type_ literal_ in_ constant_ pattern
Don't use constant patterns with type literals.
Details
#If you meant to test if the object has type Foo
, instead write Foo _
.
BAD:
void f(Object? x) {
if (x case num) {
print('int or double');
}
}
GOOD:
void f(Object? x) {
if (x case num _) {
print('int or double');
}
}
If you do mean to test that the matched value (which you expect to have the
type
Type
) is equal to the type literal
Foo
, then this lint can be
silenced using
const (Foo)
.
BAD:
void f(Object? x) {
if (x case int) {
print('int');
}
}
GOOD:
void f(Object? x) {
if (x case const (int)) {
print('int');
}
}
Enable
#
To enable the
type_literal_in_constant_pattern
rule, add
type_literal_in_constant_pattern
under
linter > rules
in your
analysis_options.yaml
file:
linter:
rules:
- type_literal_in_constant_pattern
If you're instead using the YAML map syntax to configure linter rules,
add
type_literal_in_constant_pattern: true
under
linter > rules:
linter:
rules:
type_literal_in_constant_pattern: true
Unless stated otherwise, the documentation on this site reflects Dart 3.9.2. Report an issue.