TypeError: Cannot read property 'typeName' of undefined

Description

Seeing non-descriptive error (below) on gridsome build and gridsome develop.

TypeError: Cannot read property 'typeName' of undefined
    at fieldValue (.../node_modules/gridsome/lib/graphql/createFieldDefinitions.js:43:23)
    at fieldValues (.../node_modules/gridsome/lib/graphql/createFieldDefinitions.js:26:16)
    at createFieldDefinitions (.../node_modules/gridsome/lib/graphql/createFieldDefinitions.js:9:14)
    at module.exports.store (.../node_modules/gridsome/lib/graphql/nodes/index.js:14:20)
    at module.exports.store (.../node_modules/gridsome/lib/graphql/createSchema.js:7:41)
    at App.createSchema (.../node_modules/gridsome/lib/app/App.js:168:20)
    at process._tickCallback (internal/process/next_tick.js:68:7)

Expected result

Build is successful.

Environment

package.json:

{
  "name": "siteName",
  "private": true,
  "scripts": {
    "build": "gridsome build",
    "develop": "gridsome develop",
    "explore": "gridsome explore"
  },
  "dependencies": {
    "@gridsome/source-contentful": "^0.3.0",
    "gridsome": "^0.6.4",
    "vue-showdown": "^2.4.1"
  },
  "devDependencies": {
    "gridsome-plugin-purgecss": "^1.0.12",
    "gridsome-plugin-tailwindcss": "^1.3.2"
  }
}

gridsome.config.js

module.exports = {
	siteName: 'SiteName',
	plugins: [
		{
			use: 'gridsome-plugin-tailwindcss'
		},
		{
			use: 'gridsome-plugin-purgecss'
		},
		{
			use: '@gridsome/source-contentful',
			options: {
				space: process.env.xyz,
				accessToken: process.env.xyz,
				host: 'cdn.contentful.com',
				environment: 'master',
				typeName: 'Contentful',
				routes: {
					'Tag': '/tags/:slug',
					'Article': '/articles/:slug',
					'Page': ':slug'
				}
			}
		}
	]
}

For Tooling issues:

• Node version: v10.14.2
• Platform: Mac

Notes:

• Ran npm install/update today and noticed @gridsome/source-contentful had been updated today but unsure if that’s related.
• Tried upgrading/downgrading Gridsome and Contentful in package.json

[joranquinten]

This didn’t solve my issue, since the photo was completely deleted (non recoverable). It’s not helpful that the build doesn’t give a decent pointer. For those encountering this, I’ve change lines 75:81 in the gridsome/lib/graphql/createFieldDefinitions.js (v 0.7.16) into:

      for (let i = 0; i < length; i++) {
        if (value[i] && value[i].hasOwnProperty('typeName')){
          if (!value[i].typeName) {
            warn(`Missing typeName for reference at: ${path.join('.')}.${i}`)
          } else if (!currentValue.typeName.includes(value[i].typeName)) {
            currentValue.typeName.push(value[i].typeName)
          }
        } else {
          warn(`Missing typeName property for reference at: ${path.join('.')}.${i}`)
        }
      }

Which at least points into the right direction. This way I was able to find the deleted photos which were linked in other entries.

[maximilliangeorge]

This didn’t solve my issue, since the photo was completely deleted (non recoverable). It’s not helpful that the build doesn’t give a decent pointer. For those encountering this, I’ve change lines 75:81 in the gridsome/lib/graphql/createFieldDefinitions.js (v 0.7.16) into:

      for (let i = 0; i < length; i++) {
        if (value[i] && value[i].hasOwnProperty('typeName')){
          if (!value[i].typeName) {
            warn(`Missing typeName for reference at: ${path.join('.')}.${i}`)
          } else if (!currentValue.typeName.includes(value[i].typeName)) {
            currentValue.typeName.push(value[i].typeName)
          }
        } else {
          warn(`Missing typeName property for reference at: ${path.join('.')}.${i}`)
        }
      }

Which at least points into the right direction. This way I was able to find the deleted photos which were linked in other entries.

This was a huge help and a great improvement. You should submit this as a PR. Thanks a lot!