diff --git a/build/.eslintrc.json b/build/.eslintrc.json
index 76e7f37b6..220b6e1e5 100644
--- a/build/.eslintrc.json
+++ b/build/.eslintrc.json
@@ -4,7 +4,7 @@
     "node": true
   },
   "parserOptions": {
-    "sourceType": "script"
+    "sourceType": "module"
   },
   "extends": "../.eslintrc.json",
   "rules": {
diff --git a/build/build-plugins.js b/build/build-plugins.js
index 22a179066..4e34b54c2 100644
--- a/build/build-plugins.js
+++ b/build/build-plugins.js
@@ -5,8 +5,6 @@
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  */
 
-'use strict'
-
 const rollup  = require('rollup')
 const path    = require('path')
 const babel   = require('rollup-plugin-babel')
diff --git a/build/change-version.js b/build/change-version.js
index 7102dc083..192c62710 100755
--- a/build/change-version.js
+++ b/build/change-version.js
@@ -7,8 +7,6 @@
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  */
 
-'use strict'
-
 const fs = require('fs')
 const path = require('path')
 const sh = require('shelljs')
diff --git a/build/generate-sri.js b/build/generate-sri.js
index 10936e8a1..4d5c25c44 100644
--- a/build/generate-sri.js
+++ b/build/generate-sri.js
@@ -10,8 +10,6 @@
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  */
 
-'use strict'
-
 const fs = require('fs')
 const path = require('path')
 const sriToolbox = require('sri-toolbox')
diff --git a/build/lint-vars.js b/build/lint-vars.js
index 1b8d71cc6..8873d3670 100644
--- a/build/lint-vars.js
+++ b/build/lint-vars.js
@@ -7,8 +7,6 @@
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  */
 
-'use strict'
-
 const fs = require('fs')
 const path = require('path')
 const glob = require('glob')
diff --git a/build/postcss.config.js b/build/postcss.config.js
index 157291ffd..7394ba382 100644
--- a/build/postcss.config.js
+++ b/build/postcss.config.js
@@ -1,5 +1,3 @@
-'use strict'
-
 module.exports = (ctx) => ({
   map: ctx.file.dirname.includes('examples') ? false : {
     inline: false,
diff --git a/build/rollup.config.js b/build/rollup.config.js
index 93370d31d..df88fb304 100644
--- a/build/rollup.config.js
+++ b/build/rollup.config.js
@@ -1,5 +1,3 @@
-'use strict'
-
 const path    = require('path')
 const babel   = require('rollup-plugin-babel')
 const resolve = require('rollup-plugin-node-resolve')
diff --git a/build/saucelabs-unit-test.js b/build/saucelabs-unit-test.js
index b4d952536..a84aa1dfe 100644
--- a/build/saucelabs-unit-test.js
+++ b/build/saucelabs-unit-test.js
@@ -12,8 +12,6 @@ Win Opera 15+ is not currently supported by Sauce Labs
 iOS Chrome is not currently supported by Sauce Labs
 */
 
-'use strict'
-
 const path = require('path')
 const JSUnitSaucelabs = require('jsunitsaucelabs')
 
diff --git a/build/vnu-jar.js b/build/vnu-jar.js
index 111e03409..5fd214a9d 100644
--- a/build/vnu-jar.js
+++ b/build/vnu-jar.js
@@ -7,8 +7,6 @@
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  */
 
-'use strict'
-
 const childProcess = require('child_process')
 const vnu = require('vnu-jar')
 
diff --git a/build/workbox.js b/build/workbox.js
index 3a7ba450a..a8d955158 100644
--- a/build/workbox.js
+++ b/build/workbox.js
@@ -5,8 +5,6 @@
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  */
 
-'use strict'
-
 const fs = require('fs')
 const path = require('path')
 const swBuild = require('workbox-build')