Cannot find namespace NodeJS after webpack upgrade

I have Angular2 application that is built with WebPack. I upgraded WebPack from v1.8 to v2, and everything seems to be working fine. The only problem is that the old code has the following:

import Timer = NodeJS.Timer;
....
apptInterval: Timer;
....
this.apptInterval = setInterval(() => { ... }, 1000);

After the upgrade this gives me an error: TS2503: Cannot find namespace 'NodeJS'.

tsconfig.json looks like this:

{
"compilerOptions": { "target": "es5", "module": "commonjs", "moduleResolution": "node", "sourceMap": true, "emitDecoratorMetadata": true, "experimentalDecorators": true, "lib": ["es2015", "dom"], "noImplicitAny": true, "suppressImplicitAnyIndexErrors": true }
}

The docs for Angular/Webpack no longer have typings.json; however, even if I copy from Webpack 1 directory, it doesn't help. The content is typings.json is

{
"globalDependencies": { "jasmine": "registry:dt/jasmine#2.2.0+20160621224255", "node": "registry:dt/node" }
}

Interesting that if I remove references to NodeJS, everything works fine. Like this:

apptInterval: any;
....
this.apptInterval = setInterval(() => { ... }, 1000);

If I look under F12 debugger, the type of apptInterval is ZoneTask. I am sure there is a way to make it strong-typed, but it escapes me. The only suggestion I found was to run typings install dt~node --global --save-dev (which essentially updates typings.json, but doesn't help.

4 Answers

If you also have tsconfig.app.json in your working directory, try to add the attribute node to the types field. Like:

 { "extends": "../tsconfig.json", "compilerOptions": { "outDir": "../out-tsc/app", "module": "es6", "baseUrl": "", "types": ["node"] --> ADD THIS }, "exclude": [ "test.ts", "**/*.spec.ts" ]
}

For [email protected]+, use @types:

npm install -D @types/node @types/jasmine

If you still want to hang on to typings, include typings/index.d.ts to your tsconfig.json:

{ "include": [ "typings" ], // or
　"files": [ "typings/index.d.ts" ]
}

Adding node to the types didn't work for me, "types": ["node"] but adding to the type roots did

{ "compilerOptions": { ... "typeRoots": [ "node_modules/@types" ] }
}

I'm running Angular 12 and I have strict mode enabled, I had to add both Fzum and johnny S's answers to my tsconfig.app.json. The only time it didn't throw an error in console is when I had both.

My tsconfig.app.json looks like this:

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

Sorry for making this a separate answer, I don't have enough reputation to comment yet