TypeScript: Compiling Handlebars templates with custom data

handlebars.ts

import Handlebars from "handlebars";
import fs from "node:fs";

type Data = Record<string, unknown>;
type Template = (data: Data) => string;

export default class Templater {
    private readonly template: Template;

    public static using(templatePath: string): Templater {
        const templateString = fs.readFileSync(templatePath, "utf8");
        return new Templater(templateString);
    }

    public render(data: Data): string {
        return this.template(data);
    }

    public save(data: Data, outputPath: string): Templater {
        const rendered = this.render(data);
        fs.writeFileSync(outputPath, rendered);

        return this;
    }

    private constructor(templateString: string) {
        this.template = Handlebars.compile(templateString, {
            strict: true
        });
    }
}

/* Example 1: Rendering and displaying template */
const readme = Templater
    .using("README.md.tpl")
    .render({ name: "World" });
console.log(readme);

/* Example 2: Saving rendered template directly to file */
const templater = Templater
    .using("README.md.tpl")
    .save({ name: "World" }, "README.md");