feat: replace bfj with custom json utils

package.json

@@ -9,7 +9,6 @@
     "axe-core": "^4.10.2",
     "axios": "^1.7.4",
     "base64-stream": "^1.0.0",
-    "bfj": "^9.1.1",
     "cheerio": "^1.0.0-rc.12",
     "crawlee": "^3.11.1",
     "ejs": "^3.1.9",

src/json-utils.ts

@@ -0,0 +1,75 @@
+import { Readable } from 'stream';
+
+/**
+ * Recursively serialize an object (including arrays, Dates, etc.) into JSON chunks.
+ * This function is a generator that yields small JSON string segments.
+ */
+function* serializeObject<T>(
+  obj: T,
+  depth: number = 0,
+  indent: string = '  ',
+): Generator<string, void, undefined> {
+  const currentIndent = indent.repeat(depth);
+  const nextIndent = indent.repeat(depth + 1);
+
+  // 1. Handle Date
+  if (obj instanceof Date) {
+    yield JSON.stringify(obj.toISOString());
+    return;
+  }
+
+  // 2. Handle Array
+  if (Array.isArray(obj)) {
+    yield '[\n';
+    for (let i = 0; i < obj.length; i++) {
+      if (i > 0) {
+        // separate elements by comma + newline
+        yield ',\n';
+      }
+      yield nextIndent;
+      // recursively yield elements
+      yield* serializeObject(obj[i], depth + 1, indent);
+    }
+    yield `\n${currentIndent}]`;
+    return;
+  }
+
+  // 3. Handle Object
+  if (obj !== null && typeof obj === 'object') {
+    yield '{\n';
+    const entries = Object.entries(obj);
+    for (let i = 0; i < entries.length; i++) {
+      const [key, value] = entries[i];
+      if (i > 0) {
+        // separate properties by comma + newline
+        yield ',\n';
+      }
+      yield `${nextIndent}${JSON.stringify(key)}: `;
+      yield* serializeObject(value, depth + 1, indent);
+    }
+    yield `\n${currentIndent}}`;
+    return;
+  }
+
+  // 4. Handle primitives (string, number, boolean, null, etc.)
+  //    Use JSON.stringify() to ensure valid JSON.
+  yield JSON.stringify(obj);
+}
+
+/**
+ * Create a Readable stream that pushes JSON data by consuming our generator.
+ */
+export function objectToReadableStream<T>(obj: T, indent: string = '  '): Readable {
+  const generator = serializeObject(obj, 0, indent);
+
+  return new Readable({
+    read() {
+      const { value, done } = generator.next();
+      if (done) {
+        this.push(null); // Signal end of the stream
+      } else {
+        this.push(value);
+      }
+    },
+  });
+}

src/mergeAxeResults.ts

@@ -23,10 +23,10 @@ import {
 import { consoleLogger, silentLogger } from './logs.js';
 import itemTypeDescription from './constants/itemTypeDescription.js';
 import { oobeeAiHtmlETL, oobeeAiRules } from './constants/oobeeAi.js';
-import bfj from 'bfj';
 import zlib from 'zlib';
 import { Base64Encode } from 'base64-stream';
 import { pipeline } from 'stream/promises';
+import { objectToReadableStream } from './json-utils.js';
 
 export type ItemsInfo = {
   html: string;
@@ -452,16 +452,16 @@ function writeLargeJsonToFile(obj, filePath) {
 
 async function writeObjectToGzipBase64File(obj: object, outputFilePath: string) {
   console.log('Producing large gzipped base64 from object...');
-  const jsonReadable = await bfj.streamify(obj);
+  const jsonReadable = objectToReadableStream(obj);
   const gzipStream = zlib.createGzip({
     level: 6,
   });
   const base64EncodeStream = new Base64Encode();
   const fileWriteStream = fs.createWriteStream(outputFilePath, { encoding: 'utf8' });
   await pipeline(jsonReadable, gzipStream, base64EncodeStream, fileWriteStream);
-  const scanDataFileStats = fs.statSync(outputFilePath);
+  const fileStats = fs.statSync(outputFilePath);
   return {
-    fileSize: scanDataFileStats.size,
+    fileSize: fileStats.size,
   };
 }