Angular 5 : ng build - -prod fails due to clean-css : Cannot read property 'line' of undefined

My app is under Angular 5.2.6

things are normal with ng serve

But when running : ng build --prod , it takes a while , before failing

The errors seems to with the clean-css actions :

Error trace:

 92% chunk asset optimization/home/khalidvm/Desktop/Workspace/Front/frontend_v2/node_modules/clean-css/lib/reader/input-source-map-tracker.js:37
  if (originalPosition.line === null && line > 1 && selectorFallbacks > 0) {
                      ^

TypeError: Cannot read property 'line' of undefined
    at originalPositionFor (/home/khalidvm/Desktop/Workspace/Front/frontend_v2/node_modules/clean-css/lib/reader/input-source-map-tracker.js:37:23)
    at originalMetadata (/home/khalidvm/Desktop/Workspace/Front/frontend_v2/node_modules/clean-css/lib/tokenizer/tokenize.js:486:43)
    at intoTokens (/home/khalidvm/Desktop/Workspace/Front/frontend_v2/node_modules/clean-css/lib/tokenizer/tokenize.js:240:75)
    at tokenize (/home/khalidvm/Desktop/Workspace/Front/frontend_v2/node_modules/clean-css/lib/tokenizer/tokenize.js:74:10)
    at fromStyles (/home/khalidvm/Desktop/Workspace/Front/frontend_v2/node_modules/clean-css/lib/reader/read-sources.js:147:12)
    at fromString (/home/khalidvm/Desktop/Workspace/Front/frontend_v2/node_modules/clean-css/lib/reader/read-sources.js:48:10)
    at doReadSources (/home/khalidvm/Desktop/Workspace/Front/frontend_v2/node_modules/clean-css/lib/reader/read-sources.js:33:12)
    at readSources (/home/khalidvm/Desktop/Workspace/Front/frontend_v2/node_modules/clean-css/lib/reader/read-sources.js:24:10)
    at /home/khalidvm/Desktop/Workspace/Front/frontend_v2/node_modules/clean-css/lib/clean.js:99:12
    at _combinedTickCallback (internal/process/next_tick.js:95:7)
    at process._tickCallback (internal/process/next_tick.js:161:9)

it seems that it fails when cleaning css.

Here is my package.json :

{
  "name": "test",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "karma": "ng test",
    "test": "jest",
    "test:watch": "jest --watch",
    "test:ci": "jest --runInBand",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^5.2.6",
    "@angular/common": "^5.2.6",
    "@angular/compiler": "^5.2.6",
    "@angular/core": "^5.2.6",
    "@angular/forms": "^5.2.6",
    "@angular/http": "^5.2.6",
    "@angular/platform-browser": "^5.2.6",
    "@angular/platform-browser-dynamic": "^5.2.6",
    "@angular/platform-server": "^5.2.6",
    "@angular/router": "^5.2.6",
    "angular-2-local-storage": "^1.0.1",
    "angular2-drag-scroll": "1.2.6",
    "angular2-jwt": "^0.2.3",
    "angular2-multiselect-dropdown": "1.3.6",
    "bootstrap": "^3.3.7",
    "core-js": "^2.4.1",
    "file-saver": "^1.3.3",
    "font-awesome": "^4.7.0",
    "hammerjs": "^2.0.8",
    "jest-preset-angular": "^2.0.5",
    "json2typescript": "1.0.5",
    "lodash": "^4.12.0",
    "moment": "^2.18.1",
    "ng-http-interceptor": "^3.1.2",
    "ng2-smart-table": "^1.1.0",
    "ngx-bootstrap": "2.0.2",
    "ngx-filesaver": "0.0.2",
    "ngx-modialog": "^5.0.0",
    "ngx-pagination": "^3.0.1",
    "ngx-tooltip": "0.0.9",
    "npm": "^5.2.0",
    "proxy-polyfill": "^0.1.7",
    "rxjs": "^5.5.6",
    "sha1": "^1.1.1",
    "smoothscroll-polyfill": "^0.3.5",
    "web-animations-js": "^2.2.5",
    "zone.js": "^0.8.8"
  },
  "devDependencies": {
    "@angular/cli": "1.7.1",
    "@angular/compiler-cli": "^5.2.6",
    "@types/jasmine": "2.5.38",
    "@types/jest": "^20.0.5",
    "@types/node": "~6.0.60",
    "codelyzer": "~2.0.0",
    "jasmine-core": "~2.5.2",
    "jasmine-spec-reporter": "~3.2.0",
    "jest": "^20.0.4",
    "karma": "~1.4.1",
    "karma-chrome-launcher": "~2.0.0",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^0.2.0",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.1.0",
    "ts-jest": "^20.0.7",
    "ts-node": "~2.0.0",
    "tslint": "~4.5.0",
    "typescript": "2.4.2"
  },
  "jest": {
    "preset": "jest-preset-angular",
    "setupTestFrameworkScriptFile": "<rootDir>/src/setupJest.ts",
    "transformIgnorePatterns": [
      "node_modules/(?!json2typescript|angular2-multiselect-dropdown|ngx-filesaver|ngx-bootstrap|angular2-drag-scroll)"
    ]
  }
}

i ve cleaned npm cache , deleted the package-lock.json , re-installed node_modules , also i have downgraded to angular-cli 1.6.8 and 1.6.8 but , with 1.6.x there is another issue which appears , therefore i was told to upgrade to 1.7.x .

But unfortenately this comes worse.

Also it's difficult to beautify manually all my css data , because ai have a huge css data.

Suggestions ?

Run your sass/css files to show all space characters. I am pretty sure there is a non-breaking space somewhere between your properties which is causing it to break. something like

{
  color:[non-breaking-space]#123456;
}

You can spot these bad characters by installing a VS code plugin called Highlight Bad Chars https://marketplace.visualstudio.com/items?itemName=wengerk.highlight-bad-chars

TL;DR: Use an editor to find non-breaking spaces and eliminate them.

While it seems clean-css is failing fantastically after @angular/cli 1.6.7, this issue can be resolved for later versions of @angular/cli, regardless.

I got a lead on this issue being caused by non-breaking spaces: https://github.com/jakubpawlowicz/clean-css/issues/1006

I was then able to resolve the issue by opening the src/ folder as a workspace in Notepad++, filtering on *.scss and *.css, and doing a search with Regex on using \xA0 to find non-breaking spaces in the scss/css files; I found one. Once removed, my error went away.

For those that want to know how to accomplish this in Notepad++ in detail:

File > Open Folder as Workspace... ; choose your folder containing your code
In the Folder as Workspace window, right-click the folder and choose "Find in Files"
in the "Find what" window, put \xA0
In the "Filters" window, put *.scss *.css
Under the "Search Mode" field set at the bottom, select "Regular expression"
Click "Find All" and your offending non-breaking space locations should show up in the find window. Double-click on them to go to them and then delete and save.
Profit.

Used js-beautify (https://github.com/beautify-web/js-beautify)

npm -g install js-beautify

Then cd to /src.

Then create .jsbeautifyrc en /src path.

{
"css": {
    "allowed_file_extensions": [
        "css",
        "scss",
        "sass",
        "less"
    ],
    "end_with_newline": false,
    "indent_char": " ",
    "indent_size": 4,
    "newline_between_rules": true,
    "selector_separator": " ",
    "selector_separator_newline": false,
    "preserve_newlines": false,
    "max_preserve_newlines": 1
}

}

And finally apply to all .scss files (or .css if you have them)

In Windows I used: FORFILES /S /M *.scss /C "cmd /c css-beautify -r -f @file"

来源：https://stackoverflow.com/questions/49033898/angular-5-ng-build-prod-fails-due-to-clean-css-cannot-read-property-line

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