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+# @babel/helper-plugin-utils
+
+The intention of this module is to provide a place for us to expose a
+standardized API layer over top of what Babel's core API provides on its own.
+
+This is not aiming to implement APIs that are missing on a given Babel version,
+but it is means to provide clear error messages if a plugin is run on a version
+of Babel that doesn't have the APIs that the plugin is trying to use.
+
+Every one of Babel's core plugins and presets will use this module, and ideally
+because of that its size should be kept to a miminum because this may or may
+not be deduplicated when installed.
+
+
+## Usage
+
+```js
+import { declare } from "@babel/helper-plugin-utils";
+
+export default declare((api, options, dirname) => {
+  return {};
+});
+```
+
+
+## What this does
+
+Currently, this plugin provides a few services to ensure that plugins function
+well-enough to throw useful errors.
+
+### `options` is always passed
+
+Babel 6 does not pass a second parameter. This frequently means that plugins
+written for Babel 7 that use `options` will attempt to destructure options
+out of an `undefined` value. By supplying the default, we avoid that risk.
+
+### `api.assertVersion` always exists
+
+Babel 6 and early betas of Babel 7 do not have `assertVersion`, so this
+wrapper ensures that it exists and throws a useful error message when not
+supplied by Babel itself.