From dd776da1e525b15b98eb716e78d2b348a871cac5 Mon Sep 17 00:00:00 2001
From: liuxingbaoyu <30521560+liuxingbaoyu@users.noreply.github.com>
Date: Tue, 21 Feb 2023 06:34:42 +0800
Subject: [PATCH] fix: Handling source maps without `sourcesContent` (#15445)

* fix

* improve
---
 packages/babel-generator/src/source-map.ts |  2 +-
 packages/babel-generator/test/index.js     | 34 ++++++++++++++++++++++
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/packages/babel-generator/src/source-map.ts b/packages/babel-generator/src/source-map.ts
index 634b41fb60e0..fa27a87cfa58 100644
--- a/packages/babel-generator/src/source-map.ts
+++ b/packages/babel-generator/src/source-map.ts
@@ -58,7 +58,7 @@ export default class SourceMap {
           setSourceContent(
             map,
             resolvedSources[i],
-            this._inputMap.sourcesContent[i],
+            this._inputMap.sourcesContent?.[i],
           );
         }
       }
diff --git a/packages/babel-generator/test/index.js b/packages/babel-generator/test/index.js
index ab84ce99ed86..b5816f24b710 100644
--- a/packages/babel-generator/test/index.js
+++ b/packages/babel-generator/test/index.js
@@ -880,6 +880,40 @@ describe("generation", function () {
       });"
     `);
   });
+
+  it("inputSourceMap without sourcesContent", () => {
+    const ast = parse("var t = x => x * x;");
+
+    expect(
+      generate(ast, {
+        sourceMaps: true,
+        inputSourceMap: {
+          version: 3,
+          names: ["t", "x"],
+          sources: ["source-maps/arrow-function/input.js"],
+          mappings:
+            "AAAA,IAAIA,CAAC,GAAG,SAAJA,CAACA,CAAGC,CAAC;EAAA,OAAIA,CAAC,GAAGA,CAAC;AAAA",
+        },
+      }).map,
+    ).toMatchInlineSnapshot(`
+      Object {
+        "file": undefined,
+        "mappings": "AAAA,IAAIA,CAAC,GAAGC,CAAA,IAAAA,CAAA,GAAJA,CAAC",
+        "names": Array [
+          "t",
+          "x",
+        ],
+        "sourceRoot": undefined,
+        "sources": Array [
+          "source-maps/arrow-function/input.js",
+        ],
+        "sourcesContent": Array [
+          undefined,
+        ],
+        "version": 3,
+      }
+    `);
+  });
 });
 
 describe("programmatic generation", function () {