import * as Blockly from 'blockly/core';
Blockly.inject('blocklyDiv', {
    ...
})

// Access Blockly.
Blockly.thing;
// Access the default blocks.
Blockly.Blocks['block_type'];
// Access the javascript generator.
javascript.javascriptGenerator;

// Import Blockly core.
import * as Blockly from 'blockly/core';
// Import the default blocks.
import * as libraryBlocks from 'blockly/blocks';
// Import a generator.
import {javascriptGenerator} from 'blockly/javascript';
// Import a message file.
import * as En from 'blockly/msg/en';

// Require Blockly core.
const Blockly = require('blockly/core');
// Require the default blocks.
const libraryBlocks = require('blockly/blocks');
// Require a generator.
const {javascriptGenerator} = require('blockly/javascript');
// Require a message file.
const En = require('blockly/msg/en');

Blockly.setLocal(En);