Awesome

purify-ts-extra-codec

🛠 Extra utility codecs for purify-ts.

Install

npm install --save purify-ts-extra-codec
# or
yarn add purify-ts-extra-codec

API

interface codec alternative

Interface

Alternative implementation of Codec.interface.
Original Codec.interface returns optional field type to T | undefined, so it should give undefined explicitly if declare value with type annotation.

const value: GetType<typeof MyCodec> = { optionalField: undefined }

Interface allows to you to implicit undefined field value.
Implementation of Interface is internally uses original Codec.interface, it only changes returning type.

const ObjCodec = Interface({ str: string, opt: optional(string) });
ObjCodec.decode({ str: "foo" }) // Right({ str: "foo" });
const obj: GetInterface<typeof ObjCodec> = { str: "foo" };

❤️ Support schema.

String Codec Module

NonEmptyString

Ensure input string is non-empty.

NonEmptyString.decode("asdf"); // Right("asdf")
NonEmptyString.decode(""); // Left("[error message]")
NonEmptyString.decode(1234); // Left("[error message]")

❤️ Support schema.

StringLengthRangedIn

Ensure length of input string is in range.

StringLengthRangedIn({ gt: 2, lte: 5 }).decode("asdf"); // Right("asdf")
StringLengthRangedIn({ gte: 5, lte: 5 }).decode("asdf"); // Left("[error message]")
StringLengthRangedIn({ gte: 5, lte: 5 }).decode(1234); // Left("[error message]")

❤️ Support schema.

RegExpMatchedString

Ensure input string matched to RegExp.

RegExpMatchedString("\\w+").decode("asdf"); // Right("asdf")
RegExpMatchedString("\\w+").decode("1234"); // Left("[error message]")
RegExpMatchedString("\\w+").decode(1234); // Left("[error message]")

// those are deprecated interface (Non schema support)
RegExpMatchedString(/\w+/).decode("asdf"); // Right("asdf")
RegExpMatchedString(/\w+/).decode("1234"); // Left("[error message]")
RegExpMatchedString(/\w+/).decode(1234); // Left("[error message]")

❤️ Support schema.

FormattedStringFromDate

Convert Date instance into formatted string.

FormattedStringFromDate("yyyy_MM_dd").decode(new Date()); // Right("2020_01_01")
FormattedStringFromDate("yyyy_MM_dd").decode(new Date("InvalidDate")); // Left("[error message]")
FormattedStringFromDate("yyyy_MM_dd").decode("asdf"); // Left("[error message]")

⚠️ No schema support.

Number Codec Module

NumberRangedIn

Ensure input number is in range.

NumberRangedIn({ gt: 2, lte: 5 }).decode(3); // Right(3)
NumberRangedIn({ gte: 2, lt: 5 }).decode(0); // Left("[error message]")
NumberRangedIn({ gt: 2, lte: 5 }).decode("a"); // Left("[error message]")

❤️ Support schema.

NumberFromString

Convert string into number (if parsable).

NumberFromString.decode("-12.34"); // Right(-12.34)
NumberFromString.decode("Infinity"); // Left("[error message]")
NumberFromString.decode(1234); // Left("[error message]")

❤️ Support schema.

Integer

Ensure input number is integer.

Integer.decode(1234); // Right(1234)
Integer.decode(12.34); // Left("[error message]")
Integer.decode("1234"); // Left("[error message]")

❤️ Support schema.

IntegerFromString

Convert string into integer number (if possible).

IntegerFromString.decode("1234"); // Right(1234)
IntegerFromString.decode("12.34"); // Left("[error message]")
IntegerFromString.decode(1234); // Left("[error message]")

❤️ Support schema.

Date Codec Module

DateFromAny

Convert any date parsable object into Date.

DateFromAny.decode("2020/01/01"); // Right(Wed Jan 01 2020 00:00:00)
DateFromAny.decode(1577804400000); // Right(Wed Jan 01 2020 00:00:00)
DateFromAny.decode("today"); // Left("[error message]")

⚠️ No schema support.

DateFromStringFormatOf

Convert formatted date string into Date.

DateFromStringFormatOf("yyyy_MM_dd").decode("2020_01_01"); // Right(Wed Jan 01 2020 00:00:00)
DateFromStringFormatOf("yyyy_MM_dd").decode("2020"); // Left("[error message]")
DateFromStringFormatOf("yyyy_MM_dd").decode(new Date()); // Left("[error message]")

⚠️ No schema support.

Json Codec Module

JsonFromString

Convert string into Json value.

JsonFromString(Codec.interface({ type: string })).decode(`{ "type": "hello" }`); // Right({ type: "hello" })
JsonFromString(Codec.interface({ type: string })).decode(`{}`); // Left("[error message]")
JsonFromString(Codec.interface({ type: string })).decode(1234); // Left("[error message]")

⚠️ No schema support.

Codec Utility Module

withSchema

Utility for adding a schema after defined.

withSchema(
  MyCodec,
  (myCodecSchema) => ({
    ...myCodecSchema,
    pattern: "^[a-fA-F\\d]{8}$"
  })
);

extendCodec

Utility for type narrowing.

const ThreeLengthString = extendCodec(stringCodec, (str) =>
  str.length === 3 ? Right(str) : Left(`${str} must have exact 3 length`)
);

ThreeLengthString.decode("123"); // Right("123");
ThreeLengthString.decode("1"); // Left("[error message]")
ThreeLengthString.decode(1); // Left("[error message]")

chainCodec

Utility for composing multiple Codecs. This function accepts up to 9 Codecs.
⚠️ schema only uses last one codec schema.

const ThreeDigitIntegerFromString = chainCodec(
  ThreeLengthString,
  NumberFromString,
  Integer
);

ThreeDigitNumberFromString.decode("123"); // Right(123)
ThreeDigitNumberFromString.decode("1.4"); // Left("[error message]")
ThreeDigitNumberFromString.decode(123); // Left("[error message]")

sequenceWeak

sequenceWeak accepts up to 9 Either values and combines to one Either tuple.
All of Either Left type must be same, but Right types may not be same.
It is useful to wrap up multiple Codec results.
Name comes from weak Right type constraint of Either.sequence.

import { sequenceWeak } from "./sequenceWeak";

EitherAsync(async ({liftEither}) => {
  const [str, { id }, int] = await liftEither(sequenceWeak(
    string.decode(var1),
    Codec.interface({ id: string }).decode(var2),
    Integer.decode(var3)
  ));
})