flow like the river

BACK_BACK/node_modules/parcel-bundler/lib/utils/localRequire.js

@@ -0,0 +1,72 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+
+var _slicedToArray2 = _interopRequireDefault(require("@babel/runtime/helpers/slicedToArray"));
+
+var _asyncToGenerator2 = _interopRequireDefault(require("@babel/runtime/helpers/asyncToGenerator"));
+
+const _require = require('path'),
+      dirname = _require.dirname;
+
+const _require2 = require('@parcel/utils'),
+      promisify = _require2.promisify;
+
+const resolve = promisify(require('resolve'));
+
+const installPackage = require('./installPackage');
+
+const getModuleParts = require('./getModuleParts');
+
+const cache = new Map();
+
+function localRequire(_x, _x2) {
+  return _localRequire.apply(this, arguments);
+}
+
+function _localRequire() {
+  _localRequire = (0, _asyncToGenerator2.default)(function* (name, path, triedInstall = false) {
+    let _yield$localResolve = yield localResolve(name, path, triedInstall),
+        _yield$localResolve2 = (0, _slicedToArray2.default)(_yield$localResolve, 1),
+        resolved = _yield$localResolve2[0];
+
+    return require(resolved);
+  });
+  return _localRequire.apply(this, arguments);
+}
+
+function localResolve(_x3, _x4) {
+  return _localResolve.apply(this, arguments);
+}
+
+function _localResolve() {
+  _localResolve = (0, _asyncToGenerator2.default)(function* (name, path, triedInstall = false) {
+    let basedir = dirname(path);
+    let key = basedir + ':' + name;
+    let resolved = cache.get(key);
+
+    if (!resolved) {
+      try {
+        resolved = yield resolve(name, {
+          basedir
+        });
+      } catch (e) {
+        if (e.code === 'MODULE_NOT_FOUND' && !triedInstall) {
+          const packageName = getModuleParts(name)[0];
+          yield installPackage(packageName, path);
+          return localResolve(name, path, true);
+        }
+
+        throw e;
+      }
+
+      cache.set(key, resolved);
+    }
+
+    return resolved;
+  });
+  return _localResolve.apply(this, arguments);
+}
+
+localRequire.resolve = localResolve;
+module.exports = localRequire;