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45 changes: 39 additions & 6 deletions packages/vite/src/module-runner/importMetaResolver.ts
Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
import type { ResolveFnOutput, ResolveHookContext } from 'node:module'

export type ImportMetaResolver = (specifier: string, importer: string) => string

const customizationHookNamespace = 'vite-module-runner:import-meta-resolve/v1/'
Expand All @@ -10,11 +12,26 @@ export async function resolve(specifier, context, nextResolve) {
specifier = parsedSpecifier
context.parentURL = parsedImporter
}

return nextResolve(specifier, context)
}

`
function customizationHookResolve(
specifier: string,
context: ResolveHookContext,
nextResolve: (
specifier: string,
context: ResolveHookContext,
) => ResolveFnOutput,
): ResolveFnOutput {
if (specifier.startsWith(customizationHookNamespace)) {
const data = specifier.slice(customizationHookNamespace.length)
const [parsedSpecifier, parsedImporter] = JSON.parse(data)
specifier = parsedSpecifier
context.parentURL = parsedImporter
}
return nextResolve(specifier, context)
}

export async function createImportMetaResolver(): Promise<
ImportMetaResolver | undefined
Expand All @@ -26,7 +43,17 @@ export async function createImportMetaResolver(): Promise<
return
}
// `module.Module` may be `undefined` when `node:module` is mocked
if (!module?.register) {
if (!module) {
return
}

// Use registerHooks if available as it's more performant
if (module.registerHooks) {
module.registerHooks({ resolve: customizationHookResolve })
return importMetaResolveWithCustomHook
}

if (!module.register) {
return
}

Expand All @@ -41,8 +68,14 @@ export async function createImportMetaResolver(): Promise<
throw e
}

return (specifier: string, importer: string) =>
import.meta.resolve(
`${customizationHookNamespace}${JSON.stringify([specifier, importer])}`,
)
return importMetaResolveWithCustomHook
}

function importMetaResolveWithCustomHook(
specifier: string,
importer: string,
): string {
return import.meta.resolve(
`${customizationHookNamespace}${JSON.stringify([specifier, importer])}`,
)
}