v2.2.0

• Imports are prefixed with _i1 rather than _1 which satisfies the lint
  lowercase_with_underscores. While not a strictly breaking change you may
  have to fix/regenerate golden file-like tests. We added documentation that
  the specific prefix is not considered stable.

• Added Expression.index for accessing the [] operator:

void main() {
  test('should emit an index operator', () {
    expect(
      refer('bar').index(literalTrue).assignVar('foo').statement,
      equalsDart('var foo = bar[true];'),
    );
}  );

  test('should emit an index operator set', () {
    expect(
      refer('bar')
        .index(literalTrue)
        .assign(literalFalse)
        .assignVar('foo')
        .statement,
      equalsDart('var foo = bar[true] = false;'),
    );
  });
}

• literalList accepts an Iterable argument.

• Fixed an NPE when a method had a return type of a FunctionType:

void main() {
  test('should create a method with a function type return type', () {
    expect(
      new Method((b) => b
        ..name = 'foo'
        ..returns = new FunctionType((b) => b
          ..returnType = refer('String')
          ..requiredParameters.addAll([
            refer('int'),
          ]))),
      equalsDart(r'''
        String Function(int) foo();
      '''),
    );
  });
}