```ts
export function mergeIntervals(intervals: number[][]): number[][] {
    if (intervals.length === 0) return [];

    // Sort intervals by start time
    intervals.sort((a, b) => a[0] - b[0]);

    const mergedIntervals: number[][] = [];
    let currentInterval = intervals[0];

    for (let i = 1; i < intervals.length; i++) {
        const nextInterval = intervals[i];

        // Check if the current interval overlaps with the next one
        if (currentInterval[1] >= nextInterval[0]) {
            // Merge the intervals
            currentInterval[1] = Math.max(currentInterval[1], nextInterval[1]);
        } else {
            // If no overlap, add the current interval to the result and update currentInterval
            mergedIntervals.push([...currentInterval]);
            currentInterval = [...nextInterval];
        }
    }

    // Add the last merged interval
    mergedIntervals.push(currentInterval);

    return mergedIntervals;
}
```