reselector/utils.js

'use strict';

const path = require('path');
const hash = require('string-hash');

const projectPath = process.cwd();

module.exports.getNode = (t, p) => {
  const { node, parent } = p;

  switch (parent.type) {
    case 'ReturnStatement':
    case 'ArrowFunctionExpression':
      {
        const { openingElement } = node;
        const { name } = openingElement.name;

        if (!name) return null;

        let currentPath = p;

        do {
          currentPath = currentPath.parentPath;

          if (!currentPath) return null;

          let componentNode = currentPath.node;

          switch (currentPath.type) {
            case 'VariableDeclaration':
              {
                [componentNode] = currentPath.node.declarations;
              }
            // falls through
            case 'ClassDeclaration':
            case 'ExportDefaultDeclaration':
            case 'ExportNamedDeclaration':
            case 'FunctionDeclaration':
              {
                if (currentPath.parent.type === 'ExportNamedDeclaration') {
                  currentPath = currentPath.parentPath;
                }

                return { rootPath: currentPath, componentNode, openingElement };
              }
          }
        } while (currentPath);
      }
  }

  return null;
};

module.exports.getName = ({ rootPath, componentNode }) => rootPath.type === 'ExportDefaultDeclaration' ? 'default' : componentNode.id.name;

module.exports.getId = (filename, name) => hash(`${path.relative(projectPath, filename)}:${name}`).toString(16);