next.js/packages/next-server/tsconfig.json

{
  "compilerOptions": {
    "allowJs": true,
    "noEmit": true,
    "module": "esnext",
    "target": "ES2017",
    "esModuleInterop": true,
    "jsx": "react"
  }
}
Use Typescript to transpile Next.js core files instead of Babel (#5747) - Replaces taskr-babel with taskr-typescript for the `next` package - Makes sure Node 8+ is used, no unneeded transpilation - Compile Next.js client side files through babel the same way pages are - Compile Next.js client side files to esmodules, not commonjs, so that tree shaking works. - Move error-debug.js out of next-server as it's only used/require in development - Drop ansi-html as dependency from next-server - Make next/link esmodule (for tree-shaking) - Make next/router esmodule (for tree-shaking) - add typescript compilation to next-server - Remove last remains of Flow - Move hoist-non-react-statics to next, out of next-server - Move htmlescape to next, out of next-server - Remove runtime-corejs2 from next-server 2018-11-28 14:03:02 +00:00			`{`
			`"compilerOptions": {`
			`"allowJs": true,`
			`"noEmit": true,`
			`"module": "esnext",`
			`"target": "ES2017",`
			`"esModuleInterop": true,`
			`"jsx": "react"`
			`}`
			`}`