/
resolveGenericTypeAnnotation.js
64 lines (52 loc) · 1.68 KB
/
resolveGenericTypeAnnotation.js
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @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);
let idPath;
if (typePath.node.id) {
idPath = typePath.get('id');
} else if (types.TSTypeReference.check(typePath.node)) {
idPath = typePath.get('typeName');
} else if (types.TSExpressionWithTypeArguments.check(typePath.node)) {
idPath = typePath.get('expression');
}
if (idPath) {
typePath = resolveToValue(idPath);
if (isUnreachableFlowType(typePath)) {
return;
}
if (types.TypeAlias.check(typePath.node)) {
return tryResolveGenericTypeAnnotation(typePath.get('right'));
} else if (types.TSTypeAliasDeclaration.check(typePath.node)) {
return tryResolveGenericTypeAnnotation(typePath.get('typeAnnotation'));
}
return typePath;
}
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;
}