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s.js
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s.js
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const fs = require('fs');
const path = require('path');
const util = require('util');
const access = util.promisify(fs.access);
const writeFile = util.promisify(fs.writeFile);
const md5 = require('md5');
const makeDir = require('make-dir');
const { components } = require('../components');
class S {
constructor({ output_dir, path_prefix }) {
this.output_dir = output_dir;
this.path_prefix = path_prefix; // for example: "/previews/92180392ueu093"
//Initialize all components
this.components = {};
// creating components instances
for (const component_name in components) {
this.components[component_name] = new components[component_name](
this
);
}
}
async addOutputFile({ output_subdir, base_name, generator, deps }) {
const hash = md5(JSON.stringify(deps));
let output_filename = base_name.split('.');
output_filename.splice(output_filename.length - 1, 0, hash);
output_filename = output_filename.join('.');
if (output_subdir[0] === '/') {
output_subdir = '.' + output_subdir;
}
const output_path = path.resolve(
this.output_dir,
output_subdir,
output_filename
);
try {
await access(path.resolve(output_path, '..'));
} catch (error) {
if (error.code === 'ENOENT') {
await makeDir(path.resolve(output_path, '..'));
} else throw error;
}
try {
await access(output_path);
} catch (error) {
await writeFile(output_path, await generator());
}
return path.join(this.path_prefix, output_subdir, output_filename);
}
node_require(module_name) {
try {
return require(module_name);
} catch (e) {
console.error(e);
throw new Error(
`Could not resolve module '${module_name}'. It might not be installed or you're running the s.node_require function in the browser, while it's only supposed to be called on backend side`
);
}
}
}
module.exports = S;

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