Escape "</script" when inlining strings

packages/babel-plugin-minify-constant-folding/__tests__/constant-folding-test.js

@@ -60,4 +60,37 @@ describe("constant-folding-plugin", () => {
     `);
     expect(transform(source)).toBe(source);
   });
+
+  it("should handle script escape", () => {
+    const source = unpad(`
+      "</" + "script"
+    `);
+
+    const expected = unpad(`
+      "<\\\\/script";
+    `);
+    expect(transform(source)).toBe(expected);
+  });
+
+  it("should handle style escape", () => {
+    const source = unpad(`
+      "</" + "style"
+    `);
+
+    const expected = unpad(`
+      "<\\\\/style";
+    `);
+    expect(transform(source)).toBe(expected);
+  });
+
+  it("should handle html comment escape", () => {
+    const source = unpad(`
+      "<!" + "--"
+    `);
+
+    const expected = unpad(`
+      "\\\\x3C!--";
+    `);
+    expect(transform(source)).toBe(expected);
+  });
 });

packages/babel-plugin-minify-constant-folding/src/index.js

@@ -1,6 +1,7 @@
 "use strict";
 
 const evaluate = require("babel-helper-evaluate-path");
+const jsesc = require("jsesc");
 
 module.exports = ({ types: t, traverse }) => {
   const seen = Symbol("seen");
@@ -112,6 +113,13 @@ module.exports = ({ types: t, traverse }) => {
             }
           }
 
+          // https://github.com/babel/babili/issues/382
+          if (typeof res.value === "string") {
+            res.value = jsesc(res.value, {
+              isScriptContext: true
+            });
+          }
+
           const node = t.valueToNode(res.value);
           node[seen] = true;
           path.replaceWith(node);