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TypeScript - interface naming convention

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In TypeScript interface naming convention contains following rules:

  1. Use PascalCase for interface names.
  2. Use pascalCase for interface members.
  3. Do not use "I" as a prefix for interface names.
  4. Use whole words in names when possible.

Interface naming convention example

interface Square {
    readonly name: string;

    computePerimeter(aSize : number, bSize : number) : number;
    computeArea(aSize: number, bSize: number): number;

    toString(): string;

class LocalSquare implements Square {

    get name() : string {
        return 'Square';
    public computePerimeter(aSize : number, bSize : number) : number {
        return 2 * aSize + 2 * bSize;

    public computeArea(aSize: number, bSize: number): number {
        return aSize * bSize;

    public toString(): string {
        return '[ ' + + ' object ]';

Run it online here.


  1. TypeScript Handbook Interface - Microsoft Github Docs
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