function tryGetExecutablePath(filePath, extensions) {
    return __awaiter(this, void 0, void 0, function* () {
        let stats = undefined;
        try {
            // test file exists
            stats = yield exports.stat(filePath);
        }
        catch (err) {
            if (err.code !== 'ENOENT') {
                // eslint-disable-next-line no-console
                console.log(`Unexpected error attempting to determine if executable file exists '${filePath}': ${err}`);
            }
        }
        if (stats && stats.isFile()) {
            if (exports.IS_WINDOWS) {
                // on Windows, test for valid extension
                const upperExt = path.extname(filePath).toUpperCase();
                if (extensions.some(validExt => validExt.toUpperCase() === upperExt)) {
                    return filePath;
                }
            }
            else {
                if (isUnixExecutable(stats)) {
                    return filePath;
                }
            }
        }
        // try each extension
        const originalFilePath = filePath;
        for (const extension of extensions) {
            filePath = originalFilePath + extension;
            stats = undefined;
            try {
                stats = yield exports.stat(filePath);
            }
            catch (err) {
                if (err.code !== 'ENOENT') {
                    // eslint-disable-next-line no-console
                    console.log(`Unexpected error attempting to determine if executable file exists '${filePath}': ${err}`);
                }
            }
            if (stats && stats.isFile()) {
                if (exports.IS_WINDOWS) {
                    // preserve the case of the actual file (since an extension was appended)
                    try {
                        const directory = path.dirname(filePath);
                        const upperName = path.basename(filePath).toUpperCase();
                        for (const actualName of yield exports.readdir(directory)) {
                            if (upperName === actualName.toUpperCase()) {
                                filePath = path.join(directory, actualName);
                                break;
                            }
                        }
                    }
                    catch (err) {
                        // eslint-disable-next-line no-console
                        console.log(`Unexpected error attempting to determine the actual case of the file '${filePath}': ${err}`);
                    }
                    return filePath;
                }
                else {
                    if (isUnixExecutable(stats)) {
                        return filePath;
                    }
                }
            }
        }
        return '';
    });
}
Best effort attempt to determine whether a file exists and is executable.
@param filePath    file path to check
@param extensions  additional file extensions to try
@return if file exists and is executable, returns the file path. otherwise empty string.