[v.1.1.0] webpack -> rollup, to support ESM bundle

[Jay-WKJun]

Summary

These days, almost browsers are now support ESM system, so we can take advantage of ESM system.

so, i choose to support addtional ESM bundle, so that my library user's can take advantage of ESM system without any change of features.

and i choose to Rollup.js bundler to support it.

Webpack does support ESM library bundle but it's experiment version now.

ref: https://webpack.kr/configuration/output/#type-module

Improvement

ESM module

additional ESM module can use.

/* package.json */
"main": "dist/cjs/index.js",
"module": "dist/es/index.js",
"exports": {
  "import": "./dist/es/index.js",
  "require": "./dist/cjs/index.js"
},

lighter

besides of additional ESM bundle, library isn't go heavier than previous one.

It's lighter than the previous one.

Same Feature

It has same features as before. It's all same.