diff --git a/experimental/packages/opentelemetry-sdk-metrics-base/src/Meter.ts b/experimental/packages/opentelemetry-sdk-metrics-base/src/Meter.ts
index f8422ff6ee..20c5730878 100644
--- a/experimental/packages/opentelemetry-sdk-metrics-base/src/Meter.ts
+++ b/experimental/packages/opentelemetry-sdk-metrics-base/src/Meter.ts
@@ -54,15 +54,27 @@ export class Meter implements metrics.Meter {
     return new UpDownCounter(storage, descriptor);
   }
 
-  createObservableGauge(_name: string, _options?: metrics.MetricOptions, _callback?: (observableResult: metrics.ObservableResult) => void): metrics.ObservableBase {
+  createObservableGauge(
+    _name: string,
+    _callback: (observableResult: metrics.ObservableResult) => void,
+    _options?: metrics.MetricOptions,
+  ): metrics.ObservableGauge {
     throw new Error('Method not implemented.');
   }
 
-  createObservableCounter(_name: string, _options?: metrics.MetricOptions, _callback?: (observableResult: metrics.ObservableResult) => void): metrics.ObservableBase {
+  createObservableCounter(
+    _name: string,
+    _callback: (observableResult: metrics.ObservableResult) => void,
+    _options?: metrics.MetricOptions,
+  ): metrics.ObservableBase {
     throw new Error('Method not implemented.');
   }
 
-  createObservableUpDownCounter(_name: string, _options?: metrics.MetricOptions, _callback?: (observableResult: metrics.ObservableResult) => void): metrics.ObservableBase {
+  createObservableUpDownCounter(
+    _name: string,
+    _callback: (observableResult: metrics.ObservableResult) => void,
+    _options?: metrics.MetricOptions,
+  ): metrics.ObservableBase {
     throw new Error('Method not implemented.');
   }
 
diff --git a/experimental/packages/opentelemetry-sdk-metrics-base/src/view/Predicate.ts b/experimental/packages/opentelemetry-sdk-metrics-base/src/view/Predicate.ts
index dd86990da6..5dfbb101a0 100644
--- a/experimental/packages/opentelemetry-sdk-metrics-base/src/view/Predicate.ts
+++ b/experimental/packages/opentelemetry-sdk-metrics-base/src/view/Predicate.ts
@@ -28,11 +28,12 @@ export interface Predicate {
  */
 export class PatternPredicate implements Predicate {
   private _matchAll: boolean;
-  private _regexp?: RegExp;
+  private _regexp: RegExp;
 
   constructor(pattern: string) {
     if (pattern === '*') {
       this._matchAll = true;
+      this._regexp = /.*/;
     } else {
       this._matchAll = false;
       this._regexp = new RegExp(PatternPredicate.escapePattern(pattern));
@@ -44,7 +45,7 @@ export class PatternPredicate implements Predicate {
       return true;
     }
 
-    return this._regexp!.test(str);
+    return this._regexp.test(str);
   }
 
   static escapePattern(pattern: string): string {