Method replacePattern

bin/yarn-standalone.js:76905–76913

* replace pattern in resolver, e.g. `name` is replaced with `name@^1.0.1`

(pattern, newPattern)

   * replace pattern in resolver, e.g. `name` is replaced with `name@^1.0.1`
   */
  replacePattern(pattern, newPattern) {
    const pkg = this.getResolvedPattern(pattern);
    invariant(pkg, `missing package ${pattern}`);
    const ref = pkg._reference;
    invariant(ref, 'expected package reference');
    ref.patterns = [newPattern];
    this.addPattern(newPattern, pkg);
    this.removePattern(pattern);
  }

  /**
   * Make all versions of this package resolve to it.