in src/QldbHash.ts [135:149]
static _joinHashesPairwise(h1: Uint8Array, h2: Uint8Array): Uint8Array {
if (h1.length === 0) {
return h2;
}
if (h2.length === 0) {
return h1;
}
let concatenated: Uint8Array;
if (this._hashComparator(h1, h2) < 0) {
concatenated = this._concatenate(h1, h2);
} else {
concatenated = this._concatenate(h2, h1);
}
return concatenated;
}