test(karma-credential-loader): set credential expiration as date (#6353)

Author: kuhe

packages/karma-credential-loader/src/index.ts

@@ -14,7 +14,14 @@ function createCredentialPreprocessor() {
     })();
     // This will affect the generated (ES5) JS
     const regionCode = `var defaultRegion = '${region}';`;
-    const credentialsCode = `var credentials = ${JSON.stringify(credentials)};`;
+    let credentialsCode = `var credentials = ${JSON.stringify(credentials)};
+delete credentials.expiration;`;
+
+    if (Number.isInteger(credentials.expiration?.getTime?.())) {
+      credentialsCode += `
+credentials.expiration = new Date(${credentials.expiration!.getTime()});`;
+    }
+
     const isBrowser = `var isBrowser = true;`;
     const contents = content.split("\n");
     let idx = -1;