Rollup plugin to place license from file at the very top of the bundled file. This works even with imports. The true banner.

npm install --save-dev rollup-plugin-true-banner

Example usage

import trueBanner from 'rollup-plugin-true-banner';

export default [
    {
        input: 'index.js',
        output: [
            {
                file: 'index.js',
                format: 'es',
                sourcemap: false,
            }
        ],
        plugins: [
            resolve(),
            commonjs(),
            terser({
                mangle: {
                    reserved: ['autofocus'],
                    keep_fnames: true,
                    keep_classnames: true,
                },
                format: {
                    comments: /^!/
                },
                compress: {
                    keep_fargs: true,
                    drop_console: true, // Strip console logs
                },
            }),
            trueBanner({
                file: 'license'
                licenseFile: true
            }) // <-- Run after minification and whatnot
        ],
    },
];

Example result

let f=(a,b)=>Math.floor(Math.random()*(b-a+1))+a;class P{constructor(n){this.n=n||"X";this.i=f(1e3,9999)}g(){console.log(`Hi, I'm ${this.n} #${this.i}`)}d(){let x=["run","jump","code","sleep"][f(0,3)];console.log(this.n+" is "+x)}}p=new P("Bot");p.g();p.d();w=t=>new Promise(r=>setTimeout(r,t));(async()=>{console.log("Wait...");await w(1e3);console.log("Done")})();
/*! Copyright (c) 1970 John */
console.log(["foo","bar","baz","qux"][Math.floor(Math.random()*4)]);

To

/*!
Copyright (c) 1970 John
*/
let f=(a,b)=>Math.floor(Math.random()*(b-a+1))+a;class P{constructor(n){this.n=n||"X";this.i=f(1e3,9999)}g(){console.log(`Hi, I'm ${this.n} #${this.i}`)}d(){let x=["run","jump","code","sleep"][f(0,3)];console.log(this.n+" is "+x)}}p=new P("Bot");p.g();p.d();w=t=>new Promise(r=>setTimeout(r,t));(async()=>{console.log("Wait...");await w(1e3);console.log("Done")})(); console.log(["foo","bar","baz","qux"][Math.floor(Math.random()*4)]);

Options

|Option|Value|Functionality|Default| |------|-----|-------------|-------| |file|string (path)|Load license from separate file|null| |licenseFile|boolean|Determines if file is regular text file, for example a license file|false|

licenseFile option looks for comment based license if set to false. If set to true it will read the text from file as is.