From 84fa4be865158425fe8805011b2e946bc88121d6 Mon Sep 17 00:00:00 2001
From: Alexey Pyltsyn <lex61rus@gmail.com>
Date: Wed, 22 Apr 2020 15:28:14 +0300
Subject: [PATCH] fix(v2): ignore import declarations in excerpt (#2380)

* fix(v2): ignore import declarations in excerpt

* Update index.ts

Co-authored-by: Yangshun Tay <tay.yang.shun@gmail.com>
---
 packages/docusaurus-utils/src/index.ts | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/packages/docusaurus-utils/src/index.ts b/packages/docusaurus-utils/src/index.ts
index 80bddc33e2..695b4d6788 100644
--- a/packages/docusaurus-utils/src/index.ts
+++ b/packages/docusaurus-utils/src/index.ts
@@ -182,6 +182,9 @@ export function getSubFolder(file: string, refDir: string): string | null {
   return match && match[1];
 }
 
+// Regex for an import statement.
+const importRegexString = '^(.*import){1}(.+){0,1}\\s[\'"](.+)[\'"];';
+
 export function parse(
   fileString: string,
 ): {
@@ -193,7 +196,18 @@ export function parse(
 } {
   const options: {} = {
     excerpt: (file: matter.GrayMatterFile<string>): void => {
-      file.excerpt = file.content.trim().split('\n', 1).shift();
+      let fileContent = file.content.trimLeft();
+      
+      // Hacky way of stripping out import statements from the excerpt
+      // TODO: Find a better way to do so, possibly by compiling the Markdown content, 
+      // stripping out HTML tags and obtaining the first line.
+      if (RegExp(importRegexString).test(fileContent)) {
+        fileContent = fileContent
+          .replace(RegExp(importRegexString, 'gm'), '')
+          .trimLeft();
+      }
+
+      file.excerpt = fileContent.split('\n', 1).shift();
     },
   };