gulp-json-to-tsd

A gulp plugin to generate typescript definition file that represents a shape of JSON

For each JSON file a typescript interface will be generated that represents a shape of a JSON. Name of an interface is based on JSON file name. E.g. UserGroup interface (or IUserGroup, see below) will be generated for any of file names: user-group.json, user_group.json, userGroup.json, UserGroup.json.

Please, note that only basic latin letters and digits are currently supported. Any other character are ignored.

Install

$ npm install --save-dev gulp-json-to-tsd

Usage

const gulp = require('gulp');
const jsonToTsd = require('gulp-json-to-tsd');

gulp.task("default", () => {
	gulp.src("src/foo.json")
		.pipe(jsonToTsd())
		.pipe(gulp.dest("dist"))
);

Let's assume that src/foo.json has the following contents:

{
	"foo": "Lorem ipsum sid amet",
	"bar": 7009,
	"baz": {
		"fizz": null,
		"buzz": false
	}
}

Then by default plugin will generate the following definition:

declare interface Foo {
	"foo": string;
	"bar": number;
	"baz": {
		"fizz": null|undefined;
		"buzz": boolean;
	};
}

If we switch on namespaces and variable declarations (see options below), we will get:

declare namespace example {
	interface Foo {
		"foo": string;
		"bar": number;
		"baz": {
			"fizz": null|undefined;
			"buzz": boolean;
		};
	}
}
declare const foo: example.Foo;

API

jsonToTsd([options])

options

useInterfacePrefix

Type: boolean Default: false

If true, all interfaces will be prefixed with I letter. Let's assume that we have user-group.json file. Then if useInterfacePrefix = true, an IUserGroup interface will be generated. And if useInterfacePrefix = false, an interface will be UserGroup.

namespace

Type: string | undefined Default: undefined

If specified, all interface declarations will be put into namespace with a given name.

declareVariable

Type: boolean Default: false

Specifies if a variable of a generated interface must be declared. A declaration is put after an interface out of a namespace block (if any).

identStyle

Type: "tab" | "space" Default: "tab"

Specifies identiation style.

identSize

Type: number Default: 1

Specifies how many tabs/spaces will be used for one level of identiation.

License

MIT © 2017 Roman Liberov