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Module

x/ts_morph/ts_morph.d.ts>TypePredicateNode

TypeScript Compiler API wrapper for static analysis and programmatic code changes.
dsherret/ts-morph
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class TypePredicateNode
extends TypeNode<ts.TypePredicateNode>
import { TypePredicateNode } from "https://deno.land/x/ts_morph@15.1.0/ts_morph.d.ts";

A type predicate node which says the specified parameter name is a specific type if the function returns true.

Examples:

  • param is string in declare function isString(param: unknown): param is string;.
  • asserts condition in declare function assert(condition: any): asserts condition;.

Methods

getAssertsModifier(): Node<ts.AssertsKeyword> | undefined

Gets the asserts modifier if it exists.

getAssertsModifierOrThrow(): Node<ts.AssertsKeyword>

Gets the asserts modifier if it exists or throws otherwise.

getParameterNameNode(): Identifier | ThisTypeNode

Gets the parameter name node

getParent(): NodeParentType<ts.TypePredicateNode>
getParentOrThrow(): NonNullable<NodeParentType<ts.TypePredicateNode>>
getTypeNode(): TypeNode | undefined

Gets the type name if it exists or returns undefined when it asserts a condition.

getTypeNodeOrThrow(): TypeNode

Gets the type name if it exists or throws when it asserts a condition.

hasAssertsModifier(): boolean

Gets if the type predicate has an asserts modifier (ex. asserts condition).