From ff38aaff9511ef06e3a5c5d7c587807dc9903c32 Mon Sep 17 00:00:00 2001
From: Ika <ikatyang@gmail.com>
Date: Thu, 26 Apr 2018 18:22:43 +0800
Subject: [PATCH] fix(javascript): correct escape for markdown in js (#4381)

* test: add tests

* fix(javascript): correct escape for markdown in js

* test: add trailing newline
---
 src/language-js/embed.js                      |  7 +++--
 .../__snapshots__/jsfmt.spec.js.snap          | 29 +++++++++++++++++++
 tests/multiparser_js_markdown/escape.js       | 13 +++++++++
 3 files changed, 47 insertions(+), 2 deletions(-)
 create mode 100644 tests/multiparser_js_markdown/escape.js

diff --git a/src/language-js/embed.js b/src/language-js/embed.js
index 9fda2525c..aef329088 100644
--- a/src/language-js/embed.js
+++ b/src/language-js/embed.js
@@ -164,7 +164,10 @@ function embed(path, print, textToDoc /*, options */) {
             (parentParent.tag.name === "md" ||
               parentParent.tag.name === "markdown")))
       ) {
-        const text = parent.quasis[0].value.cooked;
+        const text = parent.quasis[0].value.raw.replace(
+          /((?:\\\\)*)\\`/g,
+          (_, backslashes) => "\\".repeat(backslashes.length / 2) + "`"
+        );
         const indentation = getIndentation(text);
         const hasIndent = indentation !== "";
         return concat([
@@ -207,7 +210,7 @@ function escapeBackticks(doc) {
 
     currentDoc.parts.forEach(part => {
       if (typeof part === "string") {
-        parts.push(part.replace(/`/g, "\\`"));
+        parts.push(part.replace(/(\\*)`/g, "$1$1\\`"));
       } else {
         parts.push(part);
       }
diff --git a/tests/multiparser_js_markdown/__snapshots__/jsfmt.spec.js.snap b/tests/multiparser_js_markdown/__snapshots__/jsfmt.spec.js.snap
index 490cbda44..2af1b8b38 100644
--- a/tests/multiparser_js_markdown/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/multiparser_js_markdown/__snapshots__/jsfmt.spec.js.snap
@@ -69,6 +69,35 @@ markdown\\\`
 
 `;
 
+exports[`escape.js 1`] = `
+markdown\`
+  const cssString = css\\\`
+    background-color: \\$\\{color('base')\\}
+  \\\`;
+\`
+
+markdown\`
+  - \\\`
+  - \\\\\\\`
+  - \\\\\\\\
+  - \\$
+  - \\u1234
+\`
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+markdown\`
+  const cssString = css\\\`background-color: \\$\\{color('base')\\}\\\`;
+\`;
+
+markdown\`
+  * \\\`
+  * \\\\\\\`
+  * \\\\\\\\
+  * \\$
+  * \\u1234
+\`;
+
+`;
+
 exports[`markdown.js 1`] = `
 export default function ReadMe() {
     return md\`
diff --git a/tests/multiparser_js_markdown/escape.js b/tests/multiparser_js_markdown/escape.js
new file mode 100644
index 000000000..055675844
--- /dev/null
+++ b/tests/multiparser_js_markdown/escape.js
@@ -0,0 +1,13 @@
+markdown`
+  const cssString = css\`
+    background-color: \$\{color('base')\}
+  \`;
+`
+
+markdown`
+  - \`
+  - \\\`
+  - \\\\
+  - \$
+  - \u1234
+`