Instalé typedoc:

 npm install typedoc --save-dev

Luego agregó typedocOptions en tsconfig.json:

 { "compileOnSave": false, "compilerOptions": { "baseUrl": "./", // ...some lines there "typeRoots": [ "node_modules/@types" ], "lib": [ "es2018", "dom" ], "emitDecoratorMetadata": true }, "angularCompilerOptions": { "fullTemplateTypeCheck": true, "strictInjectionParameters": true }, "typedocOptions": { "mode": "modules", "out": "docs" } }

Entonces lo hago:

 npx typedoc --out docs src/index.ts

Y obtener el error:

 Error: Tried to set an option (mode) that was not declared.

¿Cómo lo soluciono?