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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.
diff --git a/node_modules/@babel/helper-plugin-utils/src/index.js b/node_modules/@babel/helper-plugin-utils/src/index.js
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+export function declare(builder) {
+  return (api, options, dirname) => {
+    if (!api.assertVersion) {
+      // Inject a custom version of 'assertVersion' for Babel 6 and early
+      // versions of Babel 7's beta that didn't have it.
+      api = Object.assign(copyApiObject(api), {
+        assertVersion(range) {
+          throwVersionError(range, api.version);
+        },
+      });
+    }
+
+    return builder(api, options || {}, dirname);
+  };
+}
+
+function copyApiObject(api) {
+  // Babel >= 7 <= beta.41 passed the API as a new object that had
+  // babel/core as the prototype. While slightly faster, it also
+  // means that the Object.assign copy below fails. Rather than
+  // keep complexity, the Babel 6 behavior has been reverted and this
+  // normalizes all that for Babel 7.
+  let proto = null;
+  if (typeof api.version === "string" && /^7\./.test(api.version)) {
+    proto = Object.getPrototypeOf(api);
+    if (
+      proto &&
+      (!has(proto, "version") ||
+        !has(proto, "transform") ||
+        !has(proto, "template") ||
+        !has(proto, "types"))
+    ) {
+      proto = null;
+    }
+  }
+
+  return {
+    ...proto,
+    ...api,
+  };
+}
+
+function has(obj, key) {
+  return Object.prototype.hasOwnProperty.call(obj, key);
+}
+
+function throwVersionError(range, version) {
+  if (typeof range === "number") {
+    if (!Number.isInteger(range)) {
+      throw new Error("Expected string or integer value.");
+    }
+    range = `^${range}.0.0-0`;
+  }
+  if (typeof range !== "string") {
+    throw new Error("Expected string or integer value.");
+  }
+
+  const limit = Error.stackTraceLimit;
+
+  if (typeof limit === "number" && limit < 25) {
+    // Bump up the limit if needed so that users are more likely
+    // to be able to see what is calling Babel.
+    Error.stackTraceLimit = 25;
+  }
+
+  let err;
+  if (version.slice(0, 2) === "7.") {
+    err = new Error(
+      `Requires Babel "^7.0.0-beta.41", but was loaded with "${version}". ` +
+        `You'll need to update your @babel/core version.`,
+    );
+  } else {
+    err = new Error(
+      `Requires Babel "${range}", but was loaded with "${version}". ` +
+        `If you are sure you have a compatible version of @babel/core, ` +
+        `it is likely that something in your build process is loading the ` +
+        `wrong version. Inspect the stack trace of this error to look for ` +
+        `the first entry that doesn't mention "@babel/core" or "babel-core" ` +
+        `to see what is calling Babel.`,
+    );
+  }
+
+  if (typeof limit === "number") {
+    Error.stackTraceLimit = limit;
+  }
+
+  throw Object.assign(
+    err,
+    ({
+      code: "BABEL_VERSION_UNSUPPORTED",
+      version,
+      range,
+    }: any),
+  );
+}