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node_modules/popper.js/src/utils/isModifierRequired.js

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+import find from './find';
+
+/**
+ * Helper used to know if the given modifier depends from another one.<br />
+ * It checks if the needed modifier is listed and enabled.
+ * @method
+ * @memberof Popper.Utils
+ * @param {Array} modifiers - list of modifiers
+ * @param {String} requestingName - name of requesting modifier
+ * @param {String} requestedName - name of requested modifier
+ * @returns {Boolean}
+ */
+export default function isModifierRequired(
+  modifiers,
+  requestingName,
+  requestedName
+) {
+  const requesting = find(modifiers, ({ name }) => name === requestingName);
+
+  const isRequired =
+    !!requesting &&
+    modifiers.some(modifier => {
+      return (
+        modifier.name === requestedName &&
+        modifier.enabled &&
+        modifier.order < requesting.order
+      );
+    });
+
+  if (!isRequired) {
+    const requesting = `\`${requestingName}\``;
+    const requested = `\`${requestedName}\``;
+    console.warn(
+      `${requested} modifier is required by ${requesting} modifier in order to work, be sure to include it before ${requesting}!`
+    );
+  }
+  return isRequired;
+}