False positives (REGEX) in SourcemappingUrlProcessor when having ".map" in path

[jose-miguel-cruz]

We have a JS asset that contains some generic polyfills from @babel/polyfill

From this Sprockets v3.4.0 update, our application stopped working

We found the issue occurs when we use source-maps for specific functions that have .map in the path like "../node_modules/core-js/modules/es6.array.map.js"

Original code:

/***/ "../node_modules/@babel/polyfill/node_modules/core-js/modules/es6.array.map.js":
/*!*************************************************************************************!*\
  !*** ../node_modules/@babel/polyfill/node_modules/core-js/modules/es6.array.map.js ***!
  \*************************************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

"use strict";
eval("\nvar $export = __webpack_require__(/*! ./_export */ \"../node_modules/@babel/polyfill/node_modules/core-js/modules/_export.js\");\nvar $map = __webpack_require__(/*! ./_array-methods */ \"../node_modules/@babel/polyfill/node_modules/core-js/modules/_array-methods.js\")(1);\n\n$export($export.P + $export.F * !__webpack_require__(/*! ./_strict-method */ \"../node_modules/@babel/polyfill/node_modules/core-js/modules/_strict-method.js\")([].map, true), 'Array', {\n  // 22.1.3.15 / 15.4.4.19 Array.prototype.map(callbackfn [, thisArg])\n  map: function map(callbackfn /* , thisArg */) {\n    return $map(this, callbackfn, arguments[1]);\n  }\n});\n//# sourceURL=[module]\n//# sourceMappingURL=data:application/json;charset=utf-8;base64,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\n//# sourceURL=webpack-internal:///../node_modules/@babel/polyfill/node_modules/core-js/modules/es6.array.map.js\n");

/***/ }),

Using this REGEX \/\/# sourceMappingURL=(.*\.map) then generates false positives:

And finally will lead to an output like this, which will make the application crash:

(From: <application_path>/assets/application.js)

[arunrao86]

@jose-miguel-cruz ,Was there any workaround for this? Even in the latest version 3.4.2, this issue is still present.

[miguel-101]

@arunrao86, unfortunately, no, we had to pin to version 3.3.0