rollup.config.ts

import resolve from '@rollup/plugin-node-resolve'
import commonjs from '@rollup/plugin-commonjs'
import typescript from 'rollup-plugin-typescript2'
import json from '@rollup/plugin-json'
import  pkg from './package.json'
import  path from 'path'

export default {
  input: `src/${path.parse(pkg.main).name}.ts`,
  output: [
    { file: pkg.main, format: 'cjs' },
  ],
  // Indicate here external modules you don't wanna include in your bundle (i.e.: 'lodash')
  external: ["vscode"],
  watch: {
    include: 'src/**',
  },
  plugins: [
    // Allow json resolution
    json(),
    // Compile TypeScript files
    typescript({ useTsconfigDeclarationDir: true,tsconfigOverride:{
      compilerOptions:{
        "module": "ESNext"
      }
    } }),
    // Allow bundling cjs modules (unlike webpack, rollup doesn't understand cjs)
    commonjs(),
    // Allow node_modules resolution, so you can use 'external' to control
    // which external modules to include in the bundle
    // https://github.com/rollup/rollup-plugin-node-resolve#usage
    resolve()
  ],
}