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Make export-order-loader compatible with both es and cjs
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72 changes: 52 additions & 20 deletions
72
code/builders/builder-webpack5/src/loaders/export-order-loader.ts
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,34 +1,66 @@ | ||
import { parse } from 'es-module-lexer'; | ||
import { parse as parseCjs, init as initCjsParser } from 'cjs-module-lexer'; | ||
import { parse as parseEs } from 'es-module-lexer'; | ||
import MagicString from 'magic-string'; | ||
import type { LoaderContext } from 'webpack'; | ||
|
||
export default async function loader(this: LoaderContext<any>, source: string) { | ||
export default async function loader( | ||
this: LoaderContext<any>, | ||
source: string, | ||
map: any, | ||
meta: any | ||
) { | ||
const callback = this.async(); | ||
|
||
try { | ||
// Do NOT remove await here. The types are wrong! It has to be awaited, | ||
// otherwise it will return a Promise<Promise<...>> when wasm isn't loaded. | ||
const [, exports = []] = await parse(source); | ||
|
||
const namedExportsOrder = exports.some( | ||
(e) => source.substring(e.s, e.e) === '__namedExportsOrder' | ||
); | ||
let isEsModule = true, esImports, moduleExports, namedExportsOrder; | ||
|
||
try { | ||
// Do NOT remove await here. The types are wrong! It has to be awaited, | ||
// otherwise it will return a Promise<Promise<...>> when wasm isn't loaded. | ||
const parseResult = await parseEs(source); | ||
esImports = parseResult[0] || []; | ||
moduleExports = parseResult[1] || []; | ||
} catch { | ||
esImports = []; | ||
moduleExports = []; | ||
} | ||
|
||
if (!moduleExports.length && !esImports.length) { | ||
isEsModule = false; | ||
try { | ||
await initCjsParser(); | ||
moduleExports = (parseCjs(source)).exports || []; | ||
} catch { | ||
moduleExports = []; | ||
} | ||
namedExportsOrder = moduleExports.filter( | ||
(e) => e !== 'default' && e !== '__esModule' | ||
); | ||
} else { | ||
namedExportsOrder = moduleExports.map( | ||
(e) => source.substring(e.s, e.e) | ||
).filter((e) => e !== 'default'); | ||
} | ||
|
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if (namedExportsOrder) { | ||
return callback(null, source); | ||
if (namedExportsOrder.indexOf('__namedExportsOrder') >= 0) { | ||
return callback(null, source, map, meta); | ||
} | ||
|
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const magicString = new MagicString(source); | ||
const orderedExports = exports.filter((e) => source.substring(e.s, e.e) !== 'default'); | ||
magicString.append( | ||
`;export const __namedExportsOrder = ${JSON.stringify( | ||
orderedExports.map((e) => source.substring(e.s, e.e)) | ||
)};` | ||
); | ||
const namedExportsOrderString = JSON.stringify(namedExportsOrder); | ||
if (isEsModule) { | ||
magicString.append( | ||
`;export const __namedExportsOrder = ${namedExportsOrderString};` | ||
); | ||
} else { | ||
magicString.append( | ||
`;module.exports.__namedExportsOrder = ${namedExportsOrderString};` | ||
); | ||
} | ||
|
||
const map = magicString.generateMap({ hires: true }); | ||
return callback(null, magicString.toString(), map); | ||
const generatedMap = magicString.generateMap({ hires: true }); | ||
return callback(null, magicString.toString(), generatedMap, meta); | ||
} catch (err) { | ||
return callback(err as any); | ||
return callback(null, source, map, meta); | ||
} | ||
} |
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