Merge pull request #32160 from unintellisense/master

[flatbuffers] support clear method on flatbuffer builder and bytebuffer

types/flatbuffers/flatbuffers-tests.ts

@@ -86,6 +86,27 @@ class Test {
     builder.writeInt16(a);
     return builder.offset();
   }
+
+  static testClear(builder: flatbuffers.Builder, a: number, b: number) {
+    const offsets: number[] = [];
+    const iterations = 100;
+    for (let i = 0; i < iterations; i++) {
+      const offset = Test.createTest(builder, a, b);
+      offsets.push(offset);
+      builder.clear();
+    }
+
+    let lastOffsetValue = offsets[0];
+    let sameValue = true;
+    for (let i = 1; i < offsets.length; i++) {
+      if (lastOffsetValue !== offsets[i]) {
+        sameValue = false;
+        return sameValue;
+      }
+      lastOffsetValue = offsets[i];
+    }
+    return sameValue;
+  }
 }
 
 class TestSimpleTableWithEnum {

types/flatbuffers/index.d.ts

@@ -42,6 +42,12 @@ declare global {
     class Builder {
       constructor(initial_size?: number);
 
+      /**
+       * Reset all the state in this FlatBufferBuilder
+       * so it can be reused to construct another buffer.
+       */
+      clear(): void;
+
       /**
        * In order to save space, fields that are set to their default value
        * don't get serialized into the buffer. Forcing defaults provides a
@@ -211,6 +217,8 @@ declare global {
 
       static allocate(byte_size: number): ByteBuffer;
 
+      clear(): void;
+
       bytes(): Uint8Array;
 
       position(): number;