/
getPropertyName.js
62 lines (52 loc) · 1.7 KB
/
getPropertyName.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 recast from 'recast';
import getNameOrValue from './getNameOrValue';
import resolveToValue from './resolveToValue';
const {
types: { namedTypes: types },
} = recast;
export const COMPUTED_PREFIX = '@computed#';
/**
* In an ObjectExpression, the name of a property can either be an identifier
* or a literal (or dynamic, but we don't support those). This function simply
* returns the value of the literal or name of the identifier.
*/
export default function getPropertyName(propertyPath: NodePath): ?string {
if (types.ObjectTypeSpreadProperty.check(propertyPath.node)) {
return getNameOrValue(propertyPath.get('argument').get('id'), false);
} else if (propertyPath.node.computed) {
const key = propertyPath.get('key');
// Try to resolve variables and member expressions
if (
types.Identifier.check(key.node) ||
types.MemberExpression.check(key.node)
) {
const value = resolveToValue(key).node;
if (
types.Literal.check(value) &&
(typeof value.value === 'string' || typeof value.value === 'number')
) {
return `${value.value}`;
}
}
// generate name for identifier
if (types.Identifier.check(key.node)) {
return `${COMPUTED_PREFIX}${key.node.name}`;
}
if (
types.Literal.check(key.node) &&
(typeof key.node.value === 'string' || typeof key.node.value === 'number')
) {
return `${key.node.value}`;
}
return null;
}
return getNameOrValue(propertyPath.get('key'), false);
}