What is wasm-component-ld?

Wasm-component-ld is a command line tool that links pieces of WebAssembly code together into a single, complete unit called a "component." WebAssembly (often called Wasm) is a way to run code fast in browsers and increasingly on servers, and components are a newer format that lets different Wasm modules talk to each other and work as one cohesive application. Think of it like stapling together chapters from different authors into one finished book that readers can open and use. When developers write a WebAssembly program, they often build it in pieces, maybe one module handles networking, another does math, and a third talks to a database. This tool takes those separate compiled modules and stitches them into one component that can be deployed and run as a unit. It resolves references between the pieces so that when module A calls a function in module B, everything lines up correctly at runtime. The people who would use this are developers building WebAssembly applications, especially those working with the newer component model that the broader Wasm ecosystem is moving toward. For example, someone building a serverless function that combines image processing code written in Rust with text parsing code written in C could use this linker to merge those pieces into one deployable component. Platform teams building Wasm-based deployment systems might also reach for it as part of their build pipelines. The project is written in Rust, which aligns with much of the modern WebAssembly tooling ecosystem. The README doesn't go into detail about specific flags, tradeoffs, or how it compares to other linking approaches, so it's hard to say much more about the technical decisions behind it. What's clear is that it serves a specific role in the Wasm toolchain: the linking step that turns separate modules into unified components.