Babel: pass sourceFileName to the parser to populate the location filename

lib/parser.ts

@@ -31,6 +31,7 @@ export function parse(source: string, options?: Partial<Options>) {
     tolerant: util.getOption(options, "tolerant", true),
     ecmaVersion: 6,
     sourceType: util.getOption(options, "sourceType", "module"),
+    sourceFileName: util.getOption(options, "sourceFileName", null),
   });
 
   // Use ast.tokens if possible, and otherwise fall back to the Esprima

parsers/_babel_options.ts

@@ -4,6 +4,7 @@ import { getOption } from "../lib/util";
 export type Overrides = Partial<{
   sourceType: ParserOptions["sourceType"];
   strictMode: ParserOptions["strictMode"];
+  sourceFileName: string;
 }>;
 
 export default function getBabelOptions(
@@ -16,6 +17,7 @@ export default function getBabelOptions(
   return {
     sourceType: getOption(options, "sourceType", "module"),
     strictMode: getOption(options, "strictMode", false),
+    sourceFilename: getOption(options, "sourceFileName", undefined),
     allowImportExportEverywhere: true,
     allowReturnOutsideFunction: true,
     startLine: 1,

test/babel.ts

@@ -497,4 +497,15 @@ describe("Babel", function () {
 
     assert.strictEqual(recast.prettyPrint(ast).code, code.join(eol));
   });
+
+  it("adds the sourceFilename to location", function () {
+    const code = "const a = 1;";
+    const filename = "testfile.js";
+    const ast = recast.parse(code, {
+      ...parseOptions,
+      sourceFileName: filename,
+    });
+
+    assert.strictEqual(ast.program.body[0].loc.filename, filename);
+  });
 });