@atomist/sdm-core/src/lib/util/misc/array.ts

/*
 * Copyright © 2019 Atomist, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

export function toArray<T>(value: T | T[]): T[] {
    if (!!value) {
        if (Array.isArray(value)) {
            return value;
        } else {
            return [value];
        }
    } else {
        return undefined;
    }
}