@arizeai/phoenix-evals/dist/esm/template/applyTemplate.js

A library for running evaluations for AI use cases

import Mustache from "mustache";
import { createTemplateVariablesProxy } from "./createTemplateVariablesProxy.js";
/**
 * A function that applies a set of variables to a template (e.g. a prompt)
 * Uses the Mustache library to apply the variables to the template
 */
export function formatTemplate(args) {
    const { template, variables } = args;
    const variablesProxy = createTemplateVariablesProxy(variables);
    if (typeof template === "string") {
        return renderTemplateString(template, variablesProxy);
    }
    return template.map((message) => {
        if (message.content !== undefined && typeof message.content === "string") {
            return {
                ...message,
                content: renderTemplateString(message.content, variablesProxy),
            };
        }
        return message;
    });
}
function renderTemplateString(template, variables) {
    // Disable HTML escaping by providing a custom escape function that returns text as-is
    return Mustache.render(template, variables, {}, { escape: (text) => text });
}
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