I am implementing a piece of code which goes through project's build and checks if there are multiple pages with featured: true. If that is a case, I want to throw an error, so that qa job in a pipeline would fail. Everything would work fine but I am getting:
UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch()
this is my code:
/* eslint-disable no-restricted-syntax */
const fs = require('fs');
const findInDir = require('./utils/findInDir');
(async () => {
const dir = './public/page-data/blog';
const fileRegex = /.*/;
const allFiles = findInDir(dir, fileRegex);
let result = 0;
for (const file of allFiles) {
try {
// eslint-disable-next-line no-await-in-loop
const data = await fs.promises.readFile(file);
const obj = JSON.parse(data);
if (obj.result.pageContext.featured === true) {
result += 1;
}
} catch (err) {
// noop
}
}
if (result > 1) {
throw new Error('There are multiple featured blog posts, please fix.');
}
})();
How can I throw an error in async function?
You can error can be handled with a catch block, like this:-
/* eslint-disable no-restricted-syntax */
const fs = require('fs');
const findInDir = require('./utils/findInDir');
(async () => {
const dir = './public/page-data/blog';
const fileRegex = /.*/;
const allFiles = findInDir(dir, fileRegex);
let result = 0;
for (const file of allFiles) {
try {
// eslint-disable-next-line no-await-in-loop
const data = await fs.promises.readFile(file);
const obj = JSON.parse(data);
if (obj.result.pageContext.featured === true) {
result += 1;
}
} catch (err) {
// noop
}
}
if (result > 1) {
throw new Error('There are multiple featured blog posts, please fix.');
}
})().catch((e) => {
console.log(e);
});