refactor(column): use interfaces rather than instances

Similar to what we did with View, Node, File, and Folder.
As we cannot validate class instances anyways we can just use
interfaces, allowing more flexible code.

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

Author: susnux

lib/navigation/column.ts

@@ -8,7 +8,7 @@ import type { IView } from './view.ts'
 
 import { checkOptionalProperty } from '../utils/objectValidation.ts'
 
-interface ColumnData {
+export interface IColumn {
 	/** Unique column ID */
 	id: string
 	/** Translated column title */
@@ -24,11 +24,11 @@ interface ColumnData {
 	summary?: (node: INode[], view: IView) => string
 }
 
-export class Column implements ColumnData {
+export class Column implements IColumn {
 
-	private _column: ColumnData
+	private _column: IColumn
 
-	constructor(column: ColumnData) {
+	constructor(column: IColumn) {
 		validateColumn(column)
 		this._column = column
 	}
@@ -61,7 +61,7 @@ export class Column implements ColumnData {
  * @param column - the column to check
  * @throws {Error} if the column is not valid
  */
-export function validateColumn(column: ColumnData): void {
+export function validateColumn(column: IColumn): void {
 	if (typeof column !== 'object' || column === null) {
 		throw new Error('View column must be an object')
 	}

lib/navigation/view.ts

@@ -4,9 +4,10 @@
  */
 
 import type { IFolder, INode } from '../node/index.ts'
+import type { IColumn } from './column.ts'
 
 import isSvg from 'is-svg'
-import { Column, validateColumn } from './column.ts'
+import { validateColumn } from './column.ts'
 import { checkOptionalProperty } from '../utils/objectValidation.ts'
 
 export type ContentsWithRoot = {
@@ -82,7 +83,7 @@ export interface IView {
 	 * This view column(s). Name and actions are
 	 * by default always included
 	 */
-	columns?: Column[]
+	columns?: IColumn[]
 
 	/** The parent unique ID */
 	parent?: string