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102 lines
3.2 KiB
TypeScript
102 lines
3.2 KiB
TypeScript
import { readFileSync } from 'fs';
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import { compile, preprocess } from 'svelte/compiler';
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import { DepOptimizationOptions } from 'vite';
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import { Compiled } from './compile';
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import { log } from './log';
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import { CompileOptions, ResolvedOptions } from './options';
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import { toESBuildError } from './error';
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import { StatCollection } from './vite-plugin-svelte-stats';
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type EsbuildOptions = NonNullable<DepOptimizationOptions['esbuildOptions']>;
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type EsbuildPlugin = NonNullable<EsbuildOptions['plugins']>[number];
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export const facadeEsbuildSveltePluginName = 'vite-plugin-svelte:facade';
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export function esbuildSveltePlugin(options: ResolvedOptions): EsbuildPlugin {
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return {
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name: 'vite-plugin-svelte:optimize-svelte',
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setup(build) {
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// Skip in scanning phase as Vite already handles scanning Svelte files.
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// Otherwise this would heavily slow down the scanning phase.
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if (build.initialOptions.plugins?.some((v) => v.name === 'vite:dep-scan')) return;
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const svelteExtensions = (options.extensions ?? ['.svelte']).map((ext) => ext.slice(1));
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const svelteFilter = new RegExp(`\\.(` + svelteExtensions.join('|') + `)(\\?.*)?$`);
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let statsCollection: StatCollection | undefined;
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build.onStart(() => {
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statsCollection = options.stats?.startCollection('prebundle libraries', {
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logResult: (c) => c.stats.length > 1
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});
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});
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build.onLoad({ filter: svelteFilter }, async ({ path: filename }) => {
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const code = readFileSync(filename, 'utf8');
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try {
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const contents = await compileSvelte(options, { filename, code }, statsCollection);
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return { contents };
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} catch (e) {
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return { errors: [toESBuildError(e, options)] };
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}
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});
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build.onEnd(() => {
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statsCollection?.finish();
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});
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}
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};
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}
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async function compileSvelte(
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options: ResolvedOptions,
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{ filename, code }: { filename: string; code: string },
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statsCollection?: StatCollection
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): Promise<string> {
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let css = options.compilerOptions.css;
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if (css !== 'none') {
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// TODO ideally we'd be able to externalize prebundled styles too, but for now always put them in the js
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css = 'injected';
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}
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const compileOptions: CompileOptions = {
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...options.compilerOptions,
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css,
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filename,
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format: 'esm',
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generate: 'dom'
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};
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let preprocessed;
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if (options.preprocess) {
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try {
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preprocessed = await preprocess(code, options.preprocess, { filename });
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} catch (e) {
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e.message = `Error while preprocessing ${filename}${e.message ? ` - ${e.message}` : ''}`;
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throw e;
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}
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if (preprocessed.map) compileOptions.sourcemap = preprocessed.map;
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}
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const finalCode = preprocessed ? preprocessed.code : code;
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const dynamicCompileOptions = await options.experimental?.dynamicCompileOptions?.({
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filename,
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code: finalCode,
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compileOptions
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});
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if (dynamicCompileOptions && log.debug.enabled) {
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log.debug(`dynamic compile options for ${filename}: ${JSON.stringify(dynamicCompileOptions)}`);
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}
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const finalCompileOptions = dynamicCompileOptions
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? {
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...compileOptions,
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...dynamicCompileOptions
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}
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: compileOptions;
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const endStat = statsCollection?.start(filename);
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const compiled = compile(finalCode, finalCompileOptions) as Compiled;
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if (endStat) {
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endStat();
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}
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return compiled.js.code + '//# sourceMappingURL=' + compiled.js.map.toUrl();
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}
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