not

predicates

Source Code | Documentation

See also: hooks/iff hooks/iffElse predicates/every predicates/some

Negates a sync or async predicate function, inverting its boolean result. Useful for composing conditions like "not external" or "not multi".

  import { not } from 'feathers-utils/predicates';

Example

import { iff, not, isProvider } from 'feathers-utils/predicates'

app.service('users').hooks({
  before: { all: [iff(not(isProvider('server')), authenticate('jwt'))] }
})

Hooks for predicates

Hook	Description
iff	Conditionally executes a series of hooks when the predicate is truthy. The predicate can be a boolean value or a sync/async function. Supports an .else(...) chain for the falsy branch. Also exported as when.
iffElse	Executes one array of hooks when the predicate is truthy, or another array when it is falsy. The predicate can be a boolean or a sync/async function. Unlike iff, both branches are provided upfront without chaining.
skippable	Wraps a hook so it can be conditionally skipped based on a predicate. When the predicate returns true, the wrapped hook is skipped entirely. Commonly used with shouldSkip and addSkip for runtime hook control.
throwIf	Throws a BadRequest error when the given predicate function returns true. The predicate receives the hook context and can be async. Useful for validating conditions before proceeding with a request.
unless	Executes a series of hooks when the predicate is falsy --- the inverse of iff. The predicate can be a boolean or a sync/async function. Useful for applying hooks to all contexts except those matching a condition.

Type declaration

Show Type Declarations

/**
 * Negates a sync or async predicate function, inverting its boolean result.
 * Useful for composing conditions like "not external" or "not multi".
 *
 * @example
 * ```ts
 *
 *
 * app.service('users').hooks({
 *   before: { all: [iff(not(isProvider('server')), authenticate('jwt'))] }
 * })
 * ```
 *
 * @see https://utils.feathersjs.com/predicates/not.html
 */
export declare const not: <H extends HookContext = HookContext>(
  predicate: PredicateFn<H>,
) => PredicateFn<H>

Argument	Type	Description
predicate	PredicateFn<H>