fix: exports file extensions

[serkodev]

Changes

• Rename index.cjs.js, index.esm.js to index.cjs and index.mjs
• Update version and links from README

This changes follow the official document of Node.js for .mjs and .cjs file extension to let Node to interpret the package is an ES module or CJS.

Authors can tell Node.js to interpret JavaScript as an ES module via the .mjs file extension, the package.json "type" field with a value "module", the --input-type flag with a value of "module", or the --experimental-default-type flag with a value of "module". These are explicit markers of code being intended to run as an ES module.

Inversely, authors can tell Node.js to interpret JavaScript as CommonJS via the .cjs file extension, the package.json "type" field with a value "commonjs", the --input-type flag with a value of "commonjs", or the --experimental-default-type flag with a value of "commonjs".

Reference

Fix

It can fix the following errors from Node.js build.

ReferenceError: module is not defined in ES module scope
This file is being treated as an ES module because it has a '.js' file extension and './node_modules/is-apng/package.json' contains "type": "module". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.

[vHeemstra]

@serkodev Thank you for your PR 👍