From 9e088f1a5791bba2523dda2e002ee234f72a40fe Mon Sep 17 00:00:00 2001
From: Simen Bekkhus <sbekkhus91@gmail.com>
Date: Sun, 1 Nov 2020 02:03:29 +0100
Subject: [PATCH] replace variable reference with constant value

---
 .../src/__tests__/__snapshots__/hoistPlugin.test.ts.snap    | 2 +-
 packages/babel-plugin-jest-hoist/src/index.ts               | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/packages/babel-plugin-jest-hoist/src/__tests__/__snapshots__/hoistPlugin.test.ts.snap b/packages/babel-plugin-jest-hoist/src/__tests__/__snapshots__/hoistPlugin.test.ts.snap
index bb0deabba40c..227860db32e3 100644
--- a/packages/babel-plugin-jest-hoist/src/__tests__/__snapshots__/hoistPlugin.test.ts.snap
+++ b/packages/babel-plugin-jest-hoist/src/__tests__/__snapshots__/hoistPlugin.test.ts.snap
@@ -15,7 +15,7 @@ _getJestObj().mock("./App", () => () =>
     void 0,
     false,
     {
-      fileName: _jsxFileName,
+      fileName: "/root/project/src/file.js",
       lineNumber: 1,
       columnNumber: 32
     },
diff --git a/packages/babel-plugin-jest-hoist/src/index.ts b/packages/babel-plugin-jest-hoist/src/index.ts
index 6d02aefefefa..f952746674e6 100644
--- a/packages/babel-plugin-jest-hoist/src/index.ts
+++ b/packages/babel-plugin-jest-hoist/src/index.ts
@@ -146,7 +146,9 @@ FUNCTIONS.mock = args => {
             const initNode = binding.path.node.init;
 
             if (initNode && binding.constant && scope.isPure(initNode, true)) {
-              // how to hoist???
+              // replace the reference with its constant value
+              id.replaceWith(initNode);
+
               isAllowedIdentifier = true;
             }
           }
@@ -286,7 +288,7 @@ export default (): PluginObj<{
   visitor: {
     ExpressionStatement(exprStmt) {
       const jestObjExpr = extractJestObjExprIfHoistable(
-        exprStmt.get<'expression'>('expression'),
+        exprStmt.get('expression'),
       );
       if (jestObjExpr) {
         jestObjExpr.replaceWith(