Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Version X: prod build only - Uncaught TypeError: Object(...) is not a function

See original GitHub issue

Everything is working fine in dev but when I run a prod build I am seeing Uncaught TypeError: Object(...) is not a function. I think this is related to the move to preact createContext.

The error starts right after createContext in my build right around hereHt.createContext)(),fn=function(t){function e.

When I try to log out createContext it is undefined. I tried using import { Component, createContext } from 'preact'; and import { Component, createContext } from 'preact/compat';

Issue Analytics

State:
Created 4 years ago
Comments:5 (2 by maintainers)

Top GitHub Comments

1reaction

jaikathuriacommented, Oct 11, 2019

@JoviDeCroock I am also getting the same error for preact-router: 3.0.1 at /node_modules/preact-router/dist/preact-router.es.js:323:40

My dependency tree is

"devDependencies": {
    "eslint": "^5.14.1",
    "eslint-config-smallcase": "git+ssh://git@gitlab.com:smallcase/frontend/eslint-config-smallcase.git",
    "eslint-config-standard-preact": "^1.1.6",
    "eslint-plugin-import": "^2.16.0",
    "eslint-plugin-node": "^8.0.1",
    "eslint-plugin-promise": "^4.0.1",
    "eslint-plugin-react": "^7.12.4",
    "eslint-plugin-standard": "^4.0.0",
    "fast-async": "^6.3.8",
    "husky": "^1.3.1",
    "identity-obj-proxy": "^3.0.0",
    "jest": "^21.2.1",
    "lint-staged": "^8.1.4",
    "per-env": "^1.0.2",
    "preact-cli": "^2.2.1",
    "preact-render-spy": "^1.3.0",
    "superstatic": "^6.0.4"
  },
  "dependencies": {
    "axios": "^0.19.0",
    "preact": "^10.0.0",
    "preact-render-to-string": "^5.0.6",
    "preact-router": "^3.0.1"
  },

When I run:

pm i --save preact-cli@rc

My build starts giving an error in preact.config.js which is as follow:

import webpack from 'webpack';

// const publicPath = '/frame/';

export default (config, env, helpers) => {
  // config.output.publicPath = publicPath;

  // Make async work
  const babel = config.module.loaders.filter(loader => loader.loader === 'babel-loader')[0].options;
  // Blacklist regenerator within env preset:
  babel.presets[0][1].exclude.push('transform-async-to-generator');
  // Add fast-async
  babel.plugins.push([require.resolve('fast-async'), { spec: true }]);
};

With the following error TypeError: Cannot read property 'filter' of undefined

Any idea what I am doing wrong ?

0reactions

ostecommented, Jul 30, 2019

that fixed it, Thanks!