Advent of code 2020
Folders are organized by day.
Within each day is a bundle of scripts / node modules, notably a script named solution.js and a text file named input.txt. Within each day's solution module, runPart1 is the method for solving part 1 of the day, and runPart2 is the method for solving part 2 of the day. Solution modules may also define a parseInput method. If this method is defined, input from the input.txt file will be automatically run through that method before being passed to the solvers.
To run a given solution, from the top-level folder, run npm run solution [X]. Where X is one of the advent days. If a single number is specified, (e.g. npm run solution 12), both parts of the solution will be run and their output will be put in the console. Alternatively, you can run a single part of the solution, by specifying 1 or 2 after a dash (e.g. npm run solution 7-1 or npm run solution 20-2).
To run all tests I've written, you can run npm run test. You can also specify tests to run for a certain day by including that as an argument (e.g. npm run test 5)
To scaffold out folders and files for each day at the start of a new year, you can run npm run scaffold. This creates folders 01 - 25 and copies the solution and input templates into each folder.