diff --git a/types/highcharts/test/highstock.ts b/types/highcharts/test/highstock.ts
index f1a464f491..e80e0cb7a3 100644
--- a/types/highcharts/test/highstock.ts
+++ b/types/highcharts/test/highstock.ts
@@ -66,7 +66,7 @@ $(() => {
             }
         },
 
-        series: [<Highcharts.AreaRangeChartSeriesOptions> {
+        series: [{
             name: 'USD to EUR',
             data: someData,
             lineColor: "blue"
diff --git a/types/highcharts/test/index.ts b/types/highcharts/test/index.ts
index c1fd8b5676..2bb429ec7a 100644
--- a/types/highcharts/test/index.ts
+++ b/types/highcharts/test/index.ts
@@ -40,12 +40,12 @@ function originalTests() {
             renderTo: "container"
         },
         xAxis: {},
-        series: [<Highcharts.LineChartSeriesOptions> {
+        series: [{
             data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4],
             description: "foo",
             type: "line",
             allowPointSelect: true
-        }]
+        } as Highcharts.LineChartSeriesOptions]
     });
 
     chart1.addSeries({
@@ -61,7 +61,7 @@ function originalTests() {
             height: 400,
             spacingRight: 20
         },
-        xAxis: [<Highcharts.AxisOptions> {
+        xAxis: [{
             description: 'x-foo',
             min: 1,
             max: 1000,
@@ -71,7 +71,7 @@ function originalTests() {
             gridLineWidth: 1,
             type: 'logarithmic'
         }],
-        yAxis: [<Highcharts.AxisOptions> {
+        yAxis: [{
             description: 'y-foo',
             min: 1,
             max: 1000,
@@ -85,7 +85,7 @@ function originalTests() {
         legend: {
             enabled: false
         },
-        series: [<Highcharts.ScatterChartSeriesOptions> {
+        series: [{
             data: [
                 [550, 870], [738, 362], [719, 711], [547, 665], [595, 197], [332, 144],
                 [581, 555], [196, 862], [6, 837], [400, 924], [888, 148], [785, 730],
@@ -114,12 +114,12 @@ function originalTests() {
             renderTo: "container"
         },
         xAxis: {},
-        series: [<Highcharts.ColumnRangeChartSeriesOptions> {
+        series: [{
             data: [[1, 1, 2], [2, 2, 3], [3, 2, 3]],
             description: "foo",
             type: "columnrange",
             allowPointSelect: true
-        }]
+        } as Highcharts.ColumnRangeChartSeriesOptions]
     });
 
     const chart4 = new Highcharts.Chart({
@@ -127,12 +127,12 @@ function originalTests() {
             renderTo: "container"
         },
         xAxis: {},
-        series: [<Highcharts.ColumnRangeChartSeriesOptions> {
+        series: [{
             data: [["01-01-2018", 1, 2], ["02-01-2018", 2, 3], ["03-01-2018", 2, 3]],
             description: "column range data",
             type: "columnrange",
             allowPointSelect: true
-        }]
+        } as Highcharts.ColumnRangeChartSeriesOptions]
     });
 
     const div: HTMLDivElement = null as any;
@@ -146,7 +146,7 @@ function originalTests() {
         },
         xAxis: [{
         }],
-        series: [<Highcharts.PieChartSeriesOptions> {
+        series: [{
             data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
         }]
     };
@@ -164,47 +164,47 @@ function originalTests() {
 
     const renderToIdChart = new Highcharts.Chart("container", {
         xAxis: {},
-        series: [<Highcharts.LineChartSeriesOptions> {
+        series: [{
             data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4],
             type: "line",
             allowPointSelect: true
-        }]
+        } as Highcharts.LineChartSeriesOptions]
     });
 
     const renderToElementChart = new Highcharts.Chart(div, {
         xAxis: {},
-        series: [<Highcharts.LineChartSeriesOptions> {
+        series: [{
             data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4],
             type: "line",
             allowPointSelect: true
-        }]
+        } as Highcharts.LineChartSeriesOptions]
     });
 
     const createWithFunction = Highcharts.chart({
         xAxis: {},
-        series: [<Highcharts.LineChartSeriesOptions> {
+        series: [{
             data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4],
             type: "line",
             allowPointSelect: true
-        }]
+        } as Highcharts.LineChartSeriesOptions]
     });
 
     const createWithFunctionRenderToId = Highcharts.chart("container", {
         xAxis: {},
-        series: [<Highcharts.LineChartSeriesOptions> {
+        series: [{
             data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4],
             type: "line",
             allowPointSelect: true
-        }]
+        } as Highcharts.LineChartSeriesOptions]
     });
 
     const createWithFunctionRenderToElement = Highcharts.chart(div, {
         xAxis: {},
-        series: [<Highcharts.LineChartSeriesOptions> {
+        series: [{
             data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4],
             type: "line",
             allowPointSelect: true
-        }]
+        } as Highcharts.LineChartSeriesOptions]
     });
 }
 
@@ -245,7 +245,7 @@ function test_ChartOptions() {
             duration: 500,
             easing: "linear"
         },
-        backgroundColor: <Highcharts.Gradient> {
+        backgroundColor: {
             linearGradient: {
                 x1: 0,
                 y1: 0,
@@ -261,7 +261,7 @@ function test_ChartOptions() {
         colorCount: 42,
         defaultSeriesType: "deprecated",
         description: "an arbitrary description",
-        events: <Highcharts.ChartEvents> {
+        events: {
             addSeries: () => { },
             afterPrint: () => { },
             beforePrint: () => { },
@@ -281,21 +281,21 @@ function test_ChartOptions() {
         marginLeft: 10,
         marginRight: 10,
         marginTop: 10,
-        options3d: <Highcharts.ChartOptions3d> {
+        options3d: {
             alpha: 20,
             beta: 20,
             depth: 50,
             enabled: true,
             frame: {
-                back: <Highcharts.ChartOptions3dFrame> {
+                back: {
                     color: "black",
                     size: 2
                 },
-                bottom: <Highcharts.ChartOptions3dFrame> {
+                bottom: {
                     color: "black",
                     size: 2
                 },
-                side: <Highcharts.ChartOptions3dFrame> {
+                side: {
                     color: "black",
                     size: 2
                 }
@@ -309,7 +309,7 @@ function test_ChartOptions() {
         plotBackgroundImage: "http://image.url/image.jpg",
         plotBorderColor: "grey",
         plotBorderWidth: 5,
-        plotShadow: <Highcharts.Shadow> {
+        plotShadow: {
             color: "magenta",
             offsetX: 10,
             offsetY: 10,
@@ -319,15 +319,15 @@ function test_ChartOptions() {
         polar: true,
         reflow: false,
         renderTo: "elementId",
-        resetZoomButton: <Highcharts.ChartResetZoomButton> {
-            position: <Highcharts.Position> {
+        resetZoomButton: {
+            position: {
                 align: "left",
                 verticalAlign: "top",
                 x: 5,
                 y: 5
             },
             relativeTo: "chart",
-            theme: <Highcharts.ButtonTheme> {
+            theme: {
                 display: "hidden",
                 fill: "black",
                 stroke: "white",
@@ -394,7 +394,7 @@ function test_ChartOptions() {
     });
 
     // animation example
-    $('#container').highcharts(<Highcharts.Options> {
+    $('#container').highcharts({
         chart: {
             animation: {
                 duration: 1500,
@@ -479,7 +479,7 @@ function test_ChartOptions() {
         chart: {
             events: {
                 addSeries() {
-                    const label = (<Highcharts.ChartObject> this).renderer.label('A series was added, about to redraw chart', 100, 120)
+                    const label = (this as Highcharts.ChartObject).renderer.label('A series was added, about to redraw chart', 100, 120)
                         .attr({
                             fill: Highcharts.getOptions().colors[0],
                             padding: 10,
@@ -729,21 +729,21 @@ function test_Data() {
             }
         },
         series: [
-            <Highcharts.LineChartSeriesOptions> {
+            {
                 lineWidth: 1
             },
-            <Highcharts.AreaSplineChartSeriesOptions> {
+            {
                 type: 'areaspline',
                 color: '#c4392d',
                 negativeColor: '#5679c4',
                 fillOpacity: 0.5
-            }
+            } as Highcharts.AreaSplineChartSeriesOptions
         ]
     });
 
     // limited data example
     $('#container').highcharts({
-        data: <Highcharts.DataOptions> {
+        data: {
             csv: document.getElementById('csv').innerHTML,
             startRow: 114,
             endRow: 134,
@@ -753,7 +753,7 @@ function test_Data() {
         xAxis: {
             allowDecimals: false
         },
-        series: [<Highcharts.LineChartSeriesOptions> {
+        series: [{
             name: 'Annual mean'
         }]
     });
@@ -784,14 +784,14 @@ function test_Drilldown() {
             type: 'category'
         },
         plotOptions: {
-            series: <Highcharts.ColumnChart> {
+            series: {
                 borderWidth: 0,
                 dataLabels: {
                     enabled: true
                 }
-            }
+            } as Highcharts.ColumnChart
         },
-        series: [<Highcharts.ColumnChartSeriesOptions> {
+        series: [{
             name: '2010',
             data: [{
                 name: 'Republican',
@@ -806,7 +806,7 @@ function test_Drilldown() {
                 y: 4,
                 drilldown: 'other-2010'
             }]
-        }, <Highcharts.ColumnChartSeriesOptions> {
+        }, {
             name: '2014',
             data: [{
                 name: 'Republican',
@@ -823,7 +823,7 @@ function test_Drilldown() {
             }]
         }],
         drilldown: {
-            series: [<Highcharts.ColumnChartSeriesOptions> {
+            series: [{
                 id: 'republican-2010',
                 data: [
                     ['East', 4],
@@ -831,7 +831,7 @@ function test_Drilldown() {
                     ['North', 1],
                     ['South', 4]
                 ]
-            }, <Highcharts.ColumnChartSeriesOptions> {
+            }, {
                 id: 'democrats-2010',
                 data: [
                     ['East', 6],
@@ -839,7 +839,7 @@ function test_Drilldown() {
                     ['North', 2],
                     ['South', 4]
                 ]
-            }, <Highcharts.ColumnChartSeriesOptions> {
+            }, {
                 id: 'other-2010',
                 data: [
                     ['East', 2],
@@ -847,7 +847,7 @@ function test_Drilldown() {
                     ['North', 3],
                     ['South', 2]
                 ]
-            }, <Highcharts.ColumnChartSeriesOptions> {
+            }, {
                 id: 'republican-2014',
                 data: [
                     ['East', 2],
@@ -855,7 +855,7 @@ function test_Drilldown() {
                     ['North', 1],
                     ['South', 7]
                 ]
-            }, <Highcharts.ColumnChartSeriesOptions> {
+            }, {
                 id: 'democrats-2014',
                 data: [
                     ['East', 4],
@@ -863,7 +863,7 @@ function test_Drilldown() {
                     ['North', 5],
                     ['South', 3]
                 ]
-            }, <Highcharts.ColumnChartSeriesOptions> {
+            }, {
                 id: 'other-2014',
                 data: [
                     ['East', 7],
@@ -881,14 +881,14 @@ function test_Drilldown() {
             type: 'column'
         },
         plotOptions: {
-            series: <Highcharts.ColumnChart> {
+            series: {
                 borderWidth: 0,
                 dataLabels: {
                     enabled: true
                 }
-            }
+            } as Highcharts.ColumnChart
         },
-        series: [<Highcharts.ColumnChartSeriesOptions> {
+        series: [{
             name: 'Things',
             colorByPoint: true,
             data: [{
@@ -903,7 +903,7 @@ function test_Drilldown() {
                 name: 'Cars',
                 y: 4
             }]
-        }],
+        } as Highcharts.ColumnChartSeriesOptions],
         drilldown: {
             activeAxisLabelStyle: {
                 textDecoration: 'none',
@@ -976,7 +976,7 @@ function test_Exporting() {
         series: [{
             data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
         }],
-        exporting: <Highcharts.ExportingOptions> {
+        exporting: {
             error: () => {
                 console.log('succesfully asserted exporting.error');
             },
@@ -987,7 +987,7 @@ function test_Exporting() {
             chartOptions: {
                 subtitle: null
             }
-        }
+        } as Highcharts.ExportingOptions
     });
 }
 
@@ -1113,12 +1113,12 @@ function test_AreaOptions() {
             categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
         },
         plotOptions: {
-            series: <Highcharts.AreaChartSeriesOptions> {
+            series: {
                 fillColor: {
                     linearGradient: [0, 0, 0, 300],
                     stops: [
                         [0, Highcharts.getOptions().colors[0]],
-                        [1, (<Highcharts.Gradient> Highcharts.Color(Highcharts.getOptions().colors[0])).setOpacity(0).get('rgba')]
+                        [1, ((Highcharts.Color(Highcharts.getOptions().colors[0])) as Highcharts.Gradient).setOpacity(0).get('rgba')]
                     ]
                 },
                 fillOpacity: 0.1,
@@ -1129,7 +1129,7 @@ function test_AreaOptions() {
                 threshold: 100,
                 trackByArea: true,
                 stickyTracking: false // to show the difference in tracking
-            }
+            } as Highcharts.AreaChartSeriesOptions
         },
         series: [{
             data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
@@ -1146,7 +1146,7 @@ function test_AreaRange() {
             type: "arearange",
             zoomType: 'x'
         },
-        series: [<Highcharts.AreaRangeChartSeriesOptions> {
+        series: [{
             data: (((arr: number[], len: number) => {
                 for (let i = 0; i < len; i = i + 1) {
                     arr.push(i);
@@ -1191,7 +1191,7 @@ function test_AreaRange() {
             legend: {
                 enabled: false
             },
-            series: [<Highcharts.AreaRangeChartSeriesOptions> {
+            series: [{
                 name: 'Temperatures',
                 data,
                 dataLabels: {
@@ -1199,7 +1199,7 @@ function test_AreaRange() {
                     yHigh: 20,
                     yLow: -20
                 }
-            }]
+            } as Highcharts.AreaRangeChartSeriesOptions]
         });
     });
 }
@@ -1215,7 +1215,7 @@ function test_Bar() {
             categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
         },
         plotOptions: {
-            series: <Highcharts.BarChartSeriesOptions> {
+            series: {
                 borderColor: '#303030',
                 borderRadius: 5,
                 borderWidth: 2,
@@ -1240,7 +1240,7 @@ function test_Bar() {
                         }
                     }
                 }
-            }
+            } as Highcharts.BarChartSeriesOptions
         },
         series: [{
             data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
@@ -1274,7 +1274,7 @@ function test_Bar() {
 
     // grouping example
     Highcharts.getOptions().colors = Highcharts.map(Highcharts.getOptions().colors, (color: string) => {
-        return (<Highcharts.Gradient> Highcharts.Color(color))
+        return (Highcharts.Color(color) as Highcharts.Gradient)
             .setOpacity(0.5)
             .get('rgba');
     });
@@ -1309,19 +1309,19 @@ function test_Bar() {
                 shadow: false
             }
         },
-        series: [<Highcharts.BarChartSeriesOptions> {
+        series: [{
             name: 'Tokyo',
             data: [49.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4],
             pointPadding: 0
-        }, <Highcharts.BarChartSeriesOptions> {
+        } as Highcharts.BarChartSeriesOptions, {
             name: 'New York',
             data: [83.6, 78.8, 98.5, 93.4, 106.0, 84.5, 105.0, 104.3, 91.2, 83.5, 106.6, 92.3],
             pointPadding: 0.1
-        }, <Highcharts.BarChartSeriesOptions> {
+        }, {
             name: 'London',
             data: [48.9, 38.8, 39.3, 41.4, 47.0, 48.3, 59.0, 59.6, 52.4, 65.2, 59.3, 51.2],
             pointPadding: 0.2
-        }, <Highcharts.BarChartSeriesOptions> {
+        }, {
             name: 'Berlin',
             data: [42.4, 33.2, 34.5, 39.7, 52.6, 75.5, 57.4, 60.4, 47.6, 39.1, 46.8, 51.1],
             pointPadding: 0.3
@@ -1407,7 +1407,7 @@ function test_Bubble() {
                 maxSize: 50
             }
         },
-        series: [<Highcharts.BubbleChartSeriesOptions> {
+        series: [{
             data: [
                 [9, 81, 13],
                 [98, 5, 39],
@@ -1430,7 +1430,7 @@ function test_Bubble() {
             zMin: 0,
             zMax: 100,
             zThreshold: 0
-        }]
+        } as Highcharts.BubbleChartSeriesOptions]
     });
 
     // size by absolute value example
@@ -1444,7 +1444,7 @@ function test_Bubble() {
         subtitle: {
             text: 'Size is computed by absolute value on negative bubbles'
         },
-        series: [<Highcharts.BubbleChartSeriesOptions> {
+        series: [{
             data: [
                 [-5, 0, -5],
                 [-4, 0, -4],
@@ -1460,7 +1460,7 @@ function test_Bubble() {
             ],
             sizeByAbsoluteValues: true,
             negativeColor: '#FF0000'
-        }]
+        } as Highcharts.BubbleChartSeriesOptions]
     });
 }
 
@@ -1479,7 +1479,7 @@ function test_ColumnCrispFalse() {
         }
         return arr;
     };
-    const chart = new Highcharts.Chart(<Highcharts.Options> {
+    const chart = new Highcharts.Chart({
         title: {
             text: 'Crisp columns are disabled'
         },
@@ -1527,7 +1527,7 @@ function test_ErrorBar() {
         tooltip: {
             shared: true
         },
-        series: [<Highcharts.SplineChartSeriesOptions> {
+        series: [{
             name: 'Temperature',
             type: 'spline',
             data: [7.0, 6.9, 9.5, 14.5, 18.2, 21.5, 25.2, 26.5, 23.3, 18.3, 13.9, 9.6],
@@ -1537,7 +1537,7 @@ function test_ErrorBar() {
             tooltip: {
                 pointFormat: '<span style="font-weight: bold; color: {series.color}"> {series.name}</span> : <b> {point.y:.1f}°C</b> <br/> '
             }
-        }, <Highcharts.ErrorBarChartSeriesOptions> {
+        } as Highcharts.SplineChartSeriesOptions, {
             color: '#FF0000',
             name: 'Temperature error',
             type: 'errorbar',
@@ -1549,7 +1549,7 @@ function test_ErrorBar() {
             stemDashStyle: "Solid",
             stemWidth: 3,
             whiskerLength: 0
-        }]
+        } as Highcharts.ErrorBarChartSeriesOptions]
     });
 }
 
@@ -1568,7 +1568,7 @@ function test_FindNearestPointBy() {
             }
         },
 
-        series: [<Highcharts.IndividualSeriesOptions> {
+        series: [{
             findNearestPointBy: 'x',
             // Hover at [3.5, 6] to demo x-dimension search
             // Compare to Series 2 behavior at [5.5, 3]
@@ -1584,7 +1584,7 @@ function test_FindNearestPointBy() {
                 [6, 6],
                 [7, 6]
             ]
-        }, <Highcharts.IndividualSeriesOptions> {
+        } as Highcharts.IndividualSeriesOptions, {
             findNearestPointBy: 'xy',
             // Hover at [1, 4] to demo xy-dimension search.
             // Useful when having multiple points on the same x-value.
@@ -1600,7 +1600,7 @@ function test_FindNearestPointBy() {
                 [6, 3],
                 [7, 3]
             ]
-        }]
+        } as Highcharts.IndividualSeriesOptions]
     });
 }
 
@@ -1618,7 +1618,7 @@ function test_Funnel() {
             x: -50
         },
         plotOptions: {
-            series: <Highcharts.FunnelChartSeriesOptions> {
+            series: {
                 dataLabels: {
                     enabled: true,
                     format: '<b> {point.name}</b>  ({point.y:,.0f})',
@@ -1630,7 +1630,7 @@ function test_Funnel() {
                 reversed: false,
                 height: "10%",
                 width: 100
-            }
+            } as Highcharts.FunnelChartSeriesOptions
         },
         legend: {
             enabled: false
@@ -1701,10 +1701,10 @@ function test_Gauge() {
                 }
             }
         },
-        series: [<Highcharts.GaugeChartSeriesOptions> {
+        series: [{
             data: [80],
             overshoot: 5
-        }]
+        } as Highcharts.GaugeChartSeriesOptions]
     });
 }
 
@@ -1757,14 +1757,14 @@ function test_HeatMap() {
             ],
             min: -5
         },
-        series: [<Highcharts.HeatMapSeriesOptions> {
+        series: [{
             borderWidth: 0,
             colsize: 24 * 36e5, // one day
             tooltip: {
                 headerFormat: 'Temperature<br/> ',
                 pointFormat: '{point.x:%e %b, %Y} {point.y}:00: <b> {point.value} ℃</b> '
             }
-        }]
+        } as Highcharts.HeatMapSeriesOptions]
     });
 }
 
@@ -1779,17 +1779,17 @@ function test_Line() {
         xAxis: {
             categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
         },
-        series: [<Highcharts.LineChartSeriesOptions> {
+        series: [{
             data: [1, 2, 3, 4, null, 6, 7, null, 9],
             step: 'right',
             name: 'Right',
             linecap: 'round'
-        }, <Highcharts.LineChartSeriesOptions> {
+        } as Highcharts.LineChartSeriesOptions, {
             data: [5, 6, 7, 8, null, 10, 11, null, 13],
             step: 'center',
             name: 'Center',
             linecap: 'round'
-        }, <Highcharts.LineChartSeriesOptions> {
+        }, {
             data: [9, 10, 11, 12, null, 14, 15, null, 17],
             step: 'left',
             name: 'Left',
@@ -1829,7 +1829,7 @@ function test_Pie() {
                 }
             }
         },
-        series: [<Highcharts.PieChartSeriesOptions> {
+        series: [{
             name: "Brands",
             colorByPoint: true,
             data: [{
@@ -1853,7 +1853,7 @@ function test_Pie() {
                 name: "Proprietary or Undetectable",
                 y: 0.2
             }]
-        }]
+        } as Highcharts.PieChartSeriesOptions]
     });
 
     // semi circle
@@ -1888,7 +1888,7 @@ function test_Pie() {
                 center: ['50%', '75%']
             }
         },
-        series: [<Highcharts.PieChartSeriesOptions> {
+        series: [{
             type: 'pie',
             name: 'Browser share',
             innerSize: '50%',
@@ -2161,10 +2161,10 @@ function test_Waterfall() {
 }
 
 function test_AccessibilityOptions() {
-    const accessibilityOptions: Highcharts.AccessibilityOptions = <Highcharts.AccessibilityOptions> {
+    const accessibilityOptions: Highcharts.AccessibilityOptions = {
         describeSingleSeries: true,
         enabled: true,
-        keyboardNavigation: <Highcharts.KeyboardNavigationOptions> {
+        keyboardNavigation: {
             enabled: true,
             skipNullPoints: true
         },
@@ -2177,7 +2177,7 @@ function test_AccessibilityOptions() {
         seriesDescriptionFormatter: () => { }
     };
 
-    const chart = new Highcharts.Chart(<Highcharts.Options> {
+    const chart = new Highcharts.Chart({
         accessibility: accessibilityOptions
     });
 }
@@ -2435,31 +2435,31 @@ function test_AxisObject() {
     axis.toPixels(10, true);
     axis.toValue(10);
     axis.toValue(10, true);
-    axis.update(<Highcharts.AxisOptions> {});
-    axis.update(<Highcharts.AxisOptions> {}, true);
+    axis.update({});
+    axis.update({}, true);
 }
 
 function test_ChartObject() {
     const chart = $("#container").highcharts();
-    chart.addAxis(<Highcharts.AxisOptions> {});
-    chart.addAxis(<Highcharts.AxisOptions> {}, true);
-    chart.addAxis(<Highcharts.AxisOptions> {}, true, false);
-    chart.addAxis(<Highcharts.AxisOptions> {}, true, true, false);
-    chart.addAxis(<Highcharts.AxisOptions> {}, true, true, { duration: 50 });
-    chart.addSeries(<Highcharts.IndividualSeriesOptions> {});
-    chart.addSeries(<Highcharts.IndividualSeriesOptions> {}, false);
-    chart.addSeries(<Highcharts.IndividualSeriesOptions> {}, false, false);
-    chart.addSeries(<Highcharts.IndividualSeriesOptions> {}, false, { duration: 50 });
-    chart.addSeriesAsDrilldown(<Highcharts.PointObject> {}, <Highcharts.IndividualSeriesOptions> {});
+    chart.addAxis({});
+    chart.addAxis({}, true);
+    chart.addAxis({}, true, false);
+    chart.addAxis({}, true, true, false);
+    chart.addAxis({}, true, true, { duration: 50 });
+    chart.addSeries({});
+    chart.addSeries({}, false);
+    chart.addSeries({}, false, false);
+    chart.addSeries({}, false, { duration: 50 });
+    chart.addSeriesAsDrilldown({}, {});
     const container = chart.container;
     console.log(container.id);
     chart.destroy();
     chart.drillUp();
-    chart.exportChart(<Highcharts.ExportingOptions> {}, <Highcharts.Options> {});
-    chart.exportChartLocal(<Highcharts.ExportingOptions> {}, <Highcharts.Options> {});
+    chart.exportChart({}, {});
+    chart.exportChartLocal({}, {});
     const object = chart.get('axisIdOrSeriesIdOrPointId');
     const svg1 = chart.getSVG();
-    const svg2 = chart.getSVG(<Highcharts.Options> {});
+    const svg2 = chart.getSVG({});
     const selectedPoints = chart.getSelectedPoints();
     const selectedSeries = chart.getSelectedSeries();
     chart.hideLoading();
@@ -2480,11 +2480,11 @@ function test_ChartObject() {
     const firstXAxis = chart.xAxis[0];
     const firstYAxis = chart.yAxis[0];
     const legend = chart.legend;
-    chart.update(<Highcharts.Options> {});
-    chart.update(<Highcharts.Options> {}, true);
-    chart.update(<Highcharts.Options> {}, true, true);
-    chart.update(<Highcharts.Options> {}, true, true, true);
-    chart.update(<Highcharts.Options> {}, true, true, {
+    chart.update({});
+    chart.update({}, true);
+    chart.update({}, true, true);
+    chart.update({}, true, true, true);
+    chart.update({}, true, true, {
         duration: 3000,
     });
 }
@@ -2564,7 +2564,7 @@ function test_NumericSymbolMagnitude() {
 }
 
 function test_PaneBackground() {
-    const pane = <Highcharts.PaneBackground> {
+    const pane = {
         backgroundColor: 'blue',
         borderColor: 'white',
         borderWidth: 5,
@@ -2576,7 +2576,7 @@ function test_PaneBackground() {
 }
 
 function test_PointObject() {
-    const point = <Highcharts.PointObject> $('#container').highcharts().get('point1');
+    const point = $('#container').highcharts().get('point1') as Highcharts.PointObject;
     const category = point.category;
     const percentage = point.percentage;
     point.index;
@@ -2608,7 +2608,7 @@ function test_RendererObject() {
     const renderer = $('#container').highcharts().renderer;
     renderer.arc(0, 0, 20, 10, 0, Math.PI);
     renderer.circle(0, 0, 100);
-    renderer.definition(<object> {});
+    renderer.definition({});
     renderer.g('groupName');
     renderer.image('http://source', 20, 20, 100, 100);
     renderer.label('Label', 200, 100, 'rect', 0, 0, false, false, 'class');
@@ -2618,15 +2618,15 @@ function test_RendererObject() {
 }
 
 function test_ResponsiveOptions() {
-    const responsiveOptions: Highcharts.ResponsiveOptions = <Highcharts.ResponsiveOptions> {
+    const responsiveOptions: Highcharts.ResponsiveOptions = {
         rules: [
-            <Highcharts.RulesOptions> {
-                chartOptions: <Highcharts.Options> {
+            {
+                chartOptions: {
                     chart: {
                         description: 'just a test'
                     }
                 },
-                condition: <Highcharts.ConditionOptions> {
+                condition: {
                     callback: () => { },
                     maxHeight: 420,
                     maxWidth: 420,
@@ -2643,7 +2643,7 @@ function test_ResponsiveOptions() {
 }
 
 function test_SeriesObject() {
-    const series = <Highcharts.SeriesObject> $('#container').highcharts().get('series1');
+    const series = $('#container').highcharts().get('series1') as Highcharts.SeriesObject;
     series.addPoint(0);
     series.addPoint([0, 0]);
     series.addPoint({});