eczn

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/slab.h>

struct birthday {
	int day;
	int month;
	int year;

eczn

install chromium

$ brew install chromium
$ xattr -cr /Applications/Chromium.app

env settings

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// use Optional instead unknown 

type Optional = (undefined | null | number | string | Function | Optional[]) & {
  [key: string]: Optional;
}

declare const value: Optional;
const d = value?.a?.b?.c?.d;
if (typeof d === 'number') d.toFixed(2);

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// T ====> [...T, E]
type Concat<T, E> = T extends any[] ? [...T, E] : [];


// union to intersection of functions
// UnionToIoFn<'a' | 'b'>
// ====> ((x: 'a') => void) & ((x: 'b') => void)
// ====> that equal to { (x: 'a'): void; (x: 'b'): void }
type UnionToIoFn =

eczn

$ npm i gg@latest
$ npm i gg-1.0.0@npm:[email protected]

import ggOld from 'gg-1.0';
import gg from 'gg';

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$ [command] -v --verbose
$ [command] -V --version

eczn

a) remove .nvm dir

$ cd ~
$ rm -rf ./.nvm  # !! danger, be careful to delete with -rf

b) check node/npm removed or not

eczn

sometimes we need to change context's type in function

const f1 = {
  data: {
    i: 0,
  },
  methods: {
 inc() {

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const wait = (t = 0) => new Promise(r => setTimeout(r, t));
class Person {
  name: string;
  promise: Promise<any>;
  constructor(name: string) {
    this.name = name;
    this.promise = new Promise((resolve) => {
      resolve(undefined);
    });
  }

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class TextBoard {
  /**
   * 文字复制至剪切板
   * @param data 需要复制的文本
   */
  public copy = async (data: string) => {
    if (window.navigator.clipboard) {
      try {
        await window.navigator.clipboard.writeText(data)
      } catch (err) {