Setup eslint and enforce rules

src/service/Canon.ts

@@ -1,5 +1,5 @@
-import {Canonical} from "./Canonical";
-import {Singleton} from "../di";
+import {Canonical} from './Canonical'
+import {Singleton} from '../di'
 
 /**
  * Error throw when a duplicate canonical key is registered.
@@ -40,7 +40,9 @@ export class Canon {
      * @return Canonical
      */
     resource<T>(key: string): Canonical<T> {
-        if ( !this.resources[key] ) throw new NoSuchCanonicalResolverKeyError(key)
+        if ( !this.resources[key] ) {
+            throw new NoSuchCanonicalResolverKeyError(key)
+        }
         return this.resources[key] as Canonical<T>
     }
 
@@ -48,9 +50,11 @@ export class Canon {
      * Register a canonical resource.
      * @param {Canonical} unit
      */
-    registerCanonical(unit: Canonical<any>) {
+    registerCanonical(unit: Canonical<any>): void {
         const key = unit.canonicalItems
-        if ( this.resources[key] ) throw new DuplicateResolverKeyError(key)
+        if ( this.resources[key] ) {
+            throw new DuplicateResolverKeyError(key)
+        }
         this.resources[key] = unit
     }
 }