Solvedant design landing ValidationError: Invalid options object. Less Loader has been initialized using an options object that does not match the API schema.


Failed to compile
./src/Home/less/antMotionStyle.less (./node_modules/css-loader/dist/cjs.js??ref--6-oneOf-7-1!./node_modules/postcss-loader/src??postcss!./node_modules/less-loader/dist/cjs.js??ref--6-oneOf-7-3!./src/Home/less/antMotionStyle.less)
ValidationError: Invalid options object. Less Loader has been initialized using an options object that does not match the API schema.

  • options has an unknown property 'source'. These properties are valid:
    object { lessOptions?, prependData?, appendData?, sourceMap? }
    This error occurred during the build time and cannot be dismissed.
    截屏2020-05-03 上午12 05 19
16 Answers

✔️Accepted Answer

temporary way to fix this problem:ant-design/ant-design#23624 😢

remove less-loader@6.0.6 and install less-loader@5.0.0 fixed on me.

插个眼同问 :(


  lessOptions: {
    javascriptEnabled: true,
    modifyVars: { '@primary-color': '#1DA57A' },


Other Answers:



                        loader: 'less-loader', 
                        options: {
                            lessOptions: {
                                javascriptEnabled: true


Have the same issue, any updates?

@pitops change the less-loader version from 6.0 to 5.0, then restart it.

$ yarn remove less-loader
$ yarn add less-loader@5.0.0
$ yarn start

For the one who is using 'create-react-app' to customize the theme can check the following settings:


const CracoLessPlugin = require("craco-less");

module.exports = {
  plugins: [
      plugin: CracoLessPlugin,
      options: {
        lessLoaderOptions: {
          lessOptions: {
            javascriptEnabled: true,
            modifyVars: { "@primary-color": "#018a9e" },


  "dependencies": {
    "@craco/craco": "^5.6.4",
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.3.2",
    "@testing-library/user-event": "^7.1.2",
    "antd": "^4.2.5",
    "craco-less": "^1.17.0",
    "eslint-plugin-prettier": "^3.1.3",
    "lodash": "^4.17.15",
    "prettier": "^2.0.5",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-redux": "^7.2.0",
    "react-router-dom": "^5.2.0",
    "react-scripts": "3.4.1",
    "redux": "^4.0.5"

temporary way to fix this problem:ant-design/ant-design#23624 😢

remove less-loader@6.0.0 and install less-loader@5.0.0 fixed on me.

插个眼同问 :(

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