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12 changes: 12 additions & 0 deletions packages/core/src/config/bundle-extends.ts
Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,18 @@ export function bundleExtends({
return node;
}

const invalidEntries = node.extends
.map((item, index) => ({ item, index }))
.filter(({ item }) => typeof item !== 'string');

if (invalidEntries.length > 0) {
const positions = invalidEntries.map(({ index }) => index).join(', ');
throw new Error(
`Found ${invalidEntries.length} unresolvable "extends" entr${invalidEntries.length === 1 ? 'y' : 'ies'} ` +
`at position(s) [${positions}]. Each "extends" entry must be a resolvable preset name, file path, or URL.`
);
}

const resolvedExtends = (node.extends || [])
.map((presetItem: string) => {
if (!isAbsoluteUrl(presetItem) && !path.extname(presetItem)) {
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