From f87a7b379e9204bc835de87125371f709f77dc3c Mon Sep 17 00:00:00 2001
From: Jos de Jong <wjosdejong@gmail.com>
Date: Mon, 7 Mar 2022 16:21:37 +0100
Subject: [PATCH] fix: diff-sequences export not playing nice with Vite

---
 package.json                     |  2 +-
 src/lib/logic/sort.js            |  6 ++----
 tools/generateDiffSequenceEsm.js | 30 ++++++++++++++++++++++++++++++
 3 files changed, 33 insertions(+), 5 deletions(-)
 create mode 100644 tools/generateDiffSequenceEsm.js

diff --git a/package.json b/package.json
index 9e24d035..75d6f2e9 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "lint": "prettier --check --plugin-search-dir=. .",
     "__lint": "prettier --check --plugin-search-dir=. . && eslint --cache --ignore-path .gitignore .",
     "format": "prettier --write --plugin-search-dir=. .",
-    "prepare": "husky install && cd tools && node generateEmbeddedAceJsonWorker.js && cd ..",
+    "prepare": "husky install && cd tools && node generateEmbeddedAceJsonWorker.js && node generateDiffSequenceEsm.js && cd ..",
     "release": "npm run lint && npm test && standard-version && npm run package && git push && git push --tag && npm publish package/"
   },
   "dependencies": {
diff --git a/src/lib/logic/sort.js b/src/lib/logic/sort.js
index d53f9bc6..16b561b7 100644
--- a/src/lib/logic/sort.js
+++ b/src/lib/logic/sort.js
@@ -1,11 +1,9 @@
-import diffSequencesExport from 'diff-sequences'
+import diffSequence from '../generated/diffSequence.js'
 import { compileJSONPointer, getIn, setIn } from 'immutable-json-patch'
 import { first, initial, isEmpty, isEqual, last } from 'lodash-es'
 import naturalCompare from 'natural-compare-lite'
 import { parseJSONPointerWithArrayIndices } from '../utils/jsonPointer.js'
 
-const diffSequences = diffSequencesExport.default || diffSequencesExport
-
 export function caseInsensitiveNaturalCompare(a, b) {
   const aLower = typeof a === 'string' ? a.toLowerCase() : a
   const bLower = typeof b === 'string' ? b.toLowerCase() : b
@@ -166,7 +164,7 @@ export function sortOperationsMoveAdvanced(array, comparator) {
     return aIndex === sortedIndices[bIndex]
   }
 
-  diffSequences(size, size, isCommon, foundSubsequence)
+  diffSequence(size, size, isCommon, foundSubsequence)
   foundSubsequence(0, size, size)
 
   // every move will change the actual indices, so we've to adjust for that
diff --git a/tools/generateDiffSequenceEsm.js b/tools/generateDiffSequenceEsm.js
new file mode 100644
index 00000000..a035fc98
--- /dev/null
+++ b/tools/generateDiffSequenceEsm.js
@@ -0,0 +1,30 @@
+import { readFileSync, writeFileSync } from 'fs'
+
+// The original file contains an export that doesn't play nice with Vite
+// This script copies the source code and turns it into regular a ES module
+// The original export looks like:
+//
+//     Object.defineProperty(exports, '__esModule', {
+//       value: true
+//     });
+//     exports.default = diffSequence;
+//
+// The ESM export looks like:
+//
+//     export default diffSequence;
+
+const commonjsFile = '../node_modules/diff-sequences/build/index.js'
+const esmFile = '../src/lib/generated/diffSequence.js'
+const commonjsCode = String(readFileSync(commonjsFile))
+
+const commentsStart = commonjsCode.indexOf('/**')
+
+const esmHeader = `// esm version of diff-sequences
+// generated by ./tools/generateDiffSequenceEsm.js
+export default diffSequence;
+
+`
+
+const esmCode = esmHeader + commonjsCode.slice(commentsStart)
+
+writeFileSync(esmFile, esmCode)