How to use the @aws-cdk/aws-iam.ArnPrincipal function in @aws-cdk/aws-iam

public static fromOriginAccessIdentityName(
    scope: cdk.Construct,
    id: string,
    originAccessIdentityName: string): IOriginAccessIdentity {

    class Import extends OriginAccessIdentityBase {
      public readonly originAccessIdentityName = originAccessIdentityName;
      public readonly grantPrincipal = new iam.ArnPrincipal(this.arn());
      constructor(s: cdk.Construct, i: string) {
        super(s, i, { physicalName: originAccessIdentityName });
      }
    }

    return new Import(scope, id);
  }