rollup failed: 'Logger' is not exported by node_modules/angular2-logger/core.js

[olivermuc]

Following the install instructions & getting this with ionic 2:

[11:18:03]  ionic-app-scripts 0.0.48 
[11:18:03]  build dev started ... 
[11:18:03]  clean started ... 
[11:18:03]  clean finished in 4 ms 
[11:18:03]  copy started ... 
[11:18:03]  transpile started ... 
[11:18:07]  transpile finished in 3.75 s 
[11:18:07]  rollup started ... 
[11:18:07]  copy finished in 3.82 s 
[11:18:13]  rollup failed: 'Logger' is not exported by node_modules/angular2-logger/core.js (imported by 
            src/app/app.component.ts). For help fixing this error see 
            https://github.com/rollup/rollup/wiki/Troubleshooting#name-is-not-exported-by-module 

[langley-agm]

Have you tried this @olivermuc? https://github.com/rollup/rollup-plugin-commonjs#custom-named-exports

[olivermuc]

Thx @langley-agm - will give it a shot shortly.

[pdavin-zz]

I also have this problem and tried the rollup commonjs workaround, but now encounter this error: Error parsing /....../node_modules/angular2-logger/app/core/level.ts: Unexpected token (9:7) in /....../node_modules/angular2-logger/app/core/level.ts

For some reason rollup is trying to parse a Typescript file from the core.js require. I don't know what to do about this.

[michel-zededa]

I must be doing something wrong, it's not working despite @olivermuc solution. Seems like it completely ignores 'namedExports'. Running 'rollup-plugin-commonjs' version '^8.0.0'. Anybody any clues?

'use strict';

import commonjs    from 'rollup-plugin-commonjs';
import nodeResolve from 'rollup-plugin-node-resolve'
import uglify      from 'rollup-plugin-uglify'

import chalk from 'chalk';
const seen = new Set();
if (!process.stderr.isTTY) {
  chalk.enabled = false;
}
const warnSymbol = process.stderr.isTTY ? `Warning: ` : `Warning: `;
const stderr = console.error.bind(console);
const handleWarning = warning => {
  const str = warning.toString();
  if (seen.has(str)) {
    return;
  }
  seen.add(str);
  stderr(`${warnSymbol}${chalk.bold(warning.message)}`);
  if (warning.url) {
    stderr(chalk.cyan(warning.url));
  }
  if (warning.loc) {
    stderr(`${warning.loc.file} (${warning.loc.line}:${warning.loc.column})`);
  }
  if (warning.frame) {
    stderr(chalk.dim(warning.frame));
  }
  stderr('');
};

const warnFilter = /The 'this' keyword is equivalent to 'undefined'/;

export default {
  entry: './dist/out-tsc/src/main-aot.js',
  dest: 'aot/dist/build.min.js', // output a single application bundle

  sourceMap: true,
  sourceMapFile: 'aot/dist/build.min.js.map',

  treeshake: true,
  format: 'iife',

  onwarn: warning => {  // overwite the default warning function
    const str = warning.toString();
    if (warnFilter.test(str)) {
      return;
    }
    handleWarning(warning);
  },
  plugins: [
    nodeResolve({jsnext: true, module: true}),
    commonjs({
               include: [
                 'node_modules/rxjs/**',
               ],

               namedExports: {
                 'node_modules/angular2-logger/core.js': ['Logger', 'Options']
               }
             }),
    uglify()
  ]
}