JavaScript: ES6 string method 'repeat' not recognized

Scenario: My environment consists of Windows 10, TypeScript 1.8, and Visual Studio Code 1.0.0. I have the following code snippet:

///<reference path = "./typings/lib.es6.d.ts" />

and later on,

let z = "0".repeat(4 - str.length)

This is where the error occurs.

Visual Studio Code highlights "repeat" with red underlines and displays the following message:

[ts] Property 'repeat' does not exist on type 'string'.

When I compile using the command line:

tsc <filename>.ts

The compiler throws an error at the repeat part in the let z line:

error TS2339: Property 'repeat' does not exist on type 'string'.

In defense, ES2015 (ES6) introduced this feature. So, my question is: How can I successfully compile this code without errors?

Changes Made: Shortened for brevity.

Answer №1

For me, I made a simple change in the tsconfig.json file:

Previous configuration:

"compilerOptions": {
    "target": "es5"
}

New configuration:

"compilerOptions": {
    "target": "es6"
}

Answer №2

My successful approach included:

(1) I eliminated all references to d.ts files and compiled the project. It appeared that some of my issues stemmed from conflicting definitions in different d.ts files. By removing them all, the compiler was able to pinpoint the actual problems. This step helped resolve one of the major issues.

(2) I established a typings directory within my project folder. This directory served as a place to store almost all d.ts files, organizing modules into respective subdirectories. For example, I housed node.d.ts in typings\node.

(3) Within the typings directory, I created a file where I gradually added necessary solutions. While some refer to this file as

globals.d.ts</code, others prefer naming it <code>index.d.ts</code. In this file, I included solutions like extending the <code>String
interface with methods such as repeat and substr. I found inspiration for these additions in a copy of lib.es6.d.ts.

(4) I referenced this file in my source code using

/// <reference path="./typings/index.d.ts" />
, adjusting the path if necessary. Repeatedly compiling the code allowed me to iterate on adding more solutions as required until all errors were resolved, indicating completion of the d.ts file for the time being. Although future updates or additional source code may necessitate further modifications, addressing those concerns can wait for another day.

While progress is made in solving one issue, new challenges inevitably arise.

Despite encountering complexities, the TypeScript team actively addresses development tickets shared publicly, demonstrating a comprehensive understanding of the underlying problem. Continuous efforts contribute towards resolving ongoing challenges, offering hope for a smoother experience in the future.

Occasionally, relying solely on npm's typings resource may not guarantee access to the latest version of a d.ts file, potentially rendering existing solutions outdated. Adapting to newer versions poses certain uncertainties, especially given the evolving nature of software releases.

If incorporating lines from existing files successfully resolves errors, they suffice for immediate use. However, there are instances when external typings fall short in addressing specific issues.

Striving to independently tackle typings remains an ideal scenario, showcasing skill refinement in handling diverse challenges. Achieving autonomy in this aspect signifies progress, albeit occasional setbacks prompting acknowledgment of limitations.

Gaining thorough comprehension of these complexities brings reassurance and drives continuous improvement!

Answer №3

My situation was quite unique (maybe even extremely unique!) because the "files" entry in my tsconfig.json was pointing to the wrong file.

{
    "compilerOptions": {
        ...
    },
    "exclude": [
        ...
    ],
    "files": [
        "src/wrong.ts"  // <= DOUBLE CHECK THIS
    ]
}

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