This content originally appeared on DEV Community and was authored by Sibelius Seraphini
What is a Script?
A script is a code that you can run directly from your terminal.
It is a runnable code
Here is a minimal node script
const run = async () => {
};
(async () => {
try {
await run();
} catch (err) {
// eslint-disable-next-line
console.log(err);
process.exit(1);
}
process.exit(0);
})();
How we run scripts at Woovi monorepo?
We run node scripts in many ways:
node path/to/myScript.ts
yarn es path/to/myScript.ts
yarn w path/to/myScript.ts
yarn es is the same as node -r esbuild-register, it is running node using esbuild
yarn w is running the script using webpack
We use esbuild and webpack to be able to run any code in our monorepo, using typescript.
This causes a lot of trouble to detecting if a file is running as the entrypoint of a script or not.
How to check if a node file is running as a script?
We use !module.parent for node and esbuild, but we inject WEBPACK_ENTRY when using webpack, as we run the final webpack bundled code.
import path from 'path';
const cwd = process.cwd();
export const isMainScript = (require, module, filename: string) => {
// webpack_entry is the real
if (process.env.WEBPACK_ENTRY) {
const fullEntry = path.join(cwd, process.env.WEBPACK_ENTRY);
const fullFilename = path.join(cwd, filename);
if (fullEntry === fullFilename) {
return true;
}
return false;
}
if (!module.parent) {
return true;
}
// eslint-disable-next-line
console.log('not main script, check your script code');
return false;
};
In Conclusion
We need to detect if a file is running as script to avoid running the file script code if we are sharing some code.
Going deep in the rabbit hole, let us improve the DX of running scripts at Woovi
Woovi
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If you want to work with us, we are hiring!
Photo by Tianyi Ma on Unsplash
This content originally appeared on DEV Community and was authored by Sibelius Seraphini
Sibelius Seraphini | Sciencx (2023-03-07T14:02:17+00:00) How to check if a node file is running as a script?. Retrieved from https://www.scien.cx/2023/03/07/how-to-check-if-a-node-file-is-running-as-a-script/
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