From f89759984a0b0c3ab39b572dfb065b3661452d3a Mon Sep 17 00:00:00 2001
From: ExE Boss <3889017+ExE-Boss@users.noreply.github.com>
Date: Sun, 4 Oct 2020 19:20:00 +0200
Subject: [PATCH] =?UTF-8?q?[New]=20`first`/TypeScript:=20Add=C2=A0support?=
 =?UTF-8?q?=20for=C2=A0`import=C2=A0=3D`=C2=A0expressions?=
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Content-Transfer-Encoding: 8bit

---
 CHANGELOG.md             |  4 +++
 src/rules/first.js       | 38 +++++++++++++++++++++++
 tests/src/rules/first.js | 66 +++++++++++++++++++++++++++++++++++++---
 3 files changed, 104 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2b47aaa55..eade81ac0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 This change log adheres to standards from [Keep a CHANGELOG](http://keepachangelog.com).
 
 ## [Unreleased]
+### Added
+- [`first`]/TypeScript: Add support for `import =` expressions ([#1917], thanks [@ExE-Boss])
 
 ### Fixed
 - [`export`]/TypeScript: properly detect export specifiers as children of a TS module block ([#1889], thanks [@andreubotella])
@@ -735,6 +737,7 @@ for info on changes for earlier releases.
 
 [`memo-parser`]: ./memo-parser/README.md
 
+[#1917]: https://github.com/benmosher/eslint-plugin-import/pull/1917
 [#1889]: https://github.com/benmosher/eslint-plugin-import/pull/1889
 [#1878]: https://github.com/benmosher/eslint-plugin-import/pull/1878
 [#1854]: https://github.com/benmosher/eslint-plugin-import/issues/1854
@@ -1281,3 +1284,4 @@ for info on changes for earlier releases.
 [@tomprats]: https://github.com/tomprats
 [@straub]: https://github.com/straub
 [@andreubotella]: https://github.com/andreubotella
+[@ExE-Boss]: https://github.com/ExE-Boss
diff --git a/src/rules/first.js b/src/rules/first.js
index c1422cdb0..f365f7652 100644
--- a/src/rules/first.js
+++ b/src/rules/first.js
@@ -75,6 +75,44 @@ module.exports = {
             } else {
               lastLegalImp = node
             }
+          } else if (node.type === 'TSImportEqualsDeclaration') {
+            const moduleReference = node.moduleReference
+            if (moduleReference.type !== 'TSExternalModuleReference') {
+              nonImportCount++
+            } else {
+              if (absoluteFirst) {
+                const source = moduleReference.expression
+                if (/^\./.test(source.value)) {
+                  anyRelative = true
+                } else if (anyRelative) {
+                  context.report({
+                    node: source,
+                    message: 'Absolute imports should come before relative imports.',
+                  })
+                }
+              }
+              if (nonImportCount > 0) {
+                for (let variable of context.getDeclaredVariables(node)) {
+                  if (!shouldSort) break
+                  const references = variable.references
+                  if (references.length) {
+                    for (let reference of references) {
+                      if (reference.identifier.range[0] < node.range[1]) {
+                        shouldSort = false
+                        break
+                      }
+                    }
+                  }
+                }
+                shouldSort && (lastSortNodesIndex = errorInfos.length)
+                errorInfos.push({
+                  node,
+                  range: [body[index - 1].range[1], node.range[1]],
+                })
+              } else {
+                lastLegalImp = node
+              }
+            }
           } else {
             nonImportCount++
           }
diff --git a/tests/src/rules/first.js b/tests/src/rules/first.js
index 8c5d72a34..640cadbd0 100644
--- a/tests/src/rules/first.js
+++ b/tests/src/rules/first.js
@@ -1,8 +1,9 @@
-import { test } from '../utils'
+import { test, getTSParsers } from '../utils'
 
 import { RuleTester } from 'eslint'
+import flatMap from 'array.prototype.flatmap'
 
-const ruleTester = new RuleTester()
+const ruleTester = new RuleTester({ parserOptions: { sourceType: 'module' } })
     , rule = require('rules/first')
 
 ruleTester.run('first', rule, {
@@ -16,7 +17,42 @@ ruleTester.run('first', rule, {
          })
   , test({ code: "'use directive';\
                   import { x } from 'foo';" })
-  ,
+  , ...flatMap(getTSParsers(), parser => [
+      test({
+        parser,
+        code: `
+          import fs = require('fs');
+          import { x } from './foo';
+          import { y } from './bar';
+        `,
+      }),
+      test({
+        parser,
+        code: `
+          import fs = require('fs');
+          import { x } from './foo';
+          import { y } from './bar';
+        `,
+        options: ['absolute-first'],
+      }),
+      test({
+        parser,
+        code: `
+          import { x } from './foo';
+          import fs = require('fs');
+          import { y } from './bar';
+        `,
+      }),
+      test({
+        parser,
+        code: `
+          import { x } from './foo';
+          import fs = require('fs');
+          import { y } from './bar';
+        `,
+        options: ['disable-absolute-first'],
+      }),
+    ]),
   ],
   invalid: [
     test({ code: "import { x } from './foo';\
@@ -65,6 +101,28 @@ ruleTester.run('first', rule, {
          , errors: 1
          , output: "import a from 'b'\nif (true) { console.log(1) }",
   })
-  ,
+  , ...flatMap(getTSParsers(), parser => [
+      {
+        parser,
+        code: `
+          import { x } from './foo';
+          import fs = require('fs');
+        `,
+        options: ['absolute-first'],
+        errors: 1,
+      },
+      {
+        parser,
+        code: `
+          var a = 1;
+          import fs = require('fs');
+        `,
+        errors: 1,
+        output: `
+          import fs = require('fs');
+          var a = 1;
+        `,
+      },
+    ]),
   ],
 })