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noUndeclaredDependencies

Diagnostic Category: lint/correctness/noUndeclaredDependencies

Since: v1.6.0 Sources:

Disallow the use of dependencies that aren’t specified in the package.json.

Indirect dependencies will trigger the rule because they aren’t declared in the package.json. This means that if the package @org/foo has a dependency on lodash, and then you use import "lodash" somewhere in your project, the rule will trigger a diagnostic for this import.

The rule ignores imports that are not valid package names. This includes internal imports that start with # and @/ and imports with a protocol such as node:, bun:, jsr:, https:.

To ensure that Visual Studio Code uses relative imports when it automatically imports a variable, you may set javascript.preferences.importModuleSpecifier and typescript.preferences.importModuleSpecifier to relative.

Examples

Section titled Examples

Invalid

Section titled Invalid
import "vite";

Valid

Section titled Valid
import { A } from "./local.js";
import assert from "node:assert";

Options

Section titled Options

Since v2.0.0

This rule supports the following options:

  • devDependencies: If set to false, then the rule will show an error when devDependencies are imported. Defaults to true.
  • peerDependencies: If set to false, then the rule will show an error when peerDependencies are imported. Defaults to true.
  • optionalDependencies: If set to false, then the rule will show an error when optionalDependencies are imported. Defaults to true.

You can set the options like this:

{
  "options": {
    "devDependencies": false,
    "peerDependencies": false,
    "optionalDependencies": false
  }
}

You can also use an array of globs instead of literal booleans. When using an array of globs, the setting will be set to true (no errors reported) if the name of the file being linted (i.e. not the imported file/module) matches a single glob in the array, and false otherwise.

In the following example, only test files can use dependencies in devDependencies section. dependencies, peerDependencies, and optionalDependencies are always available.

{
  "options": {
    "devDependencies": ["tests/*.test.js", "tests/*.spec.js"]
  }
}
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