As far as writing an export that is compatible for both ES5 and ES6, Babel already takes care of that for you. (As communicated in the comments to your question. I’m only clarifying for those who got lost in the dialog.) module.exports = MyClass will work with both var MyClass = require(‘mymodule’) and import MyClass … Read more
While setting cors in corsOptions I added value credentials true it worked as follows: private setCors(){ let whitelist = [‘http://localhost:4200′,’http://localhost:80’]; let corsOptions = { origin: (origin:any, callback:any)=>{ if (whitelist.indexOf(origin) !== -1) { callback(null, true) } else { callback(new Error(‘Not allowed by CORS’)) } },credentials: true } this.app.use(cors(corsOptions)); }
From your example: Case A: //utils.js export function doSomething() { //… } Case B: //utils.js export function doSomething() { //… } export default function doSomethingDefault() { //… } Result: import utils from ‘utils’ utils() // (Case A: undefined, Case B: doSomethingDefault) import * as utils from ‘utils’ utils // (Case A: utils = { doSomething: … Read more
If you don’t use a block ({}) as body of an arrow function, the body must be an expression: ArrowFunction: ArrowParameters[no LineTerminator here] => ConciseBody ConciseBody: [lookahead ≠ { ] AssignmentExpression { FunctionBody } But throw is a statement, not an expression. In theory () => throw x; is equivalent to () => { return … Read more
Delegating to another generator means the current generator stops producing values by itself, instead yielding the values produced by another generator until it exhausts it. It then resumes producing its own values, if any. For instance, if secondGenerator() produces numbers from 10 to 15, and firstGenerator() produces numbers from 1 to 5 but delegates to … Read more
You didn’t find it in the spec because in the syntax definitions it is written with blanks, as new . target. The name of the expression is NewTarget, and you’ll find that term a few times around. NewTarget is the first of the so-called meta properties and can be found in §12.3.8. Its sole purpose … Read more
Only recently with ES6. They are called “computed property names” From MDN: Starting with ECMAScript 2015, the object initializer syntax also supports computed property names. That allows you to put an expression in brackets [], that will be computed as the property name.
The solution I found was to create a new function in the subclass that has the same name as the inherited function. In this case push. Then inside the overriding function the inherited function is called via the super keyword. class newArray extends Array{ push(value) { //execute any logic require before pushing value onto array … Read more
If you insert </script> inside a script tag, no matter if it’s a string in quotes, apostrophes, or even a template literal, it will always close the script tag. You have to escape it, for example like that: var str=` <script> <\/script> ` var pre = document.createElement(‘pre’) pre.textContent = str document.body.appendChild(pre) However, if you use … Read more
What could I be missing? Babel assigns default exports to the default property. So if you use require to import ES6 modules, you need to access the default property: const Button = require(‘./Components/Button.js’).default;