规则详情

该规则旨在通过限制程序中允许的圈复杂度来降低代码复杂度。因此，当圈复杂度超过配置的阈值（默认为 20）时，它会发出警告。

This rule is aimed at reducing code complexity by capping the amount of cyclomatic complexity allowed in a program. As such, it will warn when the cyclomatic complexity crosses the configured threshold (default is 20).

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/*eslint complexity: ["error", 2]*/

function a(x) {
    if (true) {
        return x;
    } else if (false) {
        return x+1;
    } else {
        return 4; // 3rd path
    }
}

function b() {
    foo ||= 1;
    bar &&= 1;
}

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/*eslint complexity: ["error", 2]*/

function a(x) {
    if (true) {
        return x;
    } else {
        return 4;
    }
}

function b() {
    foo ||= 1;
}

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/*eslint complexity: ["error", 2]*/

class C {
    x = a || b || c; // this initializer has complexity = 3
}

class D { // this static block has complexity = 3
    static {
        if (foo) {
            bar = baz || qux;
        }
    }
}

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/*eslint complexity: ["error", 2]*/

function foo() { // this function has complexity = 1
    class C {
        x = a + b; // this initializer has complexity = 1
        y = c || d; // this initializer has complexity = 2
        z = e && f; // this initializer has complexity = 2

        static p = g || h; // this initializer has complexity = 2
        static q = i ? j : k; // this initializer has complexity = 2

        static { // this static block has complexity = 2
            if (foo) {
                baz = bar;
            }
        }

        static { // this static block has complexity = 2
            qux = baz || quux;
        }
    }
}