Advent of Code

I'm doing Advent of Code again this year, this time in TypeScript (GitHub).
Day 1: Sonar Sweep
Day 2: Dive!
Day 3: Diagnostic Report
Day 4: Giant Squid
Day 5: Hydrothermal Venture
Day 6: Lanternfish
Day 7: The Treachery of Whales
Day 8: Seven Segment Search
Day 9: Smoke Basin
Day 10: Syntax Scoring
Day 11: Dumbo Octopus