Property 'isNaN' does not exist on type 'NumberConstructor'.

[monolithed]

{
	"scripts": {
		"test": "tsc",
	},

	"devDependencies": {
		"typescript": "^2.2.2"
	}
}

{
	"compilerOptions": {
		"typeRoots": [
			"./node_modules/@types",
			"./index.d.ts"
		],

		"lib": [
			"es2017",
			"dom"
		],

		"target": "es2017",
		"module": "commonjs",
		"moduleResolution": "node",
		"noImplicitAny": false,

		"declaration": false,

		"allowSyntheticDefaultImports": false,
		"strictNullChecks": true,

		"emitDecoratorMetadata": true,
		"experimentalDecorators": true,
		"sourceMap": false
	},

	"exclude": [
		"./node_modules",
		"./cache"
	]
}

if (!Number.isNaN(value)) {
	return Number.parseInt(value);
}

error TS2339: Property 'isNaN' does not exist on type 'NumberConstructor'.
error TS2339: Property 'parseInt' does not exist on type 'NumberConstructor'.

What's wrong?

[mhegazy]

PRs welcomed. You can find more information about contributing lib.d.ts fixes at https://github.com/Microsoft/TypeScript/blob/master/CONTRIBUTING.md#contributing-libdts-fixes.

[sp00x]

The same seems to apply for Number.isFinite()

error TS2339: Property 'isFinite' does not exist on type 'NumberConstructor'.

ts 2.5.3

[Exegetech]

The same applies for

Number.isInteger

[mhegazy]

These are part of the es2015 library. make sure you have --lib es2015