tsconfig.json

{
  "compilerOptions": {
    /* Modules */
    "baseUrl": ".",
    "module": "commonjs",
    "moduleResolution": "nodenext",
    "paths": {
      "@emotion/core": ["sink.d.ts"]
    },
    "resolveJsonModule": true,

    /* Type Checking */
    "noFallthroughCasesInSwitch": true,
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "strict": true,

    /* Language and Environment */
    "experimentalDecorators": true,
    "jsx": "react-jsx",
    "lib": ["dom", "dom.iterable", "ESNext", "ESNext.AsyncIterable"],
    "target": "es6",

    /* Interop Constraints */
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,

    /* Emit */
    "declaration": true,
    "downlevelIteration": true,
    "inlineSources": true,
    "preserveConstEnums": true,
    "removeComments": false,
    "sourceMap": true,

    /* Completeness */
    "allowJs": false,
    "skipLibCheck": true
  },
  "exclude": ["**/dist/*", "**/esm/*", "**/__testfixtures__/*"]
}