forked from vercel/next.js
/
next-flight-server-loader.ts
227 lines (205 loc) · 6.76 KB
/
next-flight-server-loader.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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
// TODO: add ts support for next-swc api
// @ts-ignore
import { parse } from '../../swc'
// @ts-ignore
import { getBaseSWCOptions } from '../../swc/options'
import { getRawPageExtensions } from '../../utils'
const getIsClientComponent =
(pageExtensions: string[]) => (importSource: string) => {
return new RegExp(`\\.client(\\.(${pageExtensions.join('|')}))?`).test(
importSource
)
}
const getIsServerComponent =
(pageExtensions: string[]) => (importSource: string) => {
return new RegExp(`\\.server(\\.(${pageExtensions.join('|')}))?`).test(
importSource
)
}
function isNextComponent(importSource: string) {
return (
importSource.includes('next/link') || importSource.includes('next/image')
)
}
export function isImageImport(importSource: string) {
// TODO: share extension with next/image
// TODO: add other static assets, jpeg -> jpg
return ['jpg', 'jpeg', 'png', 'webp', 'avif'].some((imageExt) =>
importSource.endsWith('.' + imageExt)
)
}
async function parseImportsInfo({
resourcePath,
source,
imports,
isClientCompilation,
isServerComponent,
isClientComponent,
}: {
resourcePath: string
source: string
imports: Array<string>
isClientCompilation: boolean
isServerComponent: (name: string) => boolean
isClientComponent: (name: string) => boolean
}): Promise<{
source: string
defaultExportName: string
}> {
const opts = getBaseSWCOptions({
filename: resourcePath,
globalWindow: isClientCompilation,
})
const ast = await parse(source, { ...opts.jsc.parser, isModule: true })
const { body } = ast
const beginPos = ast.span.start
let transformedSource = ''
let lastIndex = 0
let defaultExportName
for (let i = 0; i < body.length; i++) {
const node = body[i]
switch (node.type) {
case 'ImportDeclaration': {
const importSource = node.source.value
if (!isClientCompilation) {
// Server compilation for .server.js.
if (isServerComponent(importSource)) {
continue
}
const importDeclarations = source.substring(
lastIndex,
node.source.span.start - beginPos
)
if (
!(
isClientComponent(importSource) ||
isNextComponent(importSource) ||
isImageImport(importSource)
)
) {
if (
['react/jsx-runtime', 'react/jsx-dev-runtime'].includes(
importSource
)
) {
continue
}
// A shared component. It should be handled as a server
// component.
transformedSource += importDeclarations
transformedSource += JSON.stringify(`${importSource}?__sc_server__`)
} else {
// A client component. It should be loaded as module reference.
transformedSource += importDeclarations
transformedSource += JSON.stringify(`${importSource}?__sc_client__`)
imports.push(`require(${JSON.stringify(importSource)})`)
}
} else {
// For the client compilation, we skip all modules imports but
// always keep client components in the bundle. All client components
// have to be imported from either server or client components.
if (
!(
isClientComponent(importSource) ||
isServerComponent(importSource) ||
// Special cases for Next.js APIs that are considered as client
// components:
isNextComponent(importSource) ||
isImageImport(importSource)
)
) {
continue
}
imports.push(`require(${JSON.stringify(importSource)})`)
}
lastIndex = node.source.span.end - beginPos
break
}
case 'ExportDefaultDeclaration': {
const def = node.decl
if (def.type === 'Identifier') {
defaultExportName = def.name
} else if (def.type === 'FunctionExpression') {
defaultExportName = def.identifier.value
}
break
}
case 'ExportDefaultExpression':
const exp = node.expression
if (exp.type === 'Identifier') {
defaultExportName = exp.value
}
break
default:
break
}
}
if (!isClientCompilation) {
transformedSource += source.substring(lastIndex)
}
return { source: transformedSource, defaultExportName }
}
export default async function transformSource(
this: any,
source: string
): Promise<string> {
const { client: isClientCompilation, pageExtensions } = this.getOptions()
const { resourcePath, resourceQuery } = this
if (typeof source !== 'string') {
throw new Error('Expected source to have been transformed to a string.')
}
// We currently assume that all components are shared components (unsuffixed)
// from node_modules.
if (resourcePath.includes('/node_modules/')) {
return source
}
const rawRawPageExtensions = getRawPageExtensions(pageExtensions)
const isServerComponent = getIsServerComponent(rawRawPageExtensions)
const isClientComponent = getIsClientComponent(rawRawPageExtensions)
if (!isClientCompilation) {
// We only apply the loader to server components, or shared components that
// are imported by a server component.
if (
!isServerComponent(resourcePath) &&
resourceQuery !== '?__sc_server__'
) {
return source
}
}
const imports: string[] = []
const { source: transformedSource, defaultExportName } =
await parseImportsInfo({
resourcePath,
source,
imports,
isClientCompilation,
isServerComponent,
isClientComponent,
})
/**
* For .server.js files, we handle this loader differently.
*
* Server compilation output:
* export default function ServerComponent() { ... }
* export const __rsc_noop__ = () => { ... }
* ServerComponent.__next_rsc__ = 1
* ServerComponent.__webpack_require__ = __webpack_require__
*
* Client compilation output:
* The function body of Server Component will be removed
*/
const noop = `export const __rsc_noop__=()=>{${imports.join(';')}}`
let defaultExportNoop = ''
if (isClientCompilation) {
defaultExportNoop = `export default function ${
defaultExportName || 'ServerComponent'
}(){}\n${defaultExportName || 'ServerComponent'}.__next_rsc__=1;`
} else {
if (defaultExportName) {
// It's required to have the default export for pages. For other components, it's fine to leave it as is.
defaultExportNoop = `${defaultExportName}.__next_rsc__=1;${defaultExportName}.__webpack_require__=__webpack_require__;`
}
}
const transformed = transformedSource + '\n' + noop + '\n' + defaultExportNoop
return transformed
}