function getExecOutput(commandLine, args, options) {
    var _a, _b;
    return __awaiter(this, void 0, void 0, function* () {
        let stdout = '';
        let stderr = '';
        //Using string decoder covers the case where a mult-byte character is split
        const stdoutDecoder = new string_decoder_1.StringDecoder('utf8');
        const stderrDecoder = new string_decoder_1.StringDecoder('utf8');
        const originalStdoutListener = (_a = options === null || options === void 0 ? void 0 : options.listeners) === null || _a === void 0 ? void 0 : _a.stdout;
        const originalStdErrListener = (_b = options === null || options === void 0 ? void 0 : options.listeners) === null || _b === void 0 ? void 0 : _b.stderr;
        const stdErrListener = (data) => {
            stderr += stderrDecoder.write(data);
            if (originalStdErrListener) {
                originalStdErrListener(data);
            }
        };
        const stdOutListener = (data) => {
            stdout += stdoutDecoder.write(data);
            if (originalStdoutListener) {
                originalStdoutListener(data);
            }
        };
        const listeners = Object.assign(Object.assign({}, options === null || options === void 0 ? void 0 : options.listeners), { stdout: stdOutListener, stderr: stdErrListener });
        const exitCode = yield exec(commandLine, args, Object.assign(Object.assign({}, options), { listeners }));
        //flush any remaining characters
        stdout += stdoutDecoder.end();
        stderr += stderrDecoder.end();
        return {
            exitCode,
            stdout,
            stderr
        };
    });
}
Exec a command and get the output.
Output will be streamed to the live console.
Returns promise with the exit code and collected stdout and stderr

@param     commandLine           command to execute (can include additional args). Must be correctly escaped.
@param     args                  optional arguments for tool. Escaping is handled by the lib.
@param     options               optional exec options.  See ExecOptions
@returns   Promise<ExecOutput>   exit code, stdout, and stderr