TypeError: Cannot read property 'isPure' of null

Input Code

Repo : https://github.com/jy95/torrent-files-library/tree/5b771ae69dd9b796b30a1147bedc25cd085af09d Changes not commited : Just added "babel-preset-minify": "^0.3.0" in my package.json and updated my .babelrc.js like this

let env = process.env.BABEL_ENV || process.env.NODE_ENV;
let presets = [];
let plugins = ["@babel/plugin-proposal-object-rest-spread"];
let ignore = ["src/docs/**/*.js"];
let comments = false;

// custom settings for prod/test ; for example babel-istanbul-plugin , etc.
switch (env){
  case 'test':
    // ./fix-coverage/arrow-function-coverage-fix.js : Because some odd issue for istanbul/nyc
    plugins.push.apply(plugins, ["./fix-coverage/arrow-function-coverage-fix.js", "babel-plugin-istanbul"]);
    break;

  case 'production':
    presets.push.apply(presets, ['minify']);
    break;
}

// default preset
presets.push.apply(presets, ["@babel/preset-env"]);

module.exports = {
  presets: presets,
  plugins: plugins,
  ignore: ignore,
  comments: comments,
};

Command to run production build

npm run prepare

Actual Output

TypeError: Cannot read property 'isPure' of null
    at Object.checkPath (D:\workspaceNodeJs\torrent-files-library\node_modules\@babel\traverse\lib\path\lib\virtual-types.js:120:23)
    at NodePath.(anonymous function) [as isPure] (D:\workspaceNodeJs\torrent-files-library\node_modules\@babel\traverse\lib\path\index.js:226:24)
    at isPureAndUndefined (D:\workspaceNodeJs\torrent-files-library\node_modules\babel-plugin-transform-remove-undefined\lib\index.js:21:13)
    at PluginPass.VariableDeclaration (D:\workspaceNodeJs\torrent-files-library\node_modules\babel-plugin-transform-remove-undefined\lib\index.js:216:21)
    at newFn (D:\workspaceNodeJs\torrent-files-library\node_modules\@babel\traverse\lib\visitors.js:223:21)
    at NodePath._call (D:\workspaceNodeJs\torrent-files-library\node_modules\@babel\traverse\lib\path\context.js:64:19)
    at NodePath.call (D:\workspaceNodeJs\torrent-files-library\node_modules\@babel\traverse\lib\path\context.js:38:17)
    at NodePath.visit (D:\workspaceNodeJs\torrent-files-library\node_modules\@babel\traverse\lib\path\context.js:99:12)
    at TraversalContext.visitQueue (D:\workspaceNodeJs\torrent-files-library\node_modules\@babel\traverse\lib\context.js:139:18)
    at TraversalContext.visitMultiple (D:\workspaceNodeJs\torrent-files-library\node_modules\@babel\traverse\lib\context.js:93:17)

Thanks for your help.

[garymathews]

Here’s a workaround, disable removeUndefined:

['minify', { removeUndefined: false }]

[ghost]

in my case

['minify', { removeUndefined: false, simplify: false }]