jnpf-web-vue3/node_modules/@logicflow/extension/es/materials/curved-edge/searchMiddleIndex.js

export default function searchMiddleIndex(arr) {
    if (arr.length <= 1)
        return false;
    var first = 0;
    var last = arr.length - 1;
    while (first !== last && first + 1 !== last && last - 1 !== first) {
        first++;
        last--;
    }
    if (first === last) {
        return [--first, last];
    }
    return [first, last];
}