Upgrading NPM to 5.6.0 breaks TypeScript Compiling

Upgrading my project from BJS 4.2 to 5.6.0 using NPM causes errors when compiling TypeScript. Please advise.
Michael

/./../web/node_modules/babylonjs/babylon.module.d.ts:24516:67 - error TS2304: Cannot find name 'BigUint64Array'.

24516     readValues(firstQuery?: number, queryCount?: number): Promise<BigUint64Array | null>;
                                                                        ~~~~~~~~~~~~~~

../../web/node_modules/babylonjs/babylon.module.d.ts:74451:28 - error TS2304: Cannot find name 'XMLHttpRequestBodyInit'.

74451     send(body?: Document | XMLHttpRequestBodyInit | null): void;
                                 ~~~~~~~~~~~~~~~~~~~~~~

../../web/node_modules/babylonjs/babylon.module.d.ts:123960:71 - error TS2304: Cannot find name 'BigUint64Array'.

123960         readValues(firstQuery?: number, queryCount?: number): Promise<BigUint64Array | null>;
                                                                             ~~~~~~~~~~~~~~

../../web/node_modules/babylonjs/babylon.module.d.ts:170936:32 - error TS2304: Cannot find name 'XMLHttpRequestBodyInit'.

170936         send(body?: Document | XMLHttpRequestBodyInit | null): void;
                                      ~~~~~~~~~~~~~~~~~~~~~~

../../web/node_modules/babylonjs/babylon.module.d.ts:196883:13 - error TS2403: Subsequent variable declarations must have the same type.  Variable 'VRFrameData' must be of type '{ new (): VRFrameData; prototype: VRFrameData; }', but here has type 'any'.

196883 declare var VRFrameData: any;
                   ~~~~~~~~~~~```

What typescript version are you using?