javascript - Babel-Loader Syntax error on npm run build - Stack Overflow

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I am not very strong with webpack and am trying to update webpack from V3 to V4 and have managed to update my webpack config to the point where its not throwing depreciation errors at me, but I am now stuck on a syntax error from babel-loader:

      Module build failed (from ./node_modules/babel-loader/lib/index.js):
      /path/react/node_modules/schema-utils/dist/util/hints.js:16
      const currentSchema = { ...schema
      SyntaxError: Unexpected token ...

In my webpack config I have this:

         test: /\.(js|jsx)$/,
            use: [
              {
                loader: 'babel-loader',
                options: {
                  presets: [
                    '@babel/preset-env',
                    '@babel/preset-react',
                    {
                      plugins: [
                        '@babel/plugin-proposal-class-properties'
                      ]
                    }
                  ],
                  pact: true,
                  cacheDirectory: false, // @todo: legacy option: true
                },
              }
            ]

and I am using the following versions:

 "@babel/core": "^7.1.6",
 "@babel/plugin-proposal-class-properties": "^7.8.3",
 "@babel/preset-env": "^7.1.6",
 "@babel/preset-react": "^7.0.0",
 "babel-loader": "^8.0.4",

I have tried multiple times with diffent versions of babel but always end up at this message. Can anyone see any obvious mistakes I am making?

I am not very strong with webpack and am trying to update webpack from V3 to V4 and have managed to update my webpack config to the point where its not throwing depreciation errors at me, but I am now stuck on a syntax error from babel-loader:

      Module build failed (from ./node_modules/babel-loader/lib/index.js):
      /path/react/node_modules/schema-utils/dist/util/hints.js:16
      const currentSchema = { ...schema
      SyntaxError: Unexpected token ...

In my webpack config I have this:

         test: /\.(js|jsx)$/,
            use: [
              {
                loader: 'babel-loader',
                options: {
                  presets: [
                    '@babel/preset-env',
                    '@babel/preset-react',
                    {
                      plugins: [
                        '@babel/plugin-proposal-class-properties'
                      ]
                    }
                  ],
                  pact: true,
                  cacheDirectory: false, // @todo: legacy option: true
                },
              }
            ]

and I am using the following versions:

 "@babel/core": "^7.1.6",
 "@babel/plugin-proposal-class-properties": "^7.8.3",
 "@babel/preset-env": "^7.1.6",
 "@babel/preset-react": "^7.0.0",
 "babel-loader": "^8.0.4",

I have tried multiple times with diffent versions of babel but always end up at this message. Can anyone see any obvious mistakes I am making?

• javascript
• reactjs
• npm
• webpack
• babeljs

Share Improve this question Follow asked Jun 2, 2020 at 12:51 Thomas AllenThomas Allen 81188 gold badges1818 silver badges3333 bronze badges

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 5

The SyntaxError: Unexpected token ... implies that your node isn't transpiling ES6. Have you upgraded node/npm to relatively new versions?

Also, if you're changing versions, I would suggest deleting your node_modules folder and package-lock.json file before running npm install again.

I am not very strong with webpack and am trying to update webpack from V3 to V4 and have managed to update my webpack config to the point where its not throwing depreciation errors at me, but I am now stuck on a syntax error from babel-loader:

      Module build failed (from ./node_modules/babel-loader/lib/index.js):
      /path/react/node_modules/schema-utils/dist/util/hints.js:16
      const currentSchema = { ...schema
      SyntaxError: Unexpected token ...

In my webpack config I have this:

         test: /\.(js|jsx)$/,
            use: [
              {
                loader: 'babel-loader',
                options: {
                  presets: [
                    '@babel/preset-env',
                    '@babel/preset-react',
                    {
                      plugins: [
                        '@babel/plugin-proposal-class-properties'
                      ]
                    }
                  ],
                  pact: true,
                  cacheDirectory: false, // @todo: legacy option: true
                },
              }
            ]

and I am using the following versions:

 "@babel/core": "^7.1.6",
 "@babel/plugin-proposal-class-properties": "^7.8.3",
 "@babel/preset-env": "^7.1.6",
 "@babel/preset-react": "^7.0.0",
 "babel-loader": "^8.0.4",

I have tried multiple times with diffent versions of babel but always end up at this message. Can anyone see any obvious mistakes I am making?

I am not very strong with webpack and am trying to update webpack from V3 to V4 and have managed to update my webpack config to the point where its not throwing depreciation errors at me, but I am now stuck on a syntax error from babel-loader:

      Module build failed (from ./node_modules/babel-loader/lib/index.js):
      /path/react/node_modules/schema-utils/dist/util/hints.js:16
      const currentSchema = { ...schema
      SyntaxError: Unexpected token ...

In my webpack config I have this:

         test: /\.(js|jsx)$/,
            use: [
              {
                loader: 'babel-loader',
                options: {
                  presets: [
                    '@babel/preset-env',
                    '@babel/preset-react',
                    {
                      plugins: [
                        '@babel/plugin-proposal-class-properties'
                      ]
                    }
                  ],
                  pact: true,
                  cacheDirectory: false, // @todo: legacy option: true
                },
              }
            ]

and I am using the following versions:

 "@babel/core": "^7.1.6",
 "@babel/plugin-proposal-class-properties": "^7.8.3",
 "@babel/preset-env": "^7.1.6",
 "@babel/preset-react": "^7.0.0",
 "babel-loader": "^8.0.4",

I have tried multiple times with diffent versions of babel but always end up at this message. Can anyone see any obvious mistakes I am making?

• javascript
• reactjs
• npm
• webpack
• babeljs

Share Improve this question Follow asked Jun 2, 2020 at 12:51 Thomas AllenThomas Allen 81188 gold badges1818 silver badges3333 bronze badges

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 5

The SyntaxError: Unexpected token ... implies that your node isn't transpiling ES6. Have you upgraded node/npm to relatively new versions?

Also, if you're changing versions, I would suggest deleting your node_modules folder and package-lock.json file before running npm install again.

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