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* Copyright 2026 nodearchive
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import type { ArchiveFormat } from '../../.types/ArchiveFormat/type.js'
import { NodearchiveError } from '../../.errors/class.js'
const supportedFormats = ['nar', 'zip', 'tar', 'tgz', 'tar.gz', 'gz'] as const
const knownSuffixes = [
['.tar.gz', 'tar.gz'],
['.tgz', 'tgz'],
['.zip', 'zip'],
['.tar', 'tar'],
['.nar', 'nar'],
['.gz', 'gz'],
] as const satisfies readonly (readonly [string, ArchiveFormat])[]
export function resolveOutputFormat(
destinationPath?: string,
outFormat?: string
): ArchiveFormat {
const inferred = inferOutputFormat(destinationPath)
if (!outFormat) {
return inferred ?? 'nar'
}
if (!supportedFormats.includes(outFormat as ArchiveFormat)) {
throw new NodearchiveError(
'ARCHIVE_OUTPUT_FORMAT_INVALID',
`Unsupported output format: ${outFormat}`
)
}
if (
inferred !== undefined &&
normalizeArchiveFormat(inferred) !==
normalizeArchiveFormat(outFormat as ArchiveFormat)
) {
throw new NodearchiveError(
'ARCHIVE_OUTPUT_FORMAT_INVALID',
`Destination extension does not match \`${outFormat}\``
)
}
return outFormat as ArchiveFormat
}
function inferOutputFormat(
destinationPath?: string
): ArchiveFormat | undefined {
if (!destinationPath) {
return undefined
}
const lowerPath = destinationPath.toLowerCase()
for (const [suffix, format] of knownSuffixes) {
if (lowerPath.endsWith(suffix)) {
return format
}
}
return undefined
}
function normalizeArchiveFormat(format: ArchiveFormat): ArchiveFormat {
return format === 'tgz' ? 'tar.gz' : format
}
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