jest-docblock

jest-docblock

jest-docblock is a package that can extract and parse a specially-formatted comment called a "docblock" at the top of a file.

A docblock looks like this:

/** * Stuff goes here! */

Docblocks can contain pragmas, which are words prefixed by @:

/** * Pragma incoming! * * @flow */

Pragmas can also take arguments:

/** * Check this out: * * @myPragma it is so cool */

jest-docblock can:

• extract the docblock from some code as a string
• parse a docblock string's pragmas into an object
• print an object and some comments back to a string

Installation

# with yarn $ yarn add jest-docblock # with npm $ npm install jest-docblock

Usage

const code = ` /** * Everything is awesome! * * @everything is:awesome * @flow */ export const everything = Object.create(null); export default function isAwesome(something) { return something === everything; } `; const { extract, strip, parse, parseWithComments, print, } = require('jest-docblock'); const docblock = extract(code); console.log(docblock); // "/**\n * Everything is awesome!\n * \n * @everything is:awesome\n * @flow\n */" const stripped = strip(code); console.log(stripped); // "export const everything = Object.create(null);\n export default function isAwesome(something) {\n return something === everything;\n }" const pragmas = parse(docblock); console.log(pragmas); // { everything: "is:awesome", flow: "" } const parsed = parseWithComments(docblock); console.log(parsed); // { comments: "Everything is awesome!", pragmas: { everything: "is:awesome", flow: "" } } console.log(print({pragmas, comments: 'hi!'})); // /**\n * hi!\n *\n * @everything is:awesome\n * @flow\n */;

API Documentation

extract(contents: string): string

Extracts a docblock from some file contents. Returns the docblock contained in contents. If contents did not contain a docblock, it will return the empty string ("").

strip(contents: string): string

Strips the top docblock from a file and return the result. If a file does not have a docblock at the top, then return the file unchanged.

parse(docblock: string): {[key: string]: string | string[] }

Parses the pragmas in a docblock string into an object whose keys are the pragma tags and whose values are the arguments to those pragmas.

parseWithComments(docblock: string): { comments: string, pragmas: {[key: string]: string | string[]} }

Similar to parse except this method also returns the comments from the docblock. Useful when used with print().

print({ comments?: string, pragmas?: {[key: string]: string | string[]} }): string

Prints an object of key-value pairs back into a docblock. If comments are provided, they will be positioned on the top of the docblock.