Webpack Module Warning: Failed to parse source map from "data" URL

Question

I'm receiving a bummer warning and have been unable to find an available solution:

WARNING in ../lensing/dist/main.js
Module Warning (from ./node_modules/source-map-loader/dist/cjs.js):
Failed to parse source map from "data" URL: data:application/json;charset=utf-8;base64,eyJ2ZXJza [...]

My webpack.config.js looks like (setup for npm module):

module.exports = {
    entry: './src/index.js',
    output: {
        filename: 'main.js',
        path: path.resolve(__dirname, 'dist'),
        library: 'lensing',
        libraryTarget: 'umd',
        umdNamedDefine: true
    },
    module: {
        rules: [
            {
                test: /\.m?js$/,
                exclude: /(node_modules|bower_components)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['@babel/preset-env'],
                        plugins: [
                            '@babel/plugin-proposal-class-properties'
                        ]
                    }
                }
            },
            {
                test: /\.js$/,
                enforce: 'pre',
                use: ['source-map-loader'],
            },
            {
                test: /\.(png|jpg|gif|svg)$/i,
                use: [
                    {
                        loader: 'url-loader',
                        options: {
                            limit: 8192,
                        },
                    },
                ],
            }
        ]
    },
    stats: {
        warningsFilter: [/Failed to parse source map/],
    },
};

I've been surprised not to find much else on this specific issue and am worried that I've missed something that is typically straightforward. I am happy to include any other code snippets that might be helpful but am hoping that the error code might be a strong indiator.

Any advice would be warmly welcomed!

EDIT - more context:

Version: webpack 4.43.0
Time: 6561ms
Built at: 07/31/2020 11:20:55 AM
                               Asset       Size  Chunks             Chunk Names
aafa1b05e4b76ffd04c1fe92edbf15f2.svg  654 bytes          [emitted]  
                             main.js    3.6 MiB    main  [emitted]  main
Entrypoint main = main.js
[0] multi (webpack)-dev-server/client?http://localhost:9000 ./src/index.js 40 bytes {main} [built]
[../lensing/dist/main.js] 2.46 MiB {main} [built] [1 warning]
[./node_modules/openseadragon/build/openseadragon/openseadragon.js] 674 KiB {main} [built]
[./node_modules/webpack-dev-server/client/index.js?http://localhost:9000] (webpack)-dev-server/client?http://localhost:9000 4.29 KiB {main} [built]
[./node_modules/webpack-dev-server/client/overlay.js] (webpack)-dev-server/client/overlay.js 3.51 KiB {main} [built]
[./node_modules/webpack-dev-server/client/socket.js] (webpack)-dev-server/client/socket.js 1.53 KiB {main} [built]
[./node_modules/webpack-dev-server/client/utils/createSocketUrl.js] (webpack)-dev-server/client/utils/createSocketUrl.js 2.91 KiB {main} [built]
[./node_modules/webpack-dev-server/client/utils/log.js] (webpack)-dev-server/client/utils/log.js 964 bytes {main} [built]
[./node_modules/webpack-dev-server/client/utils/reloadApp.js] (webpack)-dev-server/client/utils/reloadApp.js 1.59 KiB {main} [built]
[./node_modules/webpack-dev-server/client/utils/sendMessage.js] (webpack)-dev-server/client/utils/sendMessage.js 402 bytes {main} [built]
[./node_modules/webpack-dev-server/node_modules/strip-ansi/index.js] (webpack)-dev-server/node_modules/strip-ansi/index.js 162 bytes {main} [built]
[./node_modules/webpack/hot sync ^\.\/log$] (webpack)/hot sync nonrecursive ^\.\/log$ 170 bytes {main} [built]
[./src/PIA23533_index32.csv] 622 bytes {main} [built]
[./src/index.css] 519 bytes {main} [built]
[./src/index.js] 1.69 KiB {main} [built]
    + 27 hidden modules

WARNING in ../lensing/dist/main.js
Module Warning (from ./node_modules/source-map-loader/dist/cjs.js):
Failed to parse source map from "data" URL: data:application/json;charset=utf-8;base64,{"version":3,"file":"./src/viewfinder.js.js","sources":["webpack://lensing/./src/viewfinder.js?b5ef"],"sourcesContent":["import * as d3 from 'd3';\n\n/**\n * @class Viewfinder\n */\nexport default class Viewfinder {\n\n    // Class refs\n    lensing = null;\n\n    // Data\n    data = null;\n    on = false;\n\n    // Elements\n    els = {\n        dataPointG: null,\n        g: null,\n        radialG: null,\n        svg: null,\n        boxG: null\n    };\n\n    // Configs\n    configs = {\n        boxW: 150,\n        boxH: 50,\n        deg: 0,\n        extend: 200,\n        gMargin: {top: 0, left: 0, right: 0, bottom: 0},\n        gH: 0,\n        gW: 0,\n        h: 0,\n        r: 0,\n        rPointer: 0,\n        rPointerExt: 25,\n        w: 0,\n    };\n\n    // Tools - TODO add boxScale to trace perimeter\n    tools = {\n        coordScale: d3.scaleLinear()\n            .domain([0, 360])\n            .range([Math.PI, -Math.PI]),\n        lineMaker: d3.line(),\n        xScale: d3.scaleLinear(),\n        yScale: d3.scaleLinear()\n    }\n\n    /*\n    Constructor\n     */\n    constructor(_lensing) {\n        // Fields\n        this.lensing = _lensing;\n\n        // Init\n        this.init();\n    }\n\n    /**\n     * 1.\n     * @function init\n     *\n     */\n    init() {\n        // Define this\n        const vis = this;\n\n        // Build svg, g\n        vis.els.svg = d3.select(vis.lensing.overlay.container)\n            .append('svg');\n        vis.els.g = vis.els.svg.append('g')\n            .attr('class', 'viewfinder_g')\n            .style('transform', `translate(${vis.configs.gMargin.top}px, ${vis.configs.gMargin.left}px)`);\n\n        // Attach component g's\n        vis.els.radialG = vis.els.g.append('g')\n            .attr('class', 'viewfinder_radial_g');\n        vis.els.dataPointG = vis.els.radialG.append('g')\n            .attr('class', 'viewfinder_data_point_g');\n        vis.els.dataPointG.append('path')\n            .attr('fill', 'none')\n            .attr('stroke', 'rgba(255, 255, 255, 1)')\n            .style('transform', 'translate3d(0, 0, 0)');\n        vis.els.boxG = vis.els.dataPointG.append('g')\n            .attr('class', 'viewfinder_box_g')\n            .style('transform', 'translate3d(0, 0, 0)')\n            .style('visibility', 'hidden');\n        vis.els.boxG.append('rect')\n            .attr('width', vis.configs.boxW)\n            .attr('height', vis.configs.boxH)\n            .attr('fill', 'none')\n            .attr('stroke', 'rgba(255, 255, 255, 1)')\n            .attr('stroke-width', '0.5px');\n        vis.els.boxG.append('text')\n            .attr('class', 'viewfinder_box_text viewfinder_box_text_a')\n            .attr('fill', 'white')\n            .attr('x', `${vis.configs.boxW / 2}px`)\n            .attr('y', `${Math.round(vis.configs.boxH / 3)}px`)\n            .attr('text-anchor', 'middle')\n            .attr('alignment-baseline', 'middle')\n            .style('font-family', 'sans-serif')\n            .style('font-size', '12px')\n            .style('font-weight', 'lighter');\n        vis.els.boxG.append('text')\n            .attr('class', 'viewfinder_box_text viewfinder_box_text_b')\n            .attr('fill', 'white')\n            .attr('x', `${vis.configs.boxW / 2}px`)\n            .attr('y', `${Math.round(vis.configs.boxH * 2 / 3)}px`)\n            .attr('text-anchor', 'middle')\n            .attr('alignment-baseline', 'middle')\n            .style('font-family', 'sans-serif')\n            .style('font-size', '11px')\n            .style('font-style', 'italic')\n            .style('font-weight', 'lighter');\n\n    }\n\n    /**\n     * @function wrangle\n     *\n     */\n    wrangle() {\n        // Define this\n        const vis = this;\n\n        // Update data\n        vis.data = this.lensing.configs.pxData;\n\n        // Update configs\n        vis.configs.r = vis.lensing.configs.rad / vis.lensing.configs.pxRatio;\n        vis.configs.rPointer = vis.configs.r + vis.configs.rPointerExt;\n        vis.configs.w = vis.configs.h = (vis.configs.r + vis.configs.extend) * 2;\n        vis.configs.gW = vis.configs.w - (vis.configs.gMargin.right + vis.configs.gMargin.left);\n        vis.configs.gH = vis.configs.h - (vis.configs.gMargin.top + vis.configs.gMargin.bottom);\n\n        // Check coordinate position\n        const x = this.lensing.configs.pos[0] / vis.lensing.configs.pxRatio - this.lensing.viewer.canvas.clientWidth / 2;\n        const y = this.lensing.configs.pos[1] / vis.lensing.configs.pxRatio - this.lensing.viewer.canvas.clientHeight / 2;\n        vis.deg = Math.atan2(y, x) * (180 / Math.PI);\n\n        // Update tools\n        vis.tools.xScale\n            .domain([-vis.configs.rPointer, vis.configs.rPointer])\n            .range([-vis.configs.boxW, 0]);\n        vis.tools.yScale\n            .domain([-vis.configs.rPointer, vis.configs.rPointer])\n            .range([-vis.configs.boxH, 0]);\n\n        // Render\n        vis.render();\n    }\n\n    /**\n     * @function render\n     *\n     */\n    render() {\n        // Define this\n        const vis = this;\n\n        if (vis.on) {\n\n            // Update svg, g\n            vis.els.svg.attr('width', vis.configs.w)\n                .attr('height', vis.configs.h)\n                .attr('style', `position: absolute; left: ${-vis.configs.extend}px; top: ${-vis.configs.extend}px;`)\n\n            // Update radialG\n            vis.els.radialG.style('transform', `translate(${vis.configs.gW / 2}px, ${vis.configs.gH / 2}px)`)\n\n            // Update dataPointG\n            vis.els.dataPointG\n                .datum(vis.data)\n                .each(function (d) {\n                    const g = d3.select(this);\n\n                    // Pointer coords\n                    const pCoords = getCoords(vis.configs.rPointer, vis.deg - 90);\n                    const addX = Math.round(vis.tools.xScale(pCoords[0]));\n                    const addY = Math.round(vis.tools.yScale(pCoords[1]));\n\n                    // Update path\n                    g.select('path')\n                        .attr('d', vis.tools.lineMaker([[0, 0], pCoords]));\n\n                    // Update boxG visibility, pos\n                    vis.els.boxG.style('visibility', 'visible');\n                    vis.els.boxG.style('transform', `translate(${pCoords[0] + addX}px, ${pCoords[1] + addY}px)`);\n                });\n\n            /* getCoords */\n            function getCoords(r, i) {\n                const x = Math.round(r * Math.sin(vis.tools.coordScale(i)));\n                const y = Math.round(r * Math.cos(vis.tools.coordScale(i)));\n                return [x, y];\n            }\n        } else {\n\n            // Hide\n            vis.els.boxG.style('visibility', 'hidden');\n        }\n\n    }\n\n    /**\n     * @function update_box_text\n     * Updates the text from data\n     *\n     * @param {Object} d\n     *\n     */\n    update_box_test(d) {\n        // Define this\n        const vis = this;\n\n        // Update\n        vis.els.boxG.select('.viewfinder_box_text_a')\n            .text(`Color Index #${d.index}`);\n        vis.els.boxG.select('.viewfinder_box_text_b')\n            .text(`rgb(${d.r}, ${d.g}, ${d.b})`);\n    }\n\n\n}"],"mappings":";;;;;;;;;;;AAAA;AAEA;;;;AAGA;AAEA;AAGA;AAIA;AASA;AAgBA;AACA;AASA;;;AAGA;AAAA;AACA;AADA;AACA;AADA;AACA;AADA;AACA;AADA;AApCA;AACA;AACA;AACA;AACA;AALA;AACA;AAoCA;AA3BA;AACA;AACA;AACA;AACA;AAAA;AAAA;AAAA;AAAA;AAAA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AAZA;AACA;AA2BA;AAXA;AAGA;AACA;AACA;AANA;AACA;AAYA;AACA;AACA;AAEA;AACA;AAEA;;;;;;;;;AAKA;AACA;AACA;AACA;AAEA;AAEA;AACA;AAIA;AAEA;AAEA;AAIA;AAIA;AAMA;AAUA;AAYA;AAEA;;;;;;;AAIA;AACA;AACA;AACA;AAEA;AACA;AAEA;AACA;AACA;AACA;AACA;AACA;AAEA;AACA;AACA;AACA;AAEA;AAGA;AACA;AAIA;AACA;AAEA;;;;;;;AAIA;AACA;AACA;AACA;AACA;AA8BA;AA9BA;AAgCA;AACA;AACA;AACA;AACA;AAlCA;AACA;AACA;AAIA;AACA;AAEA;AAGA;AACA;AAEA;AACA;AACA;AACA;AAEA;AACA;AAGA;AACA;AACA;AAQA;AAEA;AACA;AACA;AAEA;AAEA;;;;;;;;;;AAOA;AACA;AACA;AACA;AAEA;AAEA;AAEA;;;;;;","sourceRoot":""}\n//#
 @ ./src/index.js 3:0-29 65:19-30

Thanks @henokg - seeing it in both places (w webpack dev server and in Chrome console). Any thoughts? EDIT - more specifically it is linked (w npm link) to a demo using webpack (so I am seeing the error in the demo). — jared jessup, Jul 31 '20 at 16:50
can you post more of the error? can't seem to make anything of this alone and can you post it from the dev server console and not the browser one\ — henok, Jul 31 '20 at 17:04
Thanks - I've just done. As a sort of fix I removed the source-map-parser and the warning disappeared. Is it possible this issue happened because a webpack watch package was linked to a webpack watch application? — jared jessup, Jul 31 '20 at 17:14
good thing it worked, i thought the issue was related to performance or size limitation — henok, Jul 31 '20 at 17:15

Roger Perez · Answer 1 · 2022-11-18T21:34:06.253

39

If you're experiencing this issue with react-scripts/cra version 5.0.0. You'll need to add the following to your .env file

NOTE: this is not a fix. You are suppressing the source map warnings, but it may get you from seeing those warnings since all other solutions have not worked.

GENERATE_SOURCEMAP=false

or you can update your script to

"start": "GENERATE_SOURCEMAP=false react-scripts start",

Note: this is a temporary patch until 5.0.1 is released. See create-react-app repo pull request Update: 5.0.1 was release on April 2022. Changelog. The update did not fix this issue. Not sure when that will be ‍♂️

edited Nov 18 '22 at 21:34

answered Feb 03 '22 at 17:40

Roger Perez

2,807
29
31

8

uhm source maps have a purpose and not generating them will break many development flows – Ulysse Mizrahi Feb 04 '22 at 10:28
2

Well aware of it but instead of getting 200+ warnings I can't fix at this moment this is a fair alternate patch until `5.0.1` gets release – Roger Perez Feb 04 '22 at 18:14

score 27 · Answer 2 · answered Jun 24 '21 at 15:45

A better way. The following keeps source maps, and just removes the spam warning. From the docs

module.exports = {
  module: {
    rules: [
      {
        test: /\.js$/,
        enforce: "pre",
        use: ["source-map-loader"],
      },
    ],
  },
  ignoreWarnings: [/Failed to parse source map/],
};

score 12 · Answer 3 · answered Sep 23 '20 at 19:59

I have the same problem.

This isn't a solution, but a better workaround than the other "answer":

change your webpack.config.js module.rules setting for source-map-loader to this:

//module.rules:[
            {
                    test: /\.js$/,
                    enforce: 'pre',
                    use: [
                        {
                            //needed to chain sourcemaps.  see: https://webpack.js.org/loaders/source-map-loader/
                            loader: 'source-map-loader',
                            options: {

                                filterSourceMappingUrl: (url, resourcePath) => {
                                    //  console.log({ url, resourcePath }) example:
                                    // {
                                    //  url: 'index.js.map',
                                    //  resourcePath: '/repos/xlib-wsl/common/temp/node_modules/.pnpm/https-proxy-agent@5.0.0/node_modules/https-proxy-agent/dist/index.js'
                                    // }

                                    if (/.*\/node_modules\/.*/.test(resourcePath)) {
                                        return false
                                    }
                                    return true
                                }

                            }
                        }],
                },

That is, don't load sourcemaps for your node_module dependencies.

Why is it better than using the `exclude` property? Seems to do the same through more complex JS code. — Jérôme Beau, May 25 '21 at 09:38
The selected answer clearly stated, "if you are using react-scripts/cra" which implies you cannot access the webpack config. — tonnoz, Dec 20 '22 at 21:14

score 10 · Answer 4 · edited May 25 '21 at 09:32

10

{
    test: [/\.js?$/, /\.ts?$/, /\.jsx?$/, /\.tsx?$/],
    enforce: 'pre',
    exclude: /node_modules/,
    use: ['source-map-loader'],
},

include this into config file and download the source-map-loader as a dev-dependency

edited May 25 '21 at 09:32

Jérôme Beau

10,608
5
48
52

answered May 14 '21 at 20:53

Feras Ziyad

101
1
4

1

Excluding `node_modules` from source maps is indeed a workaround (if you're not interested in debugging down to the libs), but `source-map-loader` can only handle `js` files. – Jérôme Beau May 25 '21 at 09:34

score 7 · Answer 5 · answered Jan 16 '22 at 02:59

Adding to the solutions above, when using create-react-app having added react-app-rewired and customize-cra you can also get rid of the source map warnings updating config-overrides.js and setting ignoreWarnings

const { override } = require("customize-cra");

const ignoreWarnings = value => config => {
  config.ignoreWarnings = value;
  return config;
};

module.exports = override(
  ignoreWarnings([/Failed to parse source map/])
);

score 5 · Answer 6 · answered Jul 08 '22 at 11:57

Extending FrozenKiwi's answer for Craco

// craco.config.js
module.exports = {
    reactScriptsVersion: "react-scripts" /* (default value) */,
    webpack: {
        mode: 'extends',
        configure: {
            module: {
                rules: [
                    {
                        test: /\.js$/,
                        enforce: "pre",
                        use: ["source-map-loader"],
                    },
                ],
            },
            ignoreWarnings: [/Failed to parse source map/],
        },
    },
}

score 0 · Answer 7 · answered Jul 31 '20 at 18:48

Why the warning?

I was running webpack on an npm package in watch mode and testing it on a demo app that was also using webpack in watch mode by using npm link [package-name].

Workaround for dev:

Remove source-map-loader from the webpack.config.js in your demo.

score 0 · Answer 8 · answered Feb 03 '23 at 01:26

I was having the same warning in the console when working on a project created with create-react-app and the following solution worked for me.

I replaced the @remix-run folder in node_modules with the same folder from a different CRA project which was running without this warning and the warning disappeared.

score 0 · Answer 9 · answered May 24 '23 at 09:33

The best solution is to create a 'config-overrides.js' file on your root directory.the add below code:

const webpack = require('webpack');

module.exports = function override(config) {

    config.ignoreWarnings = [/Failed to parse source map/];
    const fallback = config.resolve.fallback || {};
    Object.assign(fallback, {
        "crypto": require.resolve("crypto-browserify"),
        "stream": require.resolve("stream-browserify"),
        "assert": require.resolve("assert"),
        "http": require.resolve("stream-http"),
        "https": require.resolve("https-browserify"),
        "os": require.resolve("os-browserify"),
        "url": require.resolve("url")
    })

    config.resolve.fallback = fallback;
    config.plugins = (config.plugins || []).concat([
        new webpack.ProvidePlugin({
            process: 'process/browser',
            Buffer: ['buffer', 'Buffer']
        })
    ])
    return config;
}

after that install dev npm packages for webpack

npm i -D crypto-browserify stream-browserify assert stream-http https-browserify os-browserify url

and finally you need to change your package.json start and build

 "scripts": {
    "start": "react-app-rewired start",
    "build": "react-app-rewired build",
  },

score -1 · Answer 10 · answered Nov 16 '22 at 20:46

-1

faced same issue, i think your api is not being called becuase of cors issue

answered Nov 16 '22 at 20:46

Amjad awan

1

As it’s currently written, your answer is unclear. Please [edit] to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Nov 18 '22 at 18:42

maxim.saharov · Answer 11 · 2022-06-30T08:19:50.433

-3

This solution helps me in create-react-app.

You can add this fix by editing the file node_modules/react-scripts/config/webpack.config.js, and pasting this after the line performance: false,

ignoreWarnings: [
  // Ignore warnings raised by source-map-loader.
  // some third party packages may ship miss-configured sourcemaps, that interrupts the build
  // See: https://github.com/facebook/create-react-app/discussions/11278#discussioncomment-1780169
  /**
   *
   * @param {import('webpack').WebpackError} warning
   * @returns {boolean}
   */
  function ignoreSourcemapsloaderWarnings(warning) {
    return (
      warning.module &&
      warning.module.resource.includes('node_modules') &&
      warning.details &&
      warning.details.includes('source-map-loader')
    );
  },
],

But when you make yarn install or npm install, yours edits will be deleted.

edited Jun 30 '22 at 08:19

answered Jun 30 '22 at 07:49

maxim.saharov

67
7

2

Its bad practice to edit anything in node_modules – Matt Nienow Jul 05 '22 at 14:23
@Matt Nienow I know it, but at now l don't know better solution in create-react-app. If you know better solution - write please! In my incident it happens after add antd 4.21 – maxim.saharov Jul 05 '22 at 17:54
@maxim.saharov you can use either [craco](https://www.npmjs.com/package/@craco/craco) or [customize-cra](https://www.npmjs.com/package/customize-cra). – igor.js May 09 '23 at 01:17

Webpack Module Warning: Failed to parse source map from "data" URL

11 Answers11

Linked