Alternative version of Typescript utilized within the `npm run` command script

Utilizing npm for my build tasks, I have included an entry in the scripts section of my packages.json file labeled "tsc", which compiles the .ts files within my project. However, I recently noticed that I was encountering different TypeScript error messages when running > tsc directly versus using > npm run start. After updating the script entry to (tsc -v; tsc), I observed:

> npm run build
message TS6029: Version 1.6.2

On the other hand, if I execute the same command directly, I receive:

> (tsc -v; tsc)
Version 1.8.10

I am puzzled by what might be causing this discrepancy in behavior. Any insights?

typescriptnpmnpm-run

Answer №1

Oh no! After reviewing my package.json file, I noticed that the devDependencies section had this line: "typescript": "~1.6.2". I quickly changed it to ~1.8.10, ran > npm install, and thankfully the issue was resolved.

Answer №2

Another thing to consider (for those facing a similar issue without a direct dependency) is the possibility of other npm packages depending on an older version of TypeScript. Even if nothing in your package.json indicates this, npm will still locate and use the transitive dependency.

Take for instance the grunt-typescript module, which relies on an outdated version of TypeScript. Although it may still function properly, this could lead to conflicts when using tsc -p . in a postinstall script.

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