fix(types, perf): add void return types to untyped perf methods

packages/perf/lib/index.d.ts

@@ -109,7 +109,7 @@ export namespace FirebasePerformanceTypes {
      * @param attribute Name of the attribute. Max length is 40 chars.
      * @param value Value of the attribute. Max length is 100 chars.
      */
-    putAttribute(attribute: string, value: string);
+    putAttribute(attribute: string, value: string): void;
 
     /**
      * Gets the value of the metric with the given name in the current trace. If the metric
@@ -155,7 +155,7 @@ export namespace FirebasePerformanceTypes {
      * @param metricName Name of the metric to set. Must not have a leading or trailing whitespace, no leading underscore '_' character and have a max length of 32 characters.
      * @param value The value the metric should be set to.
      */
-    putMetric(metricName: string, value: number);
+    putMetric(metricName: string, value: number): void;
 
     /**
      * Increments the named metric by the `incrementBy` value.
@@ -169,7 +169,7 @@ export namespace FirebasePerformanceTypes {
      * @param metricName Name of the metric to increment. Must not have a leading or trailing whitespace, no leading underscore '_' character and have a max length of 32 characters.
      * @param incrementBy The value the metric should be incremented by.
      */
-    incrementMetric(metricName: string, incrementBy: number);
+    incrementMetric(metricName: string, incrementBy: number): void;
 
     /**
      * Removes a metric by name if it exists.
@@ -182,7 +182,7 @@ export namespace FirebasePerformanceTypes {
      *
      * @param metricName Name of the metric to remove.
      */
-    removeMetric(metricName: string);
+    removeMetric(metricName: string): void;
 
     /**
      * Marks the start time of the trace. Does nothing if already started.
@@ -256,7 +256,7 @@ export namespace FirebasePerformanceTypes {
      * @param attribute Name of the attribute. Max length is 40 chars.
      * @param value Value of the attribute. Max length is 100 chars.
      */
-    putAttribute(attribute: string, value: string);
+    putAttribute(attribute: string, value: string): void;
 
     /**
      * Removes an already added attribute. Does nothing if attribute does not exist.
@@ -269,7 +269,7 @@ export namespace FirebasePerformanceTypes {
      *
      * @param attribute Name of the attribute to be removed.
      */
-    removeAttribute(attribute: string);
+    removeAttribute(attribute: string): void;
 
     /**
      * Sets the httpResponse code of the request.
@@ -285,7 +285,7 @@ export namespace FirebasePerformanceTypes {
      *
      * @param code Value must be greater than 0. Set to null to remove. Invalid usage will be logged natively.
      */
-    setHttpResponseCode(code: number | null);
+    setHttpResponseCode(code: number | null): void;
 
     /**
      * Sets the size of the request payload.
@@ -299,7 +299,7 @@ export namespace FirebasePerformanceTypes {
      *
      * @param bytes Value must be greater than 0. Set to null to remove. Invalid usage will be logged natively.
      */
-    setRequestPayloadSize(bytes: number | null);
+    setRequestPayloadSize(bytes: number | null): void;
 
     /**
      * Sets the size of the response payload.
@@ -313,7 +313,7 @@ export namespace FirebasePerformanceTypes {
      *
      * @param bytes Value must be greater than 0. Set to null to remove. Invalid usage will be logged natively.
      */
-    setResponsePayloadSize(bytes: number | null);
+    setResponsePayloadSize(bytes: number | null): void;
 
     /**
      * Content type of the response e.g. `text/html` or `application/json`.
@@ -327,7 +327,7 @@ export namespace FirebasePerformanceTypes {
      *
      * @param contentType Valid string of MIME type. Set to null to remove. Invalid usage will be logged natively.
      */
-    setResponseContentType(contentType: string | null);
+    setResponseContentType(contentType: string | null): void;
 
     /**
      * Marks the start time of the request. Does nothing if already started.