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errors: add toError utility and migrate assertError usages

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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
This commit is contained in:
Patrik Oldsberg
2026-04-03 01:33:34 +02:00
parent 3cdf048f77
commit b2319ffe45
70 changed files with 400 additions and 345 deletions
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.changeset/add-to-error-utility.md
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'@backstage/errors': minor
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A new `toError` utility function is now available for converting 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 to avoid unhelpful messages like `[object Object]`. Non-error causes passed to `CustomErrorBase` are now converted and stored using `toError` rather than discarded.