Asymmetrik/node-rest-starter

import fs from 'fs/promises';

import config from 'config';
import handlebars from 'handlebars';
import _ from 'lodash';

handlebars.registerHelper('not', (value: boolean) => !value);
handlebars.registerHelper(
    'isEqual',
    (value1: unknown, value2: unknown) => value1 === value2
);
handlebars.registerHelper('lower', (str: string) => str?.toLowerCase());
handlebars.registerHelper('upper', (str: string) => str?.toUpperCase());
handlebars.registerHelper(
    'head',
    (str: string, count: number) => str?.substring(0, count)
);
handlebars.registerHelper(
    'tail',
    (str: string, count: number) => str?.substring(str.length - count)
);

class TemplateService {
    async renderTemplate(
        templatePath: string,
        data: Record<string, unknown>,
        options: RuntimeOptions = {}
    ) {
        const template = await fs.readFile(templatePath, 'utf-8');
        const templateData = _.merge(
            {},
            {
                app: config.get('app')
            },
            data
        );
        return handlebars.compile(template)(templateData, options);
    }

    renderTemplateStr(
        templateStr: string,
        data: Record<string, unknown>,
        options: RuntimeOptions = {}
    ) {
        const templateData = _.merge(
            {},
            {
                app: config.get('app')
            },
            data
        );
        return handlebars.compile(templateStr)(templateData, options);
    }
}

export = new TemplateService();