diff --git a/apps/jscad-web/examples/AMFImport/index.js b/apps/jscad-web/examples/AMFImport/index.js
index dd707f36..33c83907 100644
--- a/apps/jscad-web/examples/AMFImport/index.js
+++ b/apps/jscad-web/examples/AMFImport/index.js
@@ -1,3 +1,4 @@
+"use strict"
 /**
  * AMF Import Demonstration
  * @category Imports
diff --git a/apps/jscad-web/examples/STLImport/index.js b/apps/jscad-web/examples/STLImport/index.js
index d3c6a2c9..550f1899 100644
--- a/apps/jscad-web/examples/STLImport/index.js
+++ b/apps/jscad-web/examples/STLImport/index.js
@@ -1,3 +1,4 @@
+"use strict"
 /**
  * STL Import Demonstration
  * @category Imports
diff --git a/apps/jscad-web/examples/SVGImport/index.js b/apps/jscad-web/examples/SVGImport/index.js
index 06ca6e87..702953a4 100644
--- a/apps/jscad-web/examples/SVGImport/index.js
+++ b/apps/jscad-web/examples/SVGImport/index.js
@@ -1,3 +1,4 @@
+"use strict"
 /**
  * SVG Import Demonstration
  * @category Imports
diff --git a/apps/jscad-web/examples/balloons.example.js b/apps/jscad-web/examples/balloons.example.js
index 27cf0959..b708c3e5 100644
--- a/apps/jscad-web/examples/balloons.example.js
+++ b/apps/jscad-web/examples/balloons.example.js
@@ -1,3 +1,4 @@
+"use strict"
 /**
  * Birthday Balloons with interactive parameters
  * @authors Z3 Dev, Simon Clark
diff --git a/apps/jscad-web/examples/extrusions.example.js b/apps/jscad-web/examples/extrusions.example.js
index 1dce0ed2..c0927f01 100644
--- a/apps/jscad-web/examples/extrusions.example.js
+++ b/apps/jscad-web/examples/extrusions.example.js
@@ -1,3 +1,4 @@
+"use strict"
 /**
  * Demonstrates the types of extrusions, and the variety of objects they can create.
  */
diff --git a/apps/jscad-web/examples/gear.example.js b/apps/jscad-web/examples/gear.example.js
index f6078d0b..1e3c0525 100644
--- a/apps/jscad-web/examples/gear.example.js
+++ b/apps/jscad-web/examples/gear.example.js
@@ -1,3 +1,4 @@
+"use strict"
 /**
  * Build a Parametric Involute Gear as a parametric design.
  * @authors Joost Nieuwenhuijse, Simon Clark
diff --git a/apps/jscad-web/examples/hulls.example.js b/apps/jscad-web/examples/hulls.example.js
index f4db70ad..3c272543 100644
--- a/apps/jscad-web/examples/hulls.example.js
+++ b/apps/jscad-web/examples/hulls.example.js
@@ -1,3 +1,4 @@
+"use strict"
 /**
  * Demonstrates Hull and Hull Chain operations in 2D and 3D
  */
diff --git a/apps/jscad-web/examples/jscad.example.js b/apps/jscad-web/examples/jscad.example.js
index 54f9f2ff..a8ad46d5 100644
--- a/apps/jscad-web/examples/jscad.example.js
+++ b/apps/jscad-web/examples/jscad.example.js
@@ -1,3 +1,4 @@
+"use strict"
 const jscad = require('@jscad/modeling')
 const { intersect, subtract } = jscad.booleans
 const { colorize } = jscad.colors
diff --git a/apps/jscad-web/examples/multipart.project.template.js b/apps/jscad-web/examples/multipart.project.template.js
index 99d84a7e..2a57fd41 100644
--- a/apps/jscad-web/examples/multipart.project.template.js
+++ b/apps/jscad-web/examples/multipart.project.template.js
@@ -1,3 +1,4 @@
+"use strict"
 /**
  * Demonstrates a multipart project with part select input.
  * 
diff --git a/apps/jscad-web/examples/nuts-and-bolts.example.js b/apps/jscad-web/examples/nuts-and-bolts.example.js
index 2969f283..c2df9ff7 100644
--- a/apps/jscad-web/examples/nuts-and-bolts.example.js
+++ b/apps/jscad-web/examples/nuts-and-bolts.example.js
@@ -1,3 +1,4 @@
+"use strict"
 /**
  * Nuts and Bolts
  * Demonstrates advanced extrusion using slices to generate screw threads.
diff --git a/apps/jscad-web/examples/parameters.example.js b/apps/jscad-web/examples/parameters.example.js
index c8a6fa15..cd2d0073 100644
--- a/apps/jscad-web/examples/parameters.example.js
+++ b/apps/jscad-web/examples/parameters.example.js
@@ -1,3 +1,4 @@
+"use strict"
 /**
  * Demonstrate all available parameter types
  */
diff --git a/apps/jscad-web/examples/primitives.example.js b/apps/jscad-web/examples/primitives.example.js
index 780aadf1..05481634 100644
--- a/apps/jscad-web/examples/primitives.example.js
+++ b/apps/jscad-web/examples/primitives.example.js
@@ -1,3 +1,4 @@
+"use strict"
 /**
  * JSCAD Primitives Demonstration
  * Demonstrates the basics of a variety of 2D and 3D primitives
diff --git a/apps/jscad-web/examples/slicer.example.js b/apps/jscad-web/examples/slicer.example.js
index 472c40ac..e1df9c32 100644
--- a/apps/jscad-web/examples/slicer.example.js
+++ b/apps/jscad-web/examples/slicer.example.js
@@ -1,3 +1,4 @@
+"use strict"
 /**
  * Slice a geometry object into layers
  */
diff --git a/apps/jscad-web/examples/svg.tester.js b/apps/jscad-web/examples/svg.tester.js
index e2c84bb5..20822cc1 100644
--- a/apps/jscad-web/examples/svg.tester.js
+++ b/apps/jscad-web/examples/svg.tester.js
@@ -1,3 +1,4 @@
+"use strict"
 /*
  if you do not see the shape, it couldbe that it is out os view, so zoom out to check
  if you have a single shape svg that is red, it is inverted
diff --git a/apps/jscad-web/examples/text.example.js b/apps/jscad-web/examples/text.example.js
index a2539de4..72aacbc5 100644
--- a/apps/jscad-web/examples/text.example.js
+++ b/apps/jscad-web/examples/text.example.js
@@ -1,3 +1,4 @@
+"use strict"
 /**
  * Demonstrates methods of building 3D text
  * @authors Simon Clark