index.js

var Fuse = require('fuse.js');

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var options = {
  shouldSort: true,
  includeMatches: true,
  threshold: 0.4,
  location: 0,
  distance: 100,
  maxPatternLength: 32,
  minMatchCharLength: 1,
  keys: [
    "name"
  ]
};
var fuse = new Fuse(list, options); // "list" is the item array
var result = fuse.search("a");

var highlighter = function(resultItem){
  resultItem.matches.forEach((matchItem) => {
    var text = resultItem.item[matchItem.key];
    var result = []
    var matches = [].concat(matchItem.indices); // limpar referencia
    var pair = matches.shift()
    
    for (var i = 0; i < text.length; i++) {
      var char = text.charAt(i)
      if (pair && i == pair[0]) {
        result.push('<b>')
      }
      result.push(char)
      if (pair && i == pair[1]) {
        result.push('</b>')
        pair = matches.shift()
      }
    }
    resultItem.highlight = result.join('');

    if(resultItem.children && resultItem.children.length > 0){
      resultItem.children.forEach((child) => {
        highlighter(child);
      });
    }
  });
};

result.forEach((resultItem) => {
  highlighter(resultItem);
});

console.log(JSON.stringify(result, null, '  '));