Just make the build steps sequential, build single target with buble

build_src.js

@@ -1,4 +1,5 @@
 /* eslint-disable no-console */
+const buble = require('@rollup/plugin-buble');
 const colors = require('colors/safe');
 const commonjs = require('rollup-plugin-commonjs');
 const includePaths = require('rollup-plugin-includepaths');
@@ -6,45 +7,24 @@ const json = require('rollup-plugin-json');
 const nodeResolve = require('rollup-plugin-node-resolve');
 const rollup = require('rollup');
 const shell = require('shelljs');
-const visualizer = require('rollup-plugin-visualizer');
+// const visualizer = require('rollup-plugin-visualizer');
 
 let _currBuild = null;
 
-// rollup plugin options
-const INCLUDEPATHSOPTS = {
-  paths: ['node_modules/d3/node_modules'],  // npm2 or windows
-  include: {
-    'martinez-polygon-clipping': 'node_modules/martinez-polygon-clipping/dist/martinez.umd.js'
-  }
-};
-const NODERESOLVEOPTS = {
-  mainFields: ['module', 'main'],
-  browser: false,
-  dedupe: ['object-inspect']
-};
-const JSONOPTS = {
-  indent: ''
-};
-
-
-
-// if called directly, do the thing.
-buildSrc();
-
 
 function buildSrc() {
   if (_currBuild) return _currBuild;
 
-  const START = '🏗   ' + colors.yellow('Building bundles...');
-  const END = '👍  ' + colors.green('bundles built');
+  const START = '🏗   ' + colors.yellow('Building source...');
+  const END = '👍  ' + colors.green('source built');
 
   console.log('');
   console.log(START);
   console.time(END);
 
   return _currBuild =
-    buildModern()
-    // .then(() => buildES5())
+    Promise.resolve()
+    .then(() => buildBundle())
     .then(() => {
       console.timeEnd(END);
       console.log('');
@@ -59,13 +39,14 @@ function buildSrc() {
 };
 
 
-function buildModern() {
-  console.log('📦   ' + colors.yellow('Bundling modern JavaScript...'));
+function buildBundle() {
+  console.log('📦    ' + colors.yellow('Bundling JavaScript...'));
 
   // Start clean
   shell.rm('-f', [
     'dist/iD.js',
-    'dist/iD.js.map'
+    'dist/iD.js.map',
+    // 'docs/statistics.html'
   ]);
 
   let prom =
@@ -73,10 +54,25 @@ function buildModern() {
       input: './modules/id.js',
       onwarn: onWarn,
       plugins: [
-        includePaths(INCLUDEPATHSOPTS),
-        nodeResolve(NODERESOLVEOPTS),
+        includePaths({
+          paths: ['node_modules/d3/node_modules'],  // npm2 or windows
+          include: {
+            'martinez-polygon-clipping': 'node_modules/martinez-polygon-clipping/dist/martinez.umd.js'
+          }
+        }),
+        nodeResolve({
+          mainFields: ['module', 'main'],
+          browser: false,
+          dedupe: ['object-inspect']
+        }),
         commonjs(),
-        json(JSONOPTS)
+        json({ indent: '' }),
+        buble(),
+        // viz causes src build to take about 3x longer; skip
+        // visualizer({
+        //   filename: 'docs/statistics.html',
+        //   sourcemap: true
+        // })
       ]
     })
     .then((bundle) => {
@@ -92,62 +88,6 @@ function buildModern() {
 };
 
 
-function buildES5() {
-  console.log('📦   ' + colors.yellow('Bundling ES5 JavaScript...'));
-
-  // Start clean
-  shell.rm('-f', [
-    'dist/iD.es5.js',
-    'dist/iD.es5.js.map'
-  ]);
-
-  let prom =
-    rollup.rollup({
-      input: './modules/id.js',
-      plugins: [
-        includePaths(INCLUDEPATHSOPTS),
-        nodeResolve(NODERESOLVEOPTS),
-        commonjs(),
-        json(JSONOPTS)
-      ]
-    })
-    .then((bundle) => {
-      return bundle.write({
-        format: 'iife',
-        file: 'dist/iD.es5.js',
-        sourcemap: true,
-        strict: false
-      });
-    });
-
-  return prom;
-};
-
-
-function buildStats() {
-  console.log('📦   ' + colors.yellow('Building statistics...'));
-
-  // Start clean
-  shell.rm('-f', [
-    'docs/statistics.html'
-  ]);
-
-  return
-    rollup.rollup({
-      input: './modules/id.js',
-      plugins: [
-        includePaths(INCLUDEPATHSOPTS),
-        nodeResolve(NODERESOLVEOPTS),
-        commonjs(),
-        json(JSONOPTS),
-        visualizer({
-          filename: 'docs/statistics.html',
-          sourcemap: true
-        })
-      ]
-    });
-};
-
 function onWarn(warning, warn) {
   // skip certain warnings
   if (warning.code === 'CIRCULAR_DEPENDENCY') return;