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fix: scale translation output token ceiling with batch size #11

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Merged
Peyton-Spencer merged 1 commit into from
Aug 10, 2026
Merged

fix: scale translation output token ceiling with batch size #11

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12 changes: 10 additions & 2 deletions src/translate.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -125,16 +125,20 @@ export async function translateBatch(
JSON.stringify(entries, null, 2),
].join("\n");

const attempt = async (prompt: string) => {
const attempt = async (prompt: string, keyCount: number) => {
const { text } = await generateText({
model,
system: systemPrompt || defaultSystem,
prompt,
// Provider-default output ceilings (often 4k tokens) truncate large
// batches mid-JSON ("Unterminated string in JSON"). Scale the ceiling
// with batch size so the full object always fits.
maxTokens: Math.min(32_000, 2_000 + 400 * keyCount),
});
return collectBatchTranslations(extractJsonObject(text), keys);
};

let { translations, missing } = await attempt(basePrompt);
let { translations, missing } = await attempt(basePrompt, keys.length);

if (missing.length > 0) {
// One corrective retry for just the missing keys, then hard-fail so the
Expand All @@ -149,6 +153,7 @@ export async function translateBatch(
contextSection,
JSON.stringify(retryEntries, null, 2),
].join("\n"),
missing.length,
);
translations = { ...translations, ...retry.translations };
missing = retry.missing;
Expand Down Expand Up @@ -194,6 +199,9 @@ export async function translateMarkdown(
translated: z.string(),
}),
system: systemPrompt || defaultSystem,
// Scale the output ceiling with document size so long documents are not
// truncated by provider-default limits.
maxTokens: Math.min(32_000, 2_000 + Math.ceil(content.length / 2)),
prompt: [
`Translate this Markdown/MDX content from "${sourceLocale}" to "${targetLocale}".`,
`Return the complete translated document.`,
Expand Down
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