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Using typescript 2.4.1 it gives an error:
node_modules\@microsoft\sp-http\lib\httpClient\HttpClientResponse.d.ts(14,21): error TS2420: Class 'HttpClientResponse' incorrectly implements interface 'Response'.
Because of different types of field "type".
Class field:
readonly type: string;
Interface field:
readonly type: ResponseType;
If in class field type change to "ResponseType" error disappears.