/// // Extend the NodeJS namespace with Next.js-defined properties declare namespace NodeJS { interface Process { readonly browser: boolean } interface ProcessEnv { readonly NODE_ENV: 'development' | 'production' | 'test' } } declare module '*.module.css' { const classes: { readonly [key: string]: string } export default classes } declare module '*.module.sass' { const classes: { readonly [key: string]: string } export default classes } declare module '*.module.scss' { const classes: { readonly [key: string]: string } export default classes }