boa_runtime 0.21.1

Example runtime for the Boa JavaScript engine.
Documentation 
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// Create a new scope to prevent global namespace poisoning.
{
  class SomeClass {
    constructor() {
      this.a = 42n;
      this.x = 1;
      this.repeat = this;
      this.repeatArray = [this, this, this];
    }
  }

  const buffer = new Uint8Array([1, 2, 3, 4]);
  const buffer2 = new Uint8Array([5, 6, 7, 8]);
  const buffer3 = new Uint32Array([9, 10, 11, 12]);
  const buffer4 = new Uint32Array([13, 14, 15, 16]);
  const arrayBuffer = new ArrayBuffer(16);
  new DataView(arrayBuffer).setUint32(0, 100);
  const arrayBuffer2 = new ArrayBuffer(10);
  new DataView(arrayBuffer2).setUint32(1, 101);

  const original = {
    some: new SomeClass(),
    buffer,
    bufferTArray: [buffer, buffer, buffer, buffer],
    buffer2,
    buffer2Array: [buffer2, buffer2, buffer2, buffer2],
    buffer3,
    buffer4,
    arrayBuffer,
    arrayBuffer2,
  };

  let dolly = structuredClone(original, {
    transfer: [buffer.buffer, buffer3.buffer, arrayBuffer2],
  });

  assertEq(buffer.byteLength, 0);
  assertEq(buffer2.byteLength, 4);
  assertEq(buffer3.byteLength, 0);
  assertThrows(() => {
    new Uint8Array(buffer);
  });
  assertThrows(() => {
    new Uint32Array(buffer3);
  });

  assertEq(dolly.buffer.constructor, Uint8Array);
  assertEq(dolly.buffer.byteLength, 4);
  assertEq(dolly.buffer2.constructor, Uint8Array);
  assertEq(dolly.buffer2.byteLength, 4);
  assertEq(dolly.buffer3.constructor, Uint32Array);
  assertEq(dolly.buffer3.byteLength, 16);
  assertEq(dolly.buffer4.constructor, Uint32Array);
  assertEq(dolly.buffer4.byteLength, 16);

  assertArrayEqual(dolly.buffer, [1, 2, 3, 4]);
  assertEq(dolly.buffer, dolly.bufferTArray[0]);
  assertEq(dolly.bufferTArray[0], dolly.bufferTArray[1]);
  assertEq(dolly.bufferTArray[0], dolly.bufferTArray[2]);
  assertEq(dolly.bufferTArray[0], dolly.bufferTArray[3]);

  assertArrayEqual(dolly.buffer2, [5, 6, 7, 8]);
  assertEq(dolly.buffer2Array[0], dolly.buffer2Array[1]);
  assertEq(dolly.buffer2Array[0], dolly.buffer2Array[2]);
  assertEq(dolly.buffer2Array[0], dolly.buffer2Array[3]);

  assertArrayEqual(dolly.buffer3, [9, 10, 11, 12]);
  assertArrayEqual(dolly.buffer4, [13, 14, 15, 16]);

  assertNEq(dolly.some.constructor, SomeClass);
  assertEq(dolly.some.a, 42n);
  assertEq(dolly.some.x, 1);
  assertEq(dolly.some.repeat, dolly.some);

  assertNEq(dolly.arrayBuffer, arrayBuffer);
  assertEq(dolly.arrayBuffer.byteLength, 16);
  assertEq(new DataView(dolly.arrayBuffer).getUint32(0), 100);
  assertNEq(dolly.arrayBuffer2, arrayBuffer2);
  assertEq(dolly.arrayBuffer2.byteLength, 10);
  assertEq(new DataView(dolly.arrayBuffer2).getUint32(1), 101);
}