[New] order: added caseInsensitive as an additional option to alphabetize

 - imp: mutateRanksToAlphabetizeV2 added to handle case insensitive sorting
 - tests: add two test cases for alphabetize.caseInsensitive: true
 - docs: added documentation for new options: alphabetize.caseInsensitive
 - imp: merged mutateRanksToAlphabetizeV2 to original
 - changelog: updated with caseInsensitive addition

Author: dbrewer5

CHANGELOG.md

@@ -5,6 +5,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 This change log adheres to standards from [Keep a CHANGELOG](http://keepachangelog.com).
 
 ## [Unreleased]
+### Added
+- [`order`]: added `caseInsensitive` as an additional option to `alphabetize` ([#1586], thanks [@dbrewer5])
+
 ### Fixed
 - [`no-unused-modules`]: fix usage of `import/extensions` settings ([#1560], thanks [@stekycz])
 
@@ -625,6 +628,7 @@ for info on changes for earlier releases.
 
 [`memo-parser`]: ./memo-parser/README.md
 
+[#1586]: https://github.com/benmosher/eslint-plugin-import/pull/1586
 [#1563]: https://github.com/benmosher/eslint-plugin-import/pull/1563
 [#1560]: https://github.com/benmosher/eslint-plugin-import/pull/1560
 [#1551]: https://github.com/benmosher/eslint-plugin-import/pull/1551
@@ -1046,3 +1050,4 @@ for info on changes for earlier releases.
 [@randallreedjr]: https://github.com/randallreedjr
 [@Pessimistress]: https://github.com/Pessimistress
 [@stekycz]: https://github.com/stekycz
+[@dbrewer5]: https://github.com/dbrewer5

docs/rules/order.md

@@ -189,16 +189,18 @@ import index from './';
 import sibling from './foo';
 ```
 
-### `alphabetize: {order: asc|desc|ignore}`:
+### `alphabetize: {order: asc|desc|ignore, caseInsensitive: true|false}`:
 
 Sort the order within each group in alphabetical manner based on **import path**:
 
 - `order`: use `asc` to sort in ascending order, and `desc` to sort in descending order (default: `ignore`).
+- `caseInsensitive`: use `true` to ignore case, and `false` to consider case (default: `false`).
 
 Example setting:
 ```js
 alphabetize: {
   order: 'asc', /* sort in ascending order. Options: ['ignore', 'asc', 'desc'] */
+  caseInsensitive: true /* ignore case. Options: [true, false] */
 }
 ```
 
@@ -210,12 +212,14 @@ import React, { PureComponent } from 'react';
 import aTypes from 'prop-types';
 import { compose, apply } from 'xcompose';
 import * as classnames from 'classnames';
+import blist from 'BList';
 ```
 
 While this will pass:
 
 ```js
 /* eslint import/order: ["error", {"alphabetize": true}] */
+import blist from 'BList';
 import * as classnames from 'classnames';
 import aTypes from 'prop-types';
 import React, { PureComponent } from 'react';

src/rules/order.js

@@ -267,7 +267,7 @@ function importsSorterDesc(importA, importB) {
   return 0
 }
 
-function mutateRanksToAlphabetize(imported, order) {
+function mutateRanksToAlphabetize(imported, alphabetizeOptions) {
   const groupedByRanks = imported.reduce(function(acc, importedItem) {
     if (!Array.isArray(acc[importedItem.rank])) { 
       acc[importedItem.rank] = []
@@ -278,10 +278,11 @@ function mutateRanksToAlphabetize(imported, order) {
 
   const groupRanks = Object.keys(groupedByRanks)
 
-  const sorterFn = order === 'asc' ? importsSorterAsc : importsSorterDesc
+  const sorterFn = alphabetizeOptions.order === 'asc' ? importsSorterAsc : importsSorterDesc
+  const comparator = alphabetizeOptions.caseInsensitive ? (a, b) => sorterFn(String(a).toLowerCase(), String(b).toLowerCase()) : (a, b) => sorterFn(a, b);
   // sort imports locally within their group
   groupRanks.forEach(function(groupRank) {
-    groupedByRanks[groupRank].sort(sorterFn)
+    groupedByRanks[groupRank].sort(comparator)
   })
 
   // assign globally unique rank to each import
@@ -487,8 +488,9 @@ function makeNewlinesBetweenReport (context, imported, newlinesBetweenImports) {
 function getAlphabetizeConfig(options) {
   const alphabetize = options.alphabetize || {}
   const order = alphabetize.order || 'ignore'
+  const caseInsensitive = alphabetize.caseInsensitive || false
 
-  return {order}
+  return {order, caseInsensitive}
 }
 
 module.exports = {
@@ -540,6 +542,10 @@ module.exports = {
           alphabetize: {
             type: 'object',
             properties: {
+              caseInsensitive: {
+                type: 'boolean',
+                default: false,
+              },
               order: {
                 enum: ['ignore', 'asc', 'desc'],
                 default: 'ignore',
@@ -604,7 +610,7 @@ module.exports = {
         }
 
         if (alphabetize.order !== 'ignore') {
-          mutateRanksToAlphabetize(imported, alphabetize.order)
+          mutateRanksToAlphabetize(imported, alphabetize)
         }
 
         makeOutOfOrderReport(context, imported)

tests/src/rules/order.js

@@ -1870,5 +1870,51 @@ ruleTester.run('order', rule, {
         message: '`bar` import should occur before import of `Bar`',
       }],
     }),
+    // Option alphabetize {order: 'asc': caseInsensitive: true}
+    test({
+      code: `
+        import b from 'foo';
+        import a from 'Bar';
+
+        import index from './';
+      `,
+      output: `
+        import a from 'Bar';
+        import b from 'foo';
+
+        import index from './';
+      `,
+      options: [{
+        groups: ['external', 'index'],
+        alphabetize: {order: 'asc', caseInsensitive: true},
+      }],
+      errors: [{
+        ruleID: 'order',
+        message: '`Bar` import should occur before import of `foo`',
+      }],
+    }),
+    // Option alphabetize {order: 'desc': caseInsensitive: true}
+    test({
+      code: `
+        import a from 'Bar';
+        import b from 'foo';
+
+        import index from './';
+      `,
+      output: `
+        import b from 'foo';
+        import a from 'Bar';
+
+        import index from './';
+      `,
+      options: [{
+        groups: ['external', 'index'],
+        alphabetize: {order: 'desc', caseInsensitive: true},
+      }],
+      errors: [{
+        ruleID: 'order',
+        message: '`foo` import should occur before import of `Bar`',
+      }],
+    }),
   ].filter((t) => !!t),
 })