try to avoid masa being undefined

src/helpers/masa-linkable.ts

@@ -9,6 +9,6 @@ export class MasaLinkable<LinkContract extends Contract> extends MasaBase {
   public constructor(masa: Masa, public readonly contract: LinkContract) {
     super(masa);
 
-    this.links = new MasaSoulLinker(this.masa, contract);
+    this.links = new MasaSoulLinker(masa, contract);
   }
 }

src/sbt/ASBT/asbt.ts

@@ -13,9 +13,7 @@ export class ASBTWrapper<
    *
    * @param receiver
    */
-  mint = async (receiver: string) => {
-    return await mintASBT(this.masa, this.contract, receiver);
-  };
+  mint = (receiver: string) => mintASBT(this.masa, this.contract, receiver);
 }
 
 export class MasaASBT<
@@ -43,6 +41,6 @@ export class MasaASBT<
       ReferenceSBTAuthority__factory
     );
 
-    return new ASBTWrapper<Contract>(this.masa, contract);
+    return new ASBTWrapper<Contract>(super.masa, contract);
   }
 }

src/sbt/SSSBT/sssbt.ts

@@ -14,29 +14,22 @@ export class SSSBTWrapper<
    *
    * @param receiver
    */
-  sign = async (receiver: string) => {
-    return await signSSSBT(this.masa, this.contract, receiver);
-  };
+  sign = (receiver: string) => signSSSBT(this.masa, this.contract, receiver);
 
   /**
    *
    * @param authorityAddress
    * @param signatureDate
    * @param signature
    */
-  mint = async (
-    authorityAddress: string,
-    signatureDate: number,
-    signature: string
-  ) => {
-    return await mintSSSBT(
+  mint = (authorityAddress: string, signatureDate: number, signature: string) =>
+    mintSSSBT(
       this.masa,
       this.contract,
       authorityAddress,
       signatureDate,
       signature
     );
-  };
 }
 
 export class MasaSSSBT<
@@ -75,6 +68,6 @@ export class MasaSSSBT<
       ReferenceSBTSelfSovereign__factory
     );
 
-    return new SSSBTWrapper<Contract>(this.masa, contract);
+    return new SSSBTWrapper<Contract>(super.masa, contract);
   }
 }

src/sbt/sbt.ts

@@ -19,17 +19,13 @@ export class SBTWrapper<
    *
    * @param address
    */
-  list = (address?: string) => {
-    return listSBTs(this.masa, this.contract, address);
-  };
+  list = (address?: string) => listSBTs(this.masa, this.contract, address);
 
   /**
    *
    * @param SBTId
    */
-  burn = (SBTId: BigNumber) => {
-    return burnSBT(this.masa, this.contract, SBTId);
-  };
+  burn = (SBTId: BigNumber) => burnSBT(this.masa, this.contract, SBTId);
 }
 
 export class MasaSBT<