初始化环境文件

node_modules/@smithy/util-endpoints/dist-es/lib/substring.js

@@ -0,0 +1,9 @@
+export const substring = (input, start, stop, reverse) => {
+    if (start >= stop || input.length < stop || /[^\u0000-\u007f]/.test(input)) {
+        return null;
+    }
+    if (!reverse) {
+        return input.substring(start, stop);
+    }
+    return input.substring(input.length - stop, input.length - start);
+};