These are TypeScript definitions for REPENTOGON, an exe-hack for the modding API of The Binding of Isaac: Repentance.

They are not included by default in IsaacScript mods.

First, add these definitions as a dependency (similar to any other JavaScript/TypeScript dependency):

npm install isaac-typescript-definitions-repentogon --save

Second, add the following to your "tsconfig.json" file:

  "compilerOptions": {
    "types": ["isaac-typescript-definitions-repentogon"],
  },