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diff --git a/school/node_modules/graphql/utilities/coerceInputValue.js.flow b/school/node_modules/graphql/utilities/coerceInputValue.js.flow
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+++ b/school/node_modules/graphql/utilities/coerceInputValue.js.flow
@@ -0,0 +1,195 @@
+// @flow strict
+import objectValues from '../polyfills/objectValues';
+
+import type { Path } from '../jsutils/Path';
+import inspect from '../jsutils/inspect';
+import invariant from '../jsutils/invariant';
+import didYouMean from '../jsutils/didYouMean';
+import isObjectLike from '../jsutils/isObjectLike';
+import safeArrayFrom from '../jsutils/safeArrayFrom';
+import suggestionList from '../jsutils/suggestionList';
+import printPathArray from '../jsutils/printPathArray';
+import { addPath, pathToArray } from '../jsutils/Path';
+
+import { GraphQLError } from '../error/GraphQLError';
+
+import type { GraphQLInputType } from '../type/definition';
+import {
+  isLeafType,
+  isInputObjectType,
+  isListType,
+  isNonNullType,
+} from '../type/definition';
+
+type OnErrorCB = (
+  path: $ReadOnlyArray<string | number>,
+  invalidValue: mixed,
+  error: GraphQLError,
+) => void;
+
+/**
+ * Coerces a JavaScript value given a GraphQL Input Type.
+ */
+export function coerceInputValue(
+  inputValue: mixed,
+  type: GraphQLInputType,
+  onError: OnErrorCB = defaultOnError,
+): mixed {
+  return coerceInputValueImpl(inputValue, type, onError);
+}
+
+function defaultOnError(
+  path: $ReadOnlyArray<string | number>,
+  invalidValue: mixed,
+  error: GraphQLError,
+): void {
+  let errorPrefix = 'Invalid value ' + inspect(invalidValue);
+  if (path.length > 0) {
+    errorPrefix += ` at "value${printPathArray(path)}"`;
+  }
+  error.message = errorPrefix + ': ' + error.message;
+  throw error;
+}
+
+function coerceInputValueImpl(
+  inputValue: mixed,
+  type: GraphQLInputType,
+  onError: OnErrorCB,
+  path: Path | void,
+): mixed {
+  if (isNonNullType(type)) {
+    if (inputValue != null) {
+      return coerceInputValueImpl(inputValue, type.ofType, onError, path);
+    }
+    onError(
+      pathToArray(path),
+      inputValue,
+      new GraphQLError(
+        `Expected non-nullable type "${inspect(type)}" not to be null.`,
+      ),
+    );
+    return;
+  }
+
+  if (inputValue == null) {
+    // Explicitly return the value null.
+    return null;
+  }
+
+  if (isListType(type)) {
+    const itemType = type.ofType;
+
+    const coercedList = safeArrayFrom(inputValue, (itemValue, index) => {
+      const itemPath = addPath(path, index, undefined);
+      return coerceInputValueImpl(itemValue, itemType, onError, itemPath);
+    });
+
+    if (coercedList != null) {
+      return coercedList;
+    }
+
+    // Lists accept a non-list value as a list of one.
+    return [coerceInputValueImpl(inputValue, itemType, onError, path)];
+  }
+
+  if (isInputObjectType(type)) {
+    if (!isObjectLike(inputValue)) {
+      onError(
+        pathToArray(path),
+        inputValue,
+        new GraphQLError(`Expected type "${type.name}" to be an object.`),
+      );
+      return;
+    }
+
+    const coercedValue = {};
+    const fieldDefs = type.getFields();
+
+    for (const field of objectValues(fieldDefs)) {
+      const fieldValue = inputValue[field.name];
+
+      if (fieldValue === undefined) {
+        if (field.defaultValue !== undefined) {
+          coercedValue[field.name] = field.defaultValue;
+        } else if (isNonNullType(field.type)) {
+          const typeStr = inspect(field.type);
+          onError(
+            pathToArray(path),
+            inputValue,
+            new GraphQLError(
+              `Field "${field.name}" of required type "${typeStr}" was not provided.`,
+            ),
+          );
+        }
+        continue;
+      }
+
+      coercedValue[field.name] = coerceInputValueImpl(
+        fieldValue,
+        field.type,
+        onError,
+        addPath(path, field.name, type.name),
+      );
+    }
+
+    // Ensure every provided field is defined.
+    for (const fieldName of Object.keys(inputValue)) {
+      if (!fieldDefs[fieldName]) {
+        const suggestions = suggestionList(
+          fieldName,
+          Object.keys(type.getFields()),
+        );
+        onError(
+          pathToArray(path),
+          inputValue,
+          new GraphQLError(
+            `Field "${fieldName}" is not defined by type "${type.name}".` +
+              didYouMean(suggestions),
+          ),
+        );
+      }
+    }
+    return coercedValue;
+  }
+
+  // istanbul ignore else (See: 'https://github.com/graphql/graphql-js/issues/2618')
+  if (isLeafType(type)) {
+    let parseResult;
+
+    // Scalars and Enums determine if a input value is valid via parseValue(),
+    // which can throw to indicate failure. If it throws, maintain a reference
+    // to the original error.
+    try {
+      parseResult = type.parseValue(inputValue);
+    } catch (error) {
+      if (error instanceof GraphQLError) {
+        onError(pathToArray(path), inputValue, error);
+      } else {
+        onError(
+          pathToArray(path),
+          inputValue,
+          new GraphQLError(
+            `Expected type "${type.name}". ` + error.message,
+            undefined,
+            undefined,
+            undefined,
+            undefined,
+            error,
+          ),
+        );
+      }
+      return;
+    }
+    if (parseResult === undefined) {
+      onError(
+        pathToArray(path),
+        inputValue,
+        new GraphQLError(`Expected type "${type.name}".`),
+      );
+    }
+    return parseResult;
+  }
+
+  // istanbul ignore next (Not reachable. All possible input types have been considered)
+  invariant(false, 'Unexpected input type: ' + inspect((type: empty)));
+}