@parcel/transformer-typescript-types throws a "Got unexpected undefined" error when using a re-exported type

[jakeboone02]

🐛 bug report

@parcel/transformer-typescript-types throws a Got unexpected undefined error when using a re-exported type/interface in a React component. I'm not sure that's the root cause but it's the only way I can reproduce the erro consistently.

In this minimal example repo, look at the src/controls/ValueEditor.tsx file, which has a working line (commented out) and a non-working line. Both lines should work.

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

Running yarn build throws the error, even after deleting .parcel-cache. I do not have a .babelrc.

package.json:

{
  "name": "parcel-basic-test",
  "version": "1.0.0",
  "private": true,
  "source": "src/index.ts",
  "main": "dist/index.js",
  "module": "dist/index.esm.js",
  "types": "dist/types.d.ts",
  "license": "MIT",
  "devDependencies": {
    "@parcel/packager-ts": "^2.0.1",
    "@parcel/transformer-typescript-types": "^2.0.1",
    "@types/react": "^17.0.36",
    "parcel": "^2.0.1",
    "react": "^17.0.2",
    "rimraf": "^3.0.2",
    "typescript": "^4.5.2"
  },
  "peerDependencies": {
    "react": ">=16.8.0",
    "react-dom": ">=16.8.0"
  },
  "scripts": {
    "build": "rimraf dist && parcel build"
  }
}

tsconfig.json:

{
  "compilerOptions": {
    "target": "es2021",
    "jsx": "react-jsx",
    "module": "ES6",
    "moduleResolution": "node",
    "esModuleInterop": true,
    "strict": true,
    "skipLibCheck": true
  }
}

🤔 Expected Behavior

Parcel should not error out.

😯 Current Behavior

PS C:\Users\jaboone\git\parcel-basic-test> rm -r .\.parcel-cache\ && yarn build
yarn run v1.22.17
$ rimraf dist && parcel build
× Build failed.

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

  Error: Got unexpected undefined
  at nullthrows (C:\Users\jaboone\git\parcel-basic-test\node_modules\nullthrows\nullthrows.js:7:15)
  at TSModuleGraph.propagate (C:\Users\jaboone\git\parcel-basic-test\node_modules\@parcel\transformer-typescript-types\lib\TSModuleGraph.js:267:48)
  at shake (C:\Users\jaboone\git\parcel-basic-test\node_modules\@parcel\transformer-typescript-types\lib\shake.js:42:35)
  at C:\Users\jaboone\git\parcel-basic-test\node_modules\@parcel\transformer-typescript-types\lib\TSTypesTransformer.js:138:33
  at transformation (C:\Users\jaboone\git\parcel-basic-test\node_modules\typescript\lib\typescript.js:107012:24)
  at transformRoot (C:\Users\jaboone\git\parcel-basic-test\node_modules\typescript\lib\typescript.js:107039:82)
  at Object.transformNodes (C:\Users\jaboone\git\parcel-basic-test\node_modules\typescript\lib\typescript.js:107023:78)
  at emitDeclarationFileOrBundle (C:\Users\jaboone\git\parcel-basic-test\node_modules\typescript\lib\typescript.js:107737:43)
  at emitSourceFileOrBundle (C:\Users\jaboone\git\parcel-basic-test\node_modules\typescript\lib\typescript.js:107640:13)
  at forEachEmittedFile (C:\Users\jaboone\git\parcel-basic-test\node_modules\typescript\lib\typescript.js:107366:30)

error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

💁 Possible Solution

N/A

🔦 Context

Trying to migrate the react-querybuilder repo from webpack to Parcel + monorepo. See parcel branch for current attempt.

💻 Code Sample

Example repo. Clone, cd to the new folder, then run yarn && yarn build.

🌍 Your Environment

Software	Version(s)
Parcel	2.0.1
Node	16.13.0
npm/Yarn	1.22.17
Operating System	any (fails on all)

[olipyskoty]

Hey! I also received this same error, though I don't have the slightest clue where it is coming from.

@jakeboone02 I was able to bypass this error by following the workaround in the description for #5735 listed here. For some reason by adding the following to my package.json I no longer receive the error:

  "types": "index.d.ts",
  "targets": {
    "types": false
  },

Again, not sure why this fixes it, but I figured it might be able to help you out as this issue gets investigated.

[jakeboone02]

Thanks @olipyskoty, but doesn't that prevent the types from being generated at all?

[tylim88]

is this problem solved, I still having similar issue here

parcel 2.3.2

setting target type to false works but we need the declaration file

[elijahmontenegro]

this is still an issue for me using parcel 2.5.0

EDIT:
Fixed for me. The issue was my other parcel dependencies (specifically @parcel/packager-ts) were not in line with my parcel version. I also incremented to version 2.6.0 where I had the same issue before fixing the versions.

[steve-taylor]

Still fails in 2.6.2.

🚨 Build failed.

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

  Error: Got unexpected undefined
      at nullthrows (/path/to/monorepo/node_modules/nullthrows/nullthrows.js:7:15)
      at TSModuleGraph.propagate (/path/to/monorepo/node_modules/@parcel/transformer-typescript-types/lib/TSModuleGraph.js:271:48)
      at shake (/path/to/monorepo/node_modules/@parcel/transformer-typescript-types/lib/shake.js:42:35)
      at /path/to/monorepo/node_modules/@parcel/transformer-typescript-types/lib/TSTypesTransformer.js:148:33
      at transformation (/path/to/monorepo/node_modules/typescript/lib/typescript.js:109638:24)
      at transformRoot (/path/to/monorepo/node_modules/typescript/lib/typescript.js:109665:82)
      at Object.transformNodes (/path/to/monorepo/node_modules/typescript/lib/typescript.js:109649:78)
      at emitDeclarationFileOrBundle (/path/to/monorepo/node_modules/typescript/lib/typescript.js:110363:43)
      at emitSourceFileOrBundle (/path/to/monorepo/node_modules/typescript/lib/typescript.js:110266:13)
      at forEachEmittedFile (/path/to/monorepo/node_modules/typescript/lib/typescript.js:109992:30)

[kre1z0]

Do not use global types from d.ts source declare in typescript files like a

use global.ts not global.d.ts without import

declare global {
  interface Window {};
  type ValueOf<T> = T[keyof T];
}

[mxmvshnvsk]

parcel@2.7.0 @parcel/transformer-typescript-types@2.7.0 still fails, any solutions?

[lucasruy]

Hey! I also received this same error, though I don't have the slightest clue where it is coming from.

@jakeboone02 I was able to bypass this error by following the workaround in the description for #5735 listed here. For some reason by adding the following to my package.json I no longer receive the error:

  "types": "index.d.ts",
  "targets": {
    "types": false
  },

Again, not sure why this fixes it, but I figured it might be able to help you out as this issue gets investigated.

Even if there is no explanation for this, thanks for sharing as it helped me to solve this problem in my project.

[mischnic]

explanation

This just completely disables the generation of a types file in Parcel. So you'll have to write index.d.ts yourself or generate it by some other means.