initial commit

fluxer_app/scripts/build/utils/sourcemaps.ts

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+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import * as fs from 'node:fs';
+import * as path from 'node:path';
+
+async function fileExists(filePath: string): Promise<boolean> {
+	try {
+		await fs.promises.access(filePath);
+		return true;
+	} catch {
+		return false;
+	}
+}
+
+async function traverseDir(dir: string, callback: (filePath: string) => Promise<void>): Promise<void> {
+	const entries = await fs.promises.readdir(dir, {withFileTypes: true});
+	await Promise.all(
+		entries.map(async (entry) => {
+			const entryPath = path.join(dir, entry.name);
+			if (entry.isDirectory()) {
+				await traverseDir(entryPath, callback);
+				return;
+			}
+			await callback(entryPath);
+		}),
+	);
+}
+
+export async function cleanEmptySourceMaps(dir: string): Promise<void> {
+	if (!(await fileExists(dir))) {
+		return;
+	}
+
+	await traverseDir(dir, async (filePath) => {
+		if (!filePath.endsWith('.js.map')) {
+			return;
+		}
+
+		let parsed: unknown;
+		try {
+			const raw = await fs.promises.readFile(filePath, 'utf-8');
+			parsed = JSON.parse(raw);
+		} catch {
+			return;
+		}
+
+		if (typeof parsed !== 'object' || parsed === null) {
+			return;
+		}
+
+		const sources = (parsed as {sources?: Array<unknown>}).sources ?? [];
+		if (Array.isArray(sources) && sources.length > 0) {
+			return;
+		}
+
+		await fs.promises.rm(filePath, {force: true});
+
+		const jsPath = filePath.slice(0, -4);
+		if (!(await fileExists(jsPath))) {
+			return;
+		}
+
+		const jsContent = await fs.promises.readFile(jsPath, 'utf-8');
+		const cleaned = jsContent.replace(/(?:\r?\n)?\/\/# sourceMappingURL=.*$/, '');
+		if (cleaned !== jsContent) {
+			await fs.promises.writeFile(jsPath, cleaned);
+		}
+	});
+}