I've followed the Upgrade directions to go from 10 to 11 and my App is working.  However, I am getting a pair of compiler errors:

Generating browser application bundles (phase: additional asset processing)...
Error: node_modules/@infragistics/igniteui-angular/lib/grids/common/pipes.d.ts:97:5 - error TS2416: Property 'transform' in type 'IgxDatePipeComponent' is not assignable to the same property in base type 'DatePipe'.
Type '(value: any, locale: string) => string' is not assignable to type '{ (value: string | number | Date, format?: string, timezone?: string, locale?: string): string; (value: null, format?: string, timezone?: string, locale?
: string): null; (value: string | number | Date, format?: string, timezone?: string, locale?: string): string; }'.
Type 'string' is not assignable to type 'null'.

97 transform(value: any, locale: string): string;
~~~~~~~~~
node_modules/@infragistics/igniteui-angular/lib/grids/common/pipes.d.ts:107:5 - error TS2416: Property 'transform' in type 'IgxDecimalPipeComponent' is not assignable to the same property in base type 'DecimalPipe'.
Type '(value: any, locale: string) => string' is not assignable to type '{ (value: string | number, digitsInfo?: string, locale?: string): string; (value: null, digitsInfo?: string, locale?: string): null; (value: string | num
ber, digitsInfo?: string, locale?: string): string; }'.
Type 'string' is not assignable to type 'null'.

107 transform(value: any, locale: string): string;
~~~~~~~~~

√ Browser application bundle generation complete.

Any ideas why this should be happening?  I am using the Pipe in several places, part of using the Ignite Autocomplete, but the error is only showing up for the Date and Decimal Pipes.  Is there a fix?  My 'ng update' says everything is updated.