create-expo-cljs-app/template/node_modules/metro/src/node-haste/ModuleCache.js.flow

Create a react native application with Expo and Shadow-CLJS!

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 * @format
 */

'use strict';

const Module = require('./Module');
const Package = require('./Package');

type GetClosestPackageFn = (filePath: string) => ?string;

class ModuleCache {
  _getClosestPackage: GetClosestPackageFn;
  _moduleCache: {
    [filePath: string]: Module,
    __proto__: null,
    ...
  };
  _packageCache: {
    [filePath: string]: Package,
    __proto__: null,
    ...
  };
  _packageModuleMap: WeakMap<Module, string>;

  constructor(options: {getClosestPackage: GetClosestPackageFn, ...}) {
    this._getClosestPackage = options.getClosestPackage;
    this._moduleCache = Object.create(null);
    this._packageCache = Object.create(null);
    this._packageModuleMap = new WeakMap();
  }

  getModule(filePath: string): Module {
    if (!this._moduleCache[filePath]) {
      this._moduleCache[filePath] = new Module(filePath, this);
    }
    return this._moduleCache[filePath];
  }

  getPackage(filePath: string): Package {
    if (!this._packageCache[filePath]) {
      this._packageCache[filePath] = new Package({
        file: filePath,
      });
    }
    return this._packageCache[filePath];
  }

  getPackageForModule(module: Module): ?Package {
    let packagePath = this._packageModuleMap.get(module);
    if (packagePath) {
      if (this._packageCache[packagePath]) {
        return this._packageCache[packagePath];
      } else {
        this._packageModuleMap.delete(module);
      }
    }

    packagePath = this._getClosestPackage(module.path);
    if (!packagePath) {
      return null;
    }

    this._packageModuleMap.set(module, packagePath);
    return this.getPackage(packagePath);
  }

  processFileChange(type: string, filePath: string) {
    if (this._moduleCache[filePath]) {
      this._moduleCache[filePath].invalidate();
      delete this._moduleCache[filePath];
    }
    if (this._packageCache[filePath]) {
      this._packageCache[filePath].invalidate();
      delete this._packageCache[filePath];
    }
  }
}

module.exports = ModuleCache;