Fix prevent-abbreviations fixer bug (#444)

rules/prevent-abbreviations.js

@@ -364,17 +364,26 @@ const shouldFix = variable => {
 	return !variableIdentifiers(variable).some(isExportedIdentifier);
 };
 
+const isIdentifierKeyOfNode = (identifier, node) =>
+	node.key === identifier ||
+	// In `babel-eslint` parent.key is not reference of identifier
+	// https://github.com/babel/babel-eslint/issues/809
+	(
+		node.key.type === identifier.type &&
+		node.key.name === identifier.name
+	);
+
 const isShorthandPropertyIdentifier = identifier => {
 	return identifier.parent.type === 'Property' &&
-		identifier.parent.key === identifier &&
-		identifier.parent.shorthand;
+		identifier.parent.shorthand &&
+		isIdentifierKeyOfNode(identifier, identifier.parent);
 };
 
 const isAssignmentPatternShorthandPropertyIdentifier = identifier => {
 	return identifier.parent.type === 'AssignmentPattern' &&
 		identifier.parent.left === identifier &&
 		identifier.parent.parent.type === 'Property' &&
-		identifier.parent.parent.key === identifier &&
+		isIdentifierKeyOfNode(identifier, identifier.parent.parent) &&
 		identifier.parent.parent.value === identifier.parent &&
 		identifier.parent.parent.shorthand;
 };

test/prevent-abbreviations.js

@@ -643,6 +643,12 @@ ruleTester.run('prevent-abbreviations', rule, {
 			options: customOptions,
 			errors: createErrors()
 		},
+		{
+			code: 'err => ({err})',
+			output: 'error => ({err: error})',
+			options: customOptions,
+			errors: createErrors()
+		},
 		{
 			code: 'const {err} = foo;',
 			output: 'const {err: error} = foo;',
@@ -1389,8 +1395,34 @@ babelRuleTester.run('prevent-abbreviations', rule, {
 			}
 		`
 	],
-
 	invalid: [
+		{
+			code: outdent`
+				function unicorn(unicorn) {
+					const {prop = {}} = unicorn;
+					return property;
+				}
+			`,
+			output: outdent`
+				function unicorn(unicorn) {
+					const {prop: property = {}} = unicorn;
+					return property;
+				}
+			`,
+			errors: createErrors()
+		},
+		{
+			code: '({err}) => err',
+			output: '({err: error}) => error',
+			options: customOptions,
+			errors: createErrors()
+		},
+		{
+			code: 'err => ({err})',
+			output: 'error => ({err: error})',
+			options: customOptions,
+			errors: createErrors()
+		},
 		{
 			code: 'Foo.customProps = {}',
 			options: checkPropertiesOptions,