@typescript-eslint/no-explicit-any

any turns type checking off for a value, and for everything computed from it. You can call it, read any property of it and pass it anywhere, and a typo only shows up when the code runs. unknown also accepts every value, but you have to narrow it before you use it.

This rule is on by default in TypeScript files.

Configure

On by default as a warning. To turn it off:

[lint.rules]
"@typescript-eslint/no-explicit-any" = "off" # or "error"

Every option, set to its default:

[lint.rules]
"@typescript-eslint/no-explicit-any" = ["warn", {
  fixToUnknown = false,
  ignoreRestArgs = false,
}]

Examples

Reported:

function parse(text: string): any {
  return JSON.parse(text);
}

parse("{}").user.nmae; // no type error

Not reported:

function parse(text: string): unknown {
  return JSON.parse(text);
}

const result = parse("{}");
if (typeof result === "string") {
  console.log(result.length);
}

Options

Option	Default	What it does
fixToUnknown	false	Let --fix rewrite any to unknown, and keyof any to PropertyKey. The code may stop compiling until you narrow the values.
ignoreRestArgs	false	Allow any[], Array<any> and their readonly forms as the type of a rest parameter.

function log(...args: any[]) {
  console.log(...args);
}

Every other any is still reported:

function log(message: any) {
  console.log(message);
}