@igor.dvlpr/my-file-path

My file path

🌟 An npm module that strongly types file paths! 🥊

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@igorskyflyer

🕵🏼 Usage

Install it by executing:

npm i "@igor.dvlpr/my-file-path"

🤹🏼 API

The module exposes a generic type and 3 generic functions.

Type

type FilePath<ext extends string>

Use this type for compile-time safety.

index.ts

type JsonFile = FilePath<'json'>

const filePathJson: JsonFile = 'abc.json' // works in the IDE
const filePathTxt: JsonFile = 'abc.txt' // will not work in the IDE

Functions

• isMyFilePath()
• createMyFilePath()
• assertMyFilePath

isMyFilePath

function isMyFilePath<Ext extends string>(
  filePath: string,
  extension: Ext
): boolean

Checks whether the provided filepath conforms with the provided file extension.

Generic parameter:

Ext - the file extension to use with the generic, without a leading dot.

Function parameters:

filePath - the filepath to check. extension - the file extension to perform the check with.

Will not throw. Returns a boolean.

createMyFilePath

function createMyFilePath<Ext extends string>(
  filePath: string,
  extension: Ext
): FilePath<Ext>

Checks whether the provided filepath conforms with the provided file extension and returns it if true. Otherwise it returns an empty string.

Generic parameter:

Ext - the file extension to use with the generic, without a leading dot.

Function parameters:

filePath - the filepath to check. extension - the file extension to perform the check with.

Will not throw. Returns a FilePath<Ext>.

assertMyFilePath

function assertMyFilePath<Ext extends string>(
  filePath: string,
  extension: Ext,
  errorMessage?: string
): void

Asserts whether the provided filepath conforms with the provided file extension.

Generic parameter:

Ext - the file extension to use with the generic, without a leading dot.

Function parameters:

filePath - the filepath to check. extension - the file extension to perform the check with. errorMessage - the error message to throw.

Will throw if the filepath doesn't conform the provided extension. Returns a void.

🪪 License

Licensed under the MIT license which is available here, MIT license.

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