Add polyfill for Array.flat because it's not available on older versions of node.
Add polyfill for Array.flat because it's not available on older versions of node.

foam-framework/foam2,jacksonic/vjlofvhjfgm,foam-framework/foam2,jacksonic/vjlofvhjfgm,foam-framework/foam2,jacksonic/vjlofvhjfgm,foam-framework/foam2,foam-framework/foam2