/
compiler.ts
73 lines (64 loc) · 1.92 KB
/
compiler.ts
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import { webpack } from 'next/dist/compiled/webpack/webpack'
export type CompilerResult = {
errors: string[]
warnings: string[]
}
function generateStats(
result: CompilerResult,
stat: webpack.Stats
): CompilerResult {
const { errors, warnings } = stat.toJson('errors-warnings')
if (errors.length > 0) {
result.errors.push(...errors)
}
if (warnings.length > 0) {
result.warnings.push(...warnings)
}
return result
}
// Webpack 5 requires the compiler to be closed (to save caches)
// Webpack 4 does not have this close method so in order to be backwards compatible we check if it exists
function closeCompiler(compiler: webpack.Compiler | webpack.MultiCompiler) {
return new Promise((resolve, reject) => {
if ('close' in compiler) {
// @ts-ignore Close only exists on the compiler in webpack 5
return compiler.close((err: any) => (err ? reject(err) : resolve()))
}
resolve()
})
}
export function runCompiler(
config: webpack.Configuration | webpack.Configuration[]
): Promise<CompilerResult> {
return new Promise((resolve, reject) => {
const compiler = webpack(config)
compiler.run(
(
err: Error,
statsOrMultiStats: { stats: webpack.Stats[] } | webpack.Stats
) => {
closeCompiler(compiler).then(() => {
if (err) {
const reason = err?.toString()
if (reason) {
return resolve({ errors: [reason], warnings: [] })
}
return reject(err)
}
if ('stats' in statsOrMultiStats) {
const result: CompilerResult = statsOrMultiStats.stats.reduce(
generateStats,
{ errors: [], warnings: [] }
)
return resolve(result)
}
const result = generateStats(
{ errors: [], warnings: [] },
statsOrMultiStats
)
return resolve(result)
})
}
)
})
}