I am using TypeScript for my node.js backend development. Whenever I get an error in node.js it shows me the line number relating to the transpiled JavaScript (.js) files, not the TypeScript (.ts) files.
If you have used ionic, we get the error corresponding to the typescript file there.
Is there any way I get error line number relating to my typescript file? If yes please explain how and what changes I need to do to the config file.
Install source-map-support package.
$ npm install --save-dev source-map-support
Add this line in the entry point of node.js
require('source-map-support').install();
In your tsconfig.json,
{
"compilerOptions": {
"sourceMap": true
}
}
Ref: https://github.com/evanw/node-source-map-support#typescript-demo
tsc -p tsconfig.json
require('source-map-support').install()?
import 'source-map-support/register'It's also possible to register source-map via node's require option require within the cli:
node -r source-map-support/register compiled.js
The docs also point out that babel-register already includes source-map-support and that one can use it with mocha this way:
mocha --require source-map-support/register tests/
I did not want to call
require('source-map-support').install();
on each entry file. (It may be sufficient if you have only one entrypoint. Yet I have many.)
The basic setup still is the same as outlined by the existing solution.
You can achieve taht by having map files. When you have map files and map files are associated with js files then it will automatically give you line number from TS file.
You can generate map files using some configuration in tsconfig.json file
{
"compilerOptions": {
"sourceMap": true,
}
}
You need to keep sourceMap setting as true
node to show the line number of the error in the .ts file, not in the generated .js file.