Don't put any logic in createState DRT-W1023
DON'T put any logic in createState(). Implementations of createState() should return a new instance
Don't assign a variable to itself DRT-W1024
DON'T assign a variable to itself. Usually this is a mistake. BAD:
Don't use wildcard parameters or variables DRT-W1025
DON'T use wildcard parameters or variables. Wildcard parameters and local variables
Don't use the Null type, unless you are positive that you don't want void DRT-W1027
DON'T use the type Null where void would work. BAD:
Separate the control structure expression from its statement DRT-W1041
From the style guide for the flutter repo: DO separate the control structure expression from its statement.
Avoid unnecessary containers DRT-W1072
AVOID wrapping widgets in unnecessary containers. Wrapping a widget in Container with no other parameters set has no effect
Missing whitespace between adjacent strings DRT-W1104
Add a trailing whitespace to prevent missing whitespace between adjacent strings.
Provide doc comments for all public APIs DRT-W1117
DO provide doc comments for all public APIs. As described in the pub package layout doc,
Use interpolation to compose strings and values DRT-W1146
PREFER using interpolation to compose strings and values. Using interpolation when composing strings and values is usually easier to write
Unnecessary new keyword DRT-W1182
AVOID new keyword to create instances. BAD:
Parameter type mismatch for constant constructor DRT-W1265
The analyzer produces this diagnostic when the runtime type of a constant value can't be assigned to the static type of a constant constructor's parameter.
Remove deprecated key from pubspec.yaml DRT-W1297
The analyzer produces this diagnostic when a key is used in a pubspec.yaml file that was deprecated. Unused keys take up space and might imply semantics that are no longer valid.
The operator x ~/ y is more efficient than (x / y).toInt() DRT-W1302
The analyzer produces this diagnostic when the result of dividing two numbers is converted to an integer using toInt. Dart has a built-in integer division operator that is both more efficient and more concise.
Avoid empty else statements DRT-W1003
AVOID empty else statements. BAD:
Avoid final for parameter declarations DRT-W1054
AVOID declaring parameters as final. Declaring parameters as final can lead to unnecessarily verbose code, especially
Sort combinator names alphabetically DRT-W1080
DO sort combinator names alphabetically. BAD:
Only throw instances of classes extending either Exception or Error DRT-W1115
DO throw only instances of classes that extend dart.core.Error or dart.core.Exception.
Prefer putting asserts in initializer lists DRT-W1121
DO put asserts in initializer lists. BAD:
Integer literal exceeds 64-bit representation limit DRT-W1406
The analyzer produces this diagnostic when an integer literal has a value that is too large (positive) or too small (negative) to be represented in a 64-bit word.
Prefer final in for-each loop variable if reference is not reassigned DRT-W1134
DO prefer declaring for-each loop variables as final if they are not reassigned later in the code.