How to use the @pixi/settings.settings.PRECISION_FRAGMENT function in @pixi/settings

if (nameCache[name])
            {
                nameCache[name]++;
                name += `-${nameCache[name]}`;
            }
            else
            {
                nameCache[name] = 1;
            }

            this.vertexSrc = `#define SHADER_NAME ${name}\n${this.vertexSrc}`;
            this.fragmentSrc = `#define SHADER_NAME ${name}\n${this.fragmentSrc}`;

            this.vertexSrc = setPrecision(this.vertexSrc, settings.PRECISION_VERTEX, PRECISION.HIGH);
            this.fragmentSrc = setPrecision(this.fragmentSrc, settings.PRECISION_FRAGMENT, getMaxFragmentPrecision());
        }

        // currently this does not extract structs only default types
        this.extractData(this.vertexSrc, this.fragmentSrc);

        // this is where we store shader references..
        this.glPrograms = {};

        this.syncUniforms = null;
    }