sort-keys TypeError on destructuring object assignment

[Mardak]

What version of ESLint are you using?
3.3.0

What parser (default, Babel-ESLint, etc.) are you using?
default ecmaVersion:6

Please show your full configuration:
sort-keys:2

What did you do? Please include the actual source code causing the issue.

let {a} = 0

What did you expect to happen?
no error

What actually happened? Please include the actual, raw output from ESLint.

Cannot read property 'prevName' of null
TypeError: Cannot read property 'prevName' of null
    at EventEmitter.Property (/usr/local/lib/node_modules/eslint/lib/rules/sort-keys.js:127:39)
    at emitOne (events.js:101:20)
    at EventEmitter.emit (events.js:188:7)
    at NodeEventGenerator.enterNode (/usr/local/lib/node_modules/eslint/lib/util/node-event-generator.js:40:22)
    at CodePathAnalyzer.enterNode (/usr/local/lib/node_modules/eslint/lib/code-path-analysis/code-path-analyzer.js:608:23)
    at CommentEventGenerator.enterNode (/usr/local/lib/node_modules/eslint/lib/util/comment-event-generator.js:97:23)
    at Controller.traverser.traverse.enter (/usr/local/lib/node_modules/eslint/lib/eslint.js:895:36)
    at Controller.__execute (/usr/local/lib/node_modules/eslint/node_modules/estraverse/estraverse.js:397:31)
    at Controller.traverse (/usr/local/lib/node_modules/eslint/node_modules/estraverse/estraverse.js:501:28)
    at Controller.Traverser.controller.traverse (/usr/local/lib/node_modules/eslint/lib/util/traverser.js:36:33)

@mysticatea #6800

[Mardak]

Looks like VariableDeclarator of node.id.type ObjectPattern should do something similar to what's being done for ObjectExpression to handle destructuring object assignment.

https://github.com/eslint/eslint/blob/master/lib/rules/sort-keys.js#L115

[kaicataldo]

Thanks for the bug report! Can confirm this is a bug. Checking the rule proposal, docs, and the rule's tests, it doesn't look to me like this was ever intended to sort destructuring patterns. Opened a PR to fix (will close if the intention was to check destructuring patterns).

[mysticatea]

Oops, I'm sorry.
This is the same mistake as #6886 .