diff --git a/types/easy-table/easy-table-tests.ts b/types/easy-table/easy-table-tests.ts
index 8eba36ce6e..f5ee9efecd 100644
--- a/types/easy-table/easy-table-tests.ts
+++ b/types/easy-table/easy-table-tests.ts
@@ -83,11 +83,13 @@ function totalling() {
 
 function other_samples() {
 	var t = new Table();
+	var columns = Object.freeze(t.columns());
 
 	data.forEach(product => {
 		t.cell('Product Id', product.id)
 		t.cell('Description', product.desc)
 		t.cell('Price, USD', product.price, Table.number(2))
+		t.pushDelimeter(columns)
 		t.newRow()
 	})
 
diff --git a/types/easy-table/index.d.ts b/types/easy-table/index.d.ts
index f75d74861b..0ee1863c4e 100644
--- a/types/easy-table/index.d.ts
+++ b/types/easy-table/index.d.ts
@@ -53,7 +53,7 @@ declare class EasyTable {
      *
      * @returns {Table} `this`
      */
-    public newRow(): EasyTable;
+    public newRow(): this;
 
     /**
      * Write cell in the current row
@@ -63,7 +63,7 @@ declare class EasyTable {
      * @param {Function} [printer]  - Printer function to format the value
      * @returns {Table} `this`
      */
-    public cell<T>(col: string, val: T, printer?: CellPrinter<T>): EasyTable;
+    public cell<T>(col: string, val: T, printer?: CellPrinter<T>): this;
 
     /**
      * Get list of columns in printing order
@@ -92,7 +92,7 @@ declare class EasyTable {
      * @param {String[]} [cols]
      * @returns {Table} `this`
      */
-    public pushDelimeter(cols?: string[]): EasyTable;
+    public pushDelimeter(cols?: ReadonlyArray<string>): this;
 
     /**
      * Compute all totals and yield the results to `cb`
@@ -115,14 +115,14 @@ declare class EasyTable {
      * @param {Function|string[]} [cmp] - Either compare function or a list of columns to sort on
      * @returns {Table} `this`
      */
-    public sort(cmp?: string[]): EasyTable;
+    public sort(cmp?: ReadonlyArray<string>): this;
     /**
      * Sort the table
      *
      * @param {Function|string[]} [cmp] - Either compare function or a list of columns to sort on
      * @returns {Table} `this`
      */
-    public sort<T>(cmp?: CompareFunction<T>): EasyTable;
+    public sort<T>(cmp?: CompareFunction<T>): this;
 
     /**
      * Add a total for the column
@@ -131,7 +131,7 @@ declare class EasyTable {
      * @param {Object} [opts]
      * @returns {Table} `this`
      */
-    public total<T>(col: string, opts?: TotalOptions<T>): EasyTable;
+    public total<T>(col: string, opts?: TotalOptions<T>): this;
     /**
      * Predefined helpers for totals
      */