jsPsych/packages/config/tsconfig.core.json

{
  // tsconfig for the jsPsych monorepo
  "extends": "@jspsych/config/tsconfig.json",
  "compilerOptions": {
    // map package imports directly to their source files
    "paths": {
      "jspsych": ["../jspsych/src"],
      "@jspsych/*": ["../*/src"]
    },
  }
}