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// Provenance: dayflower/popmark (fixed).
// repo: dayflower/popmark
// commit: e5ac407cef37c37178d440541ede301c838640fb
// parent: 31d1ac79b4cfa3118597348e79800a6561115149
// commit_url: https://github.com/dayflower/popmark/commit/e5ac407cef37c37178d440541ede301c838640fb
// cve:
// license: MIT
// function: deepMergeInto
// relpath: src/lexical-markdown/config/editorConfig.ts
// provenance: agent
// mechanism: prototype_pollution
function deepMergeInto(
target: Record<string, unknown>,
source: Record<string, unknown>,
): Record<string, unknown> {
for (const key of Object.keys(source)) {
// popmark patch: guard against prototype pollution (CodeQL).
if (key === "__proto__" || key === "constructor" || key === "prototype") {
continue;
}
const sourceValue = source[key];
if (sourceValue === undefined) continue;
if (isPlainObject(sourceValue)) {
const targetValue = target[key];
const nested = isPlainObject(targetValue) ? targetValue : {};
target[key] = deepMergeInto(nested, sourceValue);
} else {
target[key] = sourceValue;
}
}
return target;
}