How to use the @here/harp-materials.LineCapsDefinitions.hasOwnProperty function in @here/harp-materials

) {
                        const tileSize = lineMaterial.uniforms.tileSize;
                        const size = new THREE.Vector3();
                        tile.boundingBox.getSize(size);
                        tileSize.value.x = size.x;
                        tileSize.value.y = size.y;
                        lineMaterial.defines.TILE_CLIP = 1;
                    }

                    if (bufferGeometry.getAttribute("color")) {
                        lineMaterial.defines.USE_COLOR = 1;
                    }

                    if (
                        technique.caps !== undefined &&
                        LineCapsDefinitions.hasOwnProperty(technique.caps)
                    ) {
                        lineMaterial.defines[LineCapsDefinitions[technique.caps]] = 1;
                    }
                }

                // Add the solid line outlines as a separate object.
                const hasSolidLinesOutlines: boolean =
                    isSolidLineTechnique(technique) && technique.secondaryWidth !== undefined;

                const object = new ObjectCtor(bufferGeometry, material);
                object.renderOrder = technique.renderOrder!;

                if (group.renderOrderOffset !== undefined) {
                    object.renderOrder += group.renderOrderOffset;
                }