main repo

node_modules/jsx-ast-utils/lib/values/expressions/UpdateExpression.js

@@ -0,0 +1,33 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromUpdateExpression;
+/**
+ * Extractor function for an UpdateExpression type value node.
+ * An update expression is an expression with an update operator.
+ * For example, foo++ will evaluate to foo + 1.
+ *
+ * @param - value - AST Value object with type `UpdateExpression`
+ * @returns - The extracted value converted to correct type.
+ */
+function extractValueFromUpdateExpression(value) {
+  // eslint-disable-next-line global-require
+  var getValue = require('.').default;
+  var operator = value.operator,
+      argument = value.argument,
+      prefix = value.prefix;
+
+
+  var val = getValue(argument);
+
+  switch (operator) {
+    case '++':
+      return prefix ? ++val : val++; // eslint-disable-line no-plusplus
+    case '--':
+      return prefix ? --val : val--; // eslint-disable-line no-plusplus
+    default:
+      return undefined;
+  }
+}