export type TypedArray = Int8Array | Uint8Array | Uint8ClampedArray | Int16Array | Uint16Array | Int32Array | Uint32Array | Float32Array | Float64Array;
export declare function isTypedArray(x: any): x is TypedArray;
/**
 * WebGPU does not support RGB texture, so we need to convert RGB to RGBA
 * @see https://github.com/antvis/L7/pull/2262
 */
export declare function extend3ChannelsTo4(array: Float32Array, valueToInsert: number): Float32Array;