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how to require constants which is exported in ES6 module?

The original variables are exported in ES6 module like this:
export const url = 'https://example.com/api'
I know I can use this variable using
import {url} from 'src/api'
But the thing is I can't use import in gatsby-config.js file and only can use ES5 syntax.
I tried like this:
const {url} = require('src/api')
but it doesn't work and get errors while gatsby develop
The error is following:
export const url = 'https://example.com/api'
^^^^^^
SyntaxError: Unexpected token 'export'
- v8-compile-cache.js:226 NativeCompileCache._moduleCompile
[project]/[v8-compile-cache]/v8-compile-cache.js:226:18
- v8-compile-cache.js:172 Module._compile
[project]/[v8-compile-cache]/v8-compile-cache.js:172:36
- loader.js:995 Object.Module._extensions..js
internal/modules/cjs/loader.js:995:10
- loader.js:815 Module.load
internal/modules/cjs/loader.js:815:32
- loader.js:727 Function.Module._load
internal/modules/cjs/loader.js:727:14
- loader.js:852 Module.require
internal/modules/cjs/loader.js:852:19
- v8-compile-cache.js:159 require
[project]/[v8-compile-cache]/v8-compile-cache.js:159:20
- gatsby-config.js:4 Object.<anonymous>
C:/project/gatsby-config.js:4:26
- v8-compile-cache.js:178 Module._compile
[project]/[v8-compile-cache]/v8-compile-cache.js:178:30
- loader.js:995 Object.Module._extensions..js
internal/modules/cjs/loader.js:995:10
- loader.js:815 Module.load
internal/modules/cjs/loader.js:815:32
- loader.js:727 Function.Module._load
internal/modules/cjs/loader.js:727:14
- loader.js:852 Module.require
internal/modules/cjs/loader.js:852:19
- v8-compile-cache.js:159 require
[project]/[v8-compile-cache]/v8-compile-cache.js:159:20
- get-config-file.js:33 getConfigFile
[project]/[gatsby]/dist/bootstrap/get-config-file.js:33:20

When you exporting your constant if you use module.exports it should not give this error. Do it like this:
const yourUrl = 'https://example.com/api'
module.exports = { url: yourUrl }

Hope you know what you are trying to achieve because the result produces anti pattern against gatsbyjs specification as it already converts code internally from es6 to es5 after reading and validating gatsby-config.js.
So, try this way to require constants in gatsby-config.js which were exported in es6 module
From es6 to es5 conversion, install #babel/cli and #babel/core package i.e npm install #babel/cli #babel/core --save-dev
Add new npm/yarn script in package.json -> scripts -> "prepare_config" : "NODE_ENV=test babel ./gatsby-config.js <LIST_OF_FILES_TO_CONVERT> --out-dir ./"
Make sure babel-preset-gatsby directory is present under node_modules if not then install it i.e. npm install babel-preset-gatsby --save-dev
Either add .babelrc in project root directory having below code for babel preset and conversion.
{
"presets": [
[
"babel-preset-gatsby",
{
"forceAllTransforms": true,
"useBuiltIns": "usage"
}
]
]
}
OR if you don't want to add .babelrc then specify babel configuration in package.json.
"babel": {
"presets": [
[
"babel-preset-gatsby",
{
"forceAllTransforms": true,
"useBuiltIns": "usage"
}
]
]
}
Now run npm run prepare_config script first for conversion which will import required constants which were exported in ES6 module.
Then you can run gatsby develop successfully.

Change the type:"module" or set in package.json.
{
"name": "server",
"version": "1.0.0",
"type": "module",
"description": "",
"main": "server.js",
"scripts": {
"test": "echo "Error: notestspecified" && exit 1",
"start": "nodemon server.js"
},
"keywords": [
],
"author": "",
"license": "ISC",
"dependencies": {
"#babel/core": "^7.16.5",
"body-parser": "^1.19.1",
"cors": "^2.8.5",
"dotenv": "^10.0.0",
"express": "^4.17.2",
"mongoose": "^6.1.3",
"nodemon": "^2.0.15"
}
}

Change 'import' to 'require', sucrase deployment

I'm trying to put my application into production. But, the teacher who was teaching put it for me, the lib 'sucrase' to use syntax of "import from" instead of "require". Only now Heroku is complaining that he doesn't understand the syntax "import". Is there anything I can do about line of code and configuration? Or do I have to change all "import from" to "require"? ... Lower the logs ...
logs in Heroku
2020-06-27T20:21:41.876688+00:00 app[web.1]: /app/src/server.js:1
2020-06-27T20:21:41.876689+00:00 app[web.1]: import app from './app';
2020-06-27T20:21:41.876690+00:00 app[web.1]: ^^^^^^
2020-06-27T20:21:41.876690+00:00 app[web.1]:
2020-06-27T20:21:41.876691+00:00 app[web.1]: SyntaxError: Cannot use import statement outside a module
2020-06-27T20:21:41.876691+00:00 app[web.1]: at wrapSafe (internal/modules/cjs/loader.js:1054:16)
2020-06-27T20:21:41.876692+00:00 app[web.1]: at Module._compile (internal/modules/cjs/loader.js:1102:27)
My package.json
{
"name": "futs",
"version": "1.0.0",
"main": "index.js",
"license": "MIT",
"scripts": {
"start": "nodemon src/server.js",
/ ^ ^ ^ Below at the code is a configuration about the 'nodemon' that the teacher gave me
"dev:debug": "nodemon --inspect src/server.js"
},
"dependencies": {
"aws-sdk": "^2.704.0",
"bcryptjs": "^2.4.3",
"body-parser": "^1.19.0",
"cors": "^2.8.5",
"date-fns": "^2.14.0",
"dotenv": "^8.2.0",
"express": "^4.17.1",
"jsonwebtoken": "^8.5.1",
"multer": "^1.4.2",
"multer-s3": "^2.9.0",
"nodemailer": "^6.4.10",
"pg": "^8.2.1",
"sequelize": "^5.21.13",
"sequelize-cli": "^5.5.1",
"uuid": "^8.1.0",
"yup": "^0.29.1"
},
"devDependencies": {
"eslint": "^6.8.0",
"eslint-config-airbnb-base": "^14.1.0",
"eslint-config-prettier": "^6.11.0",
"eslint-plugin-import": "^2.20.2",
"eslint-plugin-prettier": "^3.1.3",
"nodemon": "^2.0.4",
"prettier": "^2.0.5",
"sucrase": "^3.15.0"
}
}
nodemon.json
{
"execMap":{
"js": "node -r sucrase/register"
}
}
I don't know how to run to deploy, if anyone can help me

As you see in the error log : Cannot use import statement outside a module.
import statements are permitted only in ES modules not CommonJS see more about that here :
However you can make Node treat your file as a ES module you need to :
add "type": "module" to package.json .
Add --experimental-modules flag upon running your app(not necessary with Node 13.2.0+ so check your node version with node --version)
as follow :
// package.json
{
"type": "module"
}
take a look here for more information .
OR :
Alternatively you can use the .mjs instead of .jsextension .
SOURCES :
SyntaxError: Cannot use import statement outside a module
https://nodejs.org/api/esm.html .
https://nodejs.org/api/esm.html#esm_enabling .
https://nodejs.org/api/esm.html#esm_code_import_code_statements

To build my app using sucrase I use:
sucrase ./src -d ./dist --transforms imports
This is my package.json file:
"scripts": {
"dev": "nodemon src/server.js",
"build": "sucrase ./src -d ./dist --transforms imports",
"start": "node dist/server.js"
},

How to use "import" in Node.js?

I tried to deploy my project developed using React and Node.js to Heroku, but after issuing git push heroku master, I got an error:
2020-06-05T02:12:18.092681+00:00 app[web.1]: import express from "express";
2020-06-05T02:12:18.092682+00:00 app[web.1]: ^^^^^^^
2020-06-05T02:12:18.092682+00:00 app[web.1]:
2020-06-05T02:12:18.092683+00:00 app[web.1]: SyntaxError: Unexpected identifier
2020-06-05T02:12:18.092683+00:00 app[web.1]: at Module._compile (internal/modules/cjs/loader.js:718:23)
I googled and it is said that Node.js doesn't support ES6 syntax, and I can solve it by using babel.
But I don't know how to configure it.
Below are my files:
.babelrc.json:
{
"presets": [
[
"#babel/preset-env",
{
"targets": {
"node": "current"
}
}
]
]
}
package.json:
{
"name": "react_e-commerce",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"start": "nodemon --watch backend --exec babel-node backend/server.js",
"build": "rimraf dist && babel backend -d dist",
"heroku-postbuild": "npm run build && cd e-commerce && npm install && npm run build"
},
"author": "",
"license": "ISC",
"dependencies": {
"body-parser": "^1.19.0",
"dotenv": "^8.2.0",
"express": "^4.17.1",
"jsonwebtoken": "^8.5.1",
"mongoose": "^5.9.16"
},
"devDependencies": {
"#babel/cli": "^7.10.1",
"#babel/core": "^7.10.1",
"#babel/node": "^7.10.1",
"#babel/preset-env": "^7.10.1",
"babel-cli": "^6.26.0",
"mkdirp": "^1.0.4",
"nodemon": "^2.0.4",
"rimraf": "^3.0.2"
},
"engines": {
"node": "12.4.0",
"npm": "6.9.0"
}
}
And my whole project is on https://github.com/powerseed/e-commerce-React
The e-commerce folder is for frontend.
Thanks in advance!

You can just use require if you want. Here are the details on why there are two ways to bring in files. The difference between "require(x)" and "import x"

per the Nodejs docs I was able to use the following to run node node-module.js and similar may work in your situation--I'm unfamiliar with the specific node version you're working with currently, but the "type":"module" option would likely allow it--I'm using Nodejs v15 at the moment.
package.json
{
"type": "module"
}
node-module.js
import * as os from 'os';
import defaultstuff, { stuff } from './node-import-stuff.js';
console.log(123 === stuff, defaultstuff, Object.keys(os));
node-import-stuff.js
export const stuff = 123;
export default stuff;

Babel not transpiling npm link/symlink package source code

I´m setting up a shared module environment using node. Here is my directory structure:
project
|--common
| |--package.json
| |--graphql
| |----schema.js
|
|--server
|--package.json
|--server.js
Linking both projects:
$ cd project\common
$ npm link
Then:
$ cd ../server
$ npm link common
common Package.json file:
{
"name": "common",
"private": true,
"version": "3.0.0",
"description": "Common code for all projects",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "Me",
"license": "MIT"
}
server package.json file:
{
"name": "server",
"version": "1.0.0",
"private": true,
"scripts": {
"start": "concurrently \"babel-node start-server\" \"babel-node start-client\"",
"server": "nodemon --exec \"babel-node start-server.js\"",
"client": "nodemon --exec \"babel-node start-client.js\"",
"lint": "eslint ."
},
"dependencies": {
"babel-cli": "^6.24.1",
"babel-core": "^6.25.0",
"babel-plugin-transform-runtime": "^6.23.0",
"babel-preset-es2015": "^6.24.1",
"babel-preset-es2016": "^6.24.1",
"babel-preset-es2017": "^6.24.1",
"babel-preset-stage-0": "^6.24.1",
"bcryptjs": "^2.4.3",
"body-parser": "^1.17.2",
"common": "file:../common",
"connect-mongo": "^2.0.0",
"crypto": "^1.0.1",
"express": "^4.15.3",
"express-graphql": "^0.6.12",
"graphql": "^0.13.1",
"graphql-relay": "^0.5.4",
"jwt-simple": "^0.5.1",
"mongoose": "^5.0.10",
"morgan": "^1.8.2",
"nodemailer": "^4.6.0",
"passport": "^0.4.0",
"passport-jwt": "^4.0.0",
"path": "^0.12.7",
"validator": "^9.1.1"
},
"devDependencies": {
"concurrently": "3.5.1",
"eslint": "^4.18.2",
"eslint-config-airbnb": "16.1.0",
"eslint-plugin-import": "2.9.0",
"eslint-plugin-jsx-a11y": "6.0.3",
"eslint-plugin-react": "7.7.0",
"fs-extra": "^5.0.0",
"node-fetch": "^2.1.1",
"nodemon": "^1.11.0"
},
"babel": {
"presets": [
"es2015",
"stage-0",
"es2017"
],
"plugins": [
"transform-runtime"
]
}
}
Server.js code:
import schema from "common/graphql/schema";
...
Running server application:
$ npm run server
import { GraphQLSchema } from 'graphql';
^^^^^^
SyntaxError: Unexpected token import
at Object.exports.runInThisContext (vm.js:76:16)
at Module._compile (module.js:542:28)
at loader (D:\project\server\node_modules\babel-register\lib\node.js:144:5)
at Object.require.extensions.(anonymous function) [as .js] (D:\project\server\node_modules\babel-register\lib\node.js:154:7)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.require (module.js:497:17)
at require (internal/module.js:20:19)
at Object.<anonymous> (D:/9. DEV/WORKSPACE/amplifactory/server/routes.js:25:1)
at Module._compile (module.js:570:32)
at loader (D:\project\server\node_modules\babel-register\lib\node.js:144:5)
at Object.require.extensions.(anonymous function) [as .js] (D:\project\server\node_modules\babel-register\lib\node.js:154:7)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
[nodemon] app crashed - waiting for file changes before starting...
From what I´ve seen that is not transpiling code outside server directory, but without putting common ouside server directory I cannot build my shared code.
How to solve this babel issue and make it transpile correctly ?

You aren't going to like it, and maybe there is a better answer in spring 2018, but you may need to have a separate build step for your common code. I have a similar project where the package.json file for the common code looks something like this:
{
"name": "stripmall_gcloud_services",
"version": "1.0.0",
"description": "wraps up some commonly used google helpers",
"main": "./dist/index.js",
"scripts": {
"test": "standard --fix && mocha -r babel-register",
"build": "babel lib -d dist"
}...}
Notice the npm build step that transpiles the common code, and notice that the main key points to the index.js file in the transpiled directory. You just run npm run build whenever you update your common code and all your linking will work as you would expect.

Missing basic DOM types in TypeScript project

I am setting a web app up in TypeScript and I seem to be missing some basic types I need.
When I compile (npm run build), I get the following errors,
error TS2304: Cannot find name 'HTMLElement'.
error TS2304: Cannot find name 'SVGElement'.
error TS2304: Cannot find name 'EventTarget'.
error TS2304: Cannot find name 'TouchEvent'.
error TS2304: Cannot find name 'MouseEvent'.
error TS2304: Cannot find name 'PointerEvent'.
Based on my Googling I assuming I am missing something basic in my project setup. It seems like these types are just assumed to be there with Typescript.
EDIT: Specially it should be part of the ES6 types, https://github.com/Microsoft/TypeScript/blob/master/lib/lib.es6.d.ts.
Here is my package.json file:
{
"name": "wip",
"version": "1.0.0",
"description": "",
"main": "index.html",
"dependencies": {
"hammerjs": "2.0.8"
},
"devDependencies": {
"#types/chai": "3.4.35",
"#types/mocha": "2.2.39",
"#types/node": "7.0.5",
"#types/hammerjs": "2.0.34",
"chai": "3.5.0",
"mocha": "3.2.0",
"safe-mock": "0.2.0",
"ts-node": "2.1.0",
"tslint": "4.5.1",
"typescript": "2.2.1",
"webpack": "^2.2.1",
"webpack-dev-server": "^2.4.1"
},
"scripts": {
"test": "mocha test --require ts-node/register test/**/*.ts && npm run build",
"dev": "webpack-dev-server --watch --content-base . -d --progress",
"build": "tsc"
},
"author": "",
"license": "ISC"
}
Any suggestions?

Try adding the following lib section to your tsconfig.json file.
{
"compilerOptions": {
"lib": [
"es2016",
"dom"
]
}
}

Additional answer for testing.
If using mocha, you also need to tell mocha about the DOM environment using jsdom.
https://journal.artfuldev.com/unit-testing-node-applications-with-typescript-using-mocha-and-chai-384ef05f32b2
$ npm install jsdom jsdom-global --save-dev
So your "test" script would add -r jsdom-global/register:
{
"scripts": {
"test": "mocha test -r ts-node/register -r jsdom-global/register test/**/*.ts && npm run build"
}
}