Parser | /src/parsers/index.ts | ts_matches@v5.4.0 | Deno

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x/ts_matches/src/parsers/index.ts>Parser.isA

Being able to pattern match in typescript

Blu-J/ts-matches

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index.ts (default module)

array-of-parser.ts

array-parser.ts

concat-parser.ts

default-parser.ts

deferred-parser.ts

dictionary-parser.ts

DictionaryParser

DictionaryShaped

DictionaryTuple

every-parser.ts

function-parser.ts

guard-parser.ts

ISimpleParsedError

literal-parser.ts

mapped-parser.ts

maybe-parser.ts

number-parser.ts

object-parser.ts

recursive-parser.ts

RecursiveParser

shape-parser.ts

simple-parsers.ts

string-parser.ts

tuple-parser.ts

TupleParserInto

unknown-parser.ts

method Parser.isA

Re-export

import { Parser } from "https://deno.land/x/ts_matches@v5.4.0/src/parsers/index.ts";

isA<A, B extends A>(checkIsA: (value: A) => value is B, name: string): Parser<A, B>

This is a constructor helper that can use a predicate tester in the form of a guard function, and will return a parser that will only parse if the predicate returns true. https://www.typescriptlang.org/docs/handbook/advanced-types.html#type-guards-and-differentiating-types

Type Parameters

A

B extends A

Parameters

checkIsA: (value: A) => value is B

name: string

Returns