Import syntax variations in Typescript - Time & Space Complexity

Time Complexity: Import syntax variations

O(1)

Understanding Time Complexity

We want to understand how the time it takes to run code changes when using different import styles in TypeScript.

Specifically, we ask: Does choosing one import style over another affect how long the program takes to start or run?

Scenario Under Consideration

Analyze the time complexity of these import statements.

import { funcA } from './moduleA';
import * as Utils from './utils';
import defaultExport from './defaultModule';

function run() {
  funcA();
  Utils.helper();
  defaultExport();
}
run();
    

This code imports functions in different ways and then calls them.

Identify Repeating Operations

Look for repeated actions that take time.

• Primary operation: Importing modules happens once at the start.
• How many times: Each import runs once before the program runs.

How Execution Grows With Input

Importing modules is a fixed cost that does not grow with input size.

Input Size (n)	Approx. Operations
10	Same fixed cost for imports
100	Same fixed cost for imports
1000	Same fixed cost for imports

Pattern observation: Import time stays the same no matter how many times functions are called later.

Final Time Complexity

Time Complexity: O(1)

This means importing modules takes a constant amount of time regardless of program size.

Common Mistake

[X] Wrong: "Using different import styles changes how fast the program runs as it grows."

[OK] Correct: Importing happens once before running, so the style does not affect growth with input size.

Interview Connect

Understanding import timing helps you explain how code loads and runs efficiently, a useful skill in many coding situations.

Self-Check

"What if we dynamically import modules inside a loop? How would the time complexity change?"