initial commit

.gitignore

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+node_modules/
+dist/
+.astro/
+package-lock.json
+
+*~
+*swo
+*swp
+

index.js

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+import { AstroIntegration } from 'astro';
+import { readFile, writeFile } from 'node:fs/promises';
+import { fileURLToPath } from 'node:url';
+import path from 'node:path';
+import { randomUUID } from "node:crypto";
+
+/**
+ * @type {Array<string>}
+ */
+let assets = [];
+
+/**
+ * @typedef {{
+ *  assetCachePrefix?: string,
+ *  assetCacheVersionID?: string,
+ *  path: string,
+ * }} ServiceWorkerConfig
+ */
+
+const plugin_dir = path.resolve(path.dirname('.'));
+
+/**
+ * 
+ * @param {ServiceWorkerConfig} config 
+ * @returns {AstroIntegration}
+ */
+export default function serviceWorker(config) {
+    let {
+        assetCachePrefix,
+        assetCacheVersionID = randomUUID(),
+        path: serviceWorkerPath
+    } = config;
+
+    console.log('[astro-sw] dir', plugin_dir)
+
+    return {
+        'name': 'astro-sw',
+        'hooks': {
+            'astro:build:ssr': ({ manifest }) => {
+                assets = manifest.assets.filter(ass => !ass.includes('sw.js'))
+            },
+            'astro:build:done': async ({ dir }) => {
+                const outFile = fileURLToPath(new URL('./sw.js', dir));
+                let originalScript;
+                try {
+                    const __dirname = path.resolve(path.dirname('.'));
+                    const swPath = path.join(__dirname, serviceWorkerPath ?? '');
+                    console.log('[astro-sw] Using service worker:', swPath);
+                    originalScript = await readFile(swPath);
+                } catch {
+                    throw Error('[astro-sw] ERROR: service worker script not found!')
+                }
+                const assetsDeclaration = `const __assets = ${JSON.stringify(assets)};\n`;
+                const versionDeclaration = `const __version = ${JSON.stringify(assetCacheVersionID)};\n`;
+                const prefixDeclaration = `const __prefix = ${JSON.stringify(assetCachePrefix)};\n`;
+
+                await writeFile(
+                    outFile,
+                    assetsDeclaration + versionDeclaration + prefixDeclaration + originalScript
+                );
+            }
+        }
+    }
+};

package.json

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+{
+  "name": "@ayco/astro-sw",
+  "version": "0.0.1",
+  "description": "Simple Astro integration to use your own authored service-worker",
+  "main": "index.ts",
+  "engines": {
+    "node": ">=18.0.0"
+  },
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "withastro",
+    "perf"
+  ],
+  "author": "Ayo Ayco",
+  "license": "MIT",
+  "devDependencies": {
+    "astro": "^4.13.1"
+  }
+}