What causes the error message saying 'undefined' cannot be assigned to the specified type ...?

I just finished developing an innovative Angular application.

Within the app.component.html file, I have included:

<bryntum-scheduler
    #scheduler
    [resources] = "resources"
    [events] = "events"
    [columns] = "schedulerConfig.columns"
    [startDate] = "schedulerConfig.startDate!"
    [endDate] = "schedulerConfig.endDate!"
></bryntum-scheduler>

The structure of app.component.ts is as follows:

import { Component, ViewChild } from '@angular/core';
import { BryntumSchedulerComponent } from '@bryntum/scheduler-angular';
import { schedulerConfig } from './app.config';

@Component({
    selector    : 'app-root',
    templateUrl : './app.component.html',
    styleUrls   : ['./app.component.scss']
})
export class AppComponent {
    resources = [
        { id : 1, name : 'Dan Stevenson' },
        { id : 2, name : 'Talisha Babin' }
    ];

    events = [
        { resourceId : 1, startDate : '2022-01-01', endDate : '2022-01-10' },
        { resourceId : 2, startDate : '2022-01-02', endDate : '2022-01-09' }
    ];

    schedulerConfig = schedulerConfig;

    @ViewChild('scheduler') schedulerComponent!: BryntumSchedulerComponent;
}

In addition, app.config.ts (located in the same folder as app.component.ts) contains:

import { SchedulerConfig } from '@bryntum/scheduler';

export const schedulerConfig: Partial<SchedulerConfig> = {
    columns : [
        { text : 'Name', field : 'name', width : 160 }
    ],
    startDate : new Date(2022, 10, 17),
    endDate   : new Date(2022, 10, 23)
};

However, upon attempting to compile my application, I encountered the following error:

Type 'undefined' is not assignable to type 'object | object[] | ColumnStore | Partial | Partial[]'.

5 [columns] = "schedulerConfig.columns"

I am struggling to identify the root cause of this issue. Can anyone provide some guidance?

Answer №1

As per the official documentation, there are numerous properties within the ColumnStore object, some of which you have already defined (such as text, field, width). Hence, it is recommended to "soft" cast the columns to a ColumnStore when passing them to this component in the following manner:

<bryntum-scheduler
    #scheduler
    [resources] = "resources"
    [events] = "events"
    [columns] = "schedulerConfig.columns as ColumnStore" <!--here-->
    [startDate] = "schedulerConfig.startDate!"
    [endDate] = "schedulerConfig.endDate!"
></bryntum-scheduler>

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