E0091: switch statement needs parentheses around condition

switch statements have a condition after the switch keyword. It is a syntax error to write a condition without ( and ):

function colorToHexCode(color) {
  switch color {
    case 'red':   return '#ff0000';
    case 'green': return '#00ff00';
    case 'blue':  return '#0000ff';
  }
}

To fix this error, write ( before the condition and ) after the condition:

function colorToHexCode(color) {
  switch (color) {
    case 'red':   return '#ff0000';
    case 'green': return '#00ff00';
    case 'blue':  return '#0000ff';
  }
}

Introduced in quick-lint-js version 0.2.0.

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