Set tslint rule trailing-comma to esSpecCompliant and refactored utils/map (#31)

* Set tslint rule 	railing-comma esSpecCompliant

* Refactored utils\map

Author: rstaib

src/utils/css.ts

@@ -4,8 +4,6 @@ import flatten from "./flatten";
 
 export default (
   strings: TemplateStringsArray,
-  // note: work-a-round -> tslint is expecting trailing comma here but this is a bug
-  // tslint:disable-next-line:trailing-comma
   ...interpolations: SimpleInterpolation[]
 ): string => {
   return flatten(css(strings, ...interpolations));

src/utils/map.ts

@@ -7,18 +7,19 @@ export default (
   theme?: Theme,
 ): BreakpointValuesMap | null => {
   if (source != null) {
-    const destination: BreakpointValuesMap = {};
+    return Object.keys(source).reduce<BreakpointValuesMap>(
+      (destination, propertyKey) => {
+        const values = prepare(source[propertyKey], theme);
 
-    Object.keys(source).forEach((propertyKey) => {
-      const values = prepare(source[propertyKey], theme);
+        Object.keys(values).forEach((breakpointKey) => {
+          destination[breakpointKey] = destination[breakpointKey] || {};
+          destination[breakpointKey][propertyKey] = values[breakpointKey];
+        });
 
-      Object.keys(values).forEach((breakpointKey) => {
-        destination[breakpointKey] = destination[breakpointKey] || {};
-        destination[breakpointKey][propertyKey] = values[breakpointKey];
-      });
-    });
-
-    return destination;
+        return destination;
+      },
+      {},
+    );
   }
 
   return null;

src/utils/resolve.ts

@@ -5,8 +5,6 @@ import _css from "./css";
 export default (breakpoints: BreakpointMap, key: string) => {
   return (
     strings: TemplateStringsArray,
-    // note: work-a-round -> tslint is expecting trailing comma here but this is a bug
-    // tslint:disable-next-line:trailing-comma
     ...interpolations: SimpleInterpolation[]
   ): string => {
     const minWidth = breakpoints[key];

tslint.json

@@ -36,6 +36,7 @@
     "trailing-comma": [
       true,
       {
+        "esSpecCompliant": true,
         "multiline": "always",
         "singleline": "never"
       }