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next.js/packages/next-server/lib/utils.js
Tim Neutkens 15bb1c5e79
Use Typescript to transpile Next.js core files instead of Babel (#5747)
- Replaces taskr-babel with taskr-typescript for the `next` package
- Makes sure Node 8+ is used, no unneeded transpilation
- Compile Next.js client side files through babel the same way pages are
- Compile Next.js client side files to esmodules, not commonjs, so that tree shaking works.
- Move error-debug.js out of next-server as it's only used/require in development
- Drop ansi-html as dependency from next-server
- Make next/link esmodule (for tree-shaking)
- Make next/router esmodule (for tree-shaking)
- add typescript compilation to next-server
- Remove last remains of Flow
- Move hoist-non-react-statics to next, out of next-server
- Move htmlescape to next, out of next-server
- Remove runtime-corejs2 from next-server
2018-11-28 15:03:02 +01:00

57 lines
1.4 KiB
JavaScript

export function execOnce (fn) {
let used = false
return (...args) => {
if (!used) {
used = true
fn.apply(this, args)
}
}
}
export function getLocationOrigin () {
const { protocol, hostname, port } = window.location
return `${protocol}//${hostname}${port ? ':' + port : ''}`
}
export function getURL () {
const { href } = window.location
const origin = getLocationOrigin()
return href.substring(origin.length)
}
export function getDisplayName (Component) {
if (typeof Component === 'string') {
return Component
}
return Component.displayName || Component.name || 'Unknown'
}
export function isResSent (res) {
return res.finished || res.headersSent
}
export async function loadGetInitialProps (Component, ctx) {
if (process.env.NODE_ENV !== 'production') {
if (Component.prototype && Component.prototype.getInitialProps) {
const message = `"${getDisplayName(Component)}.getInitialProps()" is defined as an instance method - visit https://err.sh/zeit/next.js/get-initial-props-as-an-instance-method for more information.`
throw new Error(message)
}
}
if (!Component.getInitialProps) return {}
const props = await Component.getInitialProps(ctx)
if (ctx.res && isResSent(ctx.res)) {
return props
}
if (!props) {
const message = `"${getDisplayName(Component)}.getInitialProps()" should resolve to an object. But found "${props}" instead.`
throw new Error(message)
}
return props
}