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import type { ImageLoaderPropsWithConfig } from './image-config'
const DEFAULT_Q = 75
function defaultLoader({
config,
src,
width,
quality,
}: ImageLoaderPropsWithConfig): string {
if (process.env.NODE_ENV !== 'production') {
const missingValues = []
// these should always be provided but make sure they are
if (!src) missingValues.push('src')
if (!width) missingValues.push('width')
if (missingValues.length > 0) {
throw new Error(
`Next Image Optimization requires ${missingValues.join(
', '
)} to be provided. Make sure you pass them as props to the \`next/image\` component. Received: ${JSON.stringify(
{ src, width, quality }
)}`
)
}
if (src.startsWith('//')) {
throw new Error(
`Failed to parse src "${src}" on \`next/image\`, protocol-relative URL (//) must be changed to an absolute URL (http:// or https://)`
)
}
if (src.startsWith('/') && config.localPatterns) {
if (
process.env.NODE_ENV !== 'test' &&
// micromatch isn't compatible with edge runtime
process.env.NEXT_RUNTIME !== 'edge'
) {
// We use dynamic require because this should only error in development
const { hasLocalMatch } =
require('./match-local-pattern') as typeof import('./match-local-pattern')
if (!hasLocalMatch(config.localPatterns, src)) {
throw new Error(
`Invalid src prop (${src}) on \`next/image\` does not match \`images.localPatterns\` configured in your \`next.config.js\`\n` +
`See more info: https://nextjs.org/docs/messages/next-image-unconfigured-localpatterns`
)
}
}
}
if (!src.startsWith('/') && (config.domains || config.remotePatterns)) {
let parsedSrc: URL
try {
parsedSrc = new URL(src)
} catch (err) {
console.error(err)
throw new Error(
`Failed to parse src "${src}" on \`next/image\`, if using relative image it must start with a leading slash "/" or be an absolute URL (http:// or https://)`
)
}
if (
process.env.NODE_ENV !== 'test' &&
// micromatch isn't compatible with edge runtime
process.env.NEXT_RUNTIME !== 'edge'
) {
// We use dynamic require because this should only error in development
const { hasRemoteMatch } =
require('./match-remote-pattern') as typeof import('./match-remote-pattern')
if (
!hasRemoteMatch(config.domains!, config.remotePatterns!, parsedSrc)
) {
throw new Error(
`Invalid src prop (${src}) on \`next/image\`, hostname "${parsedSrc.hostname}" is not configured under images in your \`next.config.js\`\n` +
`See more info: https://nextjs.org/docs/messages/next-image-unconfigured-host`
)
}
}
}
if (quality && config.qualities && !config.qualities.includes(quality)) {
throw new Error(
`Invalid quality prop (${quality}) on \`next/image\` does not match \`images.qualities\` configured in your \`next.config.js\`\n` +
`See more info: https://nextjs.org/docs/messages/next-image-unconfigured-qualities`
)
}
}
const q =
quality ||
config.qualities?.reduce((prev, cur) =>
Math.abs(cur - DEFAULT_Q) < Math.abs(prev - DEFAULT_Q) ? cur : prev
) ||
DEFAULT_Q
return `${config.path}?url=${encodeURIComponent(src)}&w=${width}&q=${q}${
src.startsWith('/_next/static/media/') && process.env.NEXT_DEPLOYMENT_ID
? `&dpl=${process.env.NEXT_DEPLOYMENT_ID}`
: ''
}`
}
// We use this to determine if the import is the default loader
// or a custom loader defined by the user in next.config.js
defaultLoader.__next_img_default = true
export default defaultLoader
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