TS2304:Cannot find name 'btoa'

Question

I'm using btoa method for hashing username, password which seems to work fine but this error shows up in my TypeScript errors - WebStorm. How to resolve this?

js code

let base64hash = btoa(user.username+ ':' + user.key);

tsconfig.json

/* tsconfig.json */
{
  "compileOnSave": false,
  "compilerOptions": {
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "lib": [
      "es2016"
    ]
  }
}

We can start with you posting relevant code and configuration. — Nitzan Tomer, Mar 20 '17 at 08:53
Related: [Missing basic DOM types in TypeScript project](https://stackoverflow.com/questions/42603783/missing-basic-dom-types-in-typescript-project?rq=1) — Xeoncross, Jan 08 '20 at 23:28

score 15 · Accepted Answer · answered Mar 20 '17 at 09:16

15

The reason that the compiler can't find the definition for btoa() is that you're not including all the necessary libs.

When you use the --lib compiler option you need to include all the libs that are included by default when you're not using this option.
In your case what's missing is the DOM lib, so it should be:

/* tsconfig.json */
{
    ...
    "compilerOptions": {
        ...
        "lib": [
            "es2016", "DOM"
        ]
    }
}

As the definition for btoa is in the lib.dom.d.ts.

answered Mar 20 '17 at 09:16

Nitzan Tomer

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Setting `"lib": ["es2016", "DOM"]` still leads to "btoa is not defined" when I run tests. Does the `lib.dom.d.ts` need to be referenced or are their other `tsconfig.json` options that are needed? – Xeoncross Jan 08 '20 at 23:12

TS2304:Cannot find name 'btoa'

1 Answers1