parcel: @parcel/transformer-typescript-types: Got unexpected undefined

🐛 bug report

I have been following the “building a library” instructions in Parcel. When adding my "types" property in package.json, I get an error message when running parcel build.

🎛 Configuration (.babelrc, package.json, cli command)

package.json:

{
  "name": "@jvanderen1/unstated-next",
  "version": "1.0.0",
  "description": "Up-to-date version of everyone's favorite state management library unstated-next",
  "repository": {
    "type": "git",
    "url": "https://github.com/jvanderen1/unstated-next"
  },
  "license": "MIT",
  "author": "<livetoscout@gmail.com>",
  "sideEffects": false,
  "main": "dist/unstated-next.cjs.js",
  "module": "dist/unstated-next.esm.js",
  "types": "dist/types.d.ts",
  "source": "src/index.ts",
  "scripts": {
    "build": "npm run clean:dist && parcel build",
    "clean": "npm run clean:dist && npm run clean:types && npm run clean:node-modules",
    "clean:dist": "rm -rf dist/",
    "clean:node-modules": "rm -rf node_modules/",
    "clean:types": "tsc --build --clean",
    "clean-install": "npm run clean && npm install",
    "dev": "parcel example/index.html",
    "lint": "eslint './'",
    "lint:fix": "npm run lint -- --fix",
    "prepare": "husky install",
    "pretty": "prettier --check './'",
    "pretty:fix": "prettier --write './'",
    "types-check": "tsc --skipLibCheck --noEmit"
  },
  "devDependencies": {
    "@parcel/transformer-typescript-types": "^2.0.0-rc.0",
    "@swc/cli": "^0.1.49",
    "@swc/core": "^1.2.80",
    "@types/node": "^16.7.1",
    "@types/react": "latest",
    "@types/react-dom": "latest",
    "@typescript-eslint/eslint-plugin": "^4.29.2",
    "@typescript-eslint/parser": "^4.29.2",
    "eslint": "^7.32.0",
    "eslint-plugin-react": "^7.24.0",
    "eslint-plugin-react-hooks": "^4.2.0",
    "husky": "^7.0.1",
    "lint-staged": "^11.1.2",
    "parcel": "^2.0.0-beta.3.1",
    "prettier": "^2.3.2",
    "prop-types": "latest",
    "react-dom": "latest",
    "ts-node": "^10.2.1",
    "typescript": "^4.3.5"
  },
  "peerDependencies": {
    "prop-types": ">= 15.5.0",
    "react": ">= 16.8.0"
  }
}

🤔 Expected Behavior

The parcel build command works with type definitions in dist/types.d.ts.

😯 Current Behavior

An error is thrown instead:

@parcel/transformer-typescript-types: Got unexpected undefined

  Error: Got unexpected undefined
  at nullthrows (/Users/jvanderen1/git-projects/unstated-next/node_modules/nullthrows/nullthrows.js:7:15)
  at TSModuleGraph.propagate (/Users/jvanderen1/git-projects/unstated-next/node_modules/@parcel/transformer-typescript-types/lib/TSModuleGraph.js:265:48)
  at shake (/Users/jvanderen1/git-projects/unstated-next/node_modules/@parcel/transformer-typescript-types/lib/shake.js:42:35)
  at /Users/jvanderen1/git-projects/unstated-next/node_modules/@parcel/transformer-typescript-types/lib/TSTypesTransformer.js:138:33
  at transformation (/Users/jvanderen1/git-projects/unstated-next/node_modules/typescript/lib/typescript.js:102910:24)
  at transformRoot (/Users/jvanderen1/git-projects/unstated-next/node_modules/typescript/lib/typescript.js:102937:82)
  at Object.transformNodes (/Users/jvanderen1/git-projects/unstated-next/node_modules/typescript/lib/typescript.js:102921:78)
  at emitDeclarationFileOrBundle (/Users/jvanderen1/git-projects/unstated-next/node_modules/typescript/lib/typescript.js:103653:43)
  at emitSourceFileOrBundle (/Users/jvanderen1/git-projects/unstated-next/node_modules/typescript/lib/typescript.js:103556:13)
  at forEachEmittedFile (/Users/jvanderen1/git-projects/unstated-next/node_modules/typescript/lib/typescript.js:103264:30)

💁 Possible Solution

When attaching a debugger to parcel build, I noticed the following exception being thrown:

After creating an empty .npmrc file in my project, I ran parcel build with the debugger again and received this exception:

🌍 Your Environment

Software	Version(s)
Parcel	^2.0.0-beta.3.1
Node	16.6.2
npm/Yarn	7.20.3
Operating System	macOS 11.5.1

About this issue

Original URL
State: closed
Created 3 years ago
Reactions: 8
Comments: 19 (7 by maintainers)

Most upvoted comments

Minimal reproduction:

// index.js
import { A, B } from "./types";
export function run(a: A): B {
  return a;
}

// types.js
export * from "./a";
export type B = number;

// a.js
export type A = number;

mischnic on Sep 11, 2021

I’m experiencing the same issue with these dependences:

  "@parcel/packager-ts": "^2.3.2",
    "@parcel/transformer-typescript-types": "^2.3.2",
    "parcel": "^2.3.2",
    "typescript": "^4.5.5"

Is there a solution to fix it?

arimariojesus on Feb 24, 2022