Bug : Cannot find module 'koa' during build

[uchar]

Hi there,
When I try to build using tsc -p tsconfig.build.json, I get this error :

node_modules/graphql-upload-ts/dist/graphqlUploadKoa.d.ts:1:31 - error TS2307: Cannot find module 'koa' or its corresponding type declarations.

1 import { Context, Next } from 'koa';
                                ~~~~~

Found 1 error in node_modules/graphql-upload-ts/dist/graphqlUploadKoa.d.ts:1

Error will be fixed after installing koa but I dont need koa in my project