初始化环境文件

node_modules/@aws-crypto/supports-web-crypto/README.md

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+# @aws-crypto/supports-web-crypto
+
+Functions to check web crypto support for browsers.
+
+## Usage
+
+```
+import {supportsWebCrypto} from '@aws-crypto/supports-web-crypto';
+
+if (supportsWebCrypto(window)) {
+  // window.crypto.subtle.encrypt will exist
+}
+
+```
+
+## supportsWebCrypto
+
+Used to make sure `window.crypto.subtle` exists and implements crypto functions
+as well as a cryptographic secure random source exists.
+
+## supportsSecureRandom
+
+Used to make sure that a cryptographic secure random source exists.
+Does not check for `window.crypto.subtle`.
+
+## supportsSubtleCrypto
+
+## supportsZeroByteGCM
+
+## Test
+
+`npm test`