tsconfig.json

{
  "compilerOptions": {
    /* Language and Environment */
    "target": "esnext",                                  /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
    "lib": ["dom", "esnext"],                                        /* Specify a set of bundled library declaration files that describe the target runtime environment. */
    "jsx": "react",                                /* Specify what JSX code is generated. */

    /* Modules */
    "module": "esnext",                                /* Specify what module code is generated. */
    "moduleResolution": "node",                       /* Specify how TypeScript looks up a file from a given module specifier. */
    "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */
    "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */

    /* Type Checking */
    "strict": true,                                      /* Enable all strict type-checking options. */
  },
  "include": ["./src/**/*", "./gatsby-node.ts", "./gatsby-config.ts", "./plugins/**/*"]
}