Eslint prefer-object-spread (#9466)

* The rule.

* The result

superset-frontend/spec/javascripts/components/AlteredSliceTag_spec.jsx

@@ -116,7 +116,7 @@ describe('AlteredSliceTag', () => {
   let props;
 
   beforeEach(() => {
-    props = Object.assign({}, defaultProps);
+    props = { ...defaultProps };
     wrapper = shallow(<AlteredSliceTag {...props} />);
   });
 
@@ -140,8 +140,8 @@ describe('AlteredSliceTag', () => {
 
   it('sets new diffs when receiving new props', () => {
     const newProps = {
-      currentFormData: Object.assign({}, props.currentFormData),
-      origFormData: Object.assign({}, props.origFormData),
+      currentFormData: { ...props.currentFormData },
+      origFormData: { ...props.origFormData },
     };
     newProps.currentFormData.beta = 10;
     wrapper = shallow(<AlteredSliceTag {...props} />);

superset-frontend/spec/javascripts/components/Checkbox_spec.jsx

@@ -30,7 +30,7 @@ describe('Checkbox', () => {
 
   let wrapper;
   const factory = o => {
-    const props = Object.assign({}, defaultProps, o);
+    const props = { ...defaultProps, ...o };
     return shallow(<Checkbox {...props} />);
   };
   beforeEach(() => {

superset-frontend/spec/javascripts/components/ColumnOption_spec.jsx

@@ -39,7 +39,7 @@ describe('ColumnOption', () => {
   const factory = o => <ColumnOption {...o} />;
   beforeEach(() => {
     wrapper = shallow(factory(defaultProps));
-    props = Object.assign({}, defaultProps);
+    props = { ...defaultProps };
   });
   it('is a valid element', () => {
     expect(React.isValidElement(<ColumnOption {...defaultProps} />)).toBe(true);

superset-frontend/spec/javascripts/components/MetricOption_spec.jsx

@@ -40,7 +40,7 @@ describe('MetricOption', () => {
   const factory = o => <MetricOption {...o} />;
   beforeEach(() => {
     wrapper = shallow(factory(defaultProps));
-    props = Object.assign({}, defaultProps);
+    props = { ...defaultProps };
   });
   it('is a valid element', () => {
     expect(React.isValidElement(<MetricOption {...defaultProps} />)).toBe(true);

superset-frontend/spec/javascripts/components/OnPasteSelect_spec.jsx

@@ -54,9 +54,9 @@ describe('OnPasteSelect', () => {
   let evt;
   let expected;
   beforeEach(() => {
-    props = Object.assign({}, defaultProps);
+    props = { ...defaultProps };
     wrapper = shallow(<OnPasteSelect {...props} />);
-    evt = Object.assign({}, defaultEvt);
+    evt = { ...defaultEvt };
   });
 
   it('renders the supplied selectWrap component', () => {

superset-frontend/spec/javascripts/components/OptionDescription_spec.jsx

@@ -34,7 +34,7 @@ describe('OptionDescription', () => {
   let props;
 
   beforeEach(() => {
-    props = { option: Object.assign({}, defaultProps.option) };
+    props = { option: { ...defaultProps.option } };
     wrapper = shallow(<OptionDescription {...props} />);
   });
 

superset-frontend/spec/javascripts/components/PopoverSection_spec.jsx

@@ -32,7 +32,7 @@ describe('PopoverSection', () => {
 
   let wrapper;
   const factory = overrideProps => {
-    const props = Object.assign({}, defaultProps, overrideProps || {});
+    const props = { ...defaultProps, ...(overrideProps || {}) };
     return shallow(<PopoverSection {...props} />);
   };
   beforeEach(() => {

superset-frontend/spec/javascripts/components/VirtualizedRendererWrap_spec.jsx

@@ -48,7 +48,7 @@ describe('VirtualizedRendererWrap', () => {
   let props;
   beforeEach(() => {
     wrapper = shallow(<RendererWrap {...defaultProps} />);
-    props = Object.assign({}, defaultProps);
+    props = { ...defaultProps };
   });
 
   it('uses the provided renderer', () => {

superset-frontend/spec/javascripts/explore/components/TextArea_spec.jsx

@@ -48,7 +48,7 @@ describe('SelectControl', () => {
   });
 
   it('renders a AceEditor when language is specified', () => {
-    const props = Object.assign({}, defaultProps);
+    const props = { ...defaultProps };
     props.language = 'markdown';
     wrapper = shallow(<TextAreaControl {...props} />);
     expect(wrapper.find(FormControl)).toHaveLength(0);

superset-frontend/spec/javascripts/profile/fixtures.jsx

@@ -43,4 +43,4 @@ export const user = {
     database_access: ['db1', 'db2', 'db3'],
   },
 };
-export const userNoPerms = Object.assign({}, user, { permissions: {} });
+export const userNoPerms = { ...user, permissions: {} };

superset-frontend/spec/javascripts/sqllab/ResultSet_spec.jsx

@@ -38,15 +38,9 @@ describe('ResultSet', () => {
     query: queries[0],
     height: 0,
   };
-  const stoppedQueryProps = Object.assign({}, mockedProps, {
-    query: stoppedQuery,
-  });
-  const runningQueryProps = Object.assign({}, mockedProps, {
-    query: runningQuery,
-  });
-  const cachedQueryProps = Object.assign({}, mockedProps, {
-    query: cachedQuery,
-  });
+  const stoppedQueryProps = { ...mockedProps, query: stoppedQuery };
+  const runningQueryProps = { ...mockedProps, query: runningQuery };
+  const cachedQueryProps = { ...mockedProps, query: cachedQuery };
   const newProps = {
     query: {
       cached: false,
@@ -94,11 +88,12 @@ describe('ResultSet', () => {
     });
     it('should render empty results', () => {
       const wrapper = shallow(<ResultSet {...mockedProps} />);
-      const emptyResults = Object.assign({}, queries[0], {
+      const emptyResults = {
+        ...queries[0],
         results: {
           data: [],
         },
-      });
+      };
       wrapper.setProps({ query: emptyResults });
       expect(wrapper.find(FilterableTable)).toHaveLength(0);
       expect(wrapper.find(Alert)).toHaveLength(1);

superset-frontend/spec/javascripts/sqllab/TabbedSqlEditors_spec.jsx

@@ -37,10 +37,7 @@ describe('TabbedSqlEditors', () => {
   const tabHistory = ['dfsadfs', 'newEditorId'];
 
   const tables = [
-    Object.assign({}, table, {
-      dataPreviewQueryId: 'B1-VQU1zW',
-      queryEditorId: 'newEditorId',
-    }),
+    { ...table, dataPreviewQueryId: 'B1-VQU1zW', queryEditorId: 'newEditorId' },
   ];
 
   const queryEditors = [

superset-frontend/spec/javascripts/sqllab/fixtures.js

@@ -19,7 +19,7 @@
 import sinon from 'sinon';
 import * as actions from '../../../src/SqlLab/actions/sqlLab';
 
-export const mockedActions = sinon.stub(Object.assign({}, actions));
+export const mockedActions = sinon.stub({ ...actions });
 
 export const alert = { bsStyle: 'danger', msg: 'Ooops', id: 'lksvmcx32' };
 export const table = {
@@ -388,7 +388,7 @@ export const runningQuery = {
   state: 'running',
   startDttm: Date.now() - 500,
 };
-export const cachedQuery = Object.assign({}, queries[0], { cached: true });
+export const cachedQuery = { ...queries[0], cached: true };
 
 export const initialState = {
   sqlLab: {

superset-frontend/spec/javascripts/sqllab/reducers/sqlLab_spec.js

@@ -141,7 +141,7 @@ describe('sqlLabReducer', () => {
     let newState;
     let newTable;
     beforeEach(() => {
-      newTable = Object.assign({}, table);
+      newTable = { ...table };
       const action = {
         type: actions.MERGE_TABLE,
         table: newTable,