flow like the river

BACK_BACK/node_modules/graphql/utilities/introspectionFromSchema.js.flow

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+// @flow strict
+import invariant from '../jsutils/invariant';
+
+import { parse } from '../language/parser';
+
+import type { GraphQLSchema } from '../type/schema';
+
+import { executeSync } from '../execution/execute';
+
+import type {
+  IntrospectionQuery,
+  IntrospectionOptions,
+} from './getIntrospectionQuery';
+import { getIntrospectionQuery } from './getIntrospectionQuery';
+
+/**
+ * Build an IntrospectionQuery from a GraphQLSchema
+ *
+ * IntrospectionQuery is useful for utilities that care about type and field
+ * relationships, but do not need to traverse through those relationships.
+ *
+ * This is the inverse of buildClientSchema. The primary use case is outside
+ * of the server context, for instance when doing schema comparisons.
+ */
+export function introspectionFromSchema(
+  schema: GraphQLSchema,
+  options?: IntrospectionOptions,
+): IntrospectionQuery {
+  const optionsWithDefaults = {
+    specifiedByUrl: true,
+    directiveIsRepeatable: true,
+    schemaDescription: true,
+    inputValueDeprecation: true,
+    ...options,
+  };
+
+  const document = parse(getIntrospectionQuery(optionsWithDefaults));
+  const result = executeSync({ schema, document });
+  invariant(!result.errors && result.data);
+  return (result.data: any);
+}