What is the best way to ensure the TypeScript type is correct prior to making a

When preparing to commit my code in TypeScript, I want to ensure that the type is correct before proceeding. To achieve this, I use the command tsc --noEmit $(changedFile). However, this command does not allow for the specification of a config file.

While exploring potential solutions, I came across the --project option. However, this option checks the entire project, and I only want to verify the type of the changedFile. Some old files may have type errors, but they do not require immediate attention.

How can I specifically validate the type of the changedFile before committing my changes?

gittypescript

Answer №1

Enhance your code quality with the amazing lint-staged tool.
This tool will automatically check and lint your files before each commit. https://github.com/okonet/lint-staged

Easy Installation

npx mrm lint-staged

Usage Tips for TypeScript Developers

// Include this in lint-staged.config.js
module.exports = {
  '**/*.ts?(x)': () => 'tsc -p tsconfig.json --noEmit'
}

Answer №2

Dealing with a similar issue, I found a solution using this package to validate types in the lint-staged:

"**/*.ts?(x)": [
  "tsc-files --noEmit"
]

To make use of this functionality, you can easily install the tsc-files package by running npm i tsc-files

Answer №3

If you're looking to streamline your workflow, consider implementing a pre-commit hook () in your Git repository.

Within this hook, you can access the files that are about to be committed using git diff --staged --name-only and subsequently execute tsc --noEmit $(changedFile) on those specific files.

Answer №4

tsc does not have a direct method for processing specific files with project settings. If you pass files to tsc, it will ignore the config file. However, it is possible to extend a config file and override its list of included files. For example:

$ cat ./tsconfig-temp.json

{
    "extends": "./tsconfig.json",
    "include": ["./temp.ts"]
}

You can create a wrapper script to dynamically generate a config file with the specified file(s). Here is an example script using "jo" to create the JSON:

$ cat tsc-files.sh

#!/usr/bin/bash

TEMP='./tsconfig-temp.json'
trap 'rm "$TEMP"' EXIT

jo extends=./tsconfig.json include=$(jo -a "$@") > $TEMP \
    && tsc --noEmit --project "$TEMP";

Usage

$ tsc-files.sh ./temp.ts

Alternatively, you can utilize the "tsc-files" package on npm, which automates this process for you:

Usage

$ tsc-files --noEmit ./temp.ts

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