function findInPath(tool) {
    return __awaiter(this, void 0, void 0, function* () {
        if (!tool) {
            throw new Error("parameter 'tool' is required");
        }
        // build the list of extensions to try
        const extensions = [];
        if (ioUtil.IS_WINDOWS && process.env['PATHEXT']) {
            for (const extension of process.env['PATHEXT'].split(path.delimiter)) {
                if (extension) {
                    extensions.push(extension);
                }
            }
        }
        // if it's rooted, return it if exists. otherwise return empty.
        if (ioUtil.isRooted(tool)) {
            const filePath = yield ioUtil.tryGetExecutablePath(tool, extensions);
            if (filePath) {
                return [filePath];
            }
            return [];
        }
        // if any path separators, return empty
        if (tool.includes(path.sep)) {
            return [];
        }
        // build the list of directories
        //
        // Note, technically "where" checks the current directory on Windows. From a toolkit perspective,
        // it feels like we should not do this. Checking the current directory seems like more of a use
        // case of a shell, and the which() function exposed by the toolkit should strive for consistency
        // across platforms.
        const directories = [];
        if (process.env.PATH) {
            for (const p of process.env.PATH.split(path.delimiter)) {
                if (p) {
                    directories.push(p);
                }
            }
        }
        // find all matches
        const matches = [];
        for (const directory of directories) {
            const filePath = yield ioUtil.tryGetExecutablePath(path.join(directory, tool), extensions);
            if (filePath) {
                matches.push(filePath);
            }
        }
        return matches;
    });
}
Returns a list of all occurrences of the given tool on the system path.

@returns   Promise<string[]>  the paths of the tool