max-nested-callbacks
Enforce a maximum depth that callbacks can be nested
Many JavaScript libraries use the callback pattern to manage asynchronous operations. A program of any complexity will most likely need to manage several asynchronous operations at various levels of concurrency. A common pitfall that is easy to fall into is nesting callbacks, which makes code more difficult to read the deeper the callbacks are nested.
foo(function () {
bar(function () {
baz(function() {
qux(function () {
});
});
});
});
Rule Details
This rule enforces a maximum depth that callbacks can be nested to increase code clarity.
Options
This rule has a number or object option:
"max"(default10) enforces a maximum depth that callbacks can be nested
Deprecated: The object property maximum is deprecated; please use the object property max instead.
max
Examples of incorrect code for this rule with the { "max": 3 } option:
Open in Playground
/*eslint max-nested-callbacks: ["error", 3]*/
foo1(function() {
foo2(function() {
foo3(function() {
foo4();
});
});
});
Examples of correct code for this rule with the { "max": 3 } option:
Open in Playground
/*eslint max-nested-callbacks: ["error", 3]*/
foo1(handleFoo1);
function handleFoo1() {
foo2(handleFoo2);
}
function handleFoo2() {
foo3(handleFoo3);
}
function handleFoo3() {
foo4(handleFoo4);
}
function handleFoo4() {
foo5();
}
Related Rules
Version
This rule was introduced in ESLint v0.2.0.