update: prebid version to 6.7

.babelrc.js

@@ -14,16 +14,7 @@ module.exports = {
     [
       useLocal('@babel/preset-env'),
       {
-        "targets": {
-          "browsers": [
-            "chrome >= 75",
-            "safari >=10",
-            "edge >= 70",
-            "ff >= 70",
-            "ie >= 11",
-            "ios >= 11"
-          ]
-        }
+        "useBuiltIns": "entry"
       }
     ]
   ],

.circleci/config.yml

@@ -3,7 +3,7 @@
 # Check https://circleci.com/docs/2.0/language-javascript/ for more details
 #
 
-aliases:
+aliases: 
   - &environment
       docker:
         # specify the version you desire here
@@ -17,8 +17,9 @@ aliases:
 
   - &restore_dep_cache
       keys:
-        - v5.20.x-legacy-dependencies-{{ checksum "package.json" }}
-        - v5.20.x-legacy-dependencies-
+        - v1-dependencies-{{ checksum "package.json" }}
+        # fallback to using the latest cache if no exact match is found
+        - v1-dependencies-
 
   - &save_dep_cache
       paths:
@@ -51,7 +52,7 @@ aliases:
   - &unit_test_steps
     - checkout
     - restore_cache: *restore_dep_cache
-    - run: npm install
+    - run: npm ci
     - save_cache: *save_dep_cache
     - run: *install
     - run: *setup_browserstack
@@ -71,7 +72,7 @@ jobs:
   build:
     <<: *environment
     steps: *unit_test_steps
-
+      
   e2etest:
     <<: *environment
     steps: *endtoend_test_steps

README.md

@@ -59,6 +59,8 @@ module.exports = {
           loader: 'babel-loader',
           // presets and plugins for Prebid.js must be manually specified separate from your other babel rule.
           // this can be accomplished by requiring prebid's .babelrc.js file (requires Babel 7 and Node v8.9.0+)
+          // as of Prebid 6, babelrc.js only targets modern browsers. One can change the targets and build for
+          // older browsers if they prefer, but integration tests on ie11 were removed in Prebid.js 6.0
           options: require('prebid.js/.babelrc.js')
         }
       }
@@ -272,7 +274,7 @@ As you make code changes, the bundles will be rebuilt and the page reloaded auto
 
 ## Contribute
 
-Many SSPs, bidders, and publishers have contributed to this project. [Hundreds of bidders](https://github.com/prebid/Prebid.js/tree/master/src/adapters) are supported by Prebid.js.
+Many SSPs, bidders, and publishers have contributed to this project. [Hundreds of bidders](https://github.com/prebid/Prebid.js/tree/master/modules) are supported by Prebid.js.
 
 For guidelines, see [Contributing](./CONTRIBUTING.md).
 
@@ -314,7 +316,7 @@ For instructions on writing tests for Prebid.js, see [Testing Prebid.js](http://
 
 ### Supported Browsers
 
-Prebid.js is supported on IE11 and modern browsers.
+Prebid.js is supported on IE11 and modern browsers until 5.x. 6.x+ transpiles to target >0.25%; not Opera Mini; not IE11. 
 
 ### Governance
 Review our governance model [here](https://github.com/prebid/Prebid.js/tree/master/governance.md).

browsers.json

@@ -1,73 +1,49 @@
 {
-  "bs_edge_17_windows_10": {
+  "bs_edge_latest_windows_10": {
     "base": "BrowserStack",
     "os_version": "10",
     "browser": "edge",
-    "browser_version": "17.0",
+    "browser_version": "latest",
     "device": null,
     "os": "Windows"
   },
-  "bs_edge_90_windows_10": {
-    "base": "BrowserStack",
-    "os_version": "10",
-    "browser": "edge",
-    "browser_version": "90.0",
-    "device": null,
-    "os": "Windows"
-  },
-  "bs_ie_11_windows_10": {
-    "base": "BrowserStack",
-    "os_version": "10",
-    "browser": "ie",
-    "browser_version": "11.0",
-    "device": null,
-    "os": "Windows"
-  },
-  "bs_chrome_90_windows_10": {
+  "bs_chrome_latest_windows_10": {
     "base": "BrowserStack",
     "os_version": "10",
     "browser": "chrome",
-    "browser_version": "90.0",
+    "browser_version": "latest",
     "device": null,
     "os": "Windows"
   },
-  "bs_chrome_79_windows_10": {
+  "bs_chrome_87_windows_10": {
     "base": "BrowserStack",
     "os_version": "10",
     "browser": "chrome",
-    "browser_version": "79.0",
-    "device": null,
-    "os": "Windows"
-  },
-  "bs_firefox_88_windows_10": {
-    "base": "BrowserStack",
-    "os_version": "10",
-    "browser": "firefox",
-    "browser_version": "88.0",
+    "browser_version": "87.0",
     "device": null,
     "os": "Windows"
   },
-  "bs_firefox_72_windows_10": {
+  "bs_firefox_latest_windows_10": {
     "base": "BrowserStack",
     "os_version": "10",
     "browser": "firefox",
-    "browser_version": "72.0",
+    "browser_version": "latest",
     "device": null,
     "os": "Windows"
   },
-  "bs_safari_14_mac_bigsur": {
+  "bs_safari_latest_mac_bigsur": {
     "base": "BrowserStack",
     "os_version": "Big Sur",
     "browser": "safari",
-    "browser_version": "14.0",
+    "browser_version": "latest",
     "device": null,
     "os": "OS X"
   },
-  "bs_safari_12_mac_mojave": {
+  "bs_safari_15_catalina": {
     "base": "BrowserStack",
-    "os_version": "Mojave",
+    "os_version": "Catalina",
     "browser": "safari",
-    "browser_version": "12.0",
+    "browser_version": "13.1",
     "device": null,
     "os": "OS X"
   }