fix: replace spread operator with array concatenation (#302)

When indexing contracts with a big number of events the array.push method will throw an error. When you use spread operator all items of the source array are stored in the stack as arguments list, so having a large number of items (~ > 100K) will cause the this stack size exceed. The most simple work-around is to manually push all items one by one.

src/providers/starknet/provider.ts

@@ -217,7 +217,7 @@ export class StarknetProvider extends BaseProvider {
     }
 
     let lastSources = this.instance.getCurrentSources(blockNumber);
-    const sourcesQueue = [...lastSources];
+    let sourcesQueue = [...lastSources];
 
     let source: ContractSourceConfig | undefined;
     while ((source = sourcesQueue.shift())) {
@@ -299,15 +299,15 @@ export class StarknetProvider extends BaseProvider {
         nextSource => !lastSources.find(lastSource => lastSource.contract === nextSource.contract)
       );
 
-      sourcesQueue.push(...newSources);
+      sourcesQueue = sourcesQueue.concat(newSources);
       lastSources = nextSources;
     }
 
     this.log.debug({ txIndex }, 'handling transaction done');
   }
 
   private async getEvents(blockNumber: number): Promise<EventsMap> {
-    const events: Event[] = [];
+    let events: Event[] = [];
 
     let continuationToken: string | undefined;
     do {
@@ -318,7 +318,7 @@ export class StarknetProvider extends BaseProvider {
         continuation_token: continuationToken
       });
 
-      events.push(...result.events);
+      events = events.concat(result.events);
 
       continuationToken = result.continuation_token;
     } while (continuationToken);
@@ -345,7 +345,7 @@ export class StarknetProvider extends BaseProvider {
     toBlock: number,
     address: string
   ): Promise<CheckpointRecord[]> {
-    const events: Event[] = [];
+    let events: Event[] = [];
 
     let continuationToken: string | undefined;
     do {
@@ -357,7 +357,7 @@ export class StarknetProvider extends BaseProvider {
         continuation_token: continuationToken
       });
 
-      events.push(...result.events);
+      events = events.concat(result.events);
 
       continuationToken = result.continuation_token;
     } while (continuationToken);
@@ -369,15 +369,15 @@ export class StarknetProvider extends BaseProvider {
   }
 
   async getCheckpointsRange(fromBlock: number, toBlock: number): Promise<CheckpointRecord[]> {
-    const events: CheckpointRecord[] = [];
+    let events: CheckpointRecord[] = [];
 
     for (const source of this.instance.getCurrentSources(fromBlock)) {
       const addressEvents = await this.getCheckpointsRangeForAddress(
         fromBlock,
         toBlock,
         source.contract
       );
-      events.push(...addressEvents);
+      events = events.concat(addressEvents);
     }
 
     return events;