A function that converts JSON into YAML for downloading

src/utils/JsonToYaml.js

@@ -0,0 +1,87 @@
+import { typeOf } from 'remedial';
+
+const trimWhitespace = (input) => input.split('\n').map(x => x.trimRight()).join('\n');
+
+const throwError = (msg) => {
+  throw new Error(`Error in Json to YAML conversion: ${msg}`);
+};
+
+/* A function that converts valid JSON into valid YAML */
+const stringify = (data) => {
+  let indentLevel = '';
+  const handlers = {
+    undefined() {
+      return 'null';
+    },
+    null() {
+      return 'null';
+    },
+    number(x) {
+      return x;
+    },
+    boolean(x) {
+      return x ? 'true' : 'false';
+    },
+    string(x) {
+      return JSON.stringify(x);
+    },
+    array(x) {
+      let output = '';
+      if (x.length === 0) {
+        output += '[]';
+        return output;
+      }
+
+      indentLevel = indentLevel.replace(/$/, '  ');
+      x.forEach((y) => {
+        const handler = handlers[typeOf(y)];
+
+        if (!handler) throwError(typeOf(y));
+
+        output += `\n${indentLevel}- ${handler(y, true)}`;
+      });
+      indentLevel = indentLevel.replace(/ {2}/, '');
+
+      return output;
+    },
+    object(x, inArray, rootNode) {
+      let output = '';
+
+      if (Object.keys(x).length === 0) {
+        output += '{}';
+        return output;
+      }
+
+      if (!rootNode) {
+        indentLevel = indentLevel.replace(/$/, '  ');
+      }
+
+      Object.keys(x).forEach((k, i) => {
+        const val = x[k];
+        const handler = handlers[typeOf(val)];
+
+        if (typeof val === 'undefined') {
+          return;
+        }
+
+        if (!handler) throwError(typeOf(val));
+
+        if (!(inArray && i === 0)) {
+          output += `\n${indentLevel}`;
+        }
+
+        output += `${k}: ${handler(val)}`;
+      });
+      indentLevel = indentLevel.replace(/ {2}/, '');
+
+      return output;
+    },
+    function() {
+      return '[object Function]';
+    },
+  };
+
+  return trimWhitespace(`${handlers[typeOf(data)](data, true, true)}\n`);
+};
+
+export default stringify;