added currency symbol arg to currency drictive

package.json

@@ -1,6 +1,6 @@
 {
   "name": "graphql-custom-directives",
-  "version": "0.2.13",
+  "version": "0.2.14",
   "description": "Create custom graphql directives with the ability to hook the execution of graphql",
   "main": "dist/index.js",
   "scripts": {

src/directives/currency.js

@@ -15,13 +15,17 @@ exports.GraphQLCurrencyDirective = new GraphQLCustomDirective({
       type: GraphQLString,
       description: 'A currency format given by numeral module',
     },
+    currencySymbol: {
+      type: GraphQLString,
+      description: 'A currency symbol to attach to the output (Numeral supports only one currency at a time, so this is an override)'
+    }
   },
-  resolve(resolve, source, {as}) {
+  resolve(resolve, source, {as, currencySymbol = ''}) {
     return resolve().then(input => {
       const format = as || DEFAULT_CURRENCY_FORMAT;
 
       if (format.indexOf('0') !== -1 && !Number.isNaN(Number(input))) {
-        return numeral(input).format(format) || input;
+        return `${currencySymbol}${numeral(input).format(format) || input}`;
       }
 
       return input;

test/directives/currency.js

@@ -55,4 +55,12 @@ describe('directives/currency', () => {
 
     testEqual({directives, query, expected, done});
   });
+
+  it('expected directive to use the supplied currency symbol', done => {
+    const query = `{ value(input: "10") @currency(as:"0,0.00", currencySymbol: "£") }`,
+      directives = [GraphQLCurrencyDirective],
+      expected = {value: '£10.00'};
+
+    testEqual({directives, query, expected, done});
+  });
 });