Javascript vscode扩展开发：vscode.EventEmitter fire添加额外空间

我正在vscode扩展中执行命令，例如command

brew search git

import * as cp from 'child_process';
import * as workspace from './util/workspace';

const util = require('util');
const exec = util.promisify(cp.exec);

// Execute a given command and returns result as string or error
async function execute(cmd: string): Promise<string | Error> {
    let path = workspace.getWorkspacePath();

    const { stdout, stderr } = await exec(cmd, { cwd: path });
    if (stderr) { return new Error(stderr); }
    return stdout;
}

如何使终端在不增加额外空间的情况下打印输出

export default class CustomTaskTerminal implements vscode.Pseudoterminal {
    private writeEmitter = new vscode.EventEmitter<string>();
    onDidWrite: vscode.Event<string> = this.writeEmitter.event;
    private closeEmitter = new vscode.EventEmitter<number>();
    onDidClose?: vscode.Event<number> = this.closeEmitter.event;

    constructor() { }

    open(initialDimensions: vscode.TerminalDimensions | undefined): void {
        this.runCustomTask();
    }

    close(): void { }

    fireWrite(data: string): void {
        this.writeEmitter.fire(data + '\n');
    }

    fireClose(data: number): void {
        this.closeEmitter.fire(data);
    }

    private async runCustomTask(): Promise<void> {
        var self = this;

        var ex = execute('brew search git')
        ex.then(function(res){
            if (typeof res === 'string') {
                self.fireWrite(res);
                self.fireClose(1);
            }
        }).catch(function(err) {
            self.fireWrite(err);
            self.fireClose(0);
            return;
        })
    }
}