How to detect unused variables in Typescript?
As of version 2.0, Typescript has built-in support for detecting unused local variables and parameters. The compiler flags are as follows:
--noUnusedLocals Report Errors on Unused Locals. --noUnusedParameters Report Errors on Unused Parameters.
You can use TSLint instead.
https://palantir.github.io/tslint/
There's a rule for that: https://palantir.github.io/tslint/rules/no-unused-variable/
Edit:
Although this works, if you are using TypeScript 2 +, the compiler flags/options mentioned in the other answers.
You can also detect unused variables in Typescript by updating the project’s tsconfig.json file to include noUnusedLocals and noUnusedParameters:
{ "compilerOptions": { "noUnusedLocals": true, "noUnusedParameters": true }}