我创建了一个const类ElementConst
export class ElementConst {
public static LINK = 'LINK';
public static HEADING_1 = 'heading-1';
public static HEADING_2 = 'heading-2';
public static HEADING_3 = 'heading-3';
public static HEADING_4 = 'heading-4';
public static HEADING_5 = 'heading-5';
public static HEADING_6 = 'heading-6';
public static PARAGRAPH = 'paragraph';
public static STRONG = 'BOLD';
}
所以我在我的模块中导入了这个类,并尝试将其分配给useValue
export const CONTENT_MAPPINGS_PROVIDER: Provider = [
{
provide: CONTENT_MAPPINGS,
useValue: {
ElementConst.HEADING_1: HeadingComponent, // trying to do something like this, which throws error
'heading-2': HeadingComponent,
'heading-3': HeadingComponent,
'heading-4': HeadingComponent,
'heading-5': HeadingComponent,
'heading-6': HeadingComponent,
'paragraph':ParagraphComponent
}
}
];
为什么我无法在useValue
中分配值?
指定动态键时,需要将其包装在[]
中。
以下是如何使代码通过编译器的简单示例:
export class ElementConst {
public static LINK = 'LINK';
public static HEADING_1 = 'heading-1';
public static HEADING_2 = 'heading-2';
public static HEADING_3 = 'heading-3';
public static HEADING_4 = 'heading-4';
public static HEADING_5 = 'heading-5';
public static HEADING_6 = 'heading-6';
public static PARAGRAPH = 'paragraph';
public static STRONG = 'BOLD';
}
interface Provider {
provide: any;
useValue: any;
}
const HeadingComponent = {};
const ParagraphComponent = {};
export const CONTENT_MAPPINGS_PROVIDER: Provider[] = [
{
provide: '',
useValue: {
[ElementConst.HEADING_1]: HeadingComponent,
'heading-2': HeadingComponent,
'heading-3': HeadingComponent,
'heading-4': HeadingComponent,
'heading-5': HeadingComponent,
'heading-6': HeadingComponent,
'paragraph': ParagraphComponent,
}
}
];