How to use the @bentley/bentleyjs-core.JsonUtils.asInt function in @bentley/bentleyjs-core

return undefined;

      // NB: We make a copy of the sub-array because we don't want to pin the entire data array in memory.
      const numUint32s = (header.length - FeatureTableHeader.sizeInBytes) / 4;
      const packedFeatureArray = new Uint32Array(this._buffer.nextUint32s(numUint32s));
      if (this._buffer.isPastTheEnd)
        return undefined;

      let animNodesArray: Uint8Array | Uint16Array | Uint32Array | undefined;
      const animationNodes = JsonUtils.asObject(this._scene.animationNodes);
      if (undefined !== animationNodes) {
        const bytesPerId = JsonUtils.asInt(animationNodes.bytesPerId);
        const bufferViewId = JsonUtils.asString(animationNodes.bufferView);
        const bufferViewJson = this._bufferViews[bufferViewId];
        if (undefined !== bufferViewJson) {
          const byteOffset = JsonUtils.asInt(bufferViewJson.byteOffset);
          const byteLength = JsonUtils.asInt(bufferViewJson.byteLength);
          const bytes = this._binaryData.subarray(byteOffset, byteOffset + byteLength);
          switch (bytesPerId) {
            case 1:
              animNodesArray = new Uint8Array(bytes);
              break;
            case 2:
              // NB: A *copy* of the subarray.
              animNodesArray = Uint16Array.from(new Uint16Array(bytes.buffer, bytes.byteOffset, bytes.byteLength / 2));
              break;
            case 4:
              // NB: A *copy* of the subarray.
              animNodesArray = Uint32Array.from(new Uint32Array(bytes.buffer, bytes.byteOffset, bytes.byteLength / 4));
              break;
          }
        }

protected createDisplayParams(json: any): DisplayParams | undefined {
      const type = JsonUtils.asInt(json.type, DisplayParams.Type.Mesh);
      const lineColor = new ColorDef(JsonUtils.asInt(json.lineColor));
      const fillColor = new ColorDef(JsonUtils.asInt(json.fillColor));
      const width = JsonUtils.asInt(json.lineWidth);
      const linePixels = JsonUtils.asInt(json.linePixels, LinePixels.Solid);
      const fillFlags = JsonUtils.asInt(json.fillFlags, FillFlags.None);
      const ignoreLighting = JsonUtils.asBool(json.ignoreLighting);

      // Material will always contain its own texture if it has one
      const materialKey = json.materialId;
      const material = undefined !== materialKey ? this.materialFromJson(materialKey) : undefined;

      // We will only attempt to include the texture if material is undefined
      let textureMapping;
      if (!material) {
        const textureJson = json.texture;
        textureMapping = undefined !== textureJson ? this.textureMappingFromJson(textureJson) : undefined;

        if (undefined === textureMapping) {
          // Look for a gradient. If defined, create a texture mapping. No reason to pass the Gradient.Symb to the DisplayParams once we have the texture.

protected createDisplayParams(json: any): DisplayParams | undefined {
      const type = JsonUtils.asInt(json.type, DisplayParams.Type.Mesh);
      const lineColor = new ColorDef(JsonUtils.asInt(json.lineColor));
      const fillColor = new ColorDef(JsonUtils.asInt(json.fillColor));
      const width = JsonUtils.asInt(json.lineWidth);
      const linePixels = JsonUtils.asInt(json.linePixels, LinePixels.Solid);
      const fillFlags = JsonUtils.asInt(json.fillFlags, FillFlags.None);
      const ignoreLighting = JsonUtils.asBool(json.ignoreLighting);

      // Material will always contain its own texture if it has one
      const materialKey = json.materialId;
      const material = undefined !== materialKey ? this.materialFromJson(materialKey) : undefined;

      // We will only attempt to include the texture if material is undefined
      let textureMapping;
      if (!material) {
        const textureJson = json.texture;
        textureMapping = undefined !== textureJson ? this.textureMappingFromJson(textureJson) : undefined;

        if (undefined === textureMapping) {
          // Look for a gradient. If defined, create a texture mapping. No reason to pass the Gradient.Symb to the DisplayParams once we have the texture.

protected createDisplayParams(json: any): DisplayParams | undefined {
      const type = JsonUtils.asInt(json.type, DisplayParams.Type.Mesh);
      const lineColor = new ColorDef(JsonUtils.asInt(json.lineColor));
      const fillColor = new ColorDef(JsonUtils.asInt(json.fillColor));
      const width = JsonUtils.asInt(json.lineWidth);
      const linePixels = JsonUtils.asInt(json.linePixels, LinePixels.Solid);
      const fillFlags = JsonUtils.asInt(json.fillFlags, FillFlags.None);
      const ignoreLighting = JsonUtils.asBool(json.ignoreLighting);

      // Material will always contain its own texture if it has one
      const materialKey = json.materialId;
      const material = undefined !== materialKey ? this.materialFromJson(materialKey) : undefined;

      // We will only attempt to include the texture if material is undefined
      let textureMapping;
      if (!material) {
        const textureJson = json.texture;
        textureMapping = undefined !== textureJson ? this.textureMappingFromJson(textureJson) : undefined;

        if (undefined === textureMapping) {
          // Look for a gradient. If defined, create a texture mapping. No reason to pass the Gradient.Symb to the DisplayParams once we have the texture.
          const gradientProps = json.gradient as Gradient.SymbProps;

protected createDisplayParams(json: any): DisplayParams | undefined {
      const type = JsonUtils.asInt(json.type, DisplayParams.Type.Mesh);
      const lineColor = new ColorDef(JsonUtils.asInt(json.lineColor));
      const fillColor = new ColorDef(JsonUtils.asInt(json.fillColor));
      const width = JsonUtils.asInt(json.lineWidth);
      const linePixels = JsonUtils.asInt(json.linePixels, LinePixels.Solid);
      const fillFlags = JsonUtils.asInt(json.fillFlags, FillFlags.None);
      const ignoreLighting = JsonUtils.asBool(json.ignoreLighting);

      // Material will always contain its own texture if it has one
      const materialKey = json.materialId;
      const material = undefined !== materialKey ? this.materialFromJson(materialKey) : undefined;

      // We will only attempt to include the texture if material is undefined
      let textureMapping;
      if (!material) {
        const textureJson = json.texture;
        textureMapping = undefined !== textureJson ? this.textureMappingFromJson(textureJson) : undefined;

// NB: We make a copy of the sub-array because we don't want to pin the entire data array in memory.
      const numUint32s = (header.length - FeatureTableHeader.sizeInBytes) / 4;
      const packedFeatureArray = new Uint32Array(this._buffer.nextUint32s(numUint32s));
      if (this._buffer.isPastTheEnd)
        return undefined;

      let animNodesArray: Uint8Array | Uint16Array | Uint32Array | undefined;
      const animationNodes = JsonUtils.asObject(this._scene.animationNodes);
      if (undefined !== animationNodes) {
        const bytesPerId = JsonUtils.asInt(animationNodes.bytesPerId);
        const bufferViewId = JsonUtils.asString(animationNodes.bufferView);
        const bufferViewJson = this._bufferViews[bufferViewId];
        if (undefined !== bufferViewJson) {
          const byteOffset = JsonUtils.asInt(bufferViewJson.byteOffset);
          const byteLength = JsonUtils.asInt(bufferViewJson.byteLength);
          const bytes = this._binaryData.subarray(byteOffset, byteOffset + byteLength);
          switch (bytesPerId) {
            case 1:
              animNodesArray = new Uint8Array(bytes);
              break;
            case 2:
              // NB: A *copy* of the subarray.
              animNodesArray = Uint16Array.from(new Uint16Array(bytes.buffer, bytes.byteOffset, bytes.byteLength / 2));
              break;
            case 4:
              // NB: A *copy* of the subarray.
              animNodesArray = Uint32Array.from(new Uint32Array(bytes.buffer, bytes.byteOffset, bytes.byteLength / 4));
              break;
          }
        }
      }

private async readNamedTexture(namedTex: any, name: string): Promise {
      const bufferViewId = JsonUtils.asString(namedTex.bufferView);
      const bufferViewJson = 0 !== bufferViewId.length ? this._bufferViews[bufferViewId] : undefined;
      if (undefined === bufferViewJson)
        return Promise.resolve(undefined);

      const byteOffset = JsonUtils.asInt(bufferViewJson.byteOffset);
      const byteLength = JsonUtils.asInt(bufferViewJson.byteLength);
      if (0 === byteLength)
        return Promise.resolve(undefined);

      const bytes = this._binaryData.subarray(byteOffset, byteOffset + byteLength);
      const format = namedTex.format;
      const imageSource = new ImageSource(bytes, format);

      return imageElementFromImageSource(imageSource).then((image) => {
        if (this._isCanceled)
          return undefined;

        let textureType = RenderTexture.Type.Normal;
        if (JsonUtils.asBool(namedTex.isGlyph))
          textureType = RenderTexture.Type.Glyph;
        else if (JsonUtils.asBool(namedTex.isTileSection))
          textureType = RenderTexture.Type.TileSection;

private async readNamedTexture(namedTex: any): Promise {
      const bufferViewId = JsonUtils.asString(namedTex.bufferView);
      const bufferViewJson = 0 !== bufferViewId.length ? this._bufferViews[bufferViewId] : undefined;
      if (undefined === bufferViewJson)
        return Promise.resolve(undefined);

      const byteOffset = JsonUtils.asInt(bufferViewJson.byteOffset);
      const byteLength = JsonUtils.asInt(bufferViewJson.byteLength);
      if (0 === byteLength)
        return Promise.resolve(undefined);

      const bytes = this._binaryData.subarray(byteOffset, byteOffset + byteLength);
      const format = namedTex.format;
      const imageSource = new ImageSource(bytes, format);

      return imageElementFromImageSource(imageSource).then((image) => {
        if (this._isCanceled)
          return undefined;

        let textureType = RenderTexture.Type.Normal;
        if (JsonUtils.asBool(namedTex.isGlyph))
          textureType = RenderTexture.Type.Glyph;
        else if (JsonUtils.asBool(namedTex.isTileSection))
          textureType = RenderTexture.Type.TileSection;

return undefined;

      const name = JsonUtils.asString(json.name);
      const namedTex = 0 !== name.length ? this._namedTextures[name] : undefined;
      const texture = undefined !== namedTex ? namedTex.renderTexture as RenderTexture : undefined;
      if (undefined === texture) {
        assert(false, "bad texture mapping json");
        return undefined;
      }

      const paramsJson = json.params;
      const tf = paramsJson.transform;
      const paramProps: TextureMapping.ParamProps = {
        textureMat2x3: new TextureMapping.Trans2x3(tf[0][0], tf[0][1], tf[0][2], tf[1][0], tf[1][1], tf[1][2]),
        textureWeight: JsonUtils.asDouble(paramsJson.weight, 1.0),
        mapMode: JsonUtils.asInt(paramsJson.mode),
        worldMapping: JsonUtils.asBool(paramsJson.worldMapping),
      };

      return new TextureMapping(texture, new TextureMapping.Params(paramProps));
    }