Custom Typescript Types Recipes for React + Webpack ES6 style imports use case: CSS files in /src/styles dir, and SVG and PNG files in /assets/images dir custom.d.ts file in dir of svg, png assets: declare module "*.svg" { const content: any; export default content; } declare module "*.png" { const content: any; export default content; } custom.d.ts file in styles dir alongside CSS files: declare module "*.css" { const content: any; export default content; } include those files/custom types, in tsconfig.json in project root: { "compilerOptions": { "outDir": "dist", "sourceMap": true, "module": "commonjs", "target": "es5", "jsx": "react" }, "include": ["./src/**/*", "src/styles/custom.d.ts", "assets/images/custom.d.ts"] }