tslint one line rule misplaced 'else'

Question

I have such config in tslint.json for one line rule

one-line": [true,
      "check-open-brace",
      "check-catch",
      "check-else",
      "check-whitespace"
    ],

When I have code lines like that:

if(SomethingTrue) { next("a"); }
else { next("b"); }

I've got warning:

(one-line) file.ts[17, 9]: misplaced 'else'

Why that is happens? Is it bad practice to have one line else?

Answer 1

if (condition is true) {
  // do something;
}
else {
  // do something else;
}

Notice that else comes next to }

if (condition is true) {
  // do something;
} else {
  // do something else;
}

Answer 2

According to the tslint docs the problem is that when "check-else" is specified under one-line the else must be on the same line as the closing brace for your if.

So in your case instead of:

if(SomethingTrue) { next("a"); }
else { next("b"); }

Use this format:

if(SomethingTrue) { next("a"); } else { next("b"); }

Answer 3

if (condition) {
  // Your Code
} else {
  // Your Code
}

End of If and start of else should be on the same line.

Answer 4

You have :

else { next("b"); }

Else must be one one line. So:

else { 
    next("b"); 
}

Is it bad practice to have one line else?

Just easier to read. Its a styleguide for consistency.