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resolveGenericTypeAnnotation.js
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resolveGenericTypeAnnotation.js
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/*
* Copyright (c) 2015, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @flow
*
*/
import isUnreachableFlowType from '../utils/isUnreachableFlowType';
import recast from 'recast';
import resolveToValue from '../utils/resolveToValue';
import { unwrapUtilityType } from './flowUtilityTypes';
const {
types: { namedTypes: types },
} = recast;
function tryResolveGenericTypeAnnotation(path: NodePath): ?NodePath {
let typePath = unwrapUtilityType(path);
if (types.GenericTypeAnnotation.check(typePath.node)) {
typePath = resolveToValue(typePath.get('id'));
if (isUnreachableFlowType(typePath)) {
return;
}
return tryResolveGenericTypeAnnotation(typePath.get('right'));
}
return typePath;
}
/**
* Given an React component (stateless or class) tries to find the
* flow type for the props. If not found or not one of the supported
* component types returns undefined.
*/
export default function resolveGenericTypeAnnotation(
path: NodePath,
): ?NodePath {
if (!path) return;
const typePath = tryResolveGenericTypeAnnotation(path);
if (!typePath || typePath === path) return;
return typePath;
}