Developer Roadmaps & Cheatsheets

// 1. Deep Readonly
type DeepReadonly<T> = {
  readonly [P in keyof T]: T[P] extends object ? DeepReadonly<T[P]> : T[P];
};

// 2. Prettify Type Helper (Flattens nested object types in IDE tooltips)
type Prettify<T> = {
  [K in keyof T]: T[K];
} & {};

// 3. Strip Nullable and Undefined properties
type NonNullableFields<T> = {
  [P in keyof T]: NonNullable<T[P]>;
};

// 4. Dynamic Event Name Generator (Template Literal Types)
type EventName = `on${'Click' | 'Hover' | 'Focus' | 'Blur'}`;

// 5. Extract Function Argument Types
type ExtractParams<T> = T extends (...args: infer P) => any ? P : never;

#!/bin/bash
# 1. Amend previous commit without changing commit message
git commit --amend --no-edit

# 2. Interactively squash the last 3 commits
git rebase -i HEAD~3

# 3. Temporarily stash uncommitted changes
git stash push -m "WIP changes"
git stash pop

# 4. Recover lost or deleted commits / branches
git reflog
git checkout -b recovered-branch HEAD@{2}

# 5. Cleanly sync branch with remote main
git fetch origin && git reset --hard origin/main

#!/bin/bash
# 1. Rebuild and launch compose services in background
docker compose up --build -d

# 2. Clean unused containers, dangling images, and volumes
docker system prune -a --volumes -f

# 3. Open shell terminal inside running container
docker exec -it <container_name_or_id> /bin/sh

# 4. Stream real-time container logs
docker logs -f --tail 100 <container_name_or_id>

# 5. Monitor live CPU & memory consumption
docker stats

"use server";

import { revalidatePath, revalidateTag } from "next/cache";

export async function createPostAction(prevState: any, formData: FormData) {
  const title = formData.get("title") as string;
  const content = formData.get("content") as string;

  if (!title || title.length < 3) {
    return { success: false, error: "Title must be at least 3 characters." };
  }

  // Database mutation logic
  // await db.post.create({ data: { title, content } });

  revalidatePath("/blog");
  revalidateTag("posts-feed", "layout");

  return { success: true, message: "Post created successfully!" };
}