feat(smartjson): Add JSONL stringify and ordering comparator; fix empty buffer handling; refactor Smartjson folding/enfolding

changelog.md

@@ -1,5 +1,15 @@
 # Changelog
 
+## 2025-09-12 - 5.1.0 - feat(smartjson)
+Add JSONL stringify and ordering comparator; fix empty buffer handling; refactor Smartjson folding/enfolding
+
+- Export stringifyJsonL(items: any[]) and add README documentation for JSONL stringification
+- stringify(obj, simpleOrderArray) now derives a stable-json comparator from simpleOrderArray when no custom cmp is provided, ensuring predictable key ordering
+- Fix buffer handling: empty Uint8Array values are preserved (no longer serialized to an empty string) and encoding/decoding logic improved
+- Refactor Smartjson.enfoldFromObject to safely use saveableProperties and avoid repeated property access
+- Simplify Smartjson.foldToObject to delegate to an internal foldToObjectInternal with cycle detection and correct nested instance handling
+- Add unit tests for empty buffers, JSONL parse/stringify, deepEqualJsonLStrings, and simpleOrderArray comparator behavior
+
 ## 2025-09-12 - 5.0.21 - fix(Smartjson)
 Cross-platform buffer/base64 handling, safer folding with cycle detection, parsing fixes, docs and dependency updates
 

readme.md

@@ -99,6 +99,13 @@ const jsonLines = `{"event":"start","time":1234}
 const events = smartjson.parseJsonL(jsonLines);
 // Result: Array of parsed objects
 
+// Produce JSONL from objects
+const jsonlOut = smartjson.stringifyJsonL([
+  { event: 'start', time: 1234 },
+  { event: 'data', value: 42 },
+  { event: 'end', time: 5678 }
+]);
+
 // Compare JSON Lines data
 const jsonL1 = `{"id":1}\n{"id":2}`;
 const jsonL2 = `{"id":1}\n{"id":2}`;
@@ -308,6 +315,7 @@ class AppConfig extends Smartjson {
 - `stringifyBase64(obj: any): string` - Encode JSON as base64
 - `parseBase64(base64String: string): any` - Decode base64 JSON
 - `parseJsonL(jsonLinesString: string): any[]` - Parse JSON Lines format
+- `stringifyJsonL(items: any[]): string` - Stringify array to JSON Lines
 - `deepEqualObjects(obj1: any, obj2: any): boolean` - Deep comparison of objects
 - `deepEqualJsonLStrings(jsonL1: string, jsonL2: string): boolean` - Compare JSON Lines strings
 
@@ -365,4 +373,4 @@ Registered at District court Bremen HRB 35230 HB, Germany
 
 For any legal inquiries or if you require further information, please contact us via email at hello@task.vc.
 
-By using this repository, you acknowledge that you have read this section, agree to comply with its terms, and understand that the licensing of the code does not imply endorsement by Task Venture Capital GmbH of any derivative works.
+By using this repository, you acknowledge that you have read this section, agree to comply with its terms, and understand that the licensing of the code does not imply endorsement by Task Venture Capital GmbH of any derivative works.

test/test.both.ts

@@ -72,4 +72,36 @@ tap.test('should work with buffers', async () => {
   expect(text).toEqual('hello');
 });
 
+tap.test('should handle empty buffers', async () => {
+  const someObject = { empty: new Uint8Array([]) };
+  const json = smartjson.stringify(someObject);
+  const parsed = smartjson.parse(json);
+  expect(parsed.empty).toBeInstanceOf(Uint8Array);
+  expect(parsed.empty.length).toEqual(0);
+});
+
+tap.test('should parse and stringify JSONL', async () => {
+  const items = [
+    { id: 1, name: 'a' },
+    { id: 2, name: 'b' }
+  ];
+  const jsonl = smartjson.stringifyJsonL(items);
+  const parsed = smartjson.parseJsonL(jsonl);
+  expect(parsed).toEqual(items);
+});
+
+tap.test('should deep-compare JSONL strings', async () => {
+  const a = '{"id":2,"name":"b"}\n{"id":1,"name":"a"}';
+  const b = '{"id":2,"name":"b"}\n{"id":1,"name":"a"}';
+  expect(smartjson.deepEqualJsonLStrings(a, b)).toEqual(true);
+});
+
+tap.test('should respect simpleOrderArray comparator', async () => {
+  const obj = { c: 3, a: 1, b: 2 };
+  const ordered = smartjson.stringify(obj, ['b', 'a']);
+  // ensure keys b, a come before c
+  expect(ordered.indexOf('"b"')).toBeLessThan(ordered.indexOf('"a"'));
+  expect(ordered.indexOf('"a"')).toBeLessThan(ordered.indexOf('"c"'));
+});
+
 tap.start();

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartjson',
-  version: '5.0.21',
+  version: '5.1.0',
   description: 'A library for handling typed JSON data, providing functionalities for parsing, stringifying, and working with JSON objects, including support for encoding and decoding buffers.'
 }

ts/bufferhandling.ts

@@ -52,11 +52,7 @@ const replacer: TParseReplacer = (key, value) => {
 
     // Handle IBufferLike objects with a .data property
     if ('data' in value && isArray(value.data)) {
-      if (value.data.length > 0) {
+      bufferData = new Uint8Array(value.data);
-        bufferData = new Uint8Array(value.data);
-      } else {
-        return ''; // Return empty string for empty data arrays
-      }
     } 
     // Handle Uint8Array directly
     else if (value instanceof Uint8Array) {

ts/index.ts

@@ -22,6 +22,10 @@ export const parseJsonL = (jsonlData: string): JsonObject[] => {
   return parsedData;
 }
 
+export const stringifyJsonL = (items: any[]): string => {
+  return items.map((item) => stringify(item)).join('\n');
+}
+
 /**
  *
  * @param objArg
@@ -34,7 +38,20 @@ export const stringify = (
 ): string => {
   const bufferedJson = bufferhandling.stringify(objArg);
   objArg = JSON.parse(bufferedJson);
-  let returnJson = plugins.stableJson(objArg, optionsArg);
+  // derive a simple comparator from simpleOrderArray if provided and no custom cmp supplied
+  let options = { ...optionsArg };
+  if (simpleOrderArray && !options.cmp) {
+    const order = new Map<string, number>();
+    simpleOrderArray.forEach((key, idx) => order.set(key, idx));
+    options.cmp = (a, b) => {
+      const aIdx = order.has(a.key) ? (order.get(a.key) as number) : Number.POSITIVE_INFINITY;
+      const bIdx = order.has(b.key) ? (order.get(b.key) as number) : Number.POSITIVE_INFINITY;
+      if (aIdx !== bIdx) return aIdx - bIdx;
+      // fallback to lexicographic order for stable behavior
+      return a.key < b.key ? -1 : a.key > b.key ? 1 : 0;
+    };
+  }
+  let returnJson = plugins.stableJson(objArg, options);
   return returnJson;
 };
 
@@ -62,9 +79,10 @@ export class Smartjson {
    */
   public static enfoldFromObject<T extends typeof Smartjson>(this: T, objectArg: any): InstanceType<T> {
     const newInstance = new this() as InstanceType<T>;
+    const saveables: string[] = (newInstance as any).saveableProperties || [];
     for (const keyName in objectArg) {
-      if (newInstance.saveableProperties.indexOf(keyName) !== -1) {
+      if (saveables.indexOf(keyName) !== -1) {
-        newInstance[keyName] = objectArg[keyName];
+        (newInstance as any)[keyName] = objectArg[keyName];
       }
     }
     return newInstance;
@@ -88,26 +106,9 @@ export class Smartjson {
    * folds a class into an object
    */
   public foldToObject() {
-    const newFoldedObject: { [key: string]: any } = {};
     const trackSet = new Set<Smartjson>();
-    const foldValue = (val: any): any => {
+    trackSet.add(this);
-      if (val instanceof Smartjson) {
+    return this.foldToObjectInternal(trackSet);
-        if (trackSet.has(val)) {
-          throw new Error('cycle detected');
-        }
-        trackSet.add(val);
-        return val.foldToObjectInternal(trackSet);
-      }
-      if (Array.isArray(val)) {
-        return val.map((item) => foldValue(item));
-      }
-      return plugins.lodashCloneDeep(val);
-    };
-    for (const keyName of this.saveableProperties) {
-      const value = this[keyName];
-      newFoldedObject[keyName] = foldValue(value);
-    }
-    return newFoldedObject;
   }
 
   private foldToObjectInternal(trackSet: Set<Smartjson>) {
@@ -125,7 +126,8 @@ export class Smartjson {
       }
       return plugins.lodashCloneDeep(val);
     };
-    for (const keyName of this.saveableProperties) {
+    const props: string[] = (this as any).saveableProperties || [];
+    for (const keyName of props) {
       const value = this[keyName];
       result[keyName] = foldValue(value);
     }