fix: don't error when failing to load "ts-declaration-location"

Author: RebeccaStevens

lib/rules/no-sync.js

@@ -4,10 +4,18 @@
  */
 "use strict"
 
-const typeMatchesSpecifier =
-    /** @type {import('ts-declaration-location').default} */ (
-        /** @type {unknown} */ (require("ts-declaration-location"))
-    )
+let typeMatchesSpecifier =
+    /** @type {import('ts-declaration-location').default | undefined} */
+    (undefined)
+
+try {
+    typeMatchesSpecifier =
+        /** @type {import('ts-declaration-location').default} */ (
+            /** @type {unknown} */ (require("ts-declaration-location"))
+        )
+
+    // eslint-disable-next-line no-empty -- Deliberately left empty.
+} catch {}
 const getTypeOfNode = require("../util/get-type-of-node")
 const getParserServices = require("../util/get-parser-services")
 const getFullTypeName = require("../util/get-full-type-name")
@@ -137,7 +145,8 @@ module.exports = {
 
                     if (
                         parserServices === null ||
-                        parserServices.program === null
+                        parserServices.program === null ||
+                        typeMatchesSpecifier === undefined
                     ) {
                         throw new Error(
                             'TypeScript parser services not available. Rule "n/no-sync" is configured to use "ignores" option with a non-string value. This requires TypeScript parser services to be available.'