babel-runtime/helpers/typeof requires itself - again

[sheerun]

This issue happens again, in babel-runtime 6.11.6 when using rollup.

This is rollup.config.js to reproduce:

import json from 'rollup-plugin-json';
import babel from 'rollup-plugin-babel';
import commonjs from 'rollup-plugin-commonjs';
import nodeResolve from 'rollup-plugin-node-resolve';

export default {
  entry: 'node_modules/babel-runtime/helpers/typeof.js',
  format: 'cjs',
  plugins: [
    json(),
    babel({ runtimeHelpers: true }),
    nodeResolve({ jsnext: true, main: true }),
    commonjs()
  ],
  dest: 'bundle.js'
};

Related: #3711, rollup/rollup-plugin-babel#97

[tjclement]

This same issue also happens when transpiling a JSPM (0.17.0-beta.22) project with babel and rollup. Haven't been able to figure out why, so far.

[mfirmin]

I was running into the same problem, and spent most of yesterday trying to fix it.

Turns out, if you just add exclude: 'node_modules/**' (or in my case, make sure the path is correct...) to the babel plugin in your rollup config, it works perfectly:

import json from 'rollup-plugin-json';
import babel from 'rollup-plugin-babel';
import commonjs from 'rollup-plugin-commonjs';
import nodeResolve from 'rollup-plugin-node-resolve';

export default {
  entry: 'node_modules/babel-runtime/helpers/typeof.js',
  format: 'cjs',
  plugins: [
    json(),
    babel({ runtimeHelpers: true, exclude: 'node_modules/**' }),
    nodeResolve({ jsnext: true, main: true }),
    commonjs()
  ],
  dest: 'bundle.js'
};

[chicoxyzzy]

Seems like this issue is related to rollup-plugin-babel, not Babel

[bdwain]

@chicoxyzzy running babel-external-helpers -t umd > es/babel-external-helpers.js gives me a file that can't run in the browser. the error is babelHelpers.typeof is not a function.

This seems to be the problematic code (at the very beginning of the function)

  var babelHelpers = global;
  babelHelpers.typeof = typeof Symbol === "function" && babelHelpers.typeof(Symbol.iterator) === "symbol" ? function (obj) {
    return typeof obj === "undefined" ? "undefined" : babelHelpers.typeof(obj);
  } : function (obj) {
    return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj === "undefined" ? "undefined" : babelHelpers.typeof(obj);
  };

[loganfsmyth]

babel-external-helpers works on 7.x branch at least. Closing this otherwise since it does not seem like a babel issue. Compiling the helpers to reference themselves will indeed cause issues.