I can't seem to get "getMiniflareBindings()" to work?

[tokenhousetopdev]

In the blog example you can use getMiniflareBindings() to get access to the global env variables. I am trying to do the same thing in my project but can't replicate the functionality.

bindings.d.ts file:

export interface Bindings {
  ENV: string
  MYSQL_URL: string
  JWT_SECRET: string
  JWT_ACCESS_EXPIRATION_MINUTES: number
  JWT_REFRESH_EXPIRATION_DAYS: number
  JWT_RESET_PASSWORD_EXPIRATION_MINUTES: number
  JWT_VERIFY_EMAIL_EXPIRATION_MINUTES: number
}

declare global {
  function getMiniflareBindings(): Bindings
}

Trying to use it:

const env = getMiniflareBindings()

Error:

ReferenceError: getMiniflareBindings is not defined

build.js:

import { build } from 'esbuild'

try {
  await build({
      entryPoints: ['./src/index.ts'],
      bundle: true,
      outdir: './dist/',
      sourcemap: true,
      minify: true
    })
} catch(err) {
  process.exitCode = 1;
}

tsconfig.json:

{
  "compilerOptions": {
    "allowJs": true,
    "target": "esnext",
    "lib": ["esnext"],
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "inlineSourceMap": true,
    "module": "esnext",
    "esModuleInterop": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "strict": true,
    "noImplicitAny": true,
    "noEmit": true,
    "types": [
      "@cloudflare/workers-types",
      "@types/bcryptjs"
    ]
  },
  "ts-node": {
    "transpileOnly": true
  },
  "include": ["./src/**/*", "bindings.d.ts"]
}

Any idea what I am doing wrong?