85 lines
2.6 KiB
Plaintext
85 lines
2.6 KiB
Plaintext
/**
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* Wrap a function or class to show a deprecation message when first called.
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*
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* > 👉 **Important**: only shows a message when the `development` condition is
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* > used, does nothing in production.
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*
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* When the resulting wrapped `fn` is called, emits a warning once to
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* `console.error` (`stderr`).
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* If a code is given, one warning message will be emitted in total per code.
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*
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* @template {Function} T
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* Function or class kind.
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* @param {T} fn
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* Function or class.
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* @param {string} message
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* Message explaining deprecation.
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* @param {string | null | undefined} [code]
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* Deprecation identifier (optional); deprecation messages will be generated
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* only once per code.
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* @returns {T}
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* Wrapped `fn`.
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*/
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export function deprecate<T extends Function>(
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fn: T,
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message: string,
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code?: string | null | undefined
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): T
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/**
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* Assert deep strict equivalence.
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*
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* > 👉 **Important**: only asserts when the `development` condition is used,
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* > does nothing in production.
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*
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* @template {unknown} T
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* Expected kind.
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* @param {unknown} actual
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* Value.
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* @param {T} expected
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* Baseline.
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* @param {Error | string | null | undefined} [message]
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* Message for assertion error (default: `'Expected values to be deeply equal'`).
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* @returns {asserts actual is T}
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* Nothing; throws when `actual` is not deep strict equal to `expected`.
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* @throws {AssertionError}
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* Throws when `actual` is not deep strict equal to `expected`.
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*/
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export function equal<T extends unknown>(
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actual: unknown,
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expected: T,
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message?: Error | string | null | undefined
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): asserts actual is T
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/**
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* Assert if `value` is truthy.
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*
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* > 👉 **Important**: only asserts when the `development` condition is used,
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* > does nothing in production.
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*
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* @param {unknown} value
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* Value to assert.
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* @param {Error | string | null | undefined} [message]
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* Message for assertion error (default: `'Expected value to be truthy'`).
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* @returns {asserts value}
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* Nothing; throws when `value` is falsey.
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* @throws {AssertionError}
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* Throws when `value` is falsey.
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*/
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export function ok(
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value: unknown,
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message?: Error | string | null | undefined
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): asserts value
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/**
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* Assert that a code path never happens.
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*
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* > 👉 **Important**: only asserts when the `development` condition is used,
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* > does nothing in production.
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*
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* @param {Error | string | null | undefined} [message]
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* Message for assertion error (default: `'Unreachable'`).
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* @returns {never}
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* Nothing; always throws.
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* @throws {AssertionError}
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* Throws when `value` is falsey.
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*/
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export function unreachable(message?: Error | string | null | undefined): never
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