Alias import

Basic Imports

syntax

import module
from module import name
import module as alias

example

import json
from pathlib import Path
from collections import defaultdict, Counter
import numpy as np  # common alias convention

data = json.dumps({"key": "value"})
print(data)

output

{"key": "value"}

Note Convention: standard library imports first, then third-party, then local. Separate groups with a blank line. Use isort to auto-format.

TSTypeScript

paths & baseUrl

TS · Configuration

syntax

{
  "compilerOptions": {
    "baseUrl": ".",
    "paths": {
      "@alias/*": ["src/folder/*"]
    }
  }
}

example

// tsconfig.json
{
  "compilerOptions": {
    "baseUrl": ".",
    "paths": {
      "@components/*": ["src/components/*"],
      "@utils/*": ["src/utils/*"],
      "@api/*": ["src/api/*"],
      "@types/*": ["src/types/*"]
    }
  }
}

// In your code:
import { Button } from "@components/Button";
import { formatDate } from "@utils/date";
import type { User } from "@types/user";

output

// Path aliases shorten deep relative imports like ../../../../utils

Note paths only affects TypeScript's type resolution — it does NOT rewrite imports in emitted JS. Your bundler (Vite, webpack) or runtime (ts-node, tsx) needs matching alias config. For Node.js, package.json "imports" with subpath patterns is the modern alternative that works without bundler config.

PYPython

TSTypeScript