背景
angular项目中添加使用 material，cdk两个包的时候，编译不通过，报了一大堆错误。
主要是这个：An accessor cannot be declared in an ambient context.
完成错误代码
ERROR in node_modules/@angular/cdk/bidi/dir.d.ts:26:9 - error TS1086: An accessor cannot be declared in an ambient context.
26 get dir(): Direction;
~~~
node_modules/@angular/cdk/bidi/dir.d.ts:27:9 - error TS1086: An accessor cannot be declared in an ambient context.
27 set dir(value: Direction);
~~~
node_modules/@angular/cdk/bidi/dir.d.ts:29:9 - error TS1086: An accessor cannot be declared in an ambient context.
29 get value(): Direction;
~~~~~
node_modules/@angular/cdk/collections/selection-model.d.ts:24:9 - error TS1086: An accessor cannot be declared
in an ambient context.
24 get selected(): T[];
~~~~~~~~
node_modules/@angular/cdk/drag-drop/directives/drag-handle.d.ts:25:9 - error TS1086: An accessor cannot be declared in an ambient context.
25 get disabled(): boolean;
~~~~~~~~
node_modules/@angular/cdk/drag-drop/directives/drag-handle.d.ts:26:9 - error TS1086: An accessor cannot be declared in an ambient context.
26 set disabled(value: boolean);
~~~~~~~~
node_modules/@angular/cdk/drag-drop/directives/drag-preview.d.ts:25:9 - error TS1086: An accessor cannot be declared in an ambient context.
25 get matchSize(): boolean;
~~~~~~~~~
node_modules/@angular/cdk/drag-drop/directives/drag-preview.d.ts:26:9 - error TS1086: An accessor cannot be declared in an ambient context.
26 set matchSize(value: boolean);
~~~~~~~~~
node_modules/@angular/cdk/drag-drop/directives/drag.d.ts:72:9 - error TS1086: An accessor cannot be declared in an ambient context.
72 get disabled(): boolean;
~~~~~~~~
node_modules/@angular/cdk/drag-drop/directives/drag.d.ts:73:9 - error TS1086: An accessor cannot be declared in an ambient context.
73 set disabled(value: boolean);
~~~~~~~~
node_modules/@angular/cdk/drag-drop/directives/drop-list-group.d.ts:26:9 - error TS1086: An accessor cannot be
declared in an ambient context.
26 get disabled(): boolean;
~~~~~~~~
node_modules/@angular/cdk/drag-drop/directives/drop-list-group.d.ts:27:9 - error TS1086: An accessor cannot be
declared in an ambient context.
27 set disabled(value: boolean);
~~~~~~~~
node_modules/@angular/cdk/drag-drop/directives/drop-list.d.ts:69:9 - error TS1086: An accessor cannot be declared in an ambient context.
69 get disabled(): boolean;
~~~~~~~~
node_modules/@angular/cdk/drag-drop/directives/drop-list.d.ts:70:9 - error TS1086: An accessor cannot be declared in an ambient context.
70 set disabled(value: boolean);
~~~~~~~~
node_modules/@angular/cdk/drag-drop/drag-ref.d.ts:172:9 - error TS1086: An accessor cannot be declared in an ambient context.
172 get disabled(): boolean;
~~~~~~~~
node_modules/@angular/cdk/drag-drop/drag-ref.d.ts:173:9 - error TS1086: An accessor cannot be declared in an ambient context.
173 set disabled(value: boolean);
~~~~~~~~
node_modules/@angular/cdk/scrolling/fixed-size-virtual-scroll.d.ts:75:9 - error TS1086: An accessor cannot be declared in an ambient context.
75 get itemSize(): number;
~~~~~~~~
node_modules/@angular/cdk/scrolling/fixed-size-virtual-scroll.d.ts:76:9 - error TS1086: An accessor cannot be declared in an ambient context.
76 set itemSize(value: number);
~~~~~~~~
node_modules/@angular/cdk/scrolling/fixed-size-virtual-scroll.d.ts:82:9 - error TS1086: An accessor cannot be declared in an ambient context.
82 get minBufferPx(): number;
~~~~~~~~~~~
node_modules/@angular/cdk/scrolling/fixed-size-virtual-scroll.d.ts:83:9 - error TS1086: An accessor cannot be declared in an ambient context.
83 set minBufferPx(value: number);
~~~~~~~~~~~
node_modules/@angular/cdk/scrolling/fixed-size-virtual-scroll.d.ts:88:9 - error TS1086: An accessor cannot be declared in an ambient context.
88 get maxBufferPx(): number;
~~~~~~~~~~~
node_modules/@angular/cdk/scrolling/fixed-size-virtual-scroll.d.ts:89:9 - error TS1086: An accessor cannot be declared in an ambient context.
89 set maxBufferPx(value: number);
~~~~~~~~~~~
node_modules/@angular/cdk/scrolling/virtual-for-of.d.ts:53:9 - error TS1086: An accessor cannot be declared in
an ambient context.
53 get cdkVirtualForOf(): DataSource<T> | Observable<T[]> | NgIterable<T> | null | undefined;
~~~~~~~~~~~~~~~
node_modules/@angular/cdk/scrolling/virtual-for-of.d.ts:54:9 - error TS1086: An accessor cannot be declared in
an ambient context.
54 set cdkVirtualForOf(value: DataSource<T> | Observable<T[]> | NgIterable<T> | null | undefined);
~~~~~~~~~~~~~~~
node_modules/@angular/cdk/scrolling/virtual-for-of.d.ts:60:9 - error TS1086: An accessor cannot be declared in
an ambient context.
60 get cdkVirtualForTrackBy(): TrackByFunction<T> | undefined;
~~~~~~~~~~~~~~~~~~~~
node_modules/@angular/cdk/scrolling/virtual-for-of.d.ts:61:9 - error TS1086: An accessor cannot be declared in
an ambient context.
61 set cdkVirtualForTrackBy(fn: TrackByFunction<T> | undefined);
~~~~~~~~~~~~~~~~~~~~
node_modules/@angular/cdk/scrolling/virtual-for-of.d.ts:64:9 - error TS1086: An accessor cannot be declared in
an ambient context.
64 set cdkVirtualForTemplate(value: TemplateRef<CdkVirtualForOfContext<T>>);
~~~~~~~~~~~~~~~~~~~~~
node_modules/@angular/cdk/scrolling/virtual-for-of.d.ts:69:9 - error TS1086: An accessor cannot be declared in
an ambient context.
解决
原因： angular版本号 与 material cdk 版本号不匹配。
从官网可以看出有很多个版本。默认安装material，cdk的时候如果未指明版本号，会安装最新的。但是我自己的angular版本没用最新的还是8.3.8.所以才导致上面的报错。
最后只需要修改package.json中 material，cdk版本号，重新npm install 一下就能解决了。
（我的angular8.* 所以用的 material，cdk版本 8.2.3）
