fix(json-pack): 🐛 support pre-packed values in CBOR codec

Author: streamich

src/json-pack/cbor/CborEncoder.ts

@@ -2,6 +2,7 @@ import {isFloat32} from '../../util/buffers/isFloat32';
 import {JsonPackExtension} from '../JsonPackExtension';
 import {CborEncoderFast} from './CborEncoderFast';
 import type {IWriter, IWriterGrowable} from '../../util/buffers';
+import {JsonPackValue} from '../JsonPackValue';
 
 export class CborEncoder<W extends IWriter & IWriterGrowable = IWriter & IWriterGrowable> extends CborEncoderFast<W> {
   /**
@@ -35,6 +36,9 @@ export class CborEncoder<W extends IWriter & IWriterGrowable = IWriter & IWriter
             return this.writeMap(value as Map<unknown, unknown>);
           case JsonPackExtension:
             return this.writeTag((<JsonPackExtension>value).tag, (<JsonPackExtension>value).val);
+          case JsonPackValue:
+            const buf = (value as JsonPackValue).val;
+            return this.writer.buf(buf, buf.length);
           default:
             return this.writeUnknown(value);
         }

src/json-pack/cbor/__tests__/CborEncoder.spec.ts

@@ -1,4 +1,5 @@
 import {Writer} from '../../../util/buffers/Writer';
+import {JsonPackValue} from '../../JsonPackValue';
 import {CborEncoder} from '../CborEncoder';
 import {decode} from 'cbor';
 
@@ -398,3 +399,15 @@ describe('tokens (simple values)', () => {
   testJsTokens(null);
   testJsTokens(undefined);
 });
+
+describe('JsonPackValue', () => {
+  test('can encode pre-packed value', () => {
+    const internal = encoder.encode({foo: 'bar'});
+    const val = new JsonPackValue(internal);
+    const data = {boo: [1, val, 2]};
+    const encoded = encoder.encode(data);
+    expect(decode(encoded)).toEqual({
+      boo: [1, {foo: 'bar'}, 2],
+    });
+  });
+});