Use new eslint-plugin-functional instead of tslint-immutable

src/file/table/grid.ts

@@ -13,7 +13,7 @@ import { XmlAttributeComponent, XmlComponent } from "@file/xml-components";
 import { twipsMeasureValue } from "@util/values";
 
 export class TableGrid extends XmlComponent {
-    public constructor(widths: number[] | string[]) {
+    public constructor(widths: readonly number[] | readonly string[]) {
         super("w:tblGrid");
         for (const width of widths) {
             this.root.push(new GridCol(width));

src/file/table/table-cell/table-cell.ts

@@ -6,7 +6,7 @@ import { Table } from "../table";
 import { ITableCellPropertiesOptions, TableCellProperties } from "./table-cell-properties";
 
 export interface ITableCellOptions extends ITableCellPropertiesOptions {
-    readonly children: (Paragraph | Table)[];
+    readonly children: readonly (Paragraph | Table)[];
 }
 
 export class TableCell extends XmlComponent {

src/file/table/table-row/table-row.ts

@@ -3,7 +3,7 @@ import { TableCell } from "../table-cell";
 import { ITableRowPropertiesOptions, TableRowProperties } from "./table-row-properties";
 
 export interface ITableRowOptions extends ITableRowPropertiesOptions {
-    readonly children: TableCell[];
+    readonly children: readonly TableCell[];
 }
 
 export class TableRow extends XmlComponent {
@@ -20,7 +20,7 @@ export class TableRow extends XmlComponent {
         return this.options.children.length;
     }
 
-    public get cells(): TableCell[] {
+    public get cells(): readonly TableCell[] {
         return this.root.filter((xmlComponent) => xmlComponent instanceof TableCell);
     }
 

src/file/table/table.ts

@@ -21,9 +21,9 @@ import { ITableWidthProperties } from "./table-width";
     algorithm will expand columns to fit its content
  */
 export interface ITableOptions {
-    readonly rows: TableRow[];
+    readonly rows: readonly TableRow[];
     readonly width?: ITableWidthProperties;
-    readonly columnWidths?: number[];
+    readonly columnWidths?: readonly number[];
     readonly margins?: ITableCellMarginOptions;
     readonly indent?: ITableWidthProperties;
     readonly float?: ITableFloatOptions;
@@ -38,6 +38,7 @@ export class Table extends XmlComponent {
     public constructor({
         rows,
         width,
+        // eslint-disable-next-line functional/immutable-data
         columnWidths = Array<number>(Math.max(...rows.map((row) => row.CellCount))).fill(100),
         margins,
         indent,