fix(build): Fix linting issue and add linting to the pre-push hook (#440)

Author: ijemmy

Diff for: .husky/pre-push

@@ -1,4 +1,5 @@
 #!/bin/sh
 . "$(dirname "$0")/_/husky.sh"
 
+npm run lerna-lint
 npm run test

Diff for: packages/metrics/src/Metrics.ts

@@ -281,27 +281,6 @@ class Metrics implements MetricsInterface {
     this.storedMetrics = {};
   }
 
-  /**
-   * Throw an Error if the metrics buffer is empty.
-   *
-   * @example
-   *
-   * ```typescript
-   * import { Metrics, MetricUnits } from '@aws-lambda-powertools/metrics';
-   * import { Context } from 'aws-lambda';
-   *
-   * const metrics = new Metrics({namespace:"serverlessAirline", serviceName:"orders"});
-   *
-   * export const handler = async (event: any, context: Context) => {
-   *     metrics.throwOnEmptyMetrics();
-   *     metrics.publishStoredMetrics(); // will throw since no metrics added.
-   * }
-   * ```
-   */
-  public throwOnEmptyMetrics(): void {
-    this.shouldThrowOnEmptyMetrics = true;
-  }
-
   /**
    * Function to create the right object compliant with Cloudwatch EMF (Event Metric Format).
    * @see https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch_Embedded_Metric_Format_Specification.html for more details
@@ -386,6 +365,27 @@ class Metrics implements MetricsInterface {
     });
   }
 
+  /**
+   * Throw an Error if the metrics buffer is empty.
+   *
+   * @example
+   *
+   * ```typescript
+   * import { Metrics, MetricUnits } from '@aws-lambda-powertools/metrics';
+   * import { Context } from 'aws-lambda';
+   *
+   * const metrics = new Metrics({namespace:"serverlessAirline", serviceName:"orders"});
+   *
+   * export const handler = async (event: any, context: Context) => {
+   *     metrics.throwOnEmptyMetrics();
+   *     metrics.publishStoredMetrics(); // will throw since no metrics added.
+   * }
+   * ```
+   */
+  public throwOnEmptyMetrics(): void {
+    this.shouldThrowOnEmptyMetrics = true;
+  }
+
   private getCurrentDimensionsCount(): number {
     return Object.keys(this.dimensions).length + Object.keys(this.defaultDimensions).length;
   }