Build Optimizer is not wrapping some enums

[filipesilva]

The follow enum (present in RxJS):

export enum NotificationKind {
  NEXT = 'N',
  ERROR = 'E',
  COMPLETE = 'C',
}

Is transpiled by TS 3.5 to:

export var NotificationKind;
(function (NotificationKind) {
    NotificationKind["NEXT"] = "N";
    NotificationKind["ERROR"] = "E";
    NotificationKind["COMPLETE"] = "C";
})(NotificationKind || (NotificationKind = {}));

Running it through Build Optimizer leaves it unaltered, but it should be wrapped by https://github.com/angular/angular-cli/blob/master/packages/angular_devkit/build_optimizer/src/transforms/wrap-enums.ts.

[alan-agius4]

@filipesilva, I don't think this is a regression but rather something which was never handled. wrap-enums doesn't handle string enums yet.

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