diff --git a/src/diagrams/classDiagram/classRenderer.js b/src/diagrams/classDiagram/classRenderer.js
index 6632d2258..894d8c4d0 100644
--- a/src/diagrams/classDiagram/classRenderer.js
+++ b/src/diagrams/classDiagram/classRenderer.js
@@ -362,3 +362,8 @@ export const draw = function (text, id) {
   diagram.attr('width', '100%')
   diagram.attr('viewBox', '0 0 ' + (g.graph().width + 20) + ' ' + (g.graph().height + 20))
 }
+
+export default {
+  setConf,
+  draw
+}
diff --git a/src/diagrams/example/exampleDb.js b/src/diagrams/example/exampleDb.js
index 428b187fc..0bc9b7649 100644
--- a/src/diagrams/example/exampleDb.js
+++ b/src/diagrams/example/exampleDb.js
@@ -19,3 +19,10 @@ export const setInfo = function (inf) {
 export const getInfo = function () {
   return info
 }
+
+export default {
+  setMessage,
+  getMessage,
+  setInfo,
+  getInfo
+}
diff --git a/src/diagrams/example/exampleRenderer.js b/src/diagrams/example/exampleRenderer.js
index 246d4b60e..8c3f024a2 100644
--- a/src/diagrams/example/exampleRenderer.js
+++ b/src/diagrams/example/exampleRenderer.js
@@ -33,3 +33,7 @@ export const draw = function (txt, id, ver) {
   svg.attr('height', 100)
   svg.attr('width', 400)
 }
+
+export default {
+  draw
+}
diff --git a/src/diagrams/flowchart/flowRenderer.js b/src/diagrams/flowchart/flowRenderer.js
index 07d86795d..64b42ba61 100644
--- a/src/diagrams/flowchart/flowRenderer.js
+++ b/src/diagrams/flowchart/flowRenderer.js
@@ -501,3 +501,11 @@ export const draw = function (text, id, isDot) {
     }
   }
 }
+
+export default {
+  setConf,
+  addVertices,
+  addEdges,
+  getClasses,
+  draw
+}
diff --git a/src/diagrams/gantt/ganttRenderer.js b/src/diagrams/gantt/ganttRenderer.js
index 11e6b2723..0bb298132 100644
--- a/src/diagrams/gantt/ganttRenderer.js
+++ b/src/diagrams/gantt/ganttRenderer.js
@@ -401,3 +401,8 @@ export const draw = function (text, id) {
     return getCounts(arr)[word] || 0
   }
 }
+
+export default {
+  setConf,
+  draw
+}
diff --git a/src/diagrams/gitGraph/gitGraphRenderer.js b/src/diagrams/gitGraph/gitGraphRenderer.js
index 42fd56fe8..882ec31f7 100644
--- a/src/diagrams/gitGraph/gitGraphRenderer.js
+++ b/src/diagrams/gitGraph/gitGraphRenderer.js
@@ -272,3 +272,8 @@ export const draw = function (txt, id, ver) {
     logger.error(e.message)
   }
 }
+
+export default {
+  setConf,
+  draw
+}
diff --git a/src/diagrams/sequenceDiagram/sequenceRenderer.js b/src/diagrams/sequenceDiagram/sequenceRenderer.js
index fa81ee545..37335316a 100644
--- a/src/diagrams/sequenceDiagram/sequenceRenderer.js
+++ b/src/diagrams/sequenceDiagram/sequenceRenderer.js
@@ -501,3 +501,10 @@ export const draw = function (text, id) {
   var extraVertForTitle = title ? 40 : 0
   diagram.attr('viewBox', (box.startx - conf.diagramMarginX) + ' -' + (conf.diagramMarginY + extraVertForTitle) + ' ' + width + ' ' + (height + extraVertForTitle))
 }
+
+export default {
+  bounds,
+  drawActors,
+  setConf,
+  draw
+}
diff --git a/src/diagrams/sequenceDiagram/svgDraw.js b/src/diagrams/sequenceDiagram/svgDraw.js
index 431b6bb77..ca5eb9cd7 100644
--- a/src/diagrams/sequenceDiagram/svgDraw.js
+++ b/src/diagrams/sequenceDiagram/svgDraw.js
@@ -314,3 +314,17 @@ var _drawTextCandidateFunc = (function () {
       conf.textPlacement === 'old' ? byText : byTspan)
   }
 })()
+
+export default {
+  drawRect,
+  drawText,
+  drawLabel,
+  drawActor,
+  anchorElement,
+  drawActivation,
+  drawLoop,
+  insertArrowHead,
+  insertArrowCrossHead,
+  getTextObj,
+  getNoteRect
+}