From bf8003891c404365a34108e22004cea3be54268e Mon Sep 17 00:00:00 2001
From: Michael C <michael@mchang.name>
Date: Fri, 7 Oct 2022 17:12:16 -0400
Subject: [PATCH] add configDiffPlugin

---
 webpack/configDiffPlugin.js | 66 +++++++++++++++++++++++++++++++++++++
 webpack/webpack.common.js   |  4 ++-
 2 files changed, 69 insertions(+), 1 deletion(-)
 create mode 100644 webpack/configDiffPlugin.js

diff --git a/webpack/configDiffPlugin.js b/webpack/configDiffPlugin.js
new file mode 100644
index 00000000..43456e87
--- /dev/null
+++ b/webpack/configDiffPlugin.js
@@ -0,0 +1,66 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+const { readFile } = require("fs/promises")
+let logger;
+
+const readFileContents = (name) => readFile(name)
+  .then(data => JSON.parse(data))
+
+// partialDeepEquals from ajayyy/SponsorBlockServer
+function partialDeepEquals (actual, expected, logger) {
+  // loop over key, value of expected
+  let failed = false;
+  for (const [ key, value ] of Object.entries(expected)) {
+    if (key === "serverAddress" || key === "testingServerAddress" || key === "serverAddressComment") continue
+    // if value is object, recurse
+    const actualValue = actual?.[key]
+    if (typeof value !== "string" && Array.isArray(value)) {
+      if (!arrayPartialDeepEquals(actualValue, value)) {
+        printActualExpected(key, actualValue, value, logger)
+        failed = true
+      }
+    } else if (typeof value === "object") {
+      if (partialDeepEquals(actualValue, value, logger)) {
+        console.log("obj failed")
+        printActualExpected(key, actualValue, value, logger)
+        failed = true
+      }
+    } else if (actualValue !== value) {
+      printActualExpected(key, actualValue, value, logger)
+      failed = true
+    }
+  }
+  return failed
+}
+
+const arrayPartialDeepEquals = (actual, expected) =>
+  expected.every(a => actual?.includes(a))
+
+function printActualExpected(key, actual, expected, logger) {
+  logger.error(`Differing value for: ${key}`)
+  logger.error(`Actual: ${JSON.stringify(actual)}`)
+  logger.error(`Expected: ${JSON.stringify(expected)}`)
+}
+
+class configDiffPlugin {
+  apply(compiler) {
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    compiler.hooks.done.tapAsync("configDiffPlugin", async (stats, callback) => {
+      logger = compiler.getInfrastructureLogger('configDiffPlugin')
+      logger.log('Checking for config.json diff...')
+      
+      // check example
+      const exampleConfig = await readFileContents("./config.json.example")
+      const currentConfig = await readFileContents("./config.json")
+
+      const difference = partialDeepEquals(currentConfig, exampleConfig, logger)
+      if (difference) {
+        logger.warn("config.json is missing values from config.json.example")
+      } else {
+        logger.info("config.json is not missing any values from config.json.example")
+      }
+      callback()
+    })
+  }
+}
+
+module.exports = configDiffPlugin;
\ No newline at end of file
diff --git a/webpack/webpack.common.js b/webpack/webpack.common.js
index d05dea03..0be6c63c 100644
--- a/webpack/webpack.common.js
+++ b/webpack/webpack.common.js
@@ -7,6 +7,7 @@ const BuildManifest = require('./webpack.manifest');
 const srcDir = '../src/';
 const fs = require("fs");
 const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin');
+const configDiffPlugin = require('./configDiffPlugin');
 
 const edgeLanguages = [
     "de",
@@ -116,6 +117,7 @@ module.exports = env => ({
             browser: env.browser,
             pretty: env.mode === "production",
             stream: env.stream
-        })
+        }),
+        new configDiffPlugin()
     ]
 });