chore(docs): Update Jest instructions for v27 (#31649)

Co-authored-by: Lennart <lekoarts@gmail.com>
gatsbyjs · May 31, 2021 · eb6f73b · eb6f73b
1 parent a4589d0
commit eb6f73b
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/docs/docs/how-to/testing/unit-testing.md b/docs/docs/how-to/testing/unit-testing.md
@@ -65,9 +65,12 @@ const babelOptions = {
   presets: ["babel-preset-gatsby"],
 }
 
-module.exports = require("babel-jest").createTransformer(babelOptions)
+module.exports = require("babel-jest").default.createTransformer(babelOptions)
 ```
 
+> **Note:** If you're using Jest 26.6.3 or below, the last line has to be changed to
+> `module.exports = require("babel-jest").createTransformer(babelOptions)`
+
 - The next option is `moduleNameMapper`. This
   section works a bit like webpack rules and tells Jest how to handle imports.
   You are mainly concerned here with mocking static file imports, which Jest can't