diff --git a/.eslintrc.yml b/.eslintrc.yml
index 31c4aa1..e0b88f4 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -16,3 +16,4 @@ rules:
   '@typescript-eslint/space-before-function-paren': off
   '@typescript-eslint/explicit-function-return-type': off
   '@typescript-eslint/no-unsafe-argument': off
+  '@typescript-eslint/prefer-nullish-coalescing': off
diff --git a/src/index.ts b/src/index.ts
index 41f7b6e..e2d7e61 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -10,18 +10,18 @@ export class DtSqlParserSemAnalysePlugin {
   private readonly settings: PluginSettings = {}
 
   constructor (settings?: PluginSettings) {
-    this.settings = settings ?? {}
+    this.settings = settings || {}
   }
 
   public parse (sql: string, caret?: InsertCaretPlaceholderConfig) {
     const sqlAfterInsertCaret = insertCaret(sql, caret)
-    const sqlAfterPreprocess = preprocess(sqlAfterInsertCaret, this.settings.preprocessor ?? defaultPreprocessorList)
+    const sqlAfterPreprocess = preprocess(sqlAfterInsertCaret, this.settings.preprocessor || defaultPreprocessorList)
     const sqlParseResult = parse(
       sqlAfterPreprocess,
-      this.settings.parse?.parser ?? new PostgresSQL(),
-      this.settings.parse?.stmts ?? defaultStmts,
-      this.settings.parse?.entities ?? defaultEntities,
-      this.settings.parse?.rules ?? defaultRules
+      this.settings.parse?.parser || new PostgresSQL(),
+      this.settings.parse?.stmts || defaultStmts,
+      this.settings.parse?.entities || defaultEntities,
+      this.settings.parse?.rules || defaultRules
     )
     return sqlParseResult
   }