From v3.x, simple-git will drop support for node.js version 10 or below.
From v3.8, simple-git will no longer be tested against node version 12 or below.
To use in lower versions of node, ensure you are also including the necessary polyfills from core-js:
require('core-js/stable/array/flat-map');
require('core-js/stable/object/from-entries');
require('core-js/stable/object/from-entries');
const simpleGit = require('simple-git');import 'core-js/stable/array/flat-map';
import 'core-js/stable/object/from-entries';
import 'core-js/stable/object/from-entries';
import simpleGit, { SimpleGit } from 'simple-git';
const git: SimpleGit = simpleGit();