sync.js

const tasks={
  a:{
    job:function(){console.log("Tasks A running")},
    dependency:["c","b"]
  },
  b:{
    job:function(){console.log("Tasks B running")},
    dependency:[]
  },
  c:{
    job:function(){console.log("Tasks C running")},
    dependency:["b"]
  }
};

const done = new Map();
function run(name) {
  switch (done.get(name)) {
    case true: return
    case false: throw new Error(`loop visiting ${name}`)
  }
  done.set(name, false)
  const task = tasks[name];
  for (const dep of task.dependency) run(dep);
  task.job();
  done.set(name, true)
}
for (const name in tasks) run(name);