Create-react-app Typescript error TS1209

[PD0815]

Hello

I'm using create-react-app with TypeScript enabled to build a React App. But when I want to compile the code I'm getting the following error:
Type error: Ambient const enums are not allowed when the '--isolatedModules' flag is provided. TS1209.

Environment

• blueprintjs/datetime: "^3.3.1"
• react-scripts: "2.1.1",

Actual behavior

Creating an optimized production build...
Failed to compile.

/usr/src/app/node_modules/@blueprintjs/datetime/lib/esm/common/months.d.ts
Type error: Ambient const enums are not allowed when the '--isolatedModules' flag is provided.  TS1209

     5 |  * easily compared to `date.getMonth()`.
     6 |  */
  >  7 | export declare const enum Months {
       |                           ^
     8 |     JANUARY = 0,
     9 |     FEBRUARY = 1,
    10 |     MARCH = 2,


npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] build: `react-scripts build`
npm ERR! Exit status 1

Possible solution

When I change the following line from
export const enum Months
to
export enum Months
in the node_modules blueprint/packages/datetime/src/common/months.ts
the App compiles correctly.

[giladgray]

huh whoops that should definitely be a regular enum, not a const enum. happy to review a PR @PD0815 👍