How to use the @pixi/core.Texture function in @pixi/core

const letter = letters[i];
            const charCode = parseInt(letter.getAttribute('id'), 10);
            const page = letter.getAttribute('page') || 0;
            const textureRect = new Rectangle(
                (parseInt(letter.getAttribute('x'), 10) / res) + (pagesTextures[page].frame.x / res),
                (parseInt(letter.getAttribute('y'), 10) / res) + (pagesTextures[page].frame.y / res),
                parseInt(letter.getAttribute('width'), 10) / res,
                parseInt(letter.getAttribute('height'), 10) / res
            );

            data.chars[charCode] = {
                xOffset: parseInt(letter.getAttribute('xoffset'), 10) / res,
                yOffset: parseInt(letter.getAttribute('yoffset'), 10) / res,
                xAdvance: parseInt(letter.getAttribute('xadvance'), 10) / res,
                kerning: {},
                texture: new Texture(pagesTextures[page].baseTexture, textureRect),
                page,
            };
        }

        // parse kernings
        const kernings = xml.getElementsByTagName('kerning');

        for (let i = 0; i < kernings.length; i++)
        {
            const kerning = kernings[i];
            const first = parseInt(kerning.getAttribute('first'), 10) / res;
            const second = parseInt(kerning.getAttribute('second'), 10) / res;
            const amount = parseInt(kerning.getAttribute('amount'), 10) / res;

            if (data.chars[second])
            {

Math.floor(rect.h) / this.resolution
                    );
                }

                //  Check to see if the sprite is trimmed
                if (data.trimmed !== false && data.spriteSourceSize)
                {
                    trim = new Rectangle(
                        Math.floor(data.spriteSourceSize.x) / this.resolution,
                        Math.floor(data.spriteSourceSize.y) / this.resolution,
                        Math.floor(rect.w) / this.resolution,
                        Math.floor(rect.h) / this.resolution
                    );
                }

                this.textures[i] = new Texture(
                    this.baseTexture,
                    frame,
                    orig,
                    trim,
                    data.rotated ? 2 : 0,
                    data.anchor
                );

                // lets also add the frame to pixi's global cache for 'from' and 'fromLoader' functions
                Texture.addToCache(this.textures[i], i);
            }

            frameIndex++;
        }
    }

const letter = letters[i];
            const charCode = parseInt(letter.getAttribute('id'), 10);
            const page = letter.getAttribute('page') || 0;
            const textureRect = new Rectangle(
                (parseInt(letter.getAttribute('x'), 10) / res) + (pagesTextures[page].frame.x / res),
                (parseInt(letter.getAttribute('y'), 10) / res) + (pagesTextures[page].frame.y / res),
                parseInt(letter.getAttribute('width'), 10) / res,
                parseInt(letter.getAttribute('height'), 10) / res
            );

            data.chars[charCode] = {
                xOffset: parseInt(letter.getAttribute('xoffset'), 10) / res,
                yOffset: parseInt(letter.getAttribute('yoffset'), 10) / res,
                xAdvance: parseInt(letter.getAttribute('xadvance'), 10) / res,
                kerning: {},
                texture: new Texture(pagesTextures[page].baseTexture, textureRect),
                page,
            };
        }

        // parse kernings
        const kernings = xml.getElementsByTagName('kerning');

        for (let i = 0; i < kernings.length; i++)
        {
            const kerning = kernings[i];
            const first = parseInt(kerning.getAttribute('first'), 10) / res;
            const second = parseInt(kerning.getAttribute('second'), 10) / res;
            const amount = parseInt(kerning.getAttribute('amount'), 10) / res;

            if (data.chars[second])
            {