/
assetImportMetaUrl.ts
109 lines (102 loc) · 3.86 KB
/
assetImportMetaUrl.ts
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import path from 'node:path'
import MagicString from 'magic-string'
import { stripLiteral } from 'strip-literal'
import type { Plugin } from '../plugin'
import type { ResolvedConfig } from '../config'
import { transformStableResult } from '../utils'
import { fileToUrl } from './asset'
import { preloadHelperId } from './importAnalysisBuild'
/**
* Convert `new URL('./foo.png', import.meta.url)` to its resolved built URL
*
* Supports template string with dynamic segments:
* ```
* new URL(`./dir/${name}.png`, import.meta.url)
* // transformed to
* import.meta.glob('./dir/**.png', { eager: true, import: 'default' })[`./dir/${name}.png`]
* ```
*/
export function assetImportMetaUrlPlugin(config: ResolvedConfig): Plugin {
return {
name: 'vite:asset-import-meta-url',
async transform(code, id, options) {
if (
!options?.ssr &&
id !== preloadHelperId &&
code.includes('new URL') &&
code.includes(`import.meta.url`)
) {
let s: MagicString | undefined
const assetImportMetaUrlRE =
/\bnew\s+URL\s*\(\s*('[^']+'|"[^"]+"|`[^`]+`)\s*,\s*import\.meta\.url\s*,?\s*\)/g
const cleanString = stripLiteral(code)
let match: RegExpExecArray | null
while ((match = assetImportMetaUrlRE.exec(cleanString))) {
const { 0: exp, 1: emptyUrl, index } = match
const urlStart = cleanString.indexOf(emptyUrl, index)
const urlEnd = urlStart + emptyUrl.length
const rawUrl = code.slice(urlStart, urlEnd)
if (!s) s = new MagicString(code)
// potential dynamic template string
if (rawUrl[0] === '`' && /\$\{/.test(rawUrl)) {
const ast = this.parse(rawUrl)
const templateLiteral = (ast as any).body[0].expression
if (templateLiteral.expressions.length) {
const pattern = JSON.stringify(buildGlobPattern(templateLiteral))
// Note: native import.meta.url is not supported in the baseline
// target so we use the global location here. It can be
// window.location or self.location in case it is used in a Web Worker.
// @see https://developer.mozilla.org/en-US/docs/Web/API/Window/self
s.overwrite(
index,
index + exp.length,
`new URL((import.meta.glob(${pattern}, { eager: true, import: 'default' }))[${rawUrl}], self.location)`,
{ contentOnly: true }
)
continue
}
}
const url = rawUrl.slice(1, -1)
const file = path.resolve(path.dirname(id), url)
// Get final asset URL. Catch error if the file does not exist,
// in which we can resort to the initial URL and let it resolve in runtime
const builtUrl = await fileToUrl(file, config, this).catch(() => {
const rawExp = code.slice(index, index + exp.length)
config.logger.warnOnce(
`\n${rawExp} doesn't exist at build time, it will remain unchanged to be resolved at runtime`
)
return url
})
s.overwrite(
index,
index + exp.length,
`new URL(${JSON.stringify(builtUrl)}, self.location)`,
{ contentOnly: true }
)
}
if (s) {
return transformStableResult(s, id, config)
}
}
return null
}
}
}
function buildGlobPattern(ast: any) {
let pattern = ''
let lastElementIndex = -1
for (const exp of ast.expressions) {
for (let i = lastElementIndex + 1; i < ast.quasis.length; i++) {
const el = ast.quasis[i]
if (el.end < exp.start) {
pattern += el.value.raw
lastElementIndex = i
}
}
pattern += '**'
}
for (let i = lastElementIndex + 1; i < ast.quasis.length; i++) {
pattern += ast.quasis[i].value.raw
}
return pattern
}