From 45021637d64a36a389df5adb66c29faffd4a07c5 Mon Sep 17 00:00:00 2001
From: Roman Hotsiy <gotsijroman@gmail.com>
Date: Sat, 4 May 2024 17:13:51 +0800
Subject: [PATCH] fix: do not return partial matches for threshold 0

---
 src/search/bitap/search.js |  2 +-
 test/fuzzy-search.test.js  | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/src/search/bitap/search.js b/src/search/bitap/search.js
index 03041af75..bf0a9548a 100644
--- a/src/search/bitap/search.js
+++ b/src/search/bitap/search.js
@@ -112,7 +112,7 @@ export default function search(
       let currentLocation = j - 1
       let charMatch = patternAlphabet[text.charAt(currentLocation)]
 
-      if (computeMatches) {
+      if (computeMatches && threshold !== 0) {
         // Speed up: quick bool to int conversion (i.e, `charMatch ? 1 : 0`)
         matchMask[currentLocation] = +!!charMatch
       }
diff --git a/test/fuzzy-search.test.js b/test/fuzzy-search.test.js
index a35526ee7..92c4d2f7c 100644
--- a/test/fuzzy-search.test.js
+++ b/test/fuzzy-search.test.js
@@ -840,6 +840,34 @@ describe('Searching with minCharLength', () => {
   })
 })
 
+describe('Searching with threshold 0', () => {
+  const customList = ['t te tes test tes te t']
+  let fuse
+
+  beforeEach(
+    () =>
+      (fuse = new Fuse(customList, {
+        includeMatches: true,
+        threshold: 0,
+        ignoreLocation: true,
+      }))
+  )
+
+  describe('When searching for the term "test"', () => {
+    let result
+    beforeEach(() => (result = fuse.search('test')))
+
+    test('We get a match containing 1 indices', () => {
+      expect(result[0].matches[0].indices).toHaveLength(1)
+    })
+
+    test('and the matching index is a exact match', () => {
+      expect(result[0].matches[0].indices[0][0]).toBe(9)
+      expect(result[0].matches[0].indices[0][1]).toBe(12)
+    })
+  })
+})
+
 describe('Searching with minCharLength and pattern larger than machine word size', () => {
   const customList = [
     'Apple pie is a tasty treat that is always best made by mom! But we love store bought too.',