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authorruki <waruqi@gmail.com>2018-11-08 00:43:05 +0800
committerruki <waruqi@gmail.com>2018-11-07 22:18:30 +0800
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-# @babel/helpers
-
-> Collection of helper functions used by Babel transforms.
-
-## Install
-
-```sh
-npm install --save-dev @babel/helpers
-```
-
-## Usage
-
-Direct:
-
-```js
-import * as helpers from '@babel/helpers';
-import * as t from '@babel/types';
-
-const typeofHelper = helpers.get('typeof');
-
-t.isExpressionStatement(typeofHelper);
-// true
-```
-
-Inside a plugin:
-
-```js
-export default {
- visitor: {
- UnaryExpression(path) {
- // The .addHelper function adds, if needed, the helper to the file
- // and returns an expression which references the helper
- const typeofHelper = this.addHelper("typeof");
- t.isExpression(typeofHelper); // true
- }
-};
-```
-
-## Defining Helpers
-
-> **NOTE**: This package is only meant to be used by the packages inluded in this repository. There is currently no way for third-party plugins to define an helper.
-
-Helpers are defined in the `src/helpers.js` file, and they must be valid modules which follow these guidelines:
- - They must have a default export, which is their entry-point.
- - They can import other helpers, exclusively by using default imports.
- - They can't have named exports.
-
-```js
-helpers.customHelper = defineHelper(`
- import dep from "dependency";
- const foo = 2;
- export default function getFooTimesDepPlusX(x) {
- return foo * dep() + x;
- }
-`);
-```