Svelte at the Edge - Luke Edwards at Svelte Summit

Svelte at the Edge - Luke Edwards at Svelte Summit

Luke Edwards recently gave a talk at Svelte Summit 2020 in which he discussed running Svelte applications at the edge. Edwards demoed building and running a simple Svelte application with Cloudflare Workers and Google Cloud.

Luke Edwards recently gave a talk at Svelte Summit 2020 in which he discussed running Svelte applications at the edge. Edwards demoed building and running a simple Svelte application with Cloudflare Workers and Google Cloud.

Edwards first explained web workers and service workers. The Web Workers API allows developers to run a script in a background thread that is independent of the main thread. Web Workers are often used to run expensive computations without blocking the main thread. The main thread runs the event loop in which user interactions are processed. Blocking the main thread would thus negatively alter the responsiveness to user inputs. Web Workers are also used to run computations concurrently, and possibly in parallel on multi-core architectures.

Workers may themselves spawn new workers, as long as those workers are hosted at the same origin as the parent page. Workers are however limited by design in their operations. Workers cannot update the DOM to protect against the dangers of concurrent access to the DOM state. Workers cannot use some default methods and properties of the window object for similar reasons.

Workers, being on a separate thread and scope, rely on messaging for communication with the main thread. Both communicating parties send their messages using the postMessage() method, and respond to messages via the onmessage event handler. Message data is copied rather than shared. A web worker that runs the code contained in a worker.js file can be created in the main thread as follows:

/* main.js */

const myWorker = new Worker('worker.js');

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