no-empty-pattern
NOTE: this rule is part of the
recommended rule set.Enable full set in
deno.json:{
"lint": {
"tags": ["recommended"]
}
}Enable full set using the Deno CLI:
deno lint --tags=recommended
Disallows the use of empty patterns in destructuring.
In destructuring, it is possible to use empty patterns such as {} or []
which have no effect, most likely not what the author intended.
Invalid:
// In these examples below, {} and [] are not object literals or empty arrays,
// but placeholders for destructured variable names
const {} = someObj;
const [] = someArray;
const {a: {}} = someObj;
const [a: []] = someArray;
function myFunc({}) {}
function myFunc([]) {}
Valid:
const { a } = someObj;
const [a] = someArray;
// Correct way to default destructured variable to object literal
const { a = {} } = someObj;
// Correct way to default destructured variable to empty array
const [a = []] = someArray;
function myFunc({ a }) {}
function myFunc({ a = {} }) {}
function myFunc([a]) {}
function myFunc([a = []]) {}