From e58409b144e35227122eb8e4154caf76c7bf4d11 Mon Sep 17 00:00:00 2001
From: Justin Ridgewell <justin@ridgewell.name>
Date: Fri, 29 Sep 2017 04:12:46 -0400
Subject: [PATCH] Indirect eval

---
 .../babel-plugin-transform-pipeline-operator/src/index.js | 6 +++++-
 .../fixtures/pipeline-operator/indirect-eval/actual.js    | 7 +++++++
 .../test/fixtures/pipeline-operator/indirect-eval/exec.js | 7 +++++++
 .../fixtures/pipeline-operator/indirect-eval/expected.js  | 8 ++++++++
 4 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 packages/babel-plugin-transform-pipeline-operator/test/fixtures/pipeline-operator/indirect-eval/actual.js
 create mode 100644 packages/babel-plugin-transform-pipeline-operator/test/fixtures/pipeline-operator/indirect-eval/exec.js
 create mode 100644 packages/babel-plugin-transform-pipeline-operator/test/fixtures/pipeline-operator/indirect-eval/expected.js

diff --git a/packages/babel-plugin-transform-pipeline-operator/src/index.js b/packages/babel-plugin-transform-pipeline-operator/src/index.js
index f86b712c7e..ba0f422f4c 100644
--- a/packages/babel-plugin-transform-pipeline-operator/src/index.js
+++ b/packages/babel-plugin-transform-pipeline-operator/src/index.js
@@ -7,7 +7,9 @@ export default function({ types: t }) {
     visitor: {
       BinaryExpression(path) {
         const { scope } = path;
-        const { operator, left, right } = path.node;
+        const { node } = path;
+        const { operator, left } = node;
+        let { right } = node;
         if (operator !== "|>") return;
 
         let optimizeArrow =
@@ -21,6 +23,8 @@ export default function({ types: t }) {
           } else if (params.length > 1) {
             optimizeArrow = false;
           }
+        } else if (t.isIdentifier(right, { name: "eval" })) {
+          right = t.sequenceExpression([t.numericLiteral(0), right]);
         }
 
         if (optimizeArrow && !param) {
diff --git a/packages/babel-plugin-transform-pipeline-operator/test/fixtures/pipeline-operator/indirect-eval/actual.js b/packages/babel-plugin-transform-pipeline-operator/test/fixtures/pipeline-operator/indirect-eval/actual.js
new file mode 100644
index 0000000000..41e11d0f77
--- /dev/null
+++ b/packages/babel-plugin-transform-pipeline-operator/test/fixtures/pipeline-operator/indirect-eval/actual.js
@@ -0,0 +1,7 @@
+(function() {
+  'use strict';
+  var result = '(function() { return this; })()'
+    |> eval;
+
+  assert.notEqual(result, undefined);
+})();
diff --git a/packages/babel-plugin-transform-pipeline-operator/test/fixtures/pipeline-operator/indirect-eval/exec.js b/packages/babel-plugin-transform-pipeline-operator/test/fixtures/pipeline-operator/indirect-eval/exec.js
new file mode 100644
index 0000000000..41e11d0f77
--- /dev/null
+++ b/packages/babel-plugin-transform-pipeline-operator/test/fixtures/pipeline-operator/indirect-eval/exec.js
@@ -0,0 +1,7 @@
+(function() {
+  'use strict';
+  var result = '(function() { return this; })()'
+    |> eval;
+
+  assert.notEqual(result, undefined);
+})();
diff --git a/packages/babel-plugin-transform-pipeline-operator/test/fixtures/pipeline-operator/indirect-eval/expected.js b/packages/babel-plugin-transform-pipeline-operator/test/fixtures/pipeline-operator/indirect-eval/expected.js
new file mode 100644
index 0000000000..5af6132e9e
--- /dev/null
+++ b/packages/babel-plugin-transform-pipeline-operator/test/fixtures/pipeline-operator/indirect-eval/expected.js
@@ -0,0 +1,8 @@
+(function () {
+  'use strict';
+
+  var _functionReturn;
+
+  var result = (_functionReturn = '(function() { return this; })()', (0, eval)(_functionReturn));
+  assert.notEqual(result, undefined);
+})();