Error:

node_modules/rc-mentions/lib/util.d.ts(4,55): error TS1110: Type expected.

I encountered this error when I was creating a web part in SharePoint Framework using ReactJS.

Solution:

Install the latest version of Typescript or update rush-stack-compiler

npm install typescript@latest
npm install @microsoft/rush-stack-compiler-3.3 --save

or you can use

npm update

Verify that the folder named rush-stack-compiler-3.3 inside node_modules/@microsoft folder.

Now remove dependencies from package.json file for older version and include for the new one.
Change tsconfig.json file in extends field for the new path.

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