.cursorignore` in Refine codebase excludes files from AI features & indexing, similar to `.gitignore`, but with a best-effort approach. It's used to prevent sensitive secrets and proprietary code access by AI.

warnOnce(package, 'warning message') prints a warning exactly once in dev mode. Install with npm install warn-once for deprecation warnings & more! Only shown if NODE_ENV isn't "production".

Refine's Telemetry component sends usage data to refine.dev, encoding payload with JSON.stringify & base64, using transport function which falls back to Image or fetch if available.

useDeepMemo` imported from `@hooks/deepMemo`, memoizes dependencies with deep equality, returning same value on unchanged deps. Used in Refine's query client creation.

React-Scan code review: `createHighlightCanvas` creates a canvas for highlighting elements, handling resize events & updating canvas dimensions. Cleanup involves removing duplicate resize listeners to avoid memory leaks.

Preact's mangle.json enables property mangling, compressing property names to reduce size. Configured in package.json or a separate file, it uses Terser and regular expressions to shorten property names.

Oxlint is a linter 50-100 times faster than ESLint, with over 480 rules. It's designed to catch errors without config & scales with CPU cores. Used in Preact source code as "oxlint": "oxlint -c oxlint.json src test/browser...

React-Scan uses Preact's Signals for state management. Signals are reactive primitives that automatically update components & UI when state changes, providing excellent ergonomics & performance.

Preact is a fast 3kB alternative to React with the same modern API. It's used in react-scan source code, mainly for its performance and efficiency features. Approximately 38 files use Preact, but only one file imports from "react".

DOMParser parses XML or HTML source code into a DOM Document. In react-scan, it's used to convert SVG strings into DOM elements for rendering.

Found bippy in react-scan source code, a toolkit to hack into React internals, allowing access to fiber tree and other internals.

checkNodeVersion() checks if node version is >= MIN_NODE_VERSION (except v15 or v17). If not, it logs an error and exits the process with code 1.

Father installs npm dependencies programmatically using `getNpmClient` and `installWithNpmClient` from `@umijs/utils`.

Tsup source code uses Node.js to remove files from file system. cleanDtsFiles function calls removeFiles which uses glob and fs to delete files.

Building a CLI tool for Next.js projects. Created a monorepo with `pnpm` and set up `tsconfig.json` using `@repo/typescript-config`. Added `tsup` to bundle TypeScript code.

useSyncExternalStore used in TipTap's EditorContent, useEditorState & useEditor to sync editor instance with component state for performance reasons.

TipTap's ReactRenderer uses `flushSync` to force DOM updates synchronously, fixing a cursor positioning issue on first render. `flushSync` is uncommon and can hurt performance.

isClassComponent function checks if a React Component is a class component. It returns true if the Component is a function with an isReactComponent property.

Exploring Grida's __useInternal() function, which provides state and dispatch to child components within a StandaloneDocumentEditor.

In Grida source code, `toolbar_value_to_cursormode` function converts toolbar value to cursor mode using switch-case. It returns an object with type and node/tool properties based on the input value.

setCursorMode in Grida source code sets cursor mode by dispatching an object with type "surface/cursor-mode" and cursor_mode to the _useInternal hook.

Found /canvas route in Grida codebase. Located in apps/forms, under dev route group, canvas/page.tsx has dynamic import of PlaygroundCanvas component from @/scaffolds/playground-canvas/playground.

Review of Citty, an elegant CLI builder by Unjs. Implemented in unbuild source code with custom arguments for building and minifying.

listRecursively function in unbuild/src/utils.ts recursively lists files & dirs. Uses Set to prevent duplicates, calls walk function for each dir.

Assert in Grida source code: assert stops execution & throws AssertionError with custom error message. Use to add defensive mechanisms with clear error messages. Read more about assert in Node.js: https://nodejs.org/api/assert.html-message

To set up Grida's dev env, use `git clone --recurse-submodules https://github.com/gridaco/grida`. This clones submodules & allows pnpm install. Run `pnpm run dev` to start dev environment.

Defu vs lodash._merge: Defu assigns default properties recursively, but doesn't merge arrays. lodash._merge merges objects and arrays recursively. Key difference: Defu overwrites existing array items, while lodash._merge preserves them.

Discover pretty-bytes, a package that converts bytes to human-readable strings! Used in unbuild OSS project, it's a game-changer for reporting file sizes. npm install pretty-bytes and learn more about its usage!

Discover Hookable, a package by Unjs for Awaitable Hooks. Learn how to use it in unbuild source code: create hooks, register them & call them to trigger callbacks.

Discover Defu, a package by Unjs that assigns default properties recursively. Learn how to use it with examples and explore its usage in unbuild source code.

Discover Jiti, a package by Unjs that enables seamless interoperability between ESM & CommonJS in Node.js. Used in Docusaurus & Unbuild projects for loading modules with various syntax support.

.gitkeep` file: a blank file added to empty directories to sync local dir structure with GitHub repo. Found in Shadcn/ui codebase, e.g., `pages/api`, `pages`, and `registry` dirs. Not needed after initial push.

lobechat's renovate config: https://github.com/lobehub/lobe-chat/blob/main/renovate.json

Gitmoji uses unbuild to bundle its package, simplifying build processes with optimized bundling & automated config.

Maintenance mode in Vercel: Reviewing Grida's code for detecting maintenance mode and redirecting to a static page when traffic spikes or app fails.

Grida Forms server.ts has multiple Server Component clients defined, using @supabase/supabase-js for custom schema configuration, differing from Supabase Auth Docs' @supabase/ssr import.

@manypkg/get-packages utility by Thinkmill helps devs build tools for monorepos with Yarn, Bolt, Lerna, pnpm or Rush support. Used in Changesets source code to get packages.

Util module's format API used in Changesets for string formatting, replacing placeholders with values and concatenating extra args as strings.

Changesets' Logger package silences log messages in tests using temporarilySilenceLogs function, which creates a log silencer and restores logging mechanism after test execution.

Changesets CLI package uses a dedicated logger package for consistent logging across the codebase. It imports picocolors to add color encoding to logs, improving feedback from CLI interactions.

ClientOptions interface in t3-env: Record<String, ZodType> with clientPrefix & client validation for prefixed env vars. Ensures server-side vars aren't exposed to clients.

Learn how to create custom error classes in JavaScript with consistent behavior for error handling using ExtendableError. Preserves error stack and name, ensuring reliable stack traces across environments.

T3 Env's EnvOptions type provides validation for environment variables using zod, ensuring type safety and error handling.

Shadcn/ui uses static metadata, while Lobechat uses dynamic metadata. Shadcn/ui configures metadata in a layout file with a static object, whereas Lobechat generates metadata dynamically using a function.

Biome.js is a toolchain for web projects, used in t3-env for formatting and linting purposes, with commands like format, lint, and check.

Nextra generates static documentation sites with Next.js & MDX. Configuring Nextra is simple, install packages, update config and create themes.config.jsx.

T3 env is a framework agnostic validation for type-safe environment variables, preventing invalid deployments with Zod. Install with `pnpm add @t3-oss/env-core zod` and define schema in `src/env.mjs`.

CodeMirror v6 dev env setup script processes CLI args in start() function, accessing command via process.argv[2] and executing corresponding cmdFn with apply()

CodeMirror uses individual repositories for each package, unlike monorepo projects. Packages are listed in bin/packages.js and loaded via loadPackages function.

Shadcn/ui uses execa, while CodeMirror uses child_process to execute CLI commands programmatically. Execa is optimized for programmatic usage and runs commands in scripts or libraries.

Postiz uses CopilotTextArea for AI-powered editing, but only if user has AI tier enabled. Otherwise, it defaults to MDEditor by @uiw/react-md-editor.

Open-source projects may have a separate "ee" folder with different licensing, like Cal.com's API or Documenso's software. Respect the licensing terms to avoid copyright issues.

LobeChat's Settings modal renders form fields dynamically, using Lobe-ui and antd components. The code is in Common.tsx, importing Form from @lobehub/ui.

LobeChat's tRPC ctx adds userId from Clerk auth, createContext returns object with context set, createContextInner function sets userId from params

Documenso's pdf file upload handled in Next.js app router, code found in documents/page.tsx and upload-document.tsx.

ts-pattern library used in Documenso source code for pattern matching and exhaustive checking, reducing code complexity and improving readability.

Uploaded file stored as string in database after base64 encoding and conversion to Uint8Array.

next-runtime-env dynamically injects environment variables into Next.js apps at runtime, adhering to the "build once, deploy many" principle. Use PublicEnvScript in root layout and env() function to access variables.

LobeChat uses Zustand for state management & DevTools for debugging. Action labels use Namespace to identify actions, ensuring Redux DevTools show accurate action names.

Supabase uses its own library for authentication, specifically @supabase/auth-js, in conjunction with its monorepo's common package.

Learn how hCaptcha helps detect bots in Open Source projects like Supabase & Chatwoot. See code examples of its usage in React, Vue.js and more at https://www.hcaptcha.com/