@langchain/core/dist/messages/format.cjs

Core LangChain.js abstractions and schemas

//#region src/messages/format.ts
function convertToFormattedString(message, format = "pretty") {
	if (format === "pretty") return convertToPrettyString(message);
	return JSON.stringify(message);
}
function convertToPrettyString(message) {
	const lines = [];
	const title = ` ${message.type.charAt(0).toUpperCase() + message.type.slice(1)} Message `;
	const sepLen = Math.floor((80 - title.length) / 2);
	const sep = "=".repeat(sepLen);
	const secondSep = title.length % 2 === 0 ? sep : `${sep}=`;
	lines.push(`${sep}${title}${secondSep}`);
	if (message.type === "ai") {
		const aiMessage = message;
		if (aiMessage.tool_calls && aiMessage.tool_calls.length > 0) {
			lines.push("Tool Calls:");
			for (const tc of aiMessage.tool_calls) {
				lines.push(`  ${tc.name} (${tc.id})`);
				lines.push(` Call ID: ${tc.id}`);
				lines.push("  Args:");
				for (const [key, value] of Object.entries(tc.args)) lines.push(`    ${key}: ${value}`);
			}
		}
	}
	if (message.type === "tool") {
		const toolMessage = message;
		if (toolMessage.name) lines.push(`Name: ${toolMessage.name}`);
	}
	if (typeof message.content === "string" && message.content.trim()) {
		if (lines.length > 1) lines.push("");
		lines.push(message.content);
	}
	return lines.join("\n");
}

//#endregion
exports.convertToFormattedString = convertToFormattedString;
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