rollup.config.js

import pkg from './package.json'
import babel from 'rollup-plugin-babel'
const fs = require('fs')
let linter = false
try {
  fs.statSync('./node_modules/rollup-plugin-eslint/package.json')
  linter = require('rollup-plugin-eslint')
  console.log('Building with linting')
} catch (err) {
  console.log('Building without linting')
}

const rollupPlugins = []

if (linter) {
  rollupPlugins.push(
    linter.eslint({
      throwOnError: true,
      throwOnWarning: true,
      include: ['src/**'],
      exclude: ['node_modules/**', 'dist/**']
    })
  )
}
rollupPlugins.push(
  babel({
    exclude: ['node_modules/**']
  })
)

export default [
  // CommonJS (for Node) and ES module (for bundlers) build.
  // (We could have three entries in the configuration array
  // instead of two, but it's quicker to generate multiple
  // builds from a single configuration where possible, using
  // an array for the `output` option, where we can specify
  // `file` and `format` for each target)
  {
    input: 'src/main.js',
    output: [
      { file: pkg.main, format: 'cjs' },
      { file: pkg.module, format: 'es' }
    ],
    plugins: rollupPlugins,
    external: ['oidc-client-ts']
  }
]