diff --git a/.eslintrc.yml b/.eslintrc.yml
index 2090b80caa..02a4b0aa42 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -317,7 +317,7 @@ rules:
   # https://eslint.org/docs/rules/#variables
 
   init-declarations: off
-  logical-assignment-operators: off # TODO
+  logical-assignment-operators: error
   no-delete-var: error
   no-label-var: error
   no-restricted-globals: off
diff --git a/resources/diff-npm-package.ts b/resources/diff-npm-package.ts
index c61f54aa32..147e4874fe 100644
--- a/resources/diff-npm-package.ts
+++ b/resources/diff-npm-package.ts
@@ -17,8 +17,8 @@ const { tmpDirPath } = makeTmpDir('graphql-js-npm-diff');
 const args = process.argv.slice(2);
 let [fromRevision, toRevision] = args;
 if (args.length < 2) {
-  fromRevision = fromRevision ?? 'HEAD';
-  toRevision = toRevision ?? LOCAL;
+  fromRevision ??= 'HEAD';
+  toRevision ??= LOCAL;
   console.warn(
     `Assuming you meant: diff-npm-package ${fromRevision} ${toRevision}`,
   );
diff --git a/resources/gen-changelog.ts b/resources/gen-changelog.ts
index baae5d15d4..9d106fbacc 100644
--- a/resources/gen-changelog.ts
+++ b/resources/gen-changelog.ts
@@ -91,7 +91,7 @@ async function genChangeLog(): Promise<string> {
     if (!labelsConfig[label]) {
       throw new Error(`Unknown label: ${label}. See ${pr.url}`);
     }
-    byLabel[label] = byLabel[label] || [];
+    byLabel[label] ??= [];
     byLabel[label].push(pr);
     committersByLogin[pr.author.login] = pr.author;
   }
diff --git a/resources/utils.ts b/resources/utils.ts
index ba0aa35471..ed46f9635a 100644
--- a/resources/utils.ts
+++ b/resources/utils.ts
@@ -149,7 +149,7 @@ export function showDirStats(dirPath: string): void {
     const ext = name.split('.').slice(1).join('.');
     const filetype = ext ? '*.' + ext : name;
 
-    fileTypes[filetype] = fileTypes[filetype] ?? { filepaths: [], size: 0 };
+    fileTypes[filetype] ??= { filepaths: [], size: 0 };
 
     totalSize += stats.size;
     fileTypes[filetype].size += stats.size;
diff --git a/src/language/blockString.ts b/src/language/blockString.ts
index 667f91831e..5f8d5f6127 100644
--- a/src/language/blockString.ts
+++ b/src/language/blockString.ts
@@ -23,7 +23,7 @@ export function dedentBlockStringLines(
       continue; // skip empty lines
     }
 
-    firstNonEmptyLine = firstNonEmptyLine ?? i;
+    firstNonEmptyLine ??= i;
     lastNonEmptyLine = i;
 
     if (i !== 0 && indent < commonIndent) {