misskey/packages/backend/src/decorators.ts
Shun Sakai c2370a1be6
chore: 著作権とライセンスについての情報を各ファイルに追加する (#11348)
* chore: Add the SPDX information to each file

Add copyright and licensing information as defined in version 3.0 of
the REUSE Specification.

* tweak format

---------

Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>
2023-07-27 14:31:52 +09:00

47 lines
1.1 KiB
TypeScript

/*
* SPDX-FileCopyrightText: syuilo and other misskey contributors
* SPDX-License-Identifier: AGPL-3.0-only
*/
// https://github.com/andreypopp/autobind-decorator
/**
* Return a descriptor removing the value and returning a getter
* The getter will return a .bind version of the function
* and memoize the result against a symbol on the instance
*/
export function bindThis(target: any, key: string, descriptor: any) {
let fn = descriptor.value;
if (typeof fn !== 'function') {
throw new TypeError(`@bindThis decorator can only be applied to methods not: ${typeof fn}`);
}
return {
configurable: true,
get() {
// eslint-disable-next-line no-prototype-builtins
if (this === target.prototype || this.hasOwnProperty(key) ||
typeof fn !== 'function') {
return fn;
}
const boundFn = fn.bind(this);
Object.defineProperty(this, key, {
configurable: true,
get() {
return boundFn;
},
set(value) {
fn = value;
delete this[key];
},
});
return boundFn;
},
set(value: any) {
fn = value;
},
};
}