Provides the Nu Html Checker «vnu.jar» file
npm install vnu-jarvnu-jar lets you use the Nu Html Checker (vnu) from within JavaScript code — to catch unintended mistakes in HTML, CSS, and SVG content.
``sh`
npm install --save vnu-jar
Here’s an example of how to create a simple vnu-check.js program that uses the vnu-jar package to invoke the Nu Html Checker (vnu), pass it whatever arguments the user specifies, and then emit the checker output.
`js`
'use strict';
const { vnu } = require('vnu-jar');
(async () => {
try {
console.log(await vnu.check(process.argv.slice(2)));
} catch (err) {
console.error(err.message.trim());
process.exit(1);
}
})();
When installed or run via npx, the package also provides a vnu command that causes the vnu.jar program to be invoked and run with whatever arguments you specify:
`sh`
npx vnu --verbose file1.html file2.html
npx vnu --help
This npm package includes the vnu.jar Java program — so to use the package, users will additionally need a Java environment that provides a java command.
For that reason, the package runs a postinstall script which — if it finds no java command in the user’s environment during install — will then _automatically_ install a (Node.js-local) Java runtime environment, in node_modules/.cache/vnu-jar/java/`).