How Git works - super simplified! — https://www.youtube.com/watch?v=T9Nag5IXVQ0

git.js

// blob = file contents, identified by hash
const blobs = {
  '73d8a': 'import x from "y"; console.log("some file contents")',
  '9c6bd': 'D8 A1 31 0F ...',
  '547d4': '# Readme\nThis is documentation',
  'a0302': '# Readme\nThis is some updated documentation',
}
 
// tree = references to blobs and trees, identified by hash
const trees = {
  '811cb': [
    'blob: 9c6bd logo.png',
    'blob: 73d8a main.js',
  ],
  '877af': [
    'tree: 811cb source',
    'blob: 547d4 readme.md',
  ],
  '7d676': [
    'tree: 811cb source',
    'blob: a0302 readme.md',
  ],
}

// commit = ref to tree + metadata, identified by hash
const commits = {
  '841b9': {
    tree: '877af',
    parent: null,
    message: 'feat: Initial commit, add file structure',
    author: 'bran',
    datetime: '1970-01-01 13:37:00',
  },
  '199df': {
    tree: '7d676',
    parent: '841b9',
    message: 'docs: Update readme',
    author: 'colleague',
    datetime: '1971-02-02 13:37:00',
  },
}


// branch/tag/ref = named pointers to commit
const refs = {
  'HEAD': '199df',
  'main': '199df',
  'feature/xyz': '841b9',
}