@bitblit/ratchet-epsilon-common/lib/open-api-util/yaml-combiner.js

Tiny adapter to simplify building API gateway Lambda APIS

import fs from 'fs';
import { RequireRatchet } from '@bitblit/ratchet-common/lang/require-ratchet';
import yaml from 'js-yaml';
import { Logger } from '@bitblit/ratchet-common/logger/logger';
export class YamlCombiner {
    static combine(files, inRootPath = []) {
        RequireRatchet.notNullOrUndefined(files, 'Files argument');
        RequireRatchet.true(files.length > 0, 'Files argument larger than 0');
        RequireRatchet.notNullOrUndefined(inRootPath, 'Root path argument');
        Logger.info('Processing %d files into output', files.length);
        let allElements = {};
        for (const fName of files) {
            const fileContents = fs.readFileSync(fName).toString();
            const openApi = yaml.load(fileContents);
            allElements = Object.assign(allElements, openApi);
        }
        const rootPath = Object.assign([], inRootPath);
        while (rootPath.length > 0) {
            const next = {};
            next[rootPath[rootPath.length - 1]] = allElements;
            rootPath.splice(rootPath.length - 1, 1);
            allElements = next;
        }
        const rval = yaml.dump(allElements);
        return rval;
    }
}
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