diff --git a/cypress/e2e/bar-chart.cy.ts b/cypress/e2e/bar-chart.cy.ts
index 9b2da2a6b..5b94118e7 100644
--- a/cypress/e2e/bar-chart.cy.ts
+++ b/cypress/e2e/bar-chart.cy.ts
@@ -87,7 +87,7 @@ context("Bar Chart", () => {
         legend().find(".legend-header").should("have.text", "Channel");
       });
 
-      function assertLegendRowsInOrder(...values) {
+      function assertLegendRowsInOrder(...values: string[]) {
         values.forEach((label, idx) => {
           legendValue(idx + 1).should("contain", label);
         });
diff --git a/cypress/e2e/boolean-filter-menu.cy.ts b/cypress/e2e/boolean-filter-menu.cy.ts
index a9b801260..420542238 100644
--- a/cypress/e2e/boolean-filter-menu.cy.ts
+++ b/cypress/e2e/boolean-filter-menu.cy.ts
@@ -33,8 +33,8 @@ context("Boolean Filter Menu", () => {
     // tslint:enable:max-line-length
   };
 
-  function assertSelection(isTrueOptionSelected, isFalseOptionSelected) {
-    function selectionToPredicate(isSelected) {
+  function assertSelection(isTrueOptionSelected: boolean, isFalseOptionSelected: boolean) {
+    function selectionToPredicate(isSelected: boolean) {
       return isSelected ? "have.class" : "not.have.class";
     }
 
diff --git a/cypress/e2e/csv-data-source.cy.ts b/cypress/e2e/csv-data-source.cy.ts
index 2815bef22..7edeff425 100644
--- a/cypress/e2e/csv-data-source.cy.ts
+++ b/cypress/e2e/csv-data-source.cy.ts
@@ -21,13 +21,13 @@ context("CSV Data Source", () => {
   const splitValue = (idx: number) => leftGutter().get(`.split-value:nth-child(${idx})`);
   const measureValue = (idx: number) => body().get(`.measure-row:nth-child(${idx}) .measure-label`);
 
-  function assertDates(...dates) {
+  function assertDates(...dates: string[]) {
     dates.forEach((date, idx) => {
       splitValue(idx + 1).should("contain", date);
     });
   }
 
-  function assertValues(...values) {
+  function assertValues(...values: string[]) {
     values.forEach((value, idx) => {
       measureValue(idx + 1).should("contain", value);
     });
diff --git a/cypress/e2e/fixed-time-filter-menu.cy.ts b/cypress/e2e/fixed-time-filter-menu.cy.ts
index 232ddc9b9..2d5b57c5b 100644
--- a/cypress/e2e/fixed-time-filter-menu.cy.ts
+++ b/cypress/e2e/fixed-time-filter-menu.cy.ts
@@ -39,14 +39,14 @@ context("Fixed Time Filter Menu", () => {
     fixedTimeFilter: "http://localhost:9090/#wiki/4/N4IgbglgzgrghgGwgLzgFwgewHYgFwhqZqJQgA0hEAtgKbI634gCiaAxgPQCqAKgMIUQAMwgI0tAE5k8AbVBoAngAcmBDHSGTaw5hqaV9AJTjYA5rRnyQUEpLTMATAAYAjAFYAtM4Ccn1468zs54bqHOAHTBzgBaQrTYACZObl6+/gDMQSFhwVHBcQC+ALollFDKSGhWxeVSEJb41trCUgnsaiBwiYm0yZTCmJLU6PgKKp29wnAw4kJgiDCdIIWGE8x0cLDaK7UgyhDY2H0AIjQJUFjYViDsABamxwhC2HB0FXAdQtBGmABGxBAewORz6AGUhg4CN1ev0QAhaBYkvhsLMEJQ7hAzHckNioaiEAhCkA=="
   };
 
-  function assertInputValues(startDate, startTime, endDate, endTime) {
+  function assertInputValues(startDate: string, startTime: string, endDate: string, endTime: string) {
     startDateInput().should("have.value", startDate);
     startTimeInput().should("have.value", startTime);
     endDateInput().should("have.value", endDate);
     endTimeInput().should("have.value", endTime);
   }
 
-  function assertCalendarValues(date, startDay, endDay) {
+  function assertCalendarValues(date: string, startDay: number, endDay: number) {
     calendarHeader().should("contain", date);
     calendarDay(startDay).should("have.class", "selected");
     calendarDay(endDay).should("have.class", "selected");
diff --git a/cypress/e2e/legend.cy.ts b/cypress/e2e/legend.cy.ts
index 43829d854..567475bee 100644
--- a/cypress/e2e/legend.cy.ts
+++ b/cypress/e2e/legend.cy.ts
@@ -30,7 +30,7 @@ context("Line Chart Legend", () => {
     // tslint:enable:max-line-length
   };
 
-  function assertLegendRowsInOrder(...values) {
+  function assertLegendRowsInOrder(...values: string[]) {
     const rows = legendValues();
     rows.should("have.length", values.length);
 
diff --git a/cypress/e2e/line-chart.cy.ts b/cypress/e2e/line-chart.cy.ts
index e6028b226..3d16f5d10 100644
--- a/cypress/e2e/line-chart.cy.ts
+++ b/cypress/e2e/line-chart.cy.ts
@@ -215,7 +215,7 @@ context("Line Chart", () => {
   });
 
   describe("Highlight", () => {
-    const assertHighlighterPosition = (expectedLeft, expectedWidth) =>
+    const assertHighlighterPosition = (expectedLeft: number, expectedWidth: number) =>
       highlighterFrame().should($frame => {
         const frame = $frame.get(0);
         expect(frame.offsetLeft).to.eq(expectedLeft);
diff --git a/cypress/e2e/split-tile.cy.ts b/cypress/e2e/split-tile.cy.ts
index 8ebfe6428..e8329ddc6 100644
--- a/cypress/e2e/split-tile.cy.ts
+++ b/cypress/e2e/split-tile.cy.ts
@@ -39,7 +39,7 @@ context("Split Tile", () => {
     // tslint:enable:max-line-length
   };
 
-  const shouldHaveSplits = (...splits) => {
+  const shouldHaveSplits = (...splits: string[]) => {
     splitItems().should("have.length", splits.length);
     splitItemsRow().within(() => {
       splits.forEach((split, idx) => {
diff --git a/cypress/e2e/string-split-menu.cy.ts b/cypress/e2e/string-split-menu.cy.ts
index 327749f55..dd89c82fa 100644
--- a/cypress/e2e/string-split-menu.cy.ts
+++ b/cypress/e2e/string-split-menu.cy.ts
@@ -31,7 +31,7 @@ context("String Split Menu", () => {
     channelSplit: "http://localhost:9090/#wiki/4/N4IgbglgzgrghgGwgLzgFwgewHYgFwhpwBGCApiADSEQC2ZyOFBAomgMYD0AqgCoDCVEADMICNGQBOUfAG1QaAJ4AHZjXpDJZYfnUVqGegAUpWACYy88kGZiT0WXASMBGACJCoE5fgC0LgxU1BHQyLxAAXwBdaOooZSQ0S2slVV0vSQhsAHMhMzoybChHXXYACzhsbDIET0xJNHxQLR0CODMzMjMhVLUoUzC8iC12DBxdTqh2QvycoVVMzG6CSOokWghGvABWAAZYkH7Mwatm7SlC6d12zu7qYXradCbCIIntOBhxITBEGDVVq80gR6HBYFpIlFqMostUzG4CkVHMkQOVKtVatRsHB6PE4FdqNAAEqYYiYRpQkAwqpdADK9S2IBuXSE5GyM3w2C+CGoZQg2TKSAFWy5CAQESAA=="
   };
 
-  function assertSplitSettings(orderBy, descending, limit) {
+  function assertSplitSettings(orderBy: string, descending: boolean, limit: number) {
     sortBySelection().should("contain", orderBy);
     sortDirection().should("have.class", descending ? "descending" : "ascending");
     limitSelection().should("contain", limit);
diff --git a/cypress/e2e/table.cy.ts b/cypress/e2e/table.cy.ts
index c70dbbd2a..629c6a47b 100644
--- a/cypress/e2e/table.cy.ts
+++ b/cypress/e2e/table.cy.ts
@@ -23,8 +23,8 @@ context("Table", () => {
   const highlightModal = () => cy.get(".highlight-modal");
   const acceptHighlight = () => highlightModal().find(".accept");
   const dropHighlight = () => highlightModal().find(".drop");
-  const findSplitValue = label => table().find(`.split-value:contains("${label}")`);
-  const nthRow = n => table().find(`.measure-row:nth-child(${n})`);
+  const findSplitValue = (label: string) => table().find(`.split-value:contains("${label}")`);
+  const nthRow = (n: number) => table().find(`.measure-row:nth-child(${n})`);
 
   describe("Highlight", () => {
     const urls = {
@@ -37,7 +37,7 @@ context("Table", () => {
       clickSplitValue("Main");
     });
 
-    function clickSplitValue(label) {
+    function clickSplitValue(label: string) {
       return findSplitValue(label)
         .then($splitValue => {
           const { top: scrollerOffset } = $splitValue.closest(".scroller").offset();
@@ -48,7 +48,7 @@ context("Table", () => {
         });
     }
 
-    function assertSplitValueRowHighlight(label) {
+    function assertSplitValueRowHighlight(label: string) {
       const splitValue = findSplitValue(label);
       splitValue
         .should("have.class", "highlight")
@@ -63,7 +63,7 @@ context("Table", () => {
       table().find(".split-value.selected").should("not.exist");
     }
 
-    function assertFilterTileValues(values) {
+    function assertFilterTileValues(values: string[]) {
       values.forEach((value, idx) => {
         filterTile(idx + 1).should("contain", value);
       });