Babel transformation error: “don’t know how to turn this value into a node”

Bug Report

After upgrading webpack and babel I’m now faced with a few errors like this from our vue-jest based test suite, and I have no idea how to go about debugging them:

/home/rof/src/ don't know how to turn this value into a node

Current behavior

This is the only type of stacktrace I get, on around 8 or so tests:

 FAIL  spec/javascript/general-stats/GeneralStats.spec.js
  ● Test suite failed to run

    /Users/samuelstickland/development/hubbado/hubbado_core/app/javascript/general-stats/views/GeneralStats.vue: don't know how to turn this value into a node

      at valueToNode (node_modules/@babel/types/lib/converters/valueToNode.js:87:9)
      at Object.valueToNode (node_modules/@babel/types/lib/converters/valueToNode.js:81:58)
      at Object.exit (node_modules/istanbul-lib-instrument/dist/visitor.js:641:30)
      at PluginPass.exit (node_modules/babel-plugin-istanbul/lib/index.js:158:38)
      at newFn (node_modules/@babel/traverse/lib/visitors.js:179:21)
      at NodePath._call (node_modules/@babel/traverse/lib/path/context.js:55:20)
      at (node_modules/@babel/traverse/lib/path/context.js:42:17)
      at NodePath.visit (node_modules/@babel/traverse/lib/path/context.js:99:8)
      at TraversalContext.visitQueue (node_modules/@babel/traverse/lib/context.js:112:16)
      at TraversalContext.visitSingle (node_modules/@babel/traverse/lib/context.js:84:19)
      at TraversalContext.visit (node_modules/@babel/traverse/lib/context.js:140:19)
      at Function.traverse.node (node_modules/@babel/traverse/lib/index.js:84:17)
      at traverse (node_modules/@babel/traverse/lib/index.js:66:12)
      at transformFile (node_modules/@babel/core/lib/transformation/index.js:107:29)
          at (<anonymous>)
      at run (node_modules/@babel/core/lib/transformation/index.js:35:12)

Input Code

Apologies, I’m not sure what code will be useful to share here.- I’m open to suggestions. Our test suite is currently using vue-jest

Expected behavior
Files continue to be transformed correctly in the test suite

Babel Configuration (babel.config.js, .babelrc, package.json#babel, cli command, .eslintrc)

  • Filename: babel.config.js
module.exports = function(api) {
  var validEnv = ['development', 'test', 'production']
  var currentEnv = api.env()
  var isDevelopmentEnv = api.env('development')
  var isProductionEnv = api.env('production')
  var isTestEnv = api.env('test')

  if (!validEnv.includes(currentEnv)) {
    throw new Error(
      'Please specify a valid `NODE_ENV` or ' +
        '`BABEL_ENV` environment variables. Valid values are "development", ' +
        '"test", and "production". Instead, received: ' +
        JSON.stringify(currentEnv) +

  return {
    presets: [
      isTestEnv && [
          targets: {
            node: 'current'
      (isProductionEnv || isDevelopmentEnv) && [
          forceAllTransforms: true,
          useBuiltIns: 'entry',
          corejs: 3,
          modules: false,
          exclude: ['transform-typeof-symbol']
    plugins: [
      isTestEnv && require('babel-plugin-dynamic-import-node'),
          loose: true
          useBuiltIns: true
          helpers: false,
          regenerator: true,
          corejs: false
          async: false


npx: installed 1 in 1.922s

    OS: macOS 10.15.4
    Node: 14.3.0 - /usr/local/bin/node
    Yarn: 1.22.4 - /usr/local/bin/yarn
    npm: 6.14.4 - /usr/local/bin/npm
  • How you are using Babel: loader (via webpacker)

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