unicorn/prefer-optional-catch-binding

Require catch {} without a parameter when the error is not used

fixable

catch doesn't need a parameter. A name that's never read sends the reader looking for where the error is handled.

--fix removes the parameter and its parentheses.

Configure#

Off by default. To turn it on:

bunfig.toml
[lint.rules]
"unicorn/prefer-optional-catch-binding" = "error" # or "warn"

Examples#

example.js2 problems
function parse(text) {
  try {
    return JSON.parse(text);
  } catch (error) {
    return undefined;
  }
}

try {
  await upload(file);
} catch ({ message }) {
  retry(file);
}
example.jsNo problems
function parse(text) {
  try {
    return JSON.parse(text);
  } catch {
    return undefined;
  }
}

try {
  await upload(file);
} catch ({ message }) {
  console.error(message);
}