Convert to ES module, document breaking changes

Author: adamreisnz

.babelrc

@@ -0,0 +1,10 @@
+{
+  "exclude": [
+    "node_modules",
+    "**/*.spec.js",
+    "src/helpers/handlers.js"
+  ],
+  "reporter": ["lcov", "text", "html"],
+  "sourceMap": false,
+  "cache": false
+}

.c8rc

@@ -1,8 +1,8 @@
 language: node_js
 node_js:
-  - "16"
   - "18"
   - "20"
+  - "22"
 branches:
   only:
     - master

.eslintignore

@@ -1,3 +1,15 @@
+## 8.0.0
+The package has been converted to an ES module and now requires Node 18 or higher. If you need support for Node 16 or below, please use version 7.x.x.
+
+### Breaking changes
+- Package has been converted to an ES module
+- No longer providing a default export. Use the named exports `replaceInFile` or `replaceInFileSync` instead.
+- The `replace.sync` syntax is no longer available. Use the named export `replaceInFileSync` instead.
+- The callback API has been removed for asynchronous replacements. Please use promises or `async/await` instead.
+- Configuration files provided to the CLI using the `--configFile` flag can now only be JSON.
+- To use a custom `fs` implementation, you must now specify `fs` config parameter for the async API, and `fsSync` for the sync API. For the asynchronous APIs, the provided `fs` must provide the `readFile` and `writeFile` methods. For the synchronous APIs, the provided `fsSync` must provide the `readFileSync` and `writeFileSync` methods.
+- If a `cwd` parameter is provided, it will no longer be prefixed to each path using basic string concatenation, but rather uses `path.join()` to ensure correct path concatenation.
+
 ## 7.0.0
 Strings provided to the `from` value are now escaped for regex matching when counting of matches is enabled. This is unlikely to result in any breaking changes, but as a precaution the major version has been bumped.