Function repositionStateProperty

transforms/class.js:891–925

(initialStateProperty, propertiesAndMethods)

  // to ensure that our property initializers' evaluation order is safe
  const repositionStateProperty = (initialStateProperty, propertiesAndMethods) => {
    const initialStateCollection = j(initialStateProperty);
    const thisCount = initialStateCollection.find(j.ThisExpression).size();
    const safeThisMemberCount = initialStateCollection.find(j.MemberExpression, {
      object: {
        type: 'ThisExpression',
      },
      property: {
        type: 'Identifier',
        name: 'props',
      },
    }).size() + initialStateCollection.find(j.MemberExpression, {
      object: {
        type: 'ThisExpression',
      },
      property: {
        type: 'Identifier',
        name: 'context',
      },
    }).size();

    if (thisCount === safeThisMemberCount) {
      return initialStateProperty.concat(propertiesAndMethods);
    }

    const result = [].concat(propertiesAndMethods);
    let lastPropPosition = result.length - 1;

    while (lastPropPosition >= 0 && result[lastPropPosition].kind === 'method') {
      lastPropPosition--;
    }

    result.splice(lastPropPosition + 1, 0, initialStateProperty[0]);
    return result;
  };

  // if there's no `getInitialState` or the `getInitialState` function is simple
  // (i.e., it's just a return statement) then we don't need a constructor.