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index.ts
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index.ts
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import type { Plugin, ResolvedConfig } from "vite";
import type { FilterPattern } from "@rollup/pluginutils";
import type { ParserPlugin, ParserOptions } from "@babel/parser";
import type { TransformOptions } from "@babel/core";
import prefresh from "@prefresh/vite";
import { preactDevtoolsPlugin } from "./devtools.js";
import { createFilter, parseId } from "./utils.js";
import { transformAsync } from "@babel/core";
export type BabelOptions = Omit<
TransformOptions,
| "ast"
| "filename"
| "root"
| "sourceFileName"
| "sourceMaps"
| "inputSourceMap"
>;
export interface PreactPluginOptions {
/**
* Inject devtools bridge in production bundle instead of only in development mode.
* @default false
*/
devtoolsInProd?: boolean;
/**
* Whether to use Preact devtools
* @default true
*/
devToolsEnabled?: boolean;
/**
* Whether to use prefresh HMR
* @default true
*/
prefreshEnabled?: boolean;
/**
* RegExp or glob to match files to be transformed
*/
include?: FilterPattern;
/**
* RegExp or glob to match files to NOT be transformed
*/
exclude?: FilterPattern;
/**
* Babel configuration applied in both dev and prod.
*/
babel?: BabelOptions;
}
export interface PreactBabelOptions extends BabelOptions {
plugins: Extract<BabelOptions["plugins"], any[]>;
presets: Extract<BabelOptions["presets"], any[]>;
overrides: Extract<BabelOptions["overrides"], any[]>;
parserOpts: ParserOptions & {
plugins: Extract<ParserOptions["plugins"], any[]>;
};
}
// Taken from https://github.com/vitejs/vite/blob/main/packages/plugin-react/src/index.ts
function preactPlugin({
devtoolsInProd,
devToolsEnabled,
prefreshEnabled,
include,
exclude,
babel,
}: PreactPluginOptions = {}): Plugin[] {
let config: ResolvedConfig;
let babelOptions = {
babelrc: false,
configFile: false,
...babel,
} as PreactBabelOptions;
babelOptions.plugins ||= [];
babelOptions.presets ||= [];
babelOptions.overrides ||= [];
babelOptions.parserOpts ||= {} as any;
babelOptions.parserOpts.plugins ||= [];
const shouldTransform = createFilter(
include || [/\.[tj]sx?$/],
exclude || [/node_modules/],
);
devToolsEnabled = devToolsEnabled ?? true;
prefreshEnabled = prefreshEnabled ?? true;
const jsxPlugin: Plugin = {
name: "vite:preact-jsx",
enforce: "pre",
config() {
return {
optimizeDeps: {
include: ["preact/jsx-runtime", "preact/jsx-dev-runtime"],
},
};
},
configResolved(resolvedConfig) {
config = resolvedConfig;
},
async transform(code, url) {
// Ignore query parameters, as in Vue SFC virtual modules.
const { id } = parseId(url);
if (!shouldTransform(id)) return;
const parserPlugins = [
"importMeta",
// This plugin is applied before esbuild transforms the code,
// so we need to enable some stage 3 syntax that is supported in
// TypeScript and some environments already.
"topLevelAwait",
"classProperties",
"classPrivateProperties",
"classPrivateMethods",
!id.endsWith(".ts") && "jsx",
/\.tsx?$/.test(id) && "typescript",
].filter(Boolean) as ParserPlugin[];
const result = await transformAsync(code, {
...babelOptions,
ast: true,
root: config.root,
filename: id,
parserOpts: {
...babelOptions.parserOpts,
sourceType: "module",
allowAwaitOutsideFunction: true,
plugins: parserPlugins,
},
generatorOpts: {
...babelOptions.generatorOpts,
decoratorsBeforeExport: true,
},
plugins: [
...babelOptions.plugins,
[
config.isProduction
? "@babel/plugin-transform-react-jsx"
: "@babel/plugin-transform-react-jsx-development",
{
runtime: "automatic",
importSource: "preact",
},
],
...(config.isProduction ? [] : ["babel-plugin-transform-hook-names"]),
],
sourceMaps: true,
inputSourceMap: false as any,
});
// NOTE: Since no config file is being loaded, this path wouldn't occur.
if (!result) return;
return {
code: result.code || code,
map: result.map,
};
},
};
return [
{
name: "preact:config",
config() {
return {
resolve: {
alias: {
"react-dom/test-utils": "preact/test-utils",
"react-dom": "preact/compat",
react: "preact/compat",
},
},
};
},
},
jsxPlugin,
...(devToolsEnabled
? [
preactDevtoolsPlugin({
injectInProd: devtoolsInProd,
shouldTransform,
}),
]
: []),
...(prefreshEnabled ? [prefresh({ include, exclude })] : []),
];
}
export default preactPlugin;
export { preactPlugin as preact };