falcon

Rules / Suspicious / empty-statements

empty-statements

lint/suspicious/empty-statements
recommended
Same as empty_statements · Dart lints

Flags stray empty statements (a lone ;).

A solitary semicolon does nothing, and where it slips in it usually changes meaning: while (cond); turns the following block into an unconditional body, and a stray ; after an if header detaches the intended branch. It is almost always an accidental extra semicolon or a loop body that should have been a block. Remove it, or replace it with the block that was intended. The semicolons in a for (;;) header are loop syntax, not statements, and are never reported.

Invalid

example.dartdart
void f1() {
  ;
}

void f2() {
  print('x');
  ;
}

void f3(bool x) {
  while (x) ;
}

void f4() {
  for (var i = 0; i < 1; i++) ;
}

void f5(bool x) {
  if (x) ;
}

void f6() {
  print('a');
  ;
  print('b');
}
Unnecessary empty statement — remove the `;` or replace it with a block
1void f1() {
2 ;
Unnecessary empty statement — remove the `;` or replace it with a block
6 print('x');
7 ;
Unnecessary empty statement — remove the `;` or replace it with a block
10void f3(bool x) {
11 while (x) ;
Unnecessary empty statement — remove the `;` or replace it with a block
14void f4() {
15 for (var i = 0; i < 1; i++) ;
Unnecessary empty statement — remove the `;` or replace it with a block
18void f5(bool x) {
19 if (x) ;
Unnecessary empty statement — remove the `;` or replace it with a block
23 print('a');
24 ;

Valid

example.dartdart
void g1() {
  print('x');
}

void g2(bool x) {
  while (x) {
    print('loop');
  }
}

void g3() {
  for (var i = 0; i < 1; i++) {
    print(i);
  }
}

void g4(bool x) {
  if (x) {
    print('yes');
  }
}

void g5() {
  var a = 1;
  var b = 2;
  print(a + b);
}

void g6() {
  print('a');
  print('b');
}

How to configure

Set the severity of empty-statements in your falcon.json:

falcon.jsonjson
{
  "linter": {
    "rules": {
      "suspicious": {
        "empty-statements": "error"
      }
    }
  }
}

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