A device driver is the bridge between software and physical hardware. On a microcontroller or a kernel, the CPU communicates with peripherals—UART controllers, GPIO banks, timers, network cards—by reading from and writing to fixed memory addresses. These are not ordinary RAM. Reading a status register might clear a pending interrupt. Writing a data register might…
Writing an operating system kernel in Rust requires abandoning the comforts of the standard library. There is no main function injected by the runtime, no heap allocator provided by the system, no file system, and no underlying OS to handle panics or thread local storage. The kernel is the system. Rust’s no_std attribute is the…
The .yarnrc.yml file is the central configuration hub for Yarn Berry (2+). Every project-level setting—how packages are linked, where the cache lives, which registry is queried, how workspaces behave—lives in this single YAML file. Unlike package.json, which is shared with npm and the broader Node.js ecosystem, .yarnrc.yml is Yarn-specific and is the only file that…
Zero-Installs is a Yarn pattern that eliminates the need to run yarn install after cloning a repository or switching branches. It works by committing the install artifacts—the PnP loader files and the project-local package cache—directly to version control. The result is a repository that is immediately runnable on checkout, with no network requests and no…
Every package manager before Yarn PnP relied on the same fundamental mechanism: placing files into a node_modules directory and letting Node.js walk up the directory tree to find them. Yarn Plug’n’Play discards this model entirely. Instead of copying packages into a folder tree, PnP generates a single loader file—.pnp.cjs—that contains a complete map of the…
A monorepo stores multiple packages in a single repository. Yarn Workspaces is the mechanism that makes this practical: it installs all packages’ dependencies together, links packages to each other without publishing to a registry, and provides commands to run scripts across the entire project. In Yarn Berry (2+), the feature set expands significantly with the…
A project’s package.json is not just a dependency manifest. It is also a command registry. The scripts field defines named commands that can be invoked with a short alias, and Yarn provides a resolution layer that decides whether a given name refers to a script, a taskfile, or a binary from a dependency. In Yarn…
A pull request opens a conversation, but a code review is the structured evaluation of the proposed changes. It is not just a place to leave comments; it is a workflow gate that determines whether code enters the main branch. GitHub provides specific tools for this: inline comments on specific lines, suggested changes that can…
A pull request is the mechanism that turns a private branch into a proposal. It is not a Git operation—Git itself has no concept of a pull request. It is a GitHub feature that wraps a branch in a review workflow: discussion, automated checks, and a merge gate. For a contributor, a pull request is…
A repository is more than code. It is a workspace where bugs are reported, features are proposed, and work is tracked. GitHub Issues provides the infrastructure for that work: a flexible item type for discussion and planning . But an unstructured issue tracker becomes noise. Labels categorize issues by type and priority. Milestones group them…