eslint-plugin-ft-flow/dist/rules/typeColonSpacing/evaluateObjectTypeProperty.js.flow

Flowtype linting rules for ESLint by flow-typed

import {
  getParameterName, quoteName,
} from '../../utilities';

const getColon = (context, objectTypeProperty) => {
  let tokenIndex = 1;

  if (objectTypeProperty.optional) {
    tokenIndex += 1;
  }

  if (objectTypeProperty.static) {
    tokenIndex += 1;
  }

  if (objectTypeProperty.variance) {
    tokenIndex += 1;
  }

  return context.getSourceCode().getFirstToken(objectTypeProperty, tokenIndex);
};

// 1) type X = { foo(): A; }
// 2) type X = { foo: () => A; }
// the above have identical ASTs (save for their ranges)
// case 1 doesn't have a type annotation colon and must be ignored
const isShortPropertyFunction = (objectTypeProperty) => objectTypeProperty.value.type === 'FunctionTypeAnnotation' && objectTypeProperty.range[0] === objectTypeProperty.value.range[0];

export default (context, report) => (objectTypeProperty) => {
  if (isShortPropertyFunction(objectTypeProperty)) {
    // potential difference: not checked in before
    return;
  }

  report({
    colon: getColon(context, objectTypeProperty),
    name: quoteName(getParameterName(objectTypeProperty, context)),
    node: objectTypeProperty,
  });
};