tsconfig.json

{
  "extends": "@tsconfig/ember/tsconfig.json",
  "include": [
    "src/**/*",
    "unpublished-development-types/**/*"
  ],
  "compilerOptions": {
    "allowJs": true,
    "declarationDir": "declarations",
    "noEmit": false,
    "emitDeclarationOnly": true,
    "noEmitOnError": false,

    /**
      https://www.typescriptlang.org/tsconfig#rootDir
      "Default: The longest common path of all non-declaration input files."

      Because we want our declarations' structure to match our rollup output,
      we need this "rootDir" to match the "srcDir" in the rollup.config.mjs.

      This way, we can have simpler `package.json#exports` that matches
      imports to files on disk
    */
    "rootDir": "./src",

    /**
      https://www.typescriptlang.org/tsconfig#verbatimModuleSyntax

      We don't want to include types dependencies in our compiled output, so tell TypeScript
      to enforce using `import type` instead of `import` for Types.
     */
    "verbatimModuleSyntax": true,

    /**
      https://www.typescriptlang.org/tsconfig#allowImportingTsExtensions

      We want our tooling to know how to resolve our custom files so the appropriate plugins
      can do the proper transformations on those files.
    */
    "allowImportingTsExtensions": true
  }
}