@langchain/core/dist/load/map_keys.js

Core LangChain.js abstractions and schemas

//#region src/load/map_keys.ts
const UPPER_TO_WORD_BOUNDARY = /([A-Z]+)([A-Z][a-z0-9]+)/g;
const LOWER_TO_UPPER_BOUNDARY = /([a-z0-9])([A-Z])/g;
const SEPARATORS = /[-_\s]+/g;
function snakeCase(key) {
	return key.replace(UPPER_TO_WORD_BOUNDARY, "$1_$2").replace(LOWER_TO_UPPER_BOUNDARY, "$1_$2").replace(SEPARATORS, "_").toLowerCase();
}
function camelCase(key) {
	const trimmed = key.trim();
	if (!/[-_\s]/.test(trimmed)) return trimmed;
	return trimmed.replace(SEPARATORS, "_").toLowerCase().replace(/_+([a-z0-9])/g, (_, char) => char.toUpperCase());
}
function keyToJson(key, map) {
	return map?.[key] || snakeCase(key);
}
function keyFromJson(key, map) {
	return map?.[key] || camelCase(key);
}
function mapKeys(fields, mapper, map) {
	const mapped = {};
	for (const key in fields) if (Object.hasOwn(fields, key)) mapped[mapper(key, map)] = fields[key];
	return mapped;
}
//#endregion
export { keyFromJson, keyToJson, mapKeys };

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