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frontend/node_modules/@sveltejs/vite-plugin-svelte/src/utils/load-svelte-config.js

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+import { createRequire } from 'node:module';
+import path from 'node:path';
+import process from 'node:process';
+import fs from 'node:fs';
+import { pathToFileURL } from 'node:url';
+import { log } from './log.js';
+
+// used to require cjs config in esm.
+// NOTE dynamic import() cjs technically works, but timestamp query cache bust
+// have no effect, likely because it has another internal cache?
+/** @type {NodeRequire}*/
+let esmRequire;
+
+export const knownSvelteConfigNames = [
+	'svelte.config.js',
+	'svelte.config.cjs',
+	'svelte.config.mjs'
+];
+
+/**
+ * @param {string} filePath
+ * @param {number} timestamp
+ */
+async function dynamicImportDefault(filePath, timestamp) {
+	return await import(filePath + '?t=' + timestamp).then((m) => m.default);
+}
+
+/**
+ * @param {import('vite').UserConfig} [viteConfig]
+ * @param {Partial<import('../public.d.ts').Options>} [inlineOptions]
+ * @returns {Promise<Partial<import('../public.d.ts').SvelteConfig> | undefined>}
+ */
+export async function loadSvelteConfig(viteConfig, inlineOptions) {
+	if (inlineOptions?.configFile === false) {
+		return;
+	}
+	const configFile = findConfigToLoad(viteConfig, inlineOptions);
+	if (configFile) {
+		let err;
+		// try to use dynamic import for svelte.config.js first
+		if (configFile.endsWith('.js') || configFile.endsWith('.mjs')) {
+			try {
+				const result = await dynamicImportDefault(
+					pathToFileURL(configFile).href,
+					fs.statSync(configFile).mtimeMs
+				);
+				if (result != null) {
+					return {
+						...result,
+						configFile
+					};
+				} else {
+					throw new Error(`invalid export in ${configFile}`);
+				}
+			} catch (e) {
+				log.error(`failed to import config ${configFile}`, e);
+				err = e;
+			}
+		}
+		// cjs or error with dynamic import
+		if (!configFile.endsWith('.mjs')) {
+			try {
+				// identify which require function to use (esm and cjs mode)
+				const _require = import.meta.url
+					? (esmRequire ?? (esmRequire = createRequire(import.meta.url)))
+					: // eslint-disable-next-line no-undef
+						require;
+
+				// avoid loading cached version on reload
+				delete _require.cache[_require.resolve(configFile)];
+				const result = _require(configFile);
+				if (result != null) {
+					return {
+						...result,
+						configFile
+					};
+				} else {
+					throw new Error(`invalid export in ${configFile}`);
+				}
+			} catch (e) {
+				log.error(`failed to require config ${configFile}`, e);
+				if (!err) {
+					err = e;
+				}
+			}
+		}
+		// failed to load existing config file
+		throw err;
+	}
+}
+
+/**
+ * @param {import('vite').UserConfig | undefined} viteConfig
+ * @param {Partial<import('../public.d.ts').Options> | undefined} inlineOptions
+ * @returns {string | undefined}
+ */
+function findConfigToLoad(viteConfig, inlineOptions) {
+	const root = viteConfig?.root || process.cwd();
+	if (inlineOptions?.configFile) {
+		const abolutePath = path.isAbsolute(inlineOptions.configFile)
+			? inlineOptions.configFile
+			: path.resolve(root, inlineOptions.configFile);
+		if (!fs.existsSync(abolutePath)) {
+			throw new Error(`failed to find svelte config file ${abolutePath}.`);
+		}
+		return abolutePath;
+	} else {
+		const existingKnownConfigFiles = knownSvelteConfigNames
+			.map((candidate) => path.resolve(root, candidate))
+			.filter((file) => fs.existsSync(file));
+		if (existingKnownConfigFiles.length === 0) {
+			log.debug(`no svelte config found at ${root}`, undefined, 'config');
+			return;
+		} else if (existingKnownConfigFiles.length > 1) {
+			log.warn(
+				`found more than one svelte config file, using ${existingKnownConfigFiles[0]}. you should only have one!`,
+				existingKnownConfigFiles
+			);
+		}
+		return existingKnownConfigFiles[0];
+	}
+}