constant-folding: Handle simple template strings in .join()s

babel · Aug 15, 2017 · f45656b · f45656b
1 parent ff2d722
commit f45656b
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diff --git a/packages/babel-plugin-minify-constant-folding/__tests__/constant-folding-test.js b/packages/babel-plugin-minify-constant-folding/__tests__/constant-folding-test.js
@@ -106,6 +106,7 @@ describe("constant-folding-plugin", () => {
     [null, 1].join("/");
     [/xyz/im, true].join("abc");
     [\`a\${xyz}\`].join("1");
+    [\`a\`, \`c\`].join('b');
 
     [1, 2, 3].length;
     [1, 2, 3][1];
@@ -140,6 +141,7 @@ describe("constant-folding-plugin", () => {
     "/1";
     "/xyz/imabctrue";
     [\`a\${xyz}\`].join("1");
+    "abc";
 
     3;
     2;

diff --git a/packages/babel-plugin-minify-constant-folding/src/replacements.js b/packages/babel-plugin-minify-constant-folding/src/replacements.js
@@ -56,6 +56,9 @@ module.exports = ({ types: t }) => {
               ) {
                 return el.value;
               }
+              if (t.isTemplateLiteral(el) && el.expressions.length === 0) {
+                return el.quasis[0].value.cooked;
+              }
               bad = true;
               return;
             })