flow like the river

BACK_BACK/node_modules/graphql/language/location.js.flow

@@ -0,0 +1,26 @@
+// @flow strict
+import type { Source } from './source';
+
+/**
+ * Represents a location in a Source.
+ */
+export type SourceLocation = {|
+  +line: number,
+  +column: number,
+|};
+
+/**
+ * Takes a Source and a UTF-8 character offset, and returns the corresponding
+ * line and column as a SourceLocation.
+ */
+export function getLocation(source: Source, position: number): SourceLocation {
+  const lineRegexp = /\r\n|[\n\r]/g;
+  let line = 1;
+  let column = position + 1;
+  let match;
+  while ((match = lineRegexp.exec(source.body)) && match.index < position) {
+    line += 1;
+    column = position + 1 - (match.index + match[0].length);
+  }
+  return { line, column };
+}