CompressedPixelFormat:
    | typeof RGB_S3TC_DXT1_Format
    | typeof RGBA_S3TC_DXT1_Format
    | typeof RGBA_S3TC_DXT3_Format
    | typeof RGBA_S3TC_DXT5_Format
    | typeof RGB_PVRTC_4BPPV1_Format
    | typeof RGB_PVRTC_2BPPV1_Format
    | typeof RGBA_PVRTC_4BPPV1_Format
    | typeof RGBA_PVRTC_2BPPV1_Format
    | typeof RGB_ETC1_Format
    | typeof RGB_ETC2_Format
    | typeof RGBA_ETC2_EAC_Format
    | typeof RGBA_ASTC_4x4_Format
    | typeof RGBA_ASTC_5x4_Format
    | typeof RGBA_ASTC_5x5_Format
    | typeof RGBA_ASTC_6x5_Format
    | typeof RGBA_ASTC_6x6_Format
    | typeof RGBA_ASTC_8x5_Format
    | typeof RGBA_ASTC_8x6_Format
    | typeof RGBA_ASTC_8x8_Format
    | typeof RGBA_ASTC_10x5_Format
    | typeof RGBA_ASTC_10x6_Format
    | typeof RGBA_ASTC_10x8_Format
    | typeof RGBA_ASTC_10x10_Format
    | typeof RGBA_ASTC_12x10_Format
    | typeof RGBA_ASTC_12x12_Format
    | typeof RGBA_BPTC_Format
    | typeof RGB_BPTC_SIGNED_Format
    | typeof RGB_BPTC_UNSIGNED_Format
    | typeof RED_RGTC1_Format
    | typeof SIGNED_RED_RGTC1_Format
    | typeof RED_GREEN_RGTC2_Format
    | typeof SIGNED_RED_GREEN_RGTC2_Format

For use with a THREE.CompressedTexture's .format property.

Compressed Require support for correct WebGL extension.