avoid_type_to_string

Avoid .toString() in production code since results may be minified.

This rule is available as of Dart 2.12.0.

Details

DO avoid calls to .toString() in production code, since it does not contractually return the user-defined name of the Type (or underlying class). Development-mode compilers where code size is not a concern use the full name, but release-mode compilers often choose to minify these symbols.

BAD:

void bar(Object other) {
  if (other.runtimeType.toString() == 'Bar') {
    doThing();
  }
}

Object baz(Thing myThing) {
  return getThingFromDatabase(key: myThing.runtimeType.toString());
}

GOOD:

void bar(Object other) {
  if (other is Bar) {
    doThing();
  }
}

class Thing {
  String get thingTypeKey => ...
}

Object baz(Thing myThing) {
  return getThingFromDatabase(key: myThing.thingTypeKey);
}

Usage

To enable the avoid_type_to_string rule, add avoid_type_to_string under linter > rules in your analysis_options.yaml file:

linter:
  rules:
    - avoid_type_to_string