How to use the @pixi/constants.BLEND_MODES.ADD function in @pixi/constants

export function mapWebGLBlendModesToPixi(gl, array = [])
{
    // TODO - premultiply alpha would be different.
    // add a boolean for that!
    array[BLEND_MODES.NORMAL] = [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.ADD] = [gl.ONE, gl.ONE];
    array[BLEND_MODES.MULTIPLY] = [gl.DST_COLOR, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.SCREEN] = [gl.ONE, gl.ONE_MINUS_SRC_COLOR, gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.OVERLAY] = [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.DARKEN] = [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.LIGHTEN] = [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.COLOR_DODGE] = [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.COLOR_BURN] = [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.HARD_LIGHT] = [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.SOFT_LIGHT] = [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.DIFFERENCE] = [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.EXCLUSION] = [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.HUE] = [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.SATURATION] = [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.COLOR] = [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.LUMINOSITY] = [gl.ONE, gl.ONE_MINUS_SRC_ALPHA];
    array[BLEND_MODES.NONE] = [0, 0];

array[BLEND_MODES.COLOR_DODGE] = 'color-dodge';
        array[BLEND_MODES.COLOR_BURN] = 'color-burn';
        array[BLEND_MODES.HARD_LIGHT] = 'hard-light';
        array[BLEND_MODES.SOFT_LIGHT] = 'soft-light';
        array[BLEND_MODES.DIFFERENCE] = 'difference';
        array[BLEND_MODES.EXCLUSION] = 'exclusion';
        array[BLEND_MODES.HUE] = 'hue';
        array[BLEND_MODES.SATURATION] = 'saturate';
        array[BLEND_MODES.COLOR] = 'color';
        array[BLEND_MODES.LUMINOSITY] = 'luminosity';
    }
    else
    {
        // this means that the browser does not support the cool new blend modes in canvas 'cough' ie 'cough'
        array[BLEND_MODES.NORMAL] = 'source-over';
        array[BLEND_MODES.ADD] = 'lighter'; // IS THIS OK???
        array[BLEND_MODES.MULTIPLY] = 'source-over';
        array[BLEND_MODES.SCREEN] = 'source-over';
        array[BLEND_MODES.OVERLAY] = 'source-over';
        array[BLEND_MODES.DARKEN] = 'source-over';
        array[BLEND_MODES.LIGHTEN] = 'source-over';
        array[BLEND_MODES.COLOR_DODGE] = 'source-over';
        array[BLEND_MODES.COLOR_BURN] = 'source-over';
        array[BLEND_MODES.HARD_LIGHT] = 'source-over';
        array[BLEND_MODES.SOFT_LIGHT] = 'source-over';
        array[BLEND_MODES.DIFFERENCE] = 'source-over';
        array[BLEND_MODES.EXCLUSION] = 'source-over';
        array[BLEND_MODES.HUE] = 'source-over';
        array[BLEND_MODES.SATURATION] = 'source-over';
        array[BLEND_MODES.COLOR] = 'source-over';
        array[BLEND_MODES.LUMINOSITY] = 'source-over';
    }

{
    const pm = [];
    const npm = [];

    for (let i = 0; i < 32; i++)
    {
        pm[i] = i;
        npm[i] = i;
    }

    pm[BLEND_MODES.NORMAL_NPM] = BLEND_MODES.NORMAL;
    pm[BLEND_MODES.ADD_NPM] = BLEND_MODES.ADD;
    pm[BLEND_MODES.SCREEN_NPM] = BLEND_MODES.SCREEN;

    npm[BLEND_MODES.NORMAL] = BLEND_MODES.NORMAL_NPM;
    npm[BLEND_MODES.ADD] = BLEND_MODES.ADD_NPM;
    npm[BLEND_MODES.SCREEN] = BLEND_MODES.SCREEN_NPM;

    const array: number[][] = [];

    array.push(npm);
    array.push(pm);

    return array;
}