Error: Schema must contain uniquely named types but contains multiple types named "RemarkHeadingLevels"

[JesusPerez]

node -v v12.13.0
npm -v 6.13.0
MacOS Catalina or Linux

Just simply runs:

npm install
yarn upgrade
npm build 

Initializing plugins...
Load sources - 0.19s
Error: Schema must contain uniquely named types but contains multiple types named "RemarkHeadingLevels".
at typeMapReducer (/gridsome-portfolio-starter/node_modules/graphql/type/schema.js:262:13)
at Array.reduce ()
at typeMapReducer (/gridsome-portfolio-starter/node_modules/graphql/type/schema.js:285:34)
at typeMapReducer (/gridsome-portfolio-starter/node_modules/graphql/type/schema.js:286:20)
at Array.reduce ()
at new GraphQLSchema (/gridsome-portfolio-starter/node_modules/graphql/type/schema.js:145:28)
at SchemaComposer.buildSchema (/gridsome-portfolio-starter/node_modules/graphql-compose/lib/SchemaComposer.js:131:12)
at Schema.buildSchema (/gridsome-portfolio-starter/node_modules/gridsome/lib/app/Schema.js:35:35)
at Plugins.createSchema (/gridsome-portfolio-starter/node_modules/gridsome/lib/app/Plugins.js:94:22)

[drehimself]

Yeah, I get this too when updating to the latest versions of vue-remark and/or transformer-remark (that's why I didn't merge the PRs). I will take a look at this when I have time, or if you/someone figures it out, let me know!

[rolbr]

I'm also getting this. Doesn't seem to be a problem with this repo though, as it's also occuring on the main project: gridsome/gridsome#815

[distinctperspective]

Its happening to me even after downgrading vue.remark