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Running CLI Node scripts, capture the return value of a shell command:
const execSync = require('child_process').execSync;
const nodeVer = execSync('node -v', { encoding: 'utf8' });
Shell command reports in the CLI:
const execSync = require('child_process').execSync;
execSync('npm -g ls', { stdio: 'inherit' });
Here are a couple good resources for deciding which NPM packages to use in a project:
Continue reading “Package Panic”Update all the packages in a NPM project to the latest version and sort out Babel dependencies:
npx npm-check-updates --upgradeAll
npx babel-upgrade --write
npm install
Since the release of Git 2.16, the git branch command runs as paged executable instead of printing the branches to the console. To revert back to the old way of printing branches to the console, update your ~/.gitconfig as follows:
[pager] branch = false
const out = {
end: '\x1b[0m',
// Modifiers.
blink: '\x1b[5m',
bright: '\x1b[1m',
dim: '\x1b[2m',
hidden: '\x1b[8m',
reverse: '\x1b[7m',
underscore: '\x1b[4m',
// Foreground Colors.
black: '\x1b[30m',
blue: '\x1b[34m',
cyan: '\x1b[36m',
green: '\x1b[32m',
magenta: '\x1b[35m',
red: '\x1b[31m',
yellow: '\x1b[33m',
white: '\x1b[37m',
// Background Colors.
bgBlack: '\x1b[40m',
bgBlue: '\x1b[44m',
bgCyan: '\x1b[46m',
bgGreen: '\x1b[42m',
bgMagenta: '\x1b[45m',
bgRed: '\x1b[41m',
bgYellow: '\x1b[43m',
bgWhite: '\x1b[47m',
};
Usage:
console.log(out.red, 'Something went wrong:', err, out.end);
I have a problem getting values from deeply nested objects: if one of the properties along the namespace is incorrect|modified|removed, Javascript throws. To avoid this, you can end up with obnoxious validation:
// Trying to get this.data.homeScene.user.name
const isValid = (
typeof this.data === 'object' &&
typeof this.data.homeScene === 'object' &&
typeof this.data.homeScene.user === 'object' &&
typeof this.data.homeScene.user.name === 'string'
);
if (isValid) {
const { name } = this.data.homeScene.user;
...
}
What if I made a reusable helper to validate the namespace and return the value?
export default function getNamespace(startObj, path) {
const isValidArgs = (
typeof startObj === 'object' &&
typeof path === 'string'
);
if (!isValidArgs) return undefined;
const finalValue = path
.split('.')
.reduce((obj, p) => ((typeof obj === 'object')
? obj[p]
: undefined
), startObj);{
return finalValue;
}
Now the obnoxious validation looks like this:
// Trying to get this.data.homeScene.user.name
const name = getNamespace(this, 'data.homeScene.user.name');
if (name) { ... }
$ git merge -Xours branch-name $ git merge -XTheirs banch-name
Comes in really handy for sweeping updates, like running eslint --fix on an entire code base or merging package-lock.json.
Git command line is pretty confusing. Here are some aliases that I found helpful that normalize it with other command line commands and add a little bit better context.
Open global .gitconfig file:
$ open ~/.gitconfig
If there isn’t an [alias] section already, add one:
[alias] cd = checkout ll = branch ls = branch delete-merged = !git branch --merged | egrep -v \"(^\\*|master|development)\" | xargs git branch -d mk = checkout -b new-up = !git push -u origin `git symbolic-ref --short HEAD` stage = add unstage = reset HEAD
Update 2018-07:
To set VS Code as the default editor for commit and merge messages:
[core] editor = code --wait
ES6 introduced Object.entries and destructuring and template strings:
for (let [key, val] of Object.entries(myObjectPrimitive)) {
console.log(`myObjectPrimitive[${key}]: ${val}`);
}