoercion.md)
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- [RiskyCast](issues/RiskyCast.md)
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## Errors ignored at level 5 and higher
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These issues are treated as errors at level 4 and below.
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- [FalseOperand](issues/FalseOperand.md)
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- [ForbiddenCode](issues/ForbiddenCode.md)
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- [ImplementedParamTypeMismatch](issues/ImplementedParamTypeMismatch.md)
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- [ImplementedReturnTypeMismatch](issues/ImplementedReturnTypeMismatch.md)
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- [ImplicitToStringCast](issues/ImplicitToStringCast.md)
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- [InternalClass](issues/InternalClass.md)
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- [InternalMethod](issues/InternalMethod.md)
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- [InternalProperty](issues/InternalProperty.md)
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- [InvalidDocblock](issues/InvalidDocblock.md)
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- [InvalidLiteralArgument](issues/InvalidLiteralArgument.md)
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- [InvalidOperand](issues/InvalidOperand.md)
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- [InvalidScalarArgument](issues/InvalidScalarArgument.md)
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- [InvalidToString](issues/InvalidToString.md)
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- [MismatchingDocblockParamType](issues/MismatchingDocblockParamType.md)
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- [MismatchingDocblockReturnType](issues/MismatchingDocblockReturnType.md)
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- [MissingDocblockType](issues/MissingDocblockType.md)
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- [NoInterfaceProperties](issues/NoInterfaceProperties.md)
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- [PossibleRawObjectIteration](issues/PossibleRawObjectIteration.md)
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- [RedundantCondition](issues/RedundantCondition.md)
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- [RedundantFunctionCall](issues/RedundantFunctionCall.md)
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- [RedundantPropertyInitializationCheck](issues/RedundantPropertyInitializationCheck.md)
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- [StringIncrement](issues/StringIncrement.md)
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- [TooManyArguments](issues/TooManyArguments.md)
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- [TypeDoesNotContainNull](issues/TypeDoesNotContainNull.md)
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- [TypeDoesNotContainType](issues/TypeDoesNotContainType.md)
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- [UndefinedMagicMethod](issues/UndefinedMagicMethod.md)
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- [UndefinedMagicPropertyAssignment](issues/UndefinedMagicPropertyAssignment.md)
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- [UndefinedMagicPropertyFetch](issues/UndefinedMagicPropertyFetch.md)
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## Errors ignored at level 6 and higher
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These issues are treated as errors at level 5 and below.
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- [ConstructorSignatureMismatch](issues/ConstructorSignatureMismatch.md)
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- [FalsableReturnStatement](issues/FalsableReturnStatement.md)
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- [InvalidNullableReturnType](issues/InvalidNullableReturnType.md)
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- [LessSpecificImplementedReturnType](issues/LessSpecificImplementedReturnType.md)
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- [MoreSpecificImplementedParamType](issues/MoreSpecificImplementedParamType.md)
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- [NullableReturnStatement](issues/NullableReturnStatement.md)
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- [UndefinedInterfaceMethod](issues/UndefinedInterfaceMethod.md)
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- [UndefinedThisPropertyAssignment](issues/UndefinedThisPropertyAssignment.md)
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## Errors ignored at level 7 and higher
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These issues are treated as errors at level 6 and below.
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- [InvalidArgument](issues/InvalidArgument.md)
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- [InvalidArrayAccess](issues/InvalidArrayAccess.md)
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- [InvalidArrayAssignment](issues/InvalidArrayAssignment.md)
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- [InvalidArrayOffset](issues/InvalidArrayOffset.md)
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- [InvalidCast](issues/InvalidCast.md)
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- [InvalidCatch](issues/InvalidCatch.md)
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- [InvalidClass](issues/InvalidClass.md)
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- [InvalidClone](issues/InvalidClone.md)
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- [InvalidFunctionCall](issues/InvalidFunctionCall.md)
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- [InvalidIterator](issues/InvalidIterator.md)
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- [InvalidMethodCall](issues/InvalidMethodCall.md)
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- [InvalidNamedArgument](issues/InvalidNamedArgument.md)
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- [InvalidPropertyAssignment](issues/InvalidPropertyAssignment.md)
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- [InvalidPropertyAssignmentValue](issues/InvalidPropertyAssignmentValue.md)
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- [InvalidPropertyFetch](issues/InvalidPropertyFetch.md)
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- [InvalidReturnStatement](issues/InvalidReturnStatement.md)
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- [InvalidReturnType](issues/InvalidReturnType.md)
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- [InvalidTemplateParam](issues/InvalidTemplateParam.md)
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- [NullArgument](issues/NullArgument.md)
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- [NullArrayOffset](issues/NullArrayOffset.md)
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- [TooManyTemplateParams](issues/TooManyTemplateParams.md)
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- [TraitMethodSignatureMismatch](issues/TraitMethodSignatureMismatch.md)
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- [UndefinedMethod](issues/UndefinedMethod.md)
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- [UndefinedPropertyAssignment](issues/UndefinedPropertyAssignment.md)
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- [UndefinedPropertyFetch](issues/UndefinedPropertyFetch.md)
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- [UndefinedThisPropertyFetch](issues/UndefinedThisPropertyFetch.md)
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## Errors ignored at level 8
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These issues are treated as errors at level 7 and below.
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- [AbstractInstantiation](issues/AbstractInstantiation.md)
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- [AssignmentToVoid](issues/AssignmentToVoid.md)
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- [CircularReference](issues/CircularReference.md)
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- [ConflictingReferenceConstraint](issues/ConflictingReferenceConstraint.md)
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- [ContinueOutsideLoop](issues/ContinueOutsideLoop.md)
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- [InvalidTypeImport](issues/InvalidTypeImport.md)
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- [MethodSignatureMismatch](issues/MethodSignatureMismatch.md)
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- [OverriddenMethodAccess](issues/OverriddenMethodAccess.md)
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- [ParamNameMismatch](issues/ParamNameMismatch.md)
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- [ReservedWord](issues/ReservedWord.md)
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- [UnhandledMatchCondition](issues/UnhandledMatchCondition.md)
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- [UninitializedProperty](issues/UninitializedProperty.md)
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## Feature-specific errors
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- [PossiblyUndefinedIntArrayOffset](issues/PossiblyUndefinedIntArrayOffset.md)
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- [PossiblyUndefinedStringArrayOffset](issues/PossiblyUndefinedStringArrayOffset.md)
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- [PossiblyUnusedMethod](issues/PossiblyUnusedMethod.md)
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- [PossiblyUnusedParam](issues/PossiblyUnusedParam.md)
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- [PossiblyUnusedProperty](issues/PossiblyUnusedProperty.md)
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- [TaintedCallable](issues/TaintedCallable.md)
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- [TaintedCookie](issues/TaintedCookie.md)
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- [TaintedCustom](issues/TaintedCustom.md)
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- [TaintedEval](issues/TaintedEval.md)
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- [TaintedFile](issues/TaintedFile.md)
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- [TaintedHeader](issues/TaintedHeader.md)
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- [TaintedHtml](issues/TaintedHtml.md)
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- [TaintedInclude](issues/TaintedInclude.md)
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- [TaintedInput](issues/TaintedInput.md)
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- [TaintedLdap](issues/TaintedLdap.md)
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- [TaintedShell](issues/TaintedShell.md)
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- [TaintedSql](issues/TaintedSql.md)
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- [TaintedSSRF](issues/TaintedSSRF.md)
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- [TaintedSystemSecret](issues/TaintedSystemSecret.md)
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- [TaintedUnserialize](issues/TaintedUnserialize.md)
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- [TaintedUserSecret](issues/TaintedUserSecret.md)
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- [UncaughtThrowInGlobalScope](issues/UncaughtThrowInGlobalScope.md)
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- [UnevaluatedCode](issues/UnevaluatedCode.md)
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- [UnnecessaryVarAnnotation](issues/UnnecessaryVarAnnotation.md)
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- [UnusedClass](issues/UnusedClass.md)
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- [UnusedClosureParam](issues/UnusedClosureParam.md)
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- [UnusedConstructor](issues/UnusedConstructor.md)
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- [UnusedForeachValue](issues/UnusedForeachValue.md)
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- [UnusedMethod](issues/UnusedMethod.md)
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- [UnusedParam](issues/UnusedParam.md)
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- [UnusedProperty](issues/UnusedProperty.md)
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- [UnusedPsalmSuppress](issues/UnusedPsalmSuppress.md)
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- [UnusedVariable](issues/UnusedVariable.md)
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