How to make SVGO remove all fill and stroke?

Question

JavaScript

I want to use gulp to collect all svg into one sprite. Before merging via gulp-svg-sprite, I minify all svgs via gulp-svgo. The settings are:

const svgo_options = {
    cleanupAttrs:               true,
    inlineStyles:               true,
    removeAttrs:                {attrs: '(stroke|fill)'},
    removeComments:             true,
    removeTitle:                true,
    removeDesc:                 true,
    removeUselessDefs:          true,
    removeMetadata:             true,
    removeEditorsNSData:        true,
    removeEmptyAttrs:           true,
    removeHiddenElems:          true,
    removeEmptyText:            true,
    removeEmptyContainers:      true,
    minifyStyles:               true,
    removeUnknownsAndDefaults:  true,
    removeUselessStrokeAndFill: true,
    cleanupIDs:                 false,
};

fill and stroke are not removed, and because of this, their color on the page cannot be changed via css. In removeAttrs passed and just true.