Introduction
When working with TypeScript, chances are you’ll often encounter an error message like “Property X doesn’t exist on sort Request”. This error sometimes arises when TypeScript can’t discover a property throughout the Request object.
On this Byte, we’ll clarify the error and present how one can resolve it.
What does this error imply?
This normally happens when TypeScript is unable to find a property throughout the Request object, which is part of the Categorical.js framework. This might occur for just a few causes, just like the property being undefined, or TypeScript not having the ability to acknowledge the property. Here is an instance of how the error would possibly look:
app.get('/route', (req, res) => {
console.log(req.fakeProperty);
});
On this case, TypeScript will throw an error saying Property 'fakeProperty' doesn't exist on sort 'Request'.
Utilizing –files Flag with ts-node
One option to repair this error is through the use of the --files flag with the ts-node command. This flag forces TypeScript to incorporate all TypeScript information within the compilation, somewhat than simply those which are straight imported or referenced.
$ ts-node --files server.ts
This command will compile all TypeScript information, which coudl embody one which comprises the lacking property, thereby resolving the error.
Word: Utilizing the --files flag will seemingly decelerate the compilation course of because it contains all TypeScript information within the compilation.
Including Path to Varieties Listing in tsconfig.json
One other option to resolve this error is by including the trail to the kinds listing in your tsconfig.json file. This permits TypeScript to acknowledge the kinds and properties which are outlined in your undertaking.
{
"compilerOptions": {
"typeRoots": ["./node_modules/@types", "./types"]
}
}
Right here we have added the ./sorts listing to the typeRoots array, which inludes the article/property definition. Now, TypeScript will be capable to acknowledge the properties outlined within the sorts inside this listing.
Conclusion
The “Property X doesn’t exist on sort Request” error in TypeScript is a typical challenge that reveals up when TypeScript is not capable of find a property throughout the Request object. Through the use of the --files flag with the ts-node command or including the trail to the kinds listing in your tsconfig.json file, you may resolve this error.
