src/vs/workbench/api/node/extHostExtensionService.ts/ExtHostExtensionService/$setRemoteEnvironment
class ExtHostExtensionService:	public async $setRemoteEnvironment(env: { [key: string]: string | null }): Promise<void> {
		if (!this._initData.remote.isRemote) {
			return;
		}

		for (const key in env) {
			const value = env[key];
			if (value === null) {
				delete process.env[key];
			} else {
				process.env[key] = value;
			}
		}
	}