improvement: flow coverage

src/types/index.js

@@ -0,0 +1,53 @@
+// @flow
+import type { Node as ReactNode } from 'react';
+
+export type RenderCallback = (data: any) => ReactNode;
+
+export type Entry = (string[]) => string;
+
+export type WidgetFor = (string) => string;
+
+export type PageContext = {
+  tag: string,
+  category: string,
+  currentPage: number,
+  prevPagePath: string,
+  nextPagePath: string,
+  hasPrevPage: boolean,
+  hasNextPage: boolean
+};
+
+export type Node = {
+  fields: {
+    slug: string,
+    categorySlug?: string,
+    tagSlugs?: string[]
+  },
+  frontmatter: {
+    date: string,
+    description?: string,
+    category?: string,
+    tags?: string[],
+    title: string,
+  },
+  html: string,
+  id: string
+};
+
+export type Edge = {
+  node: Node
+};
+
+export type Edges = Array<Edge>;
+
+export type AllMarkdownRemark = {
+  allMarkdownRemark: {
+    edges: Edges,
+  },
+  group: {
+    fieldValue: string,
+    totalCount: number
+  }[]
+};
+
+export type MarkdownRemark = Node;