git ssb

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import { core, sync } from 'resolve';
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import assert from 'assert';
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import fs from 'fs';
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import path from 'path';
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Object.keys(core).forEach((key) => {
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  // 'resolve' hardcodes the list to host's one, but i need
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  // to be able to allow 'worker_threads' (target 12) on host 8
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  assert(typeof core[key] === 'boolean');
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  core[key] = true;
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});
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export const natives = core;
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const PROOF = 'a-proof-that-main-is-captured.js';
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function parentDirectoriesContain (parent, directory) {
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  while (true) {
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    if (parent === directory) return true;
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    const newParent = path.dirname(parent);
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    if (newParent === parent) return false;
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    parent = newParent;
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  }
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}
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export function follow (x, opts) {
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  // TODO async version
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  return new Promise((resolve) => {
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    resolve(sync(x, {
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      basedir: opts.basedir,
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      extensions: opts.extensions,
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      isFile: (file) => {
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        if (opts.ignoreFile && path.join(path.dirname(opts.ignoreFile), PROOF) === file) return true;
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        let stat;
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        try {
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          stat = fs.statSync(file);
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        } catch (e) {
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          if (e && (e.code === 'ENOENT' || e.code === 'ENOTDIR')) return false;
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          throw e;
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        }
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        return stat.isFile() || stat.isFIFO();
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      },
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      isDirectory: (directory) => {
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        if (opts.ignoreFile && parentDirectoriesContain(opts.ignoreFile, directory)) return false;
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        let stat;
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        try {
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          stat = fs.statSync(directory);
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        } catch (e) {
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          if (e && (e.code === 'ENOENT' || e.code === 'ENOTDIR')) return false;
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          throw e;
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        }
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        return stat.isDirectory();
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      },
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      readFileSync: (file) => {
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        if (opts.ignoreFile && opts.ignoreFile === file) return Buffer.from(`{"main":"${PROOF}"}`);
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        if (opts.readFile) opts.readFile(file);
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        return fs.readFileSync(file);
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      },
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      packageFilter: (config, base) => {
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        if (opts.packageFilter) opts.packageFilter(config, base);
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        return config;
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      }
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    }));
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  });
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}
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