From 15f2f171ab13b224757ca43483a456e409f12a0a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hu=C3=A1ng=20J=C3=B9nli=C3=A0ng?= <jlhwung@gmail.com>
Date: Wed, 28 Jul 2021 15:45:30 -0400
Subject: [PATCH] feat: support hack pipeline in `@babel/standalone` (#13555)

---
 .../babel-standalone/src/preset-stage-0.ts    |  4 +-
 .../babel-standalone/src/preset-stage-1.ts    |  6 ++-
 .../test/preset-stage-1.test.js               | 40 +++++++++++++++++++
 3 files changed, 48 insertions(+), 2 deletions(-)

diff --git a/packages/babel-standalone/src/preset-stage-0.ts b/packages/babel-standalone/src/preset-stage-0.ts
index 452991bcca..7add5af3e1 100644
--- a/packages/babel-standalone/src/preset-stage-0.ts
+++ b/packages/babel-standalone/src/preset-stage-0.ts
@@ -7,7 +7,8 @@ export default (_: any, opts: any = {}) => {
     useBuiltIns = false,
     decoratorsLegacy = false,
     decoratorsBeforeExport,
-    pipelineProposal = "minimal",
+    pipelineProposal,
+    pipelineTopicToken,
     importAssertionsVersion = "september-2020",
   } = opts;
 
@@ -21,6 +22,7 @@ export default (_: any, opts: any = {}) => {
           decoratorsLegacy,
           decoratorsBeforeExport,
           pipelineProposal,
+          pipelineTopicToken,
           importAssertionsVersion,
         },
       ],
diff --git a/packages/babel-standalone/src/preset-stage-1.ts b/packages/babel-standalone/src/preset-stage-1.ts
index 5448a3189c..aa47aa5eba 100644
--- a/packages/babel-standalone/src/preset-stage-1.ts
+++ b/packages/babel-standalone/src/preset-stage-1.ts
@@ -8,6 +8,7 @@ export default (_: any, opts: any = {}) => {
     decoratorsLegacy = false,
     decoratorsBeforeExport,
     pipelineProposal = "minimal",
+    pipelineTopicToken = "%",
     recordAndTupleSyntax: recordAndTupleSyntax = "hash",
   } = opts;
 
@@ -23,7 +24,10 @@ export default (_: any, opts: any = {}) => {
       [babelPlugins.syntaxRecordAndTuple, { syntaxType: recordAndTupleSyntax }],
       babelPlugins.syntaxModuleBlocks,
       babelPlugins.proposalExportDefaultFrom,
-      [babelPlugins.proposalPipelineOperator, { proposal: pipelineProposal }],
+      [
+        babelPlugins.proposalPipelineOperator,
+        { proposal: pipelineProposal, topicToken: pipelineTopicToken },
+      ],
       babelPlugins.proposalDoExpressions,
     ],
   };
diff --git a/packages/babel-standalone/test/preset-stage-1.test.js b/packages/babel-standalone/test/preset-stage-1.test.js
index 64b7c3f203..5279b60484 100644
--- a/packages/babel-standalone/test/preset-stage-1.test.js
+++ b/packages/babel-standalone/test/preset-stage-1.test.js
@@ -15,5 +15,45 @@ const require = createRequire(import.meta.url);
       }).code;
       expect(output).toBe("0.3m;");
     });
+
+    it("should support hack pipeline", () => {
+      const output = Babel.transform("x |> %", {
+        presets: [
+          [
+            "stage-1",
+            {
+              pipelineProposal: "hack",
+              decoratorsBeforeExport: true,
+            },
+          ],
+        ],
+      }).code;
+      expect(output).toMatchInlineSnapshot(`
+"var _ref;
+
+_ref = x, _ref;"
+`);
+    });
+
+    it("should support hack pipeline with `#` topic token", () => {
+      const output = Babel.transform("x |> #", {
+        presets: [
+          [
+            "stage-1",
+            {
+              pipelineProposal: "hack",
+              pipelineTopicToken: "#",
+              recordAndTupleSyntax: "bar",
+              decoratorsBeforeExport: true,
+            },
+          ],
+        ],
+      }).code;
+      expect(output).toMatchInlineSnapshot(`
+"var _ref;
+
+_ref = x, _ref;"
+`);
+    });
   },
 );