some changes made in the init script

[GarvGupta20]

hello,
i am a fresher and doing computer science and totally admire your under the hood series and i made 2 specific changes

In init.mjs i provided the argument in the writeFilesync function and in commit.mjs

[acc[key].push(curr) this was creating compilation problem so chanaged it to acc.push(curr);

thank u for this project which helped me learn so much.

[craigtaub]

Thanks for the contribution and so glad to hear you find the series useful.
I'm really busy right now so will try and have a review of this soon. I will just ask you make sure any changes are purely functional related so any personal comments or linting preferences are kept out, thanks so much.