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Patrik Oldsberg b2319ffe45 errors: add toError utility and migrate assertError usages

Add a `toError` utility function to `@backstage/errors` that converts
unknown values to `ErrorLike` objects. If the value is already error-like
it is returned as-is. Strings are used directly as the error message, and
other values are stringified with a fallback to JSON.stringify to avoid
unhelpful `[object Object]` messages.

Non-error causes passed to `CustomErrorBase` are now converted and stored
using `toError` rather than discarded. Existing `assertError` call sites
across the codebase are migrated to `toError`.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

2026-04-03 10:16:23 +02:00

dev

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src

errors: add toError utility and migrate assertError usages

2026-04-03 10:16:23 +02:00

.eslintrc.js

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catalog-info.yaml

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CHANGELOG.md

Version Packages (next)

2026-03-31 15:30:51 +00:00

config.d.ts

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knip-report.md

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package.json

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README.md

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report.api.md

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README.md

DevTools Backend

Welcome to the DevTools backend plugin! This plugin provides data for the DevTools frontend features.

Setup

Here's how to get the DevTools Backend up and running in the new backend system:

First we need to add the @backstage/plugin-devtools-backend package to your backend:

# From the Backstage root directory
yarn --cwd packages/backend add @backstage/plugin-devtools-backend

Then add the plugin to your backend index file:

// In packages/backend/src/index.ts
const backend = createBackend();
// ... other feature additions
backend.add(import('@backstage/plugin-devtools-backend'));

Now run yarn start-backend from the repo root
Finally open http://localhost:7007/api/devtools/health in a browser and it should return {"status":"ok"}

README.md

DevTools Backend

Setup

Links