@boost/decorators/mjs/Bind.mjs

Experimental decorators for common patterns.

import { isMethod } from './helpers/isMethod.mjs';

/**
 * A method decorator that automatically binds a class method's
 * `this` context to its current instance.
 */
function Bind() {
  return (target, property, descriptor) => {
    if (process.env.NODE_ENV !== "production" && (!isMethod(target, property, descriptor) || !('value' in descriptor && typeof descriptor.value === 'function'))) {
      throw new TypeError(`\`@Bind\` may only be applied to class methods.`);
    }
    const func = descriptor.value;
    return {
      configurable: true,
      get() {
        const bound = func.bind(this);

        // Only cache the bound function when in the deepest sub-class,
        // otherwise any `super` calls will overwrite each other.
        if (target.constructor.name === this.constructor.name) {
          Object.defineProperty(this, property, {
            configurable: true,
            value: bound,
            writable: true
          });
        }

        // eslint-disable-next-line @typescript-eslint/no-unsafe-return
        return bound;
      }
    };
  };
}
export { Bind };
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