Front — Fix circular dependencies

fix-circular-deps.js

// Note: this replaces module.exports = ... with something like Object.assign(module.exports, AnalyticsSavedViewResource)
// This doesn't work but this was a worthwhile experiment and we can reuse this code as a base.

module.exports = function (file, api, options) {
  const j = api.jscodeshift;
  const root = j(file.source);

  fixTopLevelAssignments(j, root);
  fixTopLevelChainedAssignments(j, root);

  return root.toSource({quote: 'single'});
};

function fixTopLevelAssignments(j, root) {
  const expressionsToFix = root.find(j.ExpressionStatement, {
    expression : {
      type: 'AssignmentExpression',
      operator: '=',
      left: {
        type: 'MemberExpression',
        object: {
          name: 'module',
          type: 'Identifier'
        },
        property: {
          name: 'exports',
          type: 'Identifier'
        }
      }
    }
  });
  expressionsToFix.forEach(p => {
    const callExpression = j.callExpression(
      j.memberExpression(j.identifier('Object'), j.identifier('assign')),
      [
        j.memberExpression(j.identifier('module'), j.identifier('exports')),
        p.value.expression.right
      ]
    );

    const expressionStatement = j.expressionStatement(callExpression);
    j(p).replaceWith(expressionStatement);
  });
}

function fixTopLevelChainedAssignments(j, root) {
  const expressionsToFix = root.find(j.VariableDeclaration, {
    declarations: [{
      type: 'VariableDeclarator',
      init: {
        type: 'AssignmentExpression',
        operator: '=',
        left: {
          type: 'MemberExpression',
          object: {
            name: 'module',
            type: 'Identifier'
          },
          property: {
            name: 'exports',
            type: 'Identifier'
          }
        }
      }
    }]
  }).filter(p => p.value.declarations.length === 1);

  expressionsToFix.forEach(p => {
    const declPath = p.get('declarations').get(0).get('init');
    j(declPath).replaceWith(p.value.declarations[0].init.right);

    const callExpression = j.callExpression(
      j.memberExpression(j.identifier('Object'), j.identifier('assign')),
      [
        j.memberExpression(j.identifier('module'), j.identifier('exports')),
        p.value.declarations[0].id
      ]
    );

    const expressionStatement = j.expressionStatement(callExpression);
    j(p).insertAfter(expressionStatement);
  });
}