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https://github.com/terribleplan/next.js.git
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d1b67623f6
* Throw error if getInitialProps is defined as as instance method Omitting the static keyword happens pretty often. Therefore we should trigger a warning in devmode. Closes: #4782 * Document getInitialProps error * Add unit tests for loadGetInitialProps
92 lines
2.2 KiB
JavaScript
92 lines
2.2 KiB
JavaScript
export function warn (message) {
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if (process.env.NODE_ENV !== 'production') {
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console.error(message)
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}
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}
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export function execOnce (fn) {
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let used = false
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return (...args) => {
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if (!used) {
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used = true
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fn.apply(this, args)
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}
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}
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}
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export function deprecated (fn, message) {
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// else is used here so that webpack/uglify will remove the code block depending on the build environment
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if (process.env.NODE_ENV === 'production') {
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return fn
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} else {
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let warned = false
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const newFn = function (...args) {
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if (!warned) {
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warned = true
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console.error(message)
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}
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return fn.apply(this, args)
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}
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// copy all properties
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Object.assign(newFn, fn)
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return newFn
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}
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}
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export function printAndExit (message, code = 1) {
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if (code === 0) {
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console.log(message)
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} else {
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console.error(message)
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}
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process.exit(code)
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}
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export function getDisplayName (Component) {
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return Component.displayName || Component.name || 'Unknown'
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}
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export function isResSent (res) {
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return res.finished || res.headersSent
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}
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export async function loadGetInitialProps (Component, ctx) {
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if (process.env.NODE_ENV !== 'production') {
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if (Component.prototype && Component.prototype.getInitialProps) {
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const compName = getDisplayName(Component)
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const message = `"${compName}.getInitialProps()" is defined as an instance method - visit https://err.sh/next.js/get-inital-props-as-an-instance-method for more information.`
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throw new Error(message)
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}
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}
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if (!Component.getInitialProps) return {}
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const props = await Component.getInitialProps(ctx)
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if (ctx.res && isResSent(ctx.res)) {
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return props
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}
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if (!props) {
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const compName = getDisplayName(Component)
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const message = `"${compName}.getInitialProps()" should resolve to an object. But found "${props}" instead.`
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throw new Error(message)
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}
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return props
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}
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export function getLocationOrigin () {
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const { protocol, hostname, port } = window.location
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return `${protocol}//${hostname}${port ? ':' + port : ''}`
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}
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export function getURL () {
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const { href } = window.location
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const origin = getLocationOrigin()
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return href.substring(origin.length)
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}
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