Unexpected identifier error: Typescript interface name syntax is incorrect

I am currently learning Typescript and still navigating my way through it. I have extensively searched for a solution to the issue I am facing, but couldn't find one, hence I am seeking help here. The problem lies in a SyntaxError at the interface name, and I am unsure of how to resolve it. Below is a snippet of my code:

interface Cars {
    name:string
    model:string
    topSpeed:number
    colors:string[]
    speedPrint(carSpeed:number):void
}

class BMW implements Cars{
    name = 'BMW X6'
    model = 'S'
    topSpeed = 320
    colors = ['cobalt red','phantom blue','white']
    speedPrint(topSpeed:number):void{
        console.log(`My car top speed is ${topSpeed}`)
    }
}

and this is the error:

app.ts:1
interface Cars {
          ^^^^

SyntaxError: Unexpected identifier
    at wrapSafe (internal/modules/cjs/loader.js:979:16)
    at Module._compile (internal/modules/cjs/loader.js:1027:27)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
    at Module.load (internal/modules/cjs/loader.js:928:32)
    at Function.Module._load (internal/modules/cjs/loader.js:769:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
    at internal/main/run_main_module.js:17:47
typescriptinterface

Answer №1

Your code is free of any Typescript syntax errors. You can verify this by checking the Typescript playground.

However, it seems like you are attempting to run Typescript directly from Node.js, which may be the cause of the error since Javascript does not support interfaces. To resolve this, you will need to compile your *.ts files to *.js using tools like tsc, esbuild, or deno. Alternatively, you can run Typescript directly with ts-node.

I would need more information about your setup and the command that triggered the error to provide a more tailored solution.

Answer №2

I encountered the same issue, but I managed to resolve it by following these steps:

  1. Start by installing TypeScript with the command npm install -g typescript
  2. Next, compile your TypeScript file using tsc filename.ts
  3. Finally, run the compiled JavaScript file with node ./file.js (not ts) and observe any output in the terminal

Answer №3

Instead of using the command run node .ts, you can try:

  1. tsc .ts
  2. node .js By running the first command, it will generate the corresponding javascript file for your typescript file.

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