add src/formatters/stylish.js

Author: ExpCoderWeb

src/formatters/stylish.js

@@ -0,0 +1,30 @@
+const stylish = (tree) => {
+  const replacer = ' ';
+  const spacesCount = 2;
+
+  const indentSize = spacesCount;
+  const currentIndent = replacer.repeat(indentSize);
+  const closingBracketIndent = replacer.repeat(indentSize - spacesCount);
+
+  const properties = tree
+    .map((property) => {
+      switch (property.type) {
+        case 'added':
+          return `${currentIndent}+ ${property.key}: ${property.value}`;
+        case 'deleted':
+          return `${currentIndent}- ${property.key}: ${property.value}`;
+        case 'changed':
+          return `${currentIndent}- ${property.key}: ${property.oldValue}\n${currentIndent}+ ${property.key}: ${property.newValue}`;
+        default:
+          return `${currentIndent}  ${property.key}: ${property.value}`;
+      }
+    });
+
+  return [
+    '{',
+    ...properties,
+    `${closingBracketIndent}}`,
+  ].join('\n');
+};
+
+export default stylish;