fix: Fix sourcemap file lookup

ember-cli · Oct 24, 2023 · a31c803 · a31c803
1 parent 8e5decf
commit a31c803
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Showing 6 changed files with 72 additions and 5 deletions.
diff --git a/lib/get-sourcemap-content.js b/lib/get-sourcemap-content.js
@@ -2,20 +2,24 @@
 
 const fs = require('fs');
 const path = require('path');
-const srcURL = require('source-map-url');
+const srcURL = require('./source-map-url');
 
 module.exports = function getSourceMapContent(src, inFileDirname, relativePath, silent) {
   let urls = [];
   let matchedUrl;
+  srcURL.reset();
   while ((matchedUrl = srcURL.getFrom(src)) !== null) {
     urls.push(matchedUrl);
-    src = srcURL.removeFrom(src);
   }
   if (urls.length) {
     for (let i = urls.length - 1; i >= 0; --i) {
       let sourceMapPath = path.join(inFileDirname, urls[i]);
       if (fs.existsSync(sourceMapPath)) {
-        return JSON.parse(fs.readFileSync(sourceMapPath));
+        try {
+          return JSON.parse(fs.readFileSync(sourceMapPath));
+        } catch (e) {
+          console.error('[ERROR] (broccoli-terser-sourcemap) failed to parse sourcemap file', sourceMapPath, e);
+        }
       }
     }
     if (!silent) {

diff --git a/lib/source-map-url.js b/lib/source-map-url.js
@@ -0,0 +1,18 @@
+'use strict';
+
+// Forked from https://github.com/lydell/source-map-url/blob/master/source-map-url.js
+// We use a slightly adjusted regex here
+const convertSourceMap = require('convert-source-map');
+
+module.exports = {
+  regex: convertSourceMap.mapFileCommentRegex,
+
+  reset() {
+    this.regex = convertSourceMap.mapFileCommentRegex;
+  },
+
+  getFrom(code) {
+    const m = this.regex.exec(code);
+    return m ? m[1] || m[2] : null;
+  },
+};
diff --git a/package.json b/package.json
@@ -38,10 +38,10 @@
   "dependencies": {
     "async-promise-queue": "^1.0.5",
     "broccoli-plugin": "^4.0.7",
+    "convert-source-map": "^2.0.0",
     "debug": "^4.3.1",
     "lodash.defaultsdeep": "^4.6.1",
     "matcher-collection": "^2.0.1",
-    "source-map-url": "^0.4.1",
     "symlink-or-copy": "^1.3.1",
     "terser": "^5.7.0",
     "walk-sync": "^2.2.0",

diff --git a/test/__snapshots__/test.js.snap b/test/__snapshots__/test.js.snap
@@ -16,6 +16,7 @@ Object {
     background: white;
 }",
   "with-broken-sourcemap.js": "function meaningOfLife(){throw new Error(42)}",
+  "with-sourcemap-like-string.js": "function createURL(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}function createURL2(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}",
 }
 `;
 
@@ -65,6 +66,9 @@ function third(){
   "with-broken-sourcemap.js": "function meaningOfLife(){throw new Error(42)}
 //# sourceMappingURL=with-broken-sourcemap.map",
   "with-broken-sourcemap.map": "{\\"version\\":3,\\"sources\\":[\\"with-broken-sourcemap.js\\"],\\"names\\":[\\"meaningOfLife\\",\\"Error\\"],\\"mappings\\":\\"AAAA,SAASA,gBAEP,MAAM,IAAIC,MADa\\",\\"file\\":\\"with-broken-sourcemap.js\\"}",
+  "with-sourcemap-like-string.js": "function createURL(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}function createURL2(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}
+//# sourceMappingURL=with-sourcemap-like-string.map",
+  "with-sourcemap-like-string.map": "{\\"version\\":3,\\"sources\\":[\\"with-sourcemap-like-string.js\\"],\\"names\\":[\\"createURL\\",\\"base64\\",\\"sourcemapArg\\",\\"enableUnicodeArg\\",\\"sourcemap\\",\\"undefined\\",\\"source\\",\\"decodeBase64\\",\\"start\\",\\"indexOf\\",\\"body\\",\\"substring\\",\\"blob\\",\\"Blob\\",\\"type\\",\\"URL\\",\\"createObjectURL\\",\\"createURL2\\"],\\"mappings\\":\\"AAAA,SAASA,UAAUC,EAAQC,EAAcC,GACrC,IAAIC,OAA6BC,IAAjBH,EAA6B,KAAOA,EAEhDI,EAASC,aAAaN,OADeI,IAArBF,GAAyCA,GAEzDK,EAAQF,EAAOG,QAAQ,KAAM,IAAM,EACnCC,EAAOJ,EAAOK,UAAUH,IAAUJ,EAAY,wBAA4BA,EAAY,IACtFQ,EAAO,IAAIC,KAAK,CAACH,GAAO,CAAEI,KAAM,2BACpC,OAAOC,IAAIC,gBAAgBJ,GAG/B,SAASK,WAAWhB,EAAQC,EAAcC,GACtC,IAAIC,OAA6BC,IAAjBH,EAA6B,KAAOA,EAEhDI,EAASC,aAAaN,OADeI,IAArBF,GAAyCA,GAEzDK,EAAQF,EAAOG,QAAQ,KAAM,IAAM,EACnCC,EAAOJ,EAAOK,UAAUH,IAAUJ,EAAY,wBAA0BA,EAAY,IACpFQ,EAAO,IAAIC,KAAK,CAACH,GAAO,CAAEI,KAAM,2BACpC,OAAOC,IAAIC,gBAAgBJ\\",\\"file\\":\\"with-sourcemap-like-string.js\\"}",
 }
 `;
 
@@ -102,6 +106,9 @@ Object {
   "with-broken-sourcemap.js": "function meaningOfLife(){throw new Error(42)}
 //# sourceMappingURL=with-broken-sourcemap.map",
   "with-broken-sourcemap.map": "{\\"version\\":3,\\"sources\\":[\\"with-broken-sourcemap.js\\"],\\"names\\":[\\"meaningOfLife\\",\\"Error\\"],\\"mappings\\":\\"AAAA,SAASA,gBAEP,MAAM,IAAIC,MADa\\",\\"file\\":\\"with-broken-sourcemap.js\\"}",
+  "with-sourcemap-like-string.js": "function createURL(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}function createURL2(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}
+//# sourceMappingURL=with-sourcemap-like-string.map",
+  "with-sourcemap-like-string.map": "{\\"version\\":3,\\"sources\\":[\\"with-sourcemap-like-string.js\\"],\\"names\\":[\\"createURL\\",\\"base64\\",\\"sourcemapArg\\",\\"enableUnicodeArg\\",\\"sourcemap\\",\\"undefined\\",\\"source\\",\\"decodeBase64\\",\\"start\\",\\"indexOf\\",\\"body\\",\\"substring\\",\\"blob\\",\\"Blob\\",\\"type\\",\\"URL\\",\\"createObjectURL\\",\\"createURL2\\"],\\"mappings\\":\\"AAAA,SAASA,UAAUC,EAAQC,EAAcC,GACrC,IAAIC,OAA6BC,IAAjBH,EAA6B,KAAOA,EAEhDI,EAASC,aAAaN,OADeI,IAArBF,GAAyCA,GAEzDK,EAAQF,EAAOG,QAAQ,KAAM,IAAM,EACnCC,EAAOJ,EAAOK,UAAUH,IAAUJ,EAAY,wBAA4BA,EAAY,IACtFQ,EAAO,IAAIC,KAAK,CAACH,GAAO,CAAEI,KAAM,2BACpC,OAAOC,IAAIC,gBAAgBJ,GAG/B,SAASK,WAAWhB,EAAQC,EAAcC,GACtC,IAAIC,OAA6BC,IAAjBH,EAA6B,KAAOA,EAEhDI,EAASC,aAAaN,OADeI,IAArBF,GAAyCA,GAEzDK,EAAQF,EAAOG,QAAQ,KAAM,IAAM,EACnCC,EAAOJ,EAAOK,UAAUH,IAAUJ,EAAY,wBAA0BA,EAAY,IACpFQ,EAAO,IAAIC,KAAK,CAACH,GAAO,CAAEI,KAAM,2BACpC,OAAOC,IAAIC,gBAAgBJ\\",\\"file\\":\\"with-sourcemap-like-string.js\\"}",
 }
 `;
 
@@ -131,6 +138,9 @@ Object {
   "with-broken-sourcemap.js": "function meaningOfLife(){throw new Error(42)}
 //# sourceMappingURL=with-broken-sourcemap.map",
   "with-broken-sourcemap.map": "{\\"version\\":3,\\"sources\\":[\\"with-broken-sourcemap.js\\"],\\"names\\":[\\"meaningOfLife\\",\\"Error\\"],\\"mappings\\":\\"AAAA,SAASA,gBAEP,MAAM,IAAIC,MADa\\",\\"file\\":\\"with-broken-sourcemap.js\\"}",
+  "with-sourcemap-like-string.js": "function createURL(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}function createURL2(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}
+//# sourceMappingURL=with-sourcemap-like-string.map",
+  "with-sourcemap-like-string.map": "{\\"version\\":3,\\"sources\\":[\\"with-sourcemap-like-string.js\\"],\\"names\\":[\\"createURL\\",\\"base64\\",\\"sourcemapArg\\",\\"enableUnicodeArg\\",\\"sourcemap\\",\\"undefined\\",\\"source\\",\\"decodeBase64\\",\\"start\\",\\"indexOf\\",\\"body\\",\\"substring\\",\\"blob\\",\\"Blob\\",\\"type\\",\\"URL\\",\\"createObjectURL\\",\\"createURL2\\"],\\"mappings\\":\\"AAAA,SAASA,UAAUC,EAAQC,EAAcC,GACrC,IAAIC,OAA6BC,IAAjBH,EAA6B,KAAOA,EAEhDI,EAASC,aAAaN,OADeI,IAArBF,GAAyCA,GAEzDK,EAAQF,EAAOG,QAAQ,KAAM,IAAM,EACnCC,EAAOJ,EAAOK,UAAUH,IAAUJ,EAAY,wBAA4BA,EAAY,IACtFQ,EAAO,IAAIC,KAAK,CAACH,GAAO,CAAEI,KAAM,2BACpC,OAAOC,IAAIC,gBAAgBJ,GAG/B,SAASK,WAAWhB,EAAQC,EAAcC,GACtC,IAAIC,OAA6BC,IAAjBH,EAA6B,KAAOA,EAEhDI,EAASC,aAAaN,OADeI,IAArBF,GAAyCA,GAEzDK,EAAQF,EAAOG,QAAQ,KAAM,IAAM,EACnCC,EAAOJ,EAAOK,UAAUH,IAAUJ,EAAY,wBAA0BA,EAAY,IACpFQ,EAAO,IAAIC,KAAK,CAACH,GAAO,CAAEI,KAAM,2BACpC,OAAOC,IAAIC,gBAAgBJ\\",\\"file\\":\\"with-sourcemap-like-string.js\\"}",
 }
 `;
 
@@ -164,6 +174,9 @@ Object {
   "with-broken-sourcemap.js": "function meaningOfLife(){throw new Error(42)}
 //# sourceMappingURL=with-broken-sourcemap.map",
   "with-broken-sourcemap.map": "{\\"version\\":3,\\"sources\\":[\\"with-broken-sourcemap.js\\"],\\"names\\":[\\"meaningOfLife\\",\\"Error\\"],\\"mappings\\":\\"AAAA,SAASA,gBAEP,MAAM,IAAIC,MADa\\",\\"file\\":\\"with-broken-sourcemap.js\\"}",
+  "with-sourcemap-like-string.js": "function createURL(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}function createURL2(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}
+//# sourceMappingURL=with-sourcemap-like-string.map",
+  "with-sourcemap-like-string.map": "{\\"version\\":3,\\"sources\\":[\\"with-sourcemap-like-string.js\\"],\\"names\\":[\\"createURL\\",\\"base64\\",\\"sourcemapArg\\",\\"enableUnicodeArg\\",\\"sourcemap\\",\\"undefined\\",\\"source\\",\\"decodeBase64\\",\\"start\\",\\"indexOf\\",\\"body\\",\\"substring\\",\\"blob\\",\\"Blob\\",\\"type\\",\\"URL\\",\\"createObjectURL\\",\\"createURL2\\"],\\"mappings\\":\\"AAAA,SAASA,UAAUC,EAAQC,EAAcC,GACrC,IAAIC,OAA6BC,IAAjBH,EAA6B,KAAOA,EAEhDI,EAASC,aAAaN,OADeI,IAArBF,GAAyCA,GAEzDK,EAAQF,EAAOG,QAAQ,KAAM,IAAM,EACnCC,EAAOJ,EAAOK,UAAUH,IAAUJ,EAAY,wBAA4BA,EAAY,IACtFQ,EAAO,IAAIC,KAAK,CAACH,GAAO,CAAEI,KAAM,2BACpC,OAAOC,IAAIC,gBAAgBJ,GAG/B,SAASK,WAAWhB,EAAQC,EAAcC,GACtC,IAAIC,OAA6BC,IAAjBH,EAA6B,KAAOA,EAEhDI,EAASC,aAAaN,OADeI,IAArBF,GAAyCA,GAEzDK,EAAQF,EAAOG,QAAQ,KAAM,IAAM,EACnCC,EAAOJ,EAAOK,UAAUH,IAAUJ,EAAY,wBAA0BA,EAAY,IACpFQ,EAAO,IAAIC,KAAK,CAACH,GAAO,CAAEI,KAAM,2BACpC,OAAOC,IAAIC,gBAAgBJ\\",\\"file\\":\\"with-sourcemap-like-string.js\\"}",
 }
 `;
 
@@ -178,6 +191,7 @@ Object {
     "no-upstream-sourcemap.map": "{\\"version\\":3,\\"sources\\":[\\"no-upstream-sourcemap.js\\"],\\"names\\":[\\"meaningOfLife\\",\\"Error\\",\\"boom\\",\\"somethingElse\\",\\"fourth\\",\\"third\\"],\\"mappings\\":\\"AACA,SAASA,gBAEP,MAAM,IAAIC,MADa,IAIzB,SAASC,OACP,MAAM,IAAID,MAAM,QAGlB,SAASE,gBACP,MAAM,IAAIF,MAAM,kBAMlB,SAASG,SACP,MAAM,IAAIH,MAAM,UAGlB,SAASI,QACP,MAAM,IAAIJ,MAAM\\",\\"file\\":\\"no-upstream-sourcemap.js\\"}",
     "with-broken-sourcemap.map": "{\\"version\\":3,\\"sources\\":[\\"with-broken-sourcemap.js\\"],\\"names\\":[\\"meaningOfLife\\",\\"Error\\"],\\"mappings\\":\\"AAAA,SAASA,gBAEP,MAAM,IAAIC,MADa\\",\\"file\\":\\"with-broken-sourcemap.js\\"}",
     "with-multi-sourcemap.map": "{\\"version\\":3,\\"sources\\":[\\"/inner/first.js\\",\\"/inner/second.js\\",\\"/other/fourth.js\\",\\"/other/third.js\\"],\\"names\\":[\\"meaningOfLife\\",\\"Error\\",\\"boom\\",\\"somethingElse\\",\\"fourth\\",\\"third\\"],\\"mappings\\":\\"AAAA,SAAAA,gBAEA,MAAA,IAAAC,MADA,IAIA,SAAAC,OACA,MAAA,IAAAD,MAAA,QCNA,SAAAE,gBACA,MAAA,IAAAF,MAAA,kBCEA,SAAAG,SACA,MAAA,IAAAH,MAAA,UCJA,SAAAI,QACA,MAAA,IAAAJ,MAAA\\",\\"file\\":\\"with-multi-sourcemap.js\\",\\"sourcesContent\\":[\\"function meaningOfLife() {\\\\n  var thisIsALongLocal = 42;\\\\n  throw new Error(thisIsALongLocal);\\\\n}\\\\n\\\\nfunction boom() {\\\\n  throw new Error('boom');\\\\n}\\\\n\\",\\"function somethingElse() {\\\\n  throw new Error(\\\\\\"somethign else\\\\\\");\\\\n}\\\\n\\",\\"\\\\n// Hello world\\\\n\\\\nfunction fourth(){\\\\n  throw new Error('fourth');\\\\n}\\\\n\\",\\"function third(){\\\\n  throw new Error(\\\\\\"oh no\\\\\\");\\\\n}\\\\n\\"]}",
+    "with-sourcemap-like-string.map": "{\\"version\\":3,\\"sources\\":[\\"with-sourcemap-like-string.js\\"],\\"names\\":[\\"createURL\\",\\"base64\\",\\"sourcemapArg\\",\\"enableUnicodeArg\\",\\"sourcemap\\",\\"undefined\\",\\"source\\",\\"decodeBase64\\",\\"start\\",\\"indexOf\\",\\"body\\",\\"substring\\",\\"blob\\",\\"Blob\\",\\"type\\",\\"URL\\",\\"createObjectURL\\",\\"createURL2\\"],\\"mappings\\":\\"AAAA,SAASA,UAAUC,EAAQC,EAAcC,GACrC,IAAIC,OAA6BC,IAAjBH,EAA6B,KAAOA,EAEhDI,EAASC,aAAaN,OADeI,IAArBF,GAAyCA,GAEzDK,EAAQF,EAAOG,QAAQ,KAAM,IAAM,EACnCC,EAAOJ,EAAOK,UAAUH,IAAUJ,EAAY,wBAA4BA,EAAY,IACtFQ,EAAO,IAAIC,KAAK,CAACH,GAAO,CAAEI,KAAM,2BACpC,OAAOC,IAAIC,gBAAgBJ,GAG/B,SAASK,WAAWhB,EAAQC,EAAcC,GACtC,IAAIC,OAA6BC,IAAjBH,EAA6B,KAAOA,EAEhDI,EAASC,aAAaN,OADeI,IAArBF,GAAyCA,GAEzDK,EAAQF,EAAOG,QAAQ,KAAM,IAAM,EACnCC,EAAOJ,EAAOK,UAAUH,IAAUJ,EAAY,wBAA0BA,EAAY,IACpFQ,EAAO,IAAIC,KAAK,CAACH,GAAO,CAAEI,KAAM,2BACpC,OAAOC,IAAIC,gBAAgBJ\\",\\"file\\":\\"with-sourcemap-like-string.js\\"}",
     "with-upstream-sourcemap.map": "{\\"version\\":3,\\"sources\\":[\\"/inner/first.js\\",\\"/inner/second.js\\",\\"/other/fourth.js\\",\\"/other/third.js\\"],\\"names\\":[\\"meaningOfLife\\",\\"Error\\",\\"boom\\",\\"somethingElse\\",\\"fourth\\",\\"third\\"],\\"mappings\\":\\"AAAA,SAAAA,gBAEA,MAAA,IAAAC,MADA,IAIA,SAAAC,OACA,MAAA,IAAAD,MAAA,QCNA,SAAAE,gBACA,MAAA,IAAAF,MAAA,kBCEA,SAAAG,SACA,MAAA,IAAAH,MAAA,UCJA,SAAAI,QACA,MAAA,IAAAJ,MAAA\\",\\"file\\":\\"with-upstream-sourcemap.js\\",\\"sourcesContent\\":[\\"function meaningOfLife() {\\\\n  var thisIsALongLocal = 42;\\\\n  throw new Error(thisIsALongLocal);\\\\n}\\\\n\\\\nfunction boom() {\\\\n  throw new Error('boom');\\\\n}\\\\n\\",\\"function somethingElse() {\\\\n  throw new Error(\\\\\\"somethign else\\\\\\");\\\\n}\\\\n\\",\\"\\\\n// Hello world\\\\n\\\\nfunction fourth(){\\\\n  throw new Error('fourth');\\\\n}\\\\n\\",\\"function third(){\\\\n  throw new Error(\\\\\\"oh no\\\\\\");\\\\n}\\\\n\\"]}",
   },
   "mjs": Object {
@@ -195,6 +209,8 @@ Object {
 }",
   "with-broken-sourcemap.js": "function meaningOfLife(){throw new Error(42)}
 //# sourceMappingURL=/maps/with-broken-sourcemap.map",
+  "with-sourcemap-like-string.js": "function createURL(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}function createURL2(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}
+//# sourceMappingURL=/maps/with-sourcemap-like-string.map",
 }
 `;
 
@@ -219,6 +235,8 @@ Object {
 }",
   "with-broken-sourcemap.js": "function meaningOfLife(){throw new Error(42)}",
   "with-broken-sourcemap.map": "{\\"version\\":3,\\"sources\\":[\\"with-broken-sourcemap.js\\"],\\"names\\":[\\"meaningOfLife\\",\\"Error\\"],\\"mappings\\":\\"AAAA,SAASA,gBAEP,MAAM,IAAIC,MADa\\",\\"file\\":\\"with-broken-sourcemap.js\\"}",
+  "with-sourcemap-like-string.js": "function createURL(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}function createURL2(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}",
+  "with-sourcemap-like-string.map": "{\\"version\\":3,\\"sources\\":[\\"with-sourcemap-like-string.js\\"],\\"names\\":[\\"createURL\\",\\"base64\\",\\"sourcemapArg\\",\\"enableUnicodeArg\\",\\"sourcemap\\",\\"undefined\\",\\"source\\",\\"decodeBase64\\",\\"start\\",\\"indexOf\\",\\"body\\",\\"substring\\",\\"blob\\",\\"Blob\\",\\"type\\",\\"URL\\",\\"createObjectURL\\",\\"createURL2\\"],\\"mappings\\":\\"AAAA,SAASA,UAAUC,EAAQC,EAAcC,GACrC,IAAIC,OAA6BC,IAAjBH,EAA6B,KAAOA,EAEhDI,EAASC,aAAaN,OADeI,IAArBF,GAAyCA,GAEzDK,EAAQF,EAAOG,QAAQ,KAAM,IAAM,EACnCC,EAAOJ,EAAOK,UAAUH,IAAUJ,EAAY,wBAA4BA,EAAY,IACtFQ,EAAO,IAAIC,KAAK,CAACH,GAAO,CAAEI,KAAM,2BACpC,OAAOC,IAAIC,gBAAgBJ,GAG/B,SAASK,WAAWhB,EAAQC,EAAcC,GACtC,IAAIC,OAA6BC,IAAjBH,EAA6B,KAAOA,EAEhDI,EAASC,aAAaN,OADeI,IAArBF,GAAyCA,GAEzDK,EAAQF,EAAOG,QAAQ,KAAM,IAAM,EACnCC,EAAOJ,EAAOK,UAAUH,IAAUJ,EAAY,wBAA0BA,EAAY,IACpFQ,EAAO,IAAIC,KAAK,CAACH,GAAO,CAAEI,KAAM,2BACpC,OAAOC,IAAIC,gBAAgBJ\\",\\"file\\":\\"with-sourcemap-like-string.js\\"}",
 }
 `;
 
@@ -248,5 +266,8 @@ Object {
   "with-broken-sourcemap.js": "function meaningOfLife(){throw new Error(42)}
 //# sourceMappingURL=https://example.com/with-broken-sourcemap.map",
   "with-broken-sourcemap.map": "{\\"version\\":3,\\"sources\\":[\\"with-broken-sourcemap.js\\"],\\"names\\":[\\"meaningOfLife\\",\\"Error\\"],\\"mappings\\":\\"AAAA,SAASA,gBAEP,MAAM,IAAIC,MADa\\",\\"file\\":\\"with-broken-sourcemap.js\\"}",
+  "with-sourcemap-like-string.js": "function createURL(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}function createURL2(e,n,a){var i=void 0===n?null:n,t=decodeBase64(e,void 0!==a&&a),c=t.indexOf(\\"\\\\n\\",10)+1,r=t.substring(c)+(i?\\"//# sourceMappingURL=\\"+i:\\"\\"),o=new Blob([r],{type:\\"application/javascript\\"});return URL.createObjectURL(o)}
+//# sourceMappingURL=https://example.com/with-sourcemap-like-string.map",
+  "with-sourcemap-like-string.map": "{\\"version\\":3,\\"sources\\":[\\"with-sourcemap-like-string.js\\"],\\"names\\":[\\"createURL\\",\\"base64\\",\\"sourcemapArg\\",\\"enableUnicodeArg\\",\\"sourcemap\\",\\"undefined\\",\\"source\\",\\"decodeBase64\\",\\"start\\",\\"indexOf\\",\\"body\\",\\"substring\\",\\"blob\\",\\"Blob\\",\\"type\\",\\"URL\\",\\"createObjectURL\\",\\"createURL2\\"],\\"mappings\\":\\"AAAA,SAASA,UAAUC,EAAQC,EAAcC,GACrC,IAAIC,OAA6BC,IAAjBH,EAA6B,KAAOA,EAEhDI,EAASC,aAAaN,OADeI,IAArBF,GAAyCA,GAEzDK,EAAQF,EAAOG,QAAQ,KAAM,IAAM,EACnCC,EAAOJ,EAAOK,UAAUH,IAAUJ,EAAY,wBAA4BA,EAAY,IACtFQ,EAAO,IAAIC,KAAK,CAACH,GAAO,CAAEI,KAAM,2BACpC,OAAOC,IAAIC,gBAAgBJ,GAG/B,SAASK,WAAWhB,EAAQC,EAAcC,GACtC,IAAIC,OAA6BC,IAAjBH,EAA6B,KAAOA,EAEhDI,EAASC,aAAaN,OADeI,IAArBF,GAAyCA,GAEzDK,EAAQF,EAAOG,QAAQ,KAAM,IAAM,EACnCC,EAAOJ,EAAOK,UAAUH,IAAUJ,EAAY,wBAA0BA,EAAY,IACpFQ,EAAO,IAAIC,KAAK,CAACH,GAAO,CAAEI,KAAM,2BACpC,OAAOC,IAAIC,gBAAgBJ\\",\\"file\\":\\"with-sourcemap-like-string.js\\"}",
 }
 `;
diff --git a/test/fixtures/with-sourcemap-like-string.js b/test/fixtures/with-sourcemap-like-string.js
@@ -0,0 +1,19 @@
+function createURL(base64, sourcemapArg, enableUnicodeArg) {
+    var sourcemap = sourcemapArg === undefined ? null : sourcemapArg;
+    var enableUnicode = enableUnicodeArg === undefined ? false : enableUnicodeArg;
+    var source = decodeBase64(base64, enableUnicode);
+    var start = source.indexOf('\n', 10) + 1;
+    var body = source.substring(start) + (sourcemap ? '\/\/# sourceMappingURL=' + sourcemap : '');
+    var blob = new Blob([body], { type: 'application/javascript' });
+    return URL.createObjectURL(blob);
+}
+
+function createURL2(base64, sourcemapArg, enableUnicodeArg) {
+    var sourcemap = sourcemapArg === undefined ? null : sourcemapArg;
+    var enableUnicode = enableUnicodeArg === undefined ? false : enableUnicodeArg;
+    var source = decodeBase64(base64, enableUnicode);
+    var start = source.indexOf('\n', 10) + 1;
+    var body = source.substring(start) + (sourcemap ? '//# sourceMappingURL=' + sourcemap : '');
+    var blob = new Blob([body], { type: 'application/javascript' });
+    return URL.createObjectURL(blob);
+}