forked from vitejs/vite
-
Notifications
You must be signed in to change notification settings - Fork 0
/
assetImportMetaUrl.ts
173 lines (163 loc) · 5.83 KB
/
assetImportMetaUrl.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
import path from 'node:path'
import MagicString from 'magic-string'
import { stripLiteral } from 'strip-literal'
import { getQuery } from 'ufo'
import type { Plugin } from '../plugin'
import type { ResolvedConfig } from '../config'
import type { ResolveFn } from '../'
import {
isParentDirectory,
normalizePath,
slash,
transformStableResult,
} from '../utils'
import { CLIENT_ENTRY } from '../constants'
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 {
const normalizedPublicDir = normalizePath(config.publicDir)
let assetResolver: ResolveFn
return {
name: 'vite:asset-import-meta-url',
async transform(code, id, options) {
if (
!options?.ssr &&
id !== preloadHelperId &&
id !== CLIENT_ENTRY &&
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] === '`' && rawUrl.includes('${')) {
let [pureUrl, queryString = ''] = rawUrl.split('?')
if (queryString) {
pureUrl += '`'
queryString = '?' + queryString.replace(/`$/, '')
}
const ast = this.parse(pureUrl)
const templateLiteral = (ast as any).body[0].expression
if (templateLiteral.expressions.length) {
const pattern = buildGlobPattern(templateLiteral)
if (pattern.startsWith('**')) {
// don't transform for patterns like this
// because users won't intend to do that in most cases
continue
}
const query = getQuery(queryString)
const globOptions = {
eager: true,
import: 'default',
query: {
// A hack to allow 'as' & 'query' exist at the same time
url: '',
...query,
},
}
// 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.update(
index,
index + exp.length,
`new URL((import.meta.glob(${JSON.stringify(
pattern,
)}, ${JSON.stringify(
globOptions,
)}))[${pureUrl}], self.location)`,
)
continue
}
}
const url = rawUrl.slice(1, -1)
let file: string | undefined
if (url[0] === '.') {
file = slash(path.resolve(path.dirname(id), url))
} else {
assetResolver ??= config.createResolver({
extensions: [],
mainFields: [],
tryIndex: false,
preferRelative: true,
})
file = await assetResolver(url, id)
file ??= url.startsWith('/')
? slash(path.join(config.publicDir, url))
: slash(path.resolve(path.dirname(id), url))
}
// Get final asset URL. If the file does not exist,
// we fall back to the initial URL and let it resolve in runtime
let builtUrl: string | undefined
if (file) {
try {
if (isParentDirectory(normalizedPublicDir, file)) {
const publicPath =
'/' + path.posix.relative(normalizedPublicDir, file)
builtUrl = await fileToUrl(publicPath, config, this)
} else {
builtUrl = await fileToUrl(file, config, this)
}
} catch {
// do nothing, we'll log a warning after this
}
}
if (!builtUrl) {
const rawExp = code.slice(index, index + exp.length)
config.logger.warnOnce(
`\n${rawExp} doesn't exist at build time, it will remain unchanged to be resolved at runtime`,
)
builtUrl = url
}
s.update(
index,
index + exp.length,
`new URL(${JSON.stringify(builtUrl)}, self.location)`,
)
}
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
}