Fix integer output in TOML format (#1458)

src/formats/__tests__/tomlFormatter.spec.js

@@ -0,0 +1,15 @@
+import tomlFormatter from '../toml';
+
+describe('tomlFormatter', () => {
+  it('should output TOML integer values without decimals', () => {
+    expect(
+      tomlFormatter.toFile({ testFloat: 123.456, testInteger: 789, title: 'TOML' })
+    ).toEqual(
+      [
+        'testFloat = 123.456',
+        'testInteger = 789',
+        'title = "TOML"'
+      ].join('\n')
+      );
+  });
+});

src/formats/toml.js

@@ -11,6 +11,10 @@ const outputReplacer = (key, value) => {
   if (value instanceof AssetProxy) {
     return `${ value.path }`;
   }
+  if (Number.isInteger(value)) {
+    // Return the string representation of integers so tomlify won't render with tenths (".0")
+    return value.toString();
+  }
   // Return `false` to use default (`undefined` would delete key).
   return false;
 };