Solid Refresh

npm i -D solid-refresh

yarn add -D solid-refresh

pnpm add -D solid-refresh

This project aims to provide HMR for Solid for various bundlers. It comes with a babel plugin and a runtime. Over time I hope to add different bundlers. Today it supports:

• Vite (with option bundler: "vite")
• Snowpack (with option bundler: "esm")
• Webpack (for strict ESM, use option bundler: "webpack5")
• Nollup

Setup

Vite

solid-refresh is already built into vite-plugin-solid.

Webpack & Rspack

You can read the following guides first, respectively:

• Webpack
• Rspack
• Rspack SolidJS guide

> [!NOTE] > Rspack has HMR already enabled by default. The guide only tells you how to disable it or run the dev server on a proxy server.

Requires the use of babel-loader. Add the following to .babelrc:

{
  "env": {
    "development": {
      "plugins": ["solid-refresh/babel"]
    }
  }
}

If you're using strict ESM a.k.a. import.meta.webpackHot:

{
  "env": {
    "development": {
      "plugins": [["solid-refresh/babel", {
        "bundler": "webpack5" // or "rspack-esm"
      }]]
    }
  }
}

In your webpack config, be sure to have the following options:

devServer: {
  liveReload: false,
  hot: true,
}

Parcel

Add the following to .babelrc:

{
  "env": {
    "development": {
      "presets": [
        ["babel-preset-solid"]
      ],
      "plugins": [
        ["module:solid-refresh/babel"]
      ]
    },
    "production": {
      "presets": [
        ["babel-preset-solid"]
      ],
      "plugins": [
      ]
    }
  }
}

Parcel doesn't enable package exports by default, which allows loading the dev version of SolidJS. To enable it, the following must be added in package.json (in accordance with this document):

{
  "@parcel/resolver-default": {
    "packageExports": true
  }
}

Nollup

Requires the use of @rollup/plugin-babel. Add the following to .babelrc:

{
  "env": {
    "development": {
      "plugins": ["solid-refresh/babel"]
    }
  }
}

Snowpack

Requires the use of @snowpack/plugin-babel. Add the following to .babelrc:

{
  "env": {
    "development": {
      "plugins": ["solid-refresh/babel", { "bundler": "esm" }]
    }
  }
}

Other dev servers

• wmr
  • SolidJS is yet to be supported or isn't clear yet. It will use the same config as Snowpack.
• rollup-plugin-hot
  • The library uses almost an ESM HMR-like API however it behaves the same way as Parcel. Supporting this library is still unclear.
• @web/dev-server
  • The library supports HMR through their HMR Plugin. The HMR interface is basically the same as Snowpack's.

Development Environment

In any case, your build system needs to support conditional exports and have the development condition set.

> [!WARNING] > In some standard HMR implementations, this may cause your app to reload the full page if the development environment isn't properly set!

How it works

The babel plugin will transform components with matching Pascal-cased names (indicating that they are components). This detection is supported in variable declarations, function declarations and named exports:

// This works
function Foo() {
  return <h1>Hello Foo</h1>;
}

// This also works
const Bar = () =&gt; <h1>Hello Bar</h1>;

The components are wrapped and memoized. When the module receives an update, it replaces the old components from the old module with the new components.

Automatic Render Cleanup

The plugin automatically handles cleanups for unhandled render and hydrate calls from solid-js/web.

You can disable this feature entirely through the option "fixRender": false.

Pragma

On a per file basis, use comments at top of file to opt out(change moves up to parent):

/* @refresh skip */

Or force reload:

/* @refresh reload */

Limitations

• Preserving state is applied partially.
• No HOC support.

Custom render/createContext

You can define custom render/createContext calls by using the imports option

{
  "imports": [
    {
      // Only either "render" or "createContext"
      "type": "render",
      // Import identifier
      "name": "render",
      // Kind of import (named or default)
      "kind": "named",
      // Module source
      "source": "my-solid-library"
    }
  ],
}

Other Configs

Granular Mode

Granular mode for HMR (which allows independent HMR for components and templates) is enabled by default. You can disable this by adding granular: false.

JSX HMR

JSX, by default, is moved to a separate component to perform granular HMR. To disable this, add jsx: false.