gulpfile.js

#!/usr/bin/env node

const path = require('path')

const del = require('del')
const gulp = require('gulp')
const browserify = require('browserify')
const uglify = require('gulp-uglify')
const babel = require('gulp-babel')
const rename = require('gulp-rename')
const source = require('vinyl-source-stream')
const exorcist = require('exorcist')
const streamify = require('gulp-streamify')

const DEST = path.join(__dirname, 'dist/')

const packages = [
    {
        fileName: 'caver',
        expose: 'Caver',
        src: './index.js',
        ignore: ['xhr2', 'xmlhttprequest', 'websocket'],
    },
    {
        fileName: 'caver-utils',
        expose: 'CaverUtils',
        src: './packages/caver-utils/src/index.js',
    },
    {
        fileName: 'caver-klay',
        expose: 'CaverKlay',
        src: './packages/caver-klay/src/index.js',
    },
    {
        fileName: 'caver-core-helpers',
        expose: 'CaverHelpers',
        src: './packages/caver-core-helpers/src/index.js',
    },
    {
        fileName: 'caver-middleware',
        expose: 'CaverMiddleware',
        src: './packages/caver-middleware/src/index.js',
    },
    {
        fileName: 'caver-rtm',
        expose: 'CaverRtm',
        src: './packages/caver-middleware/src/index.js',
    },
    {
        fileName: 'caver-net',
        expose: 'CaverNet',
        src: './packages/caver-net/src/index.js',
    },
    {
        fileName: 'caver-core-requestmanager',
        expose: 'CaverRequestManager',
        src: './packages/caver-core-requestmanager/src/index.js',
        ignore: ['xhr2', 'xmlhttprequest', 'websocket'],
    },
    {
        fileName: 'caver-core-subscriptions',
        expose: 'CaverSubscriptions',
        src: './packages/caver-core-subscriptions/src/index.js',
    },
    {
        fileName: 'caver-core-method',
        expose: 'CaverMethod',
        src: './packages/caver-core-method/src/index.js',
    },
]

const browserifyOptions = {
    debug: true,
    derequire: true,
    insertGlobalVars: false, // jshint ignore:line
    detectGlobals: true,
    bundleExternal: true,
}

const ugliyOptions = {
    compress: {
        dead_code: true, // jshint ignore:line
        drop_debugger: true, // jshint ignore:line
        global_defs: {
            // jshint ignore:line
            DEBUG: false, // matters for some libraries
        },
    },
}

gulp.task(
    'clean',
    gulp.series(function(cb) {
        del([DEST]).then(cb.bind(null, null))
    })
)

packages.forEach(function(pckg, i) {
    const prevPckg = !i ? 'clean' : packages[i - 1].fileName

    gulp.task(
        pckg.fileName,
        gulp.series(prevPckg, function() {
            browserifyOptions.standalone = pckg.expose

            const pipe = browserify(browserifyOptions)
                .require(pckg.src, { expose: pckg.expose })
                .require('bn.js', { expose: 'BN' }) // expose it to dapp developers
                .add(pckg.src)

            if (pckg.ignore) {
                pckg.ignore.forEach(function(ignore) {
                    pipe.ignore(ignore)
                })
            }

            return pipe
                .bundle()
                .pipe(exorcist(path.join(DEST, `${pckg.fileName}.js.map`)))
                .pipe(source(`${pckg.fileName}.js`))
                .pipe(
                    streamify(
                        babel({
                            compact: false,
                            presets: ['@babel/preset-env'],
                            plugins: ['@babel/plugin-transform-runtime'],
                        })
                    )
                )
                .pipe(gulp.dest(DEST))
                .pipe(
                    streamify(
                        babel({
                            compact: true,
                            presets: ['@babel/preset-env'],
                            plugins: ['@babel/plugin-transform-runtime'],
                        })
                    )
                )
                .pipe(streamify(uglify(ugliyOptions)))
                .on('error', function(err) {
                    console.error(err)
                })
                .pipe(rename(`${pckg.fileName}.min.js`))
                .pipe(gulp.dest(DEST))
        })
    )
})

gulp.task('all', gulp.series('clean', packages[packages.length - 1].fileName))

gulp.task('default', gulp.series('clean', packages[0].fileName))