diff --git a/src/rules/condition-builder.js b/src/rules/condition-builder.js
index 41aec607f..00877911c 100644
--- a/src/rules/condition-builder.js
+++ b/src/rules/condition-builder.js
@@ -23,7 +23,7 @@ class ConditionBuilder {
   /**
    * Move to the rule operations
    *
-   * @param {*} fn the optional function to execute
+   * @param {*} [fn] the optional function to execute
    * @returns {operations.OperationBuilder}
    */
   then (fn) {
@@ -60,7 +60,7 @@ class ConditionConf {
 
   /**
      *
-     * @param {*} fn an optional function
+     * @param {*} [fn] an optional function
      * @returns ConditionBuilder
      */
   then (fn) {
diff --git a/src/rules/trigger-builder.js b/src/rules/trigger-builder.js
index cfc9775eb..cc9266beb 100644
--- a/src/rules/trigger-builder.js
+++ b/src/rules/trigger-builder.js
@@ -140,7 +140,7 @@ class TriggerConf {
   /**
    * Move to the rule operations
    *
-   * @param {*} fn the optional function to execute
+   * @param {*} [fn] the optional function to execute
    * @returns {operations.OperationBuilder}
    */
   then (fn) {
diff --git a/types/rules/condition-builder.d.ts b/types/rules/condition-builder.d.ts
index b71388482..e909e14f6 100644
--- a/types/rules/condition-builder.d.ts
+++ b/types/rules/condition-builder.d.ts
@@ -65,10 +65,10 @@ export class ConditionBuilder {
     /**
      * Move to the rule operations
      *
-     * @param {*} fn the optional function to execute
+     * @param {*} [fn] the optional function to execute
      * @returns {operations.OperationBuilder}
      */
-    then(fn: any): operations.OperationBuilder;
+    then(fn?: any): operations.OperationBuilder;
     /**
       * Condition of an item in determining whether to process rule.
       *
diff --git a/types/rules/condition-builder.d.ts.map b/types/rules/condition-builder.d.ts.map
index 7d375a282..eead24b5b 100644
--- a/types/rules/condition-builder.d.ts.map
+++ b/types/rules/condition-builder.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"condition-builder.d.ts","sourceRoot":"","sources":["../../src/rules/condition-builder.js"],"names":[],"mappings":"AAsEA;;;;;;GAMG;AACH;IACE;;;;SAIK;IACL,4CAIC;IAFC,eAAe;IACf,WAAY;IAGd;;;;;;SAMK;IACL,cAEC;CACF;AAED;;;;;;GAMG;AACH;IACE,kDAIC;IAFC,eAAe;IACf,kBAAyB;IAG3B;;;;SAIK;IACL,gBAFe,IAAI,CAKlB;IAFC,cAAqB;IAIvB;;;;SAIK;IACL,cAHiB,GAAG,KACL,IAAI,CAKlB;IAED,+BAMC;CACF;AA3ID;;;;GAIG;AACH;IACE,mCAKC;IAJC,eAAe;IACf,iBAAuB;IACvB,eAAe;IACf,YAAa;IAGf,eAAe;IACf,cAGC;IAED;;;;;OAKG;IACH,eAFa,WAAW,gBAAgB,CASvC;IAED;;;;;;QAMI;IACJ,sBAHY,MAAM,GACJ,sBAAsB,CAKnC;IAFC,kCAA2D;CAG9D"}
\ No newline at end of file
+{"version":3,"file":"condition-builder.d.ts","sourceRoot":"","sources":["../../src/rules/condition-builder.js"],"names":[],"mappings":"AAsEA;;;;;;GAMG;AACH;IACE;;;;SAIK;IACL,4CAIC;IAFC,eAAe;IACf,WAAY;IAGd;;;;;;SAMK;IACL,cAEC;CACF;AAED;;;;;;GAMG;AACH;IACE,kDAIC;IAFC,eAAe;IACf,kBAAyB;IAG3B;;;;SAIK;IACL,gBAFe,IAAI,CAKlB;IAFC,cAAqB;IAIvB;;;;SAIK;IACL,cAHiB,GAAG,KACL,IAAI,CAKlB;IAED,+BAMC;CACF;AA3ID;;;;GAIG;AACH;IACE,mCAKC;IAJC,eAAe;IACf,iBAAuB;IACvB,eAAe;IACf,YAAa;IAGf,eAAe;IACf,cAGC;IAED;;;;;OAKG;IACH,gBAFa,WAAW,gBAAgB,CASvC;IAED;;;;;;QAMI;IACJ,sBAHY,MAAM,GACJ,sBAAsB,CAKnC;IAFC,kCAA2D;CAG9D"}
\ No newline at end of file
diff --git a/types/rules/trigger-builder.d.ts b/types/rules/trigger-builder.d.ts
index 2ebf13c95..ab64a943c 100644
--- a/types/rules/trigger-builder.d.ts
+++ b/types/rules/trigger-builder.d.ts
@@ -319,10 +319,10 @@ declare class TriggerConf {
     /**
      * Move to the rule operations
      *
-     * @param {*} fn the optional function to execute
+     * @param {*} [fn] the optional function to execute
      * @returns {operations.OperationBuilder}
      */
-    then(fn: any): operations.OperationBuilder;
+    then(fn?: any): operations.OperationBuilder;
     /**
      * Move to the rule condition
      *
diff --git a/types/rules/trigger-builder.d.ts.map b/types/rules/trigger-builder.d.ts.map
index 4ecb7bde9..5b2bc4232 100644
--- a/types/rules/trigger-builder.d.ts.map
+++ b/types/rules/trigger-builder.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"trigger-builder.d.ts","sourceRoot":"","sources":["../../src/rules/trigger-builder.js"],"names":[],"mappings":"AAgNA;;;;;;GAMG;AACH;IACE,+CAUC;IARC,eAAe;IACf,gBAAsB;IACtB,eAAe;IACf,kBAA2B;IAC3B,eAAe;IACf,sBAAsE;IACtE,eAAe;IACf,iBAAgG;CAEnG;AAnED;;;;GAIG;AACH;IACE,mDAIC;IAFC,iBAA8B;IAC9B,mCAA2F;IAG7F,eAAe;IACf,iBAMC;IAED;;;;;OAKG;IACH,cAHW,MAAM,GACJ,oBAAoB,CAIhC;IAED;;;;;OAKG;IACH,qBAHW,MAAM,GACJ,oBAAoB,CAKhC;IAFC,kBAAgC;IAIlC,eAAe;IACf,kBAEC;CACF;AA4CD;;;;;;GAMG;AACH;IACE,gEAYC;IAVC,aAAyC;IAKzC,eAAe;IACf,kBAA2B;IA8G7B,eAAe;IACf,iBA6BC;IAzIC,oBAOW,iBAAiB,CAPX;IAGnB;;;;;OAKG;IACH,gBAFa,iBAAiB,CAK7B;IAFC,cAAqB;IAIvB;;;;OAIG;IACH,kBAFa,iBAAiB,CAQ7B;IAFC,gBAAuB;IAIzB;;;;OAIG;IACH,SAFa,iBAAiB,CAI7B;IAED;;;;OAIG;IACH,QAFa,iBAAiB,CAI7B;IAED;;;;OAIG;IACH,WAFa,iBAAiB,CAI7B;IAED;;;;OAIG;IACH,UAFa,iBAAiB,CAI7B;IAED;;;;OAIG;IACH,mBAFa,iBAAiB,CAK7B;IAFC,gBAAgC;IAIlC;;;;OAIG;IACH,kBAFa,iBAAiB,CAK7B;IAED;;;;OAIG;IACH,WAFa,iBAAiB,CAK7B;IAED;;;;OAIG;IACH,oBAFa,iBAAiB,CAI7B;IAED,eAAe;IACf,kBAEC;IAkCD,eAAe;IACf,sBAwBC;IAED,eAAe;IACf,qBAcC;CACF;AAED;;;;;;GAMG;AACH;IACE,gDAIC;IAFC,eAAe;IACf,iBAAwB;IAG1B,eAAe;IACf,kBAEC;IAED,eAAe;IACf,iBAmBC;IAED;;;;OAIG;IACH,WAFa,kBAAkB,CAK9B;IAFC,gBAAwB;IAI1B;;;;OAIG;IACH,WAFa,kBAAkB,CAK9B;IAED;;;;OAIG;IACH,kBAFa,kBAAkB,CAQ9B;IAFC,gBAAuB;IAIzB;;;;OAIG;IACH,gBAFa,kBAAkB,CAK9B;IAFC,cAAqB;IAIvB,eAAe;IACf,sBASC;CACF;AAED;;;;;;GAMG;AACH;IAGI,mCAAyE;IACzE,mCAA8F;IAGhG,eAAe;IACf,kBAEC;IAED;;;;OAIG;IACH,eAFa,mBAAmB,CAI/B;IAED;;;;OAIG;IACH,qBAFa,mBAAmB,CAI/B;IAED;;;;OAIG;IACH,yBAFa,mBAAmB,CAI/B;IAED;;;;OAIG;IACH,qBAFa,mBAAmB,CAI/B;IAED;;;;OAIG;IACH,mBAFa,mBAAmB,CAI/B;IAED;;;;;OAKG;IACH,kBAHW,MAAM,GACJ,mBAAmB,CAQ/B;IAFC,cAAkB;CAGrB;AA/mBD;;;;GAIG;AACH;IACE,0BAGC;IAFC,eAAe;IACf,iBAAuB;IAGzB,eAAe;IACf,oBAGC;IAFC,oBAA6B;IAI/B,eAAe;IACf,YAGC;IAED,eAAe;IACf,cAGC;IAED,eAAe;IACf,YAGC;IAED;;;;;OAKG;IACH,qBAHW,MAAM,GACJ,oBAAoB,CAIhC;IAED;;;;;OAKG;IACH,qBAHW,MAAM,GACJ,iBAAiB,CAI7B;IAED;;;;;OAKG;IACH,gBAHW,MAAM,GACJ,sBAAsB,CAIlC;IAED;;;;;OAKG;IACH,eAHW,MAAM,GACJ,iBAAiB,CAI7B;IAED;;;;;OAKG;IACH,oBAHW,MAAM,GACJ,iBAAiB,CAI7B;IAED;;;;;OAKG;IACH,gBAHW,MAAM,GACJ,kBAAkB,CAI9B;IAED;;;;;OAKG;IACH,UAFa,mBAAmB,CAI/B;IAED;;;;;OAKG;IACH,mBAHW,MAAM,GACJ,qBAAqB,CAIjC;CACF;AAED;;;GAGG;AACH;IACE,iCAGC;IAFC,eAAe;IACf,uBAAoC;IAGtC;;;;OAIG;IACH,MAFa,cAAc,CAI1B;IAED;;;;;OAKG;IACH,eAFa,WAAW,gBAAgB,CAIvC;IAED;;;;;OAKG;IACH,aAFa,WAAW,gBAAgB,CAIvC;CACF;AAuED;;;;;;GAMG;AACH;IACE,+CAUC;IARC,eAAe;IACf,gBAAsB;IACtB,eAAe;IACf,kBAA2B;IAC3B,eAAe;IACf,sBAAoE;IACpE,eAAe;IACf,iBAA4G;CAE/G;AA6XD;;;;;;GAMG;AACH;IACE,gDAYC;IAVC,eAAe;IACf,kBAAyB;IACzB,eAAe;IACf,kBAAsB;IACtB,eAAe;IACf,kBAA2B;IAC3B,eAAe;IACf,sBAAqF;IACrF,eAAe;IACf,iBAAwJ;IAG1J;;;;;OAKG;IACH,oBAHW,OAAO,GACL,qBAAqB,CAKjC;CACF"}
\ No newline at end of file
+{"version":3,"file":"trigger-builder.d.ts","sourceRoot":"","sources":["../../src/rules/trigger-builder.js"],"names":[],"mappings":"AAgNA;;;;;;GAMG;AACH;IACE,+CAUC;IARC,eAAe;IACf,gBAAsB;IACtB,eAAe;IACf,kBAA2B;IAC3B,eAAe;IACf,sBAAsE;IACtE,eAAe;IACf,iBAAgG;CAEnG;AAnED;;;;GAIG;AACH;IACE,mDAIC;IAFC,iBAA8B;IAC9B,mCAA2F;IAG7F,eAAe;IACf,iBAMC;IAED;;;;;OAKG;IACH,cAHW,MAAM,GACJ,oBAAoB,CAIhC;IAED;;;;;OAKG;IACH,qBAHW,MAAM,GACJ,oBAAoB,CAKhC;IAFC,kBAAgC;IAIlC,eAAe;IACf,kBAEC;CACF;AA4CD;;;;;;GAMG;AACH;IACE,gEAYC;IAVC,aAAyC;IAKzC,eAAe;IACf,kBAA2B;IA8G7B,eAAe;IACf,iBA6BC;IAzIC,oBAOW,iBAAiB,CAPX;IAGnB;;;;;OAKG;IACH,gBAFa,iBAAiB,CAK7B;IAFC,cAAqB;IAIvB;;;;OAIG;IACH,kBAFa,iBAAiB,CAQ7B;IAFC,gBAAuB;IAIzB;;;;OAIG;IACH,SAFa,iBAAiB,CAI7B;IAED;;;;OAIG;IACH,QAFa,iBAAiB,CAI7B;IAED;;;;OAIG;IACH,WAFa,iBAAiB,CAI7B;IAED;;;;OAIG;IACH,UAFa,iBAAiB,CAI7B;IAED;;;;OAIG;IACH,mBAFa,iBAAiB,CAK7B;IAFC,gBAAgC;IAIlC;;;;OAIG;IACH,kBAFa,iBAAiB,CAK7B;IAED;;;;OAIG;IACH,WAFa,iBAAiB,CAK7B;IAED;;;;OAIG;IACH,oBAFa,iBAAiB,CAI7B;IAED,eAAe;IACf,kBAEC;IAkCD,eAAe;IACf,sBAwBC;IAED,eAAe;IACf,qBAcC;CACF;AAED;;;;;;GAMG;AACH;IACE,gDAIC;IAFC,eAAe;IACf,iBAAwB;IAG1B,eAAe;IACf,kBAEC;IAED,eAAe;IACf,iBAmBC;IAED;;;;OAIG;IACH,WAFa,kBAAkB,CAK9B;IAFC,gBAAwB;IAI1B;;;;OAIG;IACH,WAFa,kBAAkB,CAK9B;IAED;;;;OAIG;IACH,kBAFa,kBAAkB,CAQ9B;IAFC,gBAAuB;IAIzB;;;;OAIG;IACH,gBAFa,kBAAkB,CAK9B;IAFC,cAAqB;IAIvB,eAAe;IACf,sBASC;CACF;AAED;;;;;;GAMG;AACH;IAGI,mCAAyE;IACzE,mCAA8F;IAGhG,eAAe;IACf,kBAEC;IAED;;;;OAIG;IACH,eAFa,mBAAmB,CAI/B;IAED;;;;OAIG;IACH,qBAFa,mBAAmB,CAI/B;IAED;;;;OAIG;IACH,yBAFa,mBAAmB,CAI/B;IAED;;;;OAIG;IACH,qBAFa,mBAAmB,CAI/B;IAED;;;;OAIG;IACH,mBAFa,mBAAmB,CAI/B;IAED;;;;;OAKG;IACH,kBAHW,MAAM,GACJ,mBAAmB,CAQ/B;IAFC,cAAkB;CAGrB;AA/mBD;;;;GAIG;AACH;IACE,0BAGC;IAFC,eAAe;IACf,iBAAuB;IAGzB,eAAe;IACf,oBAGC;IAFC,oBAA6B;IAI/B,eAAe;IACf,YAGC;IAED,eAAe;IACf,cAGC;IAED,eAAe;IACf,YAGC;IAED;;;;;OAKG;IACH,qBAHW,MAAM,GACJ,oBAAoB,CAIhC;IAED;;;;;OAKG;IACH,qBAHW,MAAM,GACJ,iBAAiB,CAI7B;IAED;;;;;OAKG;IACH,gBAHW,MAAM,GACJ,sBAAsB,CAIlC;IAED;;;;;OAKG;IACH,eAHW,MAAM,GACJ,iBAAiB,CAI7B;IAED;;;;;OAKG;IACH,oBAHW,MAAM,GACJ,iBAAiB,CAI7B;IAED;;;;;OAKG;IACH,gBAHW,MAAM,GACJ,kBAAkB,CAI9B;IAED;;;;;OAKG;IACH,UAFa,mBAAmB,CAI/B;IAED;;;;;OAKG;IACH,mBAHW,MAAM,GACJ,qBAAqB,CAIjC;CACF;AAED;;;GAGG;AACH;IACE,iCAGC;IAFC,eAAe;IACf,uBAAoC;IAGtC;;;;OAIG;IACH,MAFa,cAAc,CAI1B;IAED;;;;;OAKG;IACH,gBAFa,WAAW,gBAAgB,CAIvC;IAED;;;;;OAKG;IACH,aAFa,WAAW,gBAAgB,CAIvC;CACF;AAuED;;;;;;GAMG;AACH;IACE,+CAUC;IARC,eAAe;IACf,gBAAsB;IACtB,eAAe;IACf,kBAA2B;IAC3B,eAAe;IACf,sBAAoE;IACpE,eAAe;IACf,iBAA4G;CAE/G;AA6XD;;;;;;GAMG;AACH;IACE,gDAYC;IAVC,eAAe;IACf,kBAAyB;IACzB,eAAe;IACf,kBAAsB;IACtB,eAAe;IACf,kBAA2B;IAC3B,eAAe;IACf,sBAAqF;IACrF,eAAe;IACf,iBAAwJ;IAG1J;;;;;OAKG;IACH,oBAHW,OAAO,GACL,qBAAqB,CAKjC;CACF"}
\ No newline at end of file