TypeError: Module “file:///Users/user/Desktop/../tsconfig.json” needs an import assertion of type “json” Error: Your configured rpc port: 8899 is already in use | Solana anchor run test |

anchor test — skip-local-validator

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Ever ran this command after running a local ledger through ‘solana-test-validator’, ‘anchor build’ and ‘anchor deploy’—

anchor run test 

And encountered this error? →

TypeError: Module “file:///Users/user/Desktop/../tsconfig.json” needs an import assertion of type “json”

Or

Error: Your configured rpc port: 8899 is already in use

And finally,

error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Solution —

Run this command →

yarn add ts-mocha

You should see similar output such as these →

yarn add v1.22.18
warning package.json: No license field
warning No license field
[1/4] 🔍 Resolving packages…
[2/4] 🚚 Fetching packages…
[3/4] 🔗 Linking dependencies…
[4/4] 🔨 Building fresh packages…
success Saved lockfile.
warning No license field
warning “ts-mocha” is already in “devDependencies”. Please remove existing entry first before adding it to “dependencies”.
success Saved 1 new dependency.
info Direct dependencies
└─ ts-mocha@10.0.0
info All dependencies
└─ ts-mocha@10.0.0
✨ Done in 1.75s.

Then run this again →

anchor run test

You should be able to see similar outputs →

yarn run v1.22.18
warning package.json: No license field
…
…
Your transaction signature 
…
 ✔ Is initialized! (471ms)
1 passing (474ms)
✨ Done in 6.36s.

There you go, you have the test passing!

Alternatively, you might want to try running this command —

anchor test — skip-local-validator

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