Typescript Cannot find name 'IterableIterator'

Question

I have problem with my code in typescript After compile by tsc, I have errors like about cannot find some names.

app.ts(1,22): error TS2304: Cannot find name 'IterableIterator'.
app.ts(8,20): error TS2304: Cannot find name 'IteratorResult'.
app.ts(26,6): error TS2304: Cannot find name 'Symbol'.
app.ts(26,26): error TS2304: Cannot find name 'IterableIterator'.

My code is:

class Fib implements IterableIterator<number> {
    protected fn1 = 0;
    protected fn2 = 1;

    constructor(protected maxValue?: number) {}

    public next(): IteratorResult<number> {
        var current = this.fn1;
        this.fn1 = this.fn2;
        this.fn2 = current + this.fn1;

        if (this.maxValue && current <= this.maxValue) {
            return {
                done: false,
                value: current
            }
        }

        return {
            done: true
        }
    }

    [Symbol.iterator](): IterableIterator<number> {
        eturn this;
    }
}

fib = new Fib();
console.log(fib.next());

version tsc is Version 2.1.0-dev.20160716

What's your target in the compilation options? It should be ES6 — Nitzan Tomer
– Nitzan Tomer, Commented Jul 17, 2016 at 11:54
My target is ES6: { "compilerOptions": { "target": "ES6", "module": "commonjs", "sourceMap": true } } — Marcin Pruciak
– Marcin Pruciak, Commented Jul 17, 2016 at 12:19
I'm able to compile your code with target ES6 (using tsc version 1.8.10). You might have other things that affect the compilation (check this). — Nitzan Tomer
– Nitzan Tomer, Commented Jul 17, 2016 at 12:34
Problem was that tsc cannot see my tsconfig.json, after run tsc -t ES6 app.ts code was compiled properly. — Marcin Pruciak
– Marcin Pruciak, Commented Jul 17, 2016 at 12:38
Consider writing your last comment as a self-answer; after some time you will also be able to accept it, so that future users with a similar problem would benefit from it. — lfurini
– lfurini, Commented Jul 17, 2016 at 13:27

Marcin Pruciak · Accepted Answer · 2016-07-17 13:33:26Z

14

Problem was that tsc cannot see my tsconfig.json, after run tsc -t ES6 app.ts code was compiled properly.

answered Jul 17, 2016 at 13:33

Marcin Pruciak

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1 Comment

Michael W. Czechowski Over a year ago

This only works as long as you want to compile a ES6 TypeScript file to a ES6 JavaScript file, what does not make any sense for me. So you could just change the file suffix .ts to .js. I am sceptical, if that is the correct answer.

Shim-Sao · Accepted Answer · 2019-07-21 04:47:15Z

12

I solve the same problem with tsc -v 3.5.3 and @types/node (tested es5 and es6)

npm install @types/node --save--dev

and add "node" in the tsconfig.json

"compilerOptions": {
  "types": [
    "./",
    "node"
  ]
}

Take a look here DefinitelyTyped for complete node types.

answered Jul 21, 2019 at 4:47

Shim-Sao

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