diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index f7f00b6..de75e3f 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -19,11 +19,8 @@ jobs:
         with:
           fetch-all: true
 
-      - name: Generate Github Changelog
-        run: npx changelogithub
-        continue-on-error: true
-        env:
-          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+      - name: Build
+        run: pnpm build
 
       - name: Generate .vsix file
         working-directory: extensions/vscode
@@ -36,3 +33,9 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           VSCE_PAT: ${{secrets.VSCE_PAT}}
           OVSX_PAT: ${{secrets.OVSX_PAT}}
+
+      - name: Generate Github Changelog
+        run: npx changelogithub
+        continue-on-error: true
+        env:
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
diff --git a/.github/workflows/unit-test.yml b/.github/workflows/unit-test.yml
index a8fcbe5..fe59261 100644
--- a/.github/workflows/unit-test.yml
+++ b/.github/workflows/unit-test.yml
@@ -19,6 +19,9 @@ jobs:
       - name: Setup JS
         uses: sxzz/workflows/setup-js@69098296b6f6083ed99f38e2040f2a7238580e27 # v1.4.0
 
+      - name: Build
+        run: pnpm build
+
       - name: Type Check
         run: pnpm run typecheck
 
@@ -37,5 +40,8 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
 
+      - name: Build
+        run: pnpm build
+
       - name: Unit Test
         run: pnpm run test
diff --git a/extensions/vscode/package.json b/extensions/vscode/package.json
index 7637061..7aa3793 100644
--- a/extensions/vscode/package.json
+++ b/extensions/vscode/package.json
@@ -198,15 +198,15 @@
   "scripts": {
     "dev": "tsdown --watch",
     "build": "tsdown",
-    "postinstall": "npm run update",
     "update": "vscode-ext-gen --scope npmx --output ../../shared/meta.ts",
     "vscode:prepublish": "npm run build",
-    "package": "npx @vscode/vsce package --no-dependencies"
+    "package": "npx @vscode/vsce package --no-dependencies",
+    "prepare": "npm run update"
   },
   "devDependencies": {
     "@types/vscode": "1.101.0",
     "fast-npm-meta": "catalog:inline",
-    "jsonc-parser": "catalog:inline",
+    "npmx-language-core": "workspace:*",
     "ocache": "catalog:inline",
     "ofetch": "catalog:inline",
     "pathe": "catalog:inline",
@@ -214,7 +214,6 @@
     "reactive-vscode": "catalog:inline",
     "semver": "catalog:inline",
     "vscode-ext-gen": "catalog:dev",
-    "vscode-find-up": "catalog:inline",
-    "yaml": "catalog:inline"
+    "vscode-find-up": "catalog:inline"
   }
 }
diff --git a/extensions/vscode/src/api/package.ts b/extensions/vscode/src/api/package.ts
index 64b67e2..d2b5abd 100644
--- a/extensions/vscode/src/api/package.ts
+++ b/extensions/vscode/src/api/package.ts
@@ -1,7 +1,7 @@
 import type { MaybeError, PackageVersionsInfoWithMetadata } from 'fast-npm-meta'
-import { CACHE_MAX_AGE_ONE_DAY } from '#shared/constants'
 import { logger } from '#state'
 import { createBatchRunner } from '#utils/batch'
+import { CACHE_MAX_AGE_ONE_DAY } from '#utils/constants'
 import { getVersionsBatch } from 'fast-npm-meta'
 import { defineCachedFunction } from 'ocache'
 
diff --git a/extensions/vscode/src/api/replacement.ts b/extensions/vscode/src/api/replacement.ts
index 4f22650..aa3a0a3 100644
--- a/extensions/vscode/src/api/replacement.ts
+++ b/extensions/vscode/src/api/replacement.ts
@@ -1,6 +1,6 @@
 import type { ModuleReplacement } from 'module-replacements'
-import { CACHE_MAX_AGE_ONE_DAY, NPMX_DEV_API } from '#shared/constants'
 import { logger } from '#state'
+import { CACHE_MAX_AGE_ONE_DAY, NPMX_DEV_API } from '#utils/constants'
 import { encodePackageName } from '#utils/package'
 import { defineCachedFunction } from 'ocache'
 import { ofetch } from 'ofetch'
diff --git a/extensions/vscode/src/api/vulnerability.ts b/extensions/vscode/src/api/vulnerability.ts
index 56bdc83..5cec245 100644
--- a/extensions/vscode/src/api/vulnerability.ts
+++ b/extensions/vscode/src/api/vulnerability.ts
@@ -1,6 +1,7 @@
-import { CACHE_MAX_AGE_ONE_DAY, NPMX_DEV_API } from '#shared/constants'
 import { logger } from '#state'
-import { encodePackageName, formatPackageId } from '#utils/package'
+import { CACHE_MAX_AGE_ONE_DAY, NPMX_DEV_API } from '#utils/constants'
+import { encodePackageName } from '#utils/package'
+import { formatPackageId } from 'npmx-language-core/utils'
 import { defineCachedFunction } from 'ocache'
 import { ofetch } from 'ofetch'
 
diff --git a/extensions/vscode/src/commands/open-file-in-npmx.ts b/extensions/vscode/src/commands/open-file-in-npmx.ts
index bac53c9..d6e027b 100644
--- a/extensions/vscode/src/commands/open-file-in-npmx.ts
+++ b/extensions/vscode/src/commands/open-file-in-npmx.ts
@@ -1,7 +1,7 @@
-import { PACKAGE_JSON_BASENAME } from '#shared/constants'
 import { logger } from '#state'
 import { readPackageManifest } from '#utils/file'
 import { npmxFileUrl } from '#utils/links'
+import { PACKAGE_JSON_BASENAME } from 'npmx-language-core/constants'
 import { env, Uri, window } from 'vscode'
 import { findUp } from 'vscode-find-up'
 
diff --git a/extensions/vscode/src/commands/open-in-browser.ts b/extensions/vscode/src/commands/open-in-browser.ts
index d95ab06..62c5ddd 100644
--- a/extensions/vscode/src/commands/open-in-browser.ts
+++ b/extensions/vscode/src/commands/open-in-browser.ts
@@ -1,4 +1,4 @@
-import { NPMX_DEV } from '#shared/constants'
+import { NPMX_DEV } from '#utils/constants'
 import { env, Uri } from 'vscode'
 
 export function openInBrowser() {
diff --git a/extensions/vscode/src/composables/workspace-context.ts b/extensions/vscode/src/composables/workspace-context.ts
index 0025387..39ef6ba 100644
--- a/extensions/vscode/src/composables/workspace-context.ts
+++ b/extensions/vscode/src/composables/workspace-context.ts
@@ -1,7 +1,7 @@
 import type { Uri } from 'vscode'
 import { deleteWorkspaceContextCache, getWorkspaceContext } from '#core/workspace'
-import { SUPPORTED_DOCUMENT_PATTERN } from '#shared/constants'
 import { logger } from '#state'
+import { SUPPORTED_DOCUMENT_PATTERN } from '#utils/constants'
 import { isSupportedDependencyDocument, isWorkspaceLevelFile } from '#utils/file'
 import { useDisposable, useFileSystemWatcher } from 'reactive-vscode'
 import { window, workspace } from 'vscode'
diff --git a/extensions/vscode/src/core/workspace.ts b/extensions/vscode/src/core/workspace.ts
index cf2ed5f..6b3daa5 100644
--- a/extensions/vscode/src/core/workspace.ts
+++ b/extensions/vscode/src/core/workspace.ts
@@ -1,23 +1,34 @@
+import type { PackageInfo } from '#api/package'
 import type { PackageManager } from '#shared/types'
-import type { CatalogsInfo, ResolvedDependencyInfo } from '#types/context'
-import type { DependencyInfo, PackageManifestInfo, WorkspaceCatalogInfo } from '#types/extractor'
+import type {
+  CatalogsInfo,
+  ExtractedDependencyInfo,
+  PackageManifestInfo,
+  ResolvedDependencyInfo,
+  WorkspaceCatalogInfo,
+} from 'npmx-language-core/types'
 import type { CacheOptions } from 'ocache'
 import type { WorkspaceFolder } from 'vscode'
 import { getPackageInfo } from '#api/package'
-import { PNPM_WORKSPACE_BASENAME, YARN_WORKSPACE_BASENAME } from '#shared/constants'
 import { logger } from '#state'
 import { isOffsetInRange } from '#utils/ast'
-import { resolveDependencySpec } from '#utils/dependency'
 import { getDocumentText, isPackageManifestPath, isWorkspaceFilePath } from '#utils/file'
 import { resolveExactVersion } from '#utils/package'
 import { lazyInit } from '#utils/shared'
+import { PNPM_WORKSPACE_BASENAME, YARN_WORKSPACE_BASENAME } from 'npmx-language-core/constants'
+import { getExtractor } from 'npmx-language-core/extractors'
+import { resolveDependencySpec } from 'npmx-language-core/utils'
 import { defineCachedFunction } from 'ocache'
 import { commands, Uri, window, workspace } from 'vscode'
 import { accessOk } from 'vscode-find-up'
-import { getExtractor } from './extractors'
 
-type WithResolvedDependencyInfo<T> = Omit<T, 'dependencies'> & {
-  dependencies: ResolvedDependencyInfo[]
+export interface DependencyInfo extends ExtractedDependencyInfo, ResolvedDependencyInfo {
+  packageInfo: () => Promise<PackageInfo | null>
+  resolvedVersion: () => Promise<string | null>
+}
+
+type WithDependencyInfo<T> = Omit<T, 'dependencies'> & {
+  dependencies: DependencyInfo[]
 }
 
 export const workspaceFileMapping: Record<Exclude<PackageManager, 'npm'>, string> = {
@@ -90,7 +101,7 @@ class WorkspaceContext {
     return this.#catalogs!.promise
   }
 
-  #createResolvedDependencyInfo(dependency: DependencyInfo, catalogs?: CatalogsInfo): ResolvedDependencyInfo {
+  #createResolvedDependencyInfo(dependency: ExtractedDependencyInfo, catalogs?: CatalogsInfo): DependencyInfo {
     const resolution = resolveDependencySpec(dependency.rawName, dependency.rawSpec, catalogs)
 
     const packageInfo = lazyInit(
@@ -118,7 +129,7 @@ class WorkspaceContext {
   }
 
   loadPackageManifestInfo = defineCachedFunction<
-    WithResolvedDependencyInfo<PackageManifestInfo> | undefined,
+    WithDependencyInfo<PackageManifestInfo> | undefined,
     [Uri]
   >(async (uri) => {
     const path = uri.path
@@ -146,7 +157,7 @@ class WorkspaceContext {
   }, this.#cacheOptions)
 
   loadWorkspaceCatalogInfo = defineCachedFunction<
-    WithResolvedDependencyInfo<WorkspaceCatalogInfo> | undefined,
+    WithDependencyInfo<WorkspaceCatalogInfo> | undefined,
     [Uri]
   >(async (uri) => {
     const path = uri.path
@@ -200,7 +211,7 @@ export async function getWorkspaceContext(uri: Uri) {
   return await getWorkspaceContextByFolder(folder)
 }
 
-export async function getResolvedDependencies(uri: Uri): Promise<ResolvedDependencyInfo[] | undefined> {
+export async function getResolvedDependencies(uri: Uri): Promise<DependencyInfo[] | undefined> {
   const ctx = await getWorkspaceContext(uri)
   if (!ctx)
     return
@@ -212,7 +223,7 @@ export async function getResolvedDependencies(uri: Uri): Promise<ResolvedDepende
   )?.dependencies
 }
 
-export async function getResolvedDependencyByOffset(uri: Uri, offset: number): Promise<ResolvedDependencyInfo | undefined> {
+export async function getResolvedDependencyByOffset(uri: Uri, offset: number): Promise<DependencyInfo | undefined> {
   const dependencies = await getResolvedDependencies(uri)
 
   return dependencies?.find((dependency) => isOffsetInRange(offset, dependency.nameRange) || isOffsetInRange(offset, dependency.specRange))
diff --git a/extensions/vscode/src/providers/code-actions/index.ts b/extensions/vscode/src/providers/code-actions/index.ts
index 423c8b0..7028b7d 100644
--- a/extensions/vscode/src/providers/code-actions/index.ts
+++ b/extensions/vscode/src/providers/code-actions/index.ts
@@ -1,5 +1,5 @@
-import { SUPPORTED_DOCUMENT_PATTERN } from '#shared/constants'
 import { config, internalCommands } from '#state'
+import { SUPPORTED_DOCUMENT_PATTERN } from '#utils/constants'
 import { computed, useCommand, watch } from 'reactive-vscode'
 import { CodeActionKind, languages } from 'vscode'
 import { addToIgnore } from '../../commands/add-to-ignore'
diff --git a/extensions/vscode/src/providers/completion-item/index.ts b/extensions/vscode/src/providers/completion-item/index.ts
index e1c2358..944e5f2 100644
--- a/extensions/vscode/src/providers/completion-item/index.ts
+++ b/extensions/vscode/src/providers/completion-item/index.ts
@@ -1,5 +1,5 @@
-import { PACKAGE_JSON_BASENAME, SUPPORTED_DOCUMENT_PATTERN } from '#shared/constants'
 import { config } from '#state'
+import { PACKAGE_JSON_PATTERN, SUPPORTED_DOCUMENT_PATTERN } from '#utils/constants'
 import { watchEffect } from 'reactive-vscode'
 import { languages } from 'vscode'
 import { CatalogCompletionItemProvider } from './catalog'
@@ -21,7 +21,7 @@ export function useCompletionItem() {
 
   watchEffect((onCleanup) => {
     const disposable = languages.registerCompletionItemProvider(
-      { pattern: `**/${PACKAGE_JSON_BASENAME}` },
+      { pattern: PACKAGE_JSON_PATTERN },
       new CatalogCompletionItemProvider(),
       ...CatalogCompletionItemProvider.triggers,
     )
diff --git a/extensions/vscode/src/providers/completion-item/version.ts b/extensions/vscode/src/providers/completion-item/version.ts
index cd9072c..743358a 100644
--- a/extensions/vscode/src/providers/completion-item/version.ts
+++ b/extensions/vscode/src/providers/completion-item/version.ts
@@ -1,8 +1,8 @@
 import type { CompletionItemProvider, Position, TextDocument } from 'vscode'
 import { getResolvedDependencyByOffset } from '#core/workspace'
-import { PRERELEASE_PATTERN } from '#shared/constants'
 import { config } from '#state'
 import { offsetRangeToRange } from '#utils/ast'
+import { PRERELEASE_PATTERN } from '#utils/constants'
 import { formatUpgradeVersion } from '#utils/version'
 import { CompletionItem, CompletionItemKind } from 'vscode'
 
diff --git a/extensions/vscode/src/providers/definition/catalog.ts b/extensions/vscode/src/providers/definition/catalog.ts
index f42848e..b6e394a 100644
--- a/extensions/vscode/src/providers/definition/catalog.ts
+++ b/extensions/vscode/src/providers/definition/catalog.ts
@@ -1,7 +1,7 @@
 import type { DefinitionProvider, Position, TextDocument } from 'vscode'
 import { getResolvedDependencyByOffset, getWorkspaceContext } from '#core/workspace'
 import { offsetRangeToRange } from '#utils/ast'
-import { normalizeCatalogName } from '#utils/dependency'
+import { normalizeCatalogName } from 'npmx-language-core/utils'
 import { Location, workspace } from 'vscode'
 
 export class CatalogDefinitionProvider implements DefinitionProvider {
diff --git a/extensions/vscode/src/providers/definition/index.ts b/extensions/vscode/src/providers/definition/index.ts
index 67f05c9..4aa79f2 100644
--- a/extensions/vscode/src/providers/definition/index.ts
+++ b/extensions/vscode/src/providers/definition/index.ts
@@ -1,10 +1,10 @@
-import { PACKAGE_JSON_BASENAME } from '#shared/constants'
+import { PACKAGE_JSON_PATTERN } from '#utils/constants'
 import { useDisposable } from 'reactive-vscode'
 import { languages } from 'vscode'
 import { CatalogDefinitionProvider } from './catalog'
 
 export function useDefinition() {
   useDisposable(
-    languages.registerDefinitionProvider({ pattern: `**/${PACKAGE_JSON_BASENAME}` }, new CatalogDefinitionProvider()),
+    languages.registerDefinitionProvider({ pattern: PACKAGE_JSON_PATTERN }, new CatalogDefinitionProvider()),
   )
 }
diff --git a/extensions/vscode/src/providers/diagnostics/index.ts b/extensions/vscode/src/providers/diagnostics/index.ts
index 18a0a7e..e4190a4 100644
--- a/extensions/vscode/src/providers/diagnostics/index.ts
+++ b/extensions/vscode/src/providers/diagnostics/index.ts
@@ -1,12 +1,12 @@
-import type { ResolvedDependencyInfo } from '#types/context'
-import type { OffsetRange } from '#types/extractor'
+import type { DependencyInfo } from '#core/workspace'
+import type { OffsetRange } from 'npmx-language-core/types'
 import type { Awaitable } from 'reactive-vscode'
 import type { Diagnostic, TextDocument, Uri } from 'vscode'
 import { getResolvedDependencies } from '#core/workspace'
-import { SUPPORTED_DOCUMENT_PATTERN } from '#shared/constants'
 import { displayName } from '#shared/meta'
 import { config, logger } from '#state'
 import { offsetRangeToRange } from '#utils/ast'
+import { SUPPORTED_DOCUMENT_PATTERN } from '#utils/constants'
 import { isSupportedDependencyDocument } from '#utils/file'
 import { debounce } from 'perfect-debounce'
 import { computed, nextTick, useActiveTextEditor, useDisposable, useDocumentText, useFileSystemWatcher, watch } from 'reactive-vscode'
@@ -20,8 +20,8 @@ import { checkVulnerability } from './rules/vulnerability'
 
 export interface DiagnosticContext {
   uri: Uri
-  dep: ResolvedDependencyInfo
-  pkg: NonNullable<Awaited<ReturnType<ResolvedDependencyInfo['packageInfo']>>>
+  dep: DependencyInfo
+  pkg: NonNullable<Awaited<ReturnType<DependencyInfo['packageInfo']>>>
 }
 
 export interface RangeDiagnosticInfo extends Omit<Diagnostic, 'range' | 'source'> {
@@ -102,7 +102,7 @@ export function useDiagnostics() {
       }
     }
 
-    const collect = async (dep: ResolvedDependencyInfo) => {
+    const collect = async (dep: DependencyInfo) => {
       try {
         const pkg = await dep.packageInfo()
         if (!pkg || isStale(document, targetVersion))
diff --git a/extensions/vscode/src/providers/diagnostics/rules/__tests__/utils.ts b/extensions/vscode/src/providers/diagnostics/rules/__tests__/utils.ts
index f8b6bd9..02a2f6d 100644
--- a/extensions/vscode/src/providers/diagnostics/rules/__tests__/utils.ts
+++ b/extensions/vscode/src/providers/diagnostics/rules/__tests__/utils.ts
@@ -1,8 +1,8 @@
 import type { PackageInfo } from '#api/package'
 import type { Engines } from 'fast-npm-meta'
 import type { DiagnosticContext } from '../..'
-import { resolveDependencySpec } from '#utils/dependency'
 import { resolveExactVersion } from '#utils/package'
+import { resolveDependencySpec } from 'npmx-language-core/utils'
 import { Uri } from 'vscode'
 
 interface CreateContextOptions {
diff --git a/extensions/vscode/src/providers/diagnostics/rules/deprecation.ts b/extensions/vscode/src/providers/diagnostics/rules/deprecation.ts
index 39624fd..5194de2 100644
--- a/extensions/vscode/src/providers/diagnostics/rules/deprecation.ts
+++ b/extensions/vscode/src/providers/diagnostics/rules/deprecation.ts
@@ -2,7 +2,7 @@ import type { DiagnosticRule } from '..'
 import { config } from '#state'
 import { checkIgnored } from '#utils/ignore'
 import { npmxPackageUrl } from '#utils/links'
-import { formatPackageId } from '#utils/package'
+import { formatPackageId } from 'npmx-language-core/utils'
 import { DiagnosticSeverity, DiagnosticTag, Uri } from 'vscode'
 
 export const checkDeprecation: DiagnosticRule = async ({ dep, pkg }) => {
diff --git a/extensions/vscode/src/providers/diagnostics/rules/engine-mismatch.ts b/extensions/vscode/src/providers/diagnostics/rules/engine-mismatch.ts
index 37a660f..a739388 100644
--- a/extensions/vscode/src/providers/diagnostics/rules/engine-mismatch.ts
+++ b/extensions/vscode/src/providers/diagnostics/rules/engine-mismatch.ts
@@ -3,7 +3,7 @@ import type { DiagnosticRule } from '..'
 import { getWorkspaceContext } from '#core/workspace'
 import { isPackageManifestPath } from '#utils/file'
 import { npmxPackageUrl } from '#utils/links'
-import { formatPackageId } from '#utils/package'
+import { formatPackageId } from 'npmx-language-core/utils'
 import Range from 'semver/classes/range'
 import intersects from 'semver/ranges/intersects'
 import subset from 'semver/ranges/subset'
diff --git a/extensions/vscode/src/providers/diagnostics/rules/upgrade.test.ts b/extensions/vscode/src/providers/diagnostics/rules/upgrade.test.ts
index 6ee47fd..0e7d029 100644
--- a/extensions/vscode/src/providers/diagnostics/rules/upgrade.test.ts
+++ b/extensions/vscode/src/providers/diagnostics/rules/upgrade.test.ts
@@ -1,5 +1,5 @@
 import type { PackageInfo } from '#api/package'
-import type { ResolvedDependencyInfo } from '#types/context'
+import type { DependencyInfo } from '#core/workspace'
 import { describe, expect, it } from 'vitest'
 import { createContext } from './__tests__/utils'
 import { resolveUpgrade } from './upgrade'
@@ -16,7 +16,7 @@ const versionsMeta: Record<string, object> = {
   '3.0.0-alpha.5': {},
 }
 
-async function createOptions(version: string): Promise<[ResolvedDependencyInfo, PackageInfo, string]> {
+async function createOptions(version: string): Promise<[DependencyInfo, PackageInfo, string]> {
   const ctx = createContext({ name: 'vite', version, distTags, versionsMeta })
   return [ctx.dep, ctx.pkg, (await ctx.dep.resolvedVersion())!]
 }
diff --git a/extensions/vscode/src/providers/diagnostics/rules/upgrade.ts b/extensions/vscode/src/providers/diagnostics/rules/upgrade.ts
index 7e20dd1..57a8fd1 100644
--- a/extensions/vscode/src/providers/diagnostics/rules/upgrade.ts
+++ b/extensions/vscode/src/providers/diagnostics/rules/upgrade.ts
@@ -1,6 +1,6 @@
 import type { PackageInfo } from '#api/package'
-import type { ResolvedDependencyInfo } from '#types/context'
-import type { OffsetRange } from '#types/extractor'
+import type { DependencyInfo } from '#core/workspace'
+import type { OffsetRange } from 'npmx-language-core/types'
 import type { DiagnosticRule, RangeDiagnosticInfo } from '..'
 import { config } from '#state'
 import { checkIgnored } from '#utils/ignore'
@@ -11,7 +11,7 @@ import lte from 'semver/functions/lte'
 import prerelease from 'semver/functions/prerelease'
 import { DiagnosticSeverity, Uri } from 'vscode'
 
-export function resolveUpgrade(dep: ResolvedDependencyInfo, pkg: PackageInfo, resolvedVersion: string, ignoreList = config.ignore.upgrade) {
+export function resolveUpgrade(dep: DependencyInfo, pkg: PackageInfo, resolvedVersion: string, ignoreList = config.ignore.upgrade) {
   const { distTags } = pkg
   if (Object.hasOwn(distTags, dep.resolvedSpec))
     return
diff --git a/extensions/vscode/src/providers/diagnostics/rules/vulnerability.ts b/extensions/vscode/src/providers/diagnostics/rules/vulnerability.ts
index 4d259c7..a174276 100644
--- a/extensions/vscode/src/providers/diagnostics/rules/vulnerability.ts
+++ b/extensions/vscode/src/providers/diagnostics/rules/vulnerability.ts
@@ -4,8 +4,8 @@ import { getVulnerability, SEVERITY_LEVELS } from '#api/vulnerability'
 import { config } from '#state'
 import { checkIgnored } from '#utils/ignore'
 import { npmxPackageUrl } from '#utils/links'
-import { formatPackageId } from '#utils/package'
 import { formatUpgradeVersion } from '#utils/version'
+import { formatPackageId } from 'npmx-language-core/utils'
 import lt from 'semver/functions/lt'
 import { DiagnosticSeverity, Uri } from 'vscode'
 
diff --git a/extensions/vscode/src/providers/document-link/index.ts b/extensions/vscode/src/providers/document-link/index.ts
index 03cfc14..d5a9aa1 100644
--- a/extensions/vscode/src/providers/document-link/index.ts
+++ b/extensions/vscode/src/providers/document-link/index.ts
@@ -1,5 +1,5 @@
-import { SUPPORTED_DOCUMENT_PATTERN } from '#shared/constants'
 import { config } from '#state'
+import { SUPPORTED_DOCUMENT_PATTERN } from '#utils/constants'
 import { watchEffect } from 'reactive-vscode'
 import { languages } from 'vscode'
 import { NpmxDocumentLinkProvider } from './npmx'
diff --git a/extensions/vscode/src/providers/hover/index.ts b/extensions/vscode/src/providers/hover/index.ts
index 77ba100..7e5f992 100644
--- a/extensions/vscode/src/providers/hover/index.ts
+++ b/extensions/vscode/src/providers/hover/index.ts
@@ -1,5 +1,5 @@
-import { SUPPORTED_DOCUMENT_PATTERN } from '#shared/constants'
 import { config } from '#state'
+import { SUPPORTED_DOCUMENT_PATTERN } from '#utils/constants'
 import { watchEffect } from 'reactive-vscode'
 import { languages } from 'vscode'
 import { NpmxHoverProvider } from './npmx'
diff --git a/extensions/vscode/src/providers/hover/npmx.ts b/extensions/vscode/src/providers/hover/npmx.ts
index 34db1d7..ac63d64 100644
--- a/extensions/vscode/src/providers/hover/npmx.ts
+++ b/extensions/vscode/src/providers/hover/npmx.ts
@@ -1,9 +1,10 @@
 import type { HoverProvider, Position, TextDocument } from 'vscode'
 import { getResolvedDependencyByOffset } from '#core/workspace'
-import { SPACER } from '#shared/constants'
 import { jsrPackageUrl, npmxDocsUrl, npmxPackageUrl } from '#utils/links'
 import { Hover, MarkdownString } from 'vscode'
 
+const SPACER = '&nbsp;'
+
 export class NpmxHoverProvider implements HoverProvider {
   async provideHover(document: TextDocument, position: Position) {
     const offset = document.offsetAt(position)
diff --git a/extensions/vscode/src/types/context.ts b/extensions/vscode/src/types/context.ts
deleted file mode 100644
index 46ff099..0000000
--- a/extensions/vscode/src/types/context.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-import type { PackageInfo } from '#api/package'
-import type { DependencyInfo } from '#types/extractor'
-
-export type DependencyProtocol
-  = | 'npm'
-    | 'jsr'
-    | 'workspace'
-    | 'catalog'
-    | 'git'
-    | 'file'
-    | 'http'
-    | null
-
-export type CatalogsInfo = Record<string, Record<string, string>>
-
-export interface ResolvedDependencyInfo extends DependencyInfo {
-  protocol: DependencyProtocol
-  resolvedName: string
-  resolvedSpec: string
-  resolvedProtocol: DependencyProtocol
-  packageInfo: () => Promise<PackageInfo | null>
-  resolvedVersion: () => Promise<string | null>
-}
diff --git a/extensions/vscode/src/types/extractor.ts b/extensions/vscode/src/types/extractor.ts
deleted file mode 100644
index 696c8e2..0000000
--- a/extensions/vscode/src/types/extractor.ts
+++ /dev/null
@@ -1,56 +0,0 @@
-import type { Engines } from 'fast-npm-meta'
-
-export type {
-  Node as JsonNode,
-} from 'jsonc-parser'
-
-export type {
-  Node as YamlNode,
-} from 'yaml'
-
-export type OffsetRange = [start: number, end: number]
-
-export type DependencyCategory
-  = | 'dependencies'
-    | 'devDependencies'
-    | 'peerDependencies'
-    | 'optionalDependencies'
-    | 'catalog'
-    | 'catalogs'
-
-export interface DependencyInfo {
-  category: DependencyCategory
-  categoryName?: string
-  rawName: string
-  rawSpec: string
-  nameRange: OffsetRange
-  specRange: OffsetRange
-}
-
-interface DependenciesInfo {
-  dependencies: DependencyInfo[]
-}
-
-export interface PackageManifestInfo extends DependenciesInfo {
-  name?: string
-  version?: string
-  packageManager?: string
-  engines?: Engines
-}
-
-export interface WorkspaceCatalogInfo extends DependenciesInfo {
-  catalogs?: Record<string, Record<string, string>>
-}
-
-export interface BaseExtractor<T = any> {
-  parse: (text: string) => T | null | undefined
-  getDependenciesInfo: (root: T) => DependencyInfo[]
-}
-
-export interface PackageManifestExtractor {
-  getPackageManifestInfo: (text: string) => PackageManifestInfo | undefined
-}
-
-export interface WorkspaceCatalogExtractor {
-  getWorkspaceCatalogInfo: (text: string) => WorkspaceCatalogInfo | undefined
-}
diff --git a/extensions/vscode/src/utils/ast.ts b/extensions/vscode/src/utils/ast.ts
index 87c312a..bad283a 100644
--- a/extensions/vscode/src/utils/ast.ts
+++ b/extensions/vscode/src/utils/ast.ts
@@ -1,4 +1,4 @@
-import type { OffsetRange } from '#types/extractor'
+import type { OffsetRange } from 'npmx-language-core/types'
 import type { TextDocument } from 'vscode'
 import { Range } from 'vscode'
 
diff --git a/shared/constants.ts b/extensions/vscode/src/utils/constants.ts
similarity index 61%
rename from shared/constants.ts
rename to extensions/vscode/src/utils/constants.ts
index 7c4c2a2..5f95e63 100644
--- a/shared/constants.ts
+++ b/extensions/vscode/src/utils/constants.ts
@@ -1,7 +1,6 @@
-export const PACKAGE_JSON_BASENAME = 'package.json'
-export const PNPM_WORKSPACE_BASENAME = 'pnpm-workspace.yaml'
-export const YARN_WORKSPACE_BASENAME = '.yarnrc.yml'
+import { PACKAGE_JSON_BASENAME, PNPM_WORKSPACE_BASENAME, YARN_WORKSPACE_BASENAME } from 'npmx-language-core/constants'
 
+export const PACKAGE_JSON_PATTERN = `**/${PACKAGE_JSON_BASENAME}`
 export const SUPPORTED_DOCUMENT_PATTERN = `**/{${PACKAGE_JSON_BASENAME},${PNPM_WORKSPACE_BASENAME},${YARN_WORKSPACE_BASENAME}}`
 
 export const PRERELEASE_PATTERN = /-.+/
@@ -10,5 +9,3 @@ export const CACHE_MAX_AGE_ONE_DAY = 60 * 60 * 24
 
 export const NPMX_DEV = 'https://npmx.dev'
 export const NPMX_DEV_API = `${NPMX_DEV}/api`
-
-export const SPACER = '&nbsp;'
diff --git a/extensions/vscode/src/utils/file.ts b/extensions/vscode/src/utils/file.ts
index 7e1ac76..be670b5 100644
--- a/extensions/vscode/src/utils/file.ts
+++ b/extensions/vscode/src/utils/file.ts
@@ -1,6 +1,6 @@
-import type { PackageManifestInfo } from '#types/extractor'
+import type { PackageManifestInfo } from 'npmx-language-core/types'
 import type { TextDocument, Uri } from 'vscode'
-import { PACKAGE_JSON_BASENAME, PNPM_WORKSPACE_BASENAME, YARN_WORKSPACE_BASENAME } from '#shared/constants'
+import { PACKAGE_JSON_BASENAME, PNPM_WORKSPACE_BASENAME, YARN_WORKSPACE_BASENAME } from 'npmx-language-core/constants'
 import { basename } from 'pathe'
 import { workspace } from 'vscode'
 
diff --git a/extensions/vscode/src/utils/ignore.ts b/extensions/vscode/src/utils/ignore.ts
index 7777ebf..d7aa6a6 100644
--- a/extensions/vscode/src/utils/ignore.ts
+++ b/extensions/vscode/src/utils/ignore.ts
@@ -1,4 +1,4 @@
-import { formatPackageId, parsePackageId } from './package'
+import { formatPackageId, parsePackageId } from 'npmx-language-core/utils'
 
 export function checkIgnored(options: {
   ignoreList: string[]
diff --git a/extensions/vscode/src/utils/links.ts b/extensions/vscode/src/utils/links.ts
index 4d070d6..ef5bc12 100644
--- a/extensions/vscode/src/utils/links.ts
+++ b/extensions/vscode/src/utils/links.ts
@@ -1,4 +1,4 @@
-import { NPMX_DEV } from '#shared/constants'
+import { NPMX_DEV } from '#utils/constants'
 
 const SPACES = /\s+/g
 
diff --git a/extensions/vscode/src/utils/package.test.ts b/extensions/vscode/src/utils/package.test.ts
index 02cdf92..5954c0c 100644
--- a/extensions/vscode/src/utils/package.test.ts
+++ b/extensions/vscode/src/utils/package.test.ts
@@ -1,6 +1,6 @@
 import type { PackageInfo } from '#api/package'
 import { describe, expect, it } from 'vitest'
-import { encodePackageName, isJsrNpmPackage, jsrNpmToJsrName, parsePackageId, resolveExactVersion } from './package'
+import { encodePackageName, resolveExactVersion } from './package'
 
 describe('encodePackageName', () => {
   it('should encode regular package name', () => {
@@ -12,48 +12,6 @@ describe('encodePackageName', () => {
   })
 })
 
-describe('isJsrNpmPackage', () => {
-  it('should detect @jsr/ scoped packages', () => {
-    expect(isJsrNpmPackage('@jsr/luca__cases')).toBe(true)
-    expect(isJsrNpmPackage('@jsr/std__path')).toBe(true)
-  })
-
-  it('should not detect non-jsr packages', () => {
-    expect(isJsrNpmPackage('lodash')).toBe(false)
-    expect(isJsrNpmPackage('@types/node')).toBe(false)
-  })
-})
-
-describe('jsrNpmToJsrName', () => {
-  it('should convert @jsr/ npm name to JSR name', () => {
-    expect(jsrNpmToJsrName('@jsr/luca__cases')).toBe('@luca/cases')
-    expect(jsrNpmToJsrName('@jsr/std__path')).toBe('@std/path')
-  })
-})
-
-describe('parsePackageId', () => {
-  it('should parse package id with version', () => {
-    expect(parsePackageId('lodash@4.17.21')).toEqual({
-      name: 'lodash',
-      version: '4.17.21',
-    })
-  })
-
-  it('should parse scoped package id with version', () => {
-    expect(parsePackageId('@babel/core@7.0.0')).toEqual({
-      name: '@babel/core',
-      version: '7.0.0',
-    })
-  })
-
-  it('should keep package name when version is missing', () => {
-    expect(parsePackageId('@babel/core')).toEqual({
-      name: '@babel/core',
-      version: null,
-    })
-  })
-})
-
 describe('resolveExactVersion', () => {
   it.each([
     ['', '4.10.0'],
diff --git a/extensions/vscode/src/utils/package.ts b/extensions/vscode/src/utils/package.ts
index b7307df..dea3349 100644
--- a/extensions/vscode/src/utils/package.ts
+++ b/extensions/vscode/src/utils/package.ts
@@ -15,47 +15,6 @@ export function encodePackageName(name: string): string {
   return encodeURIComponent(name)
 }
 
-const JSR_NPM_SCOPE = '@jsr/'
-
-export function isJsrNpmPackage(name: string): boolean {
-  return name.startsWith(JSR_NPM_SCOPE)
-}
-
-export function jsrNpmToJsrName(name: string): string {
-  if (!isJsrNpmPackage(name))
-    return name
-
-  const bare = name.slice(JSR_NPM_SCOPE.length)
-  const separatorIndex = bare.indexOf('__')
-  if (separatorIndex === -1)
-    return bare
-  return `@${bare.slice(0, separatorIndex)}/${bare.slice(separatorIndex + 2)}`
-}
-
-export function formatPackageId(name: string, version: string): string {
-  return `${name}@${version}`
-}
-
-interface ParsedPackageId {
-  name: string
-  version: string | null
-}
-
-export function parsePackageId(id: string): ParsedPackageId {
-  const separatorIndex = id.lastIndexOf('@')
-  if (separatorIndex <= 0) {
-    return {
-      name: id,
-      version: null,
-    }
-  }
-
-  return {
-    name: id.slice(0, separatorIndex),
-    version: id.slice(separatorIndex + 1) || null,
-  }
-}
-
 /**
  * Resolve the maximum version satisfying the given range, capped by the `latest` dist-tag when possible.
  *
diff --git a/extensions/vscode/src/utils/version.test.ts b/extensions/vscode/src/utils/version.test.ts
index 7b954d2..f275dcb 100644
--- a/extensions/vscode/src/utils/version.test.ts
+++ b/extensions/vscode/src/utils/version.test.ts
@@ -1,4 +1,4 @@
-import type { ResolvedDependencyInfo } from '#types/context'
+import type { DependencyInfo } from '#core/workspace'
 import { describe, expect, it } from 'vitest'
 import { formatUpgradeVersion } from './version'
 
@@ -19,7 +19,7 @@ describe('formatUpgradeVersion', () => {
     [['^1.0.0', 'npm:foo@^1.0.0', 'my-foo'], '2.0.0', 'npm:foo@^2.0.0'],
   ])('should preserve $0', ([resolvedSpec, rawSpec = resolvedSpec, rawName = 'foo', protocol = 'npm'], target, expected) => {
     expect(
-      formatUpgradeVersion({ protocol, rawName, rawSpec, resolvedName: 'foo', resolvedSpec } as ResolvedDependencyInfo, target),
+      formatUpgradeVersion({ protocol, rawName, rawSpec, resolvedName: 'foo', resolvedSpec } as DependencyInfo, target),
     ).toBe(expected)
   })
 })
diff --git a/extensions/vscode/src/utils/version.ts b/extensions/vscode/src/utils/version.ts
index 6e433b6..1db0393 100644
--- a/extensions/vscode/src/utils/version.ts
+++ b/extensions/vscode/src/utils/version.ts
@@ -1,5 +1,5 @@
-import type { ResolvedDependencyInfo } from '#types/context'
-import { formatPackageId } from './package'
+import type { DependencyInfo } from '#core/workspace'
+import { formatPackageId } from 'npmx-language-core/utils'
 
 const RANGE_PREFIXES = ['>=', '<=', '=', '>', '<']
 
@@ -29,7 +29,7 @@ function getVersionRangePrefix(v: string): string {
 
 const PROTOCOL_PATTERN = /^[a-z]+:/
 
-export function formatUpgradeVersion(dep: ResolvedDependencyInfo, target: string): string {
+export function formatUpgradeVersion(dep: DependencyInfo, target: string): string {
   const { rawName, rawSpec, resolvedName, resolvedSpec, protocol } = dep
 
   const isAlias = resolvedName !== rawName
diff --git a/extensions/vscode/tests/__setup__/msw.ts b/extensions/vscode/tests/__setup__/msw.ts
index 82da395..43e6912 100644
--- a/extensions/vscode/tests/__setup__/msw.ts
+++ b/extensions/vscode/tests/__setup__/msw.ts
@@ -1,4 +1,4 @@
-import { NPMX_DEV_API } from '#shared/constants'
+import { NPMX_DEV_API } from '#utils/constants'
 import { all } from 'module-replacements'
 import { http, HttpResponse } from 'msw'
 import { setupServer } from 'msw/node'
diff --git a/extensions/vscode/tsdown.config.ts b/extensions/vscode/tsdown.config.ts
index 39000d6..db46a2b 100644
--- a/extensions/vscode/tsdown.config.ts
+++ b/extensions/vscode/tsdown.config.ts
@@ -1,13 +1,7 @@
-import { resolve } from 'node:path'
 import { defineConfig } from 'tsdown'
 
 /// keep-sorted
 export default defineConfig({
-  alias: {
-    // defaults to bundle the UMD entry point and generate incorrect output.
-    // so explicitly specifying a fixed entry point here.
-    'jsonc-parser': resolve('./node_modules/jsonc-parser/lib/esm/main.js'),
-  },
   copy: [
     '../../res',
   ],
@@ -16,7 +10,6 @@ export default defineConfig({
     /// keep-sorted
     onlyBundle: [
       'fast-npm-meta',
-      'jsonc-parser',
       'ocache',
       'ofetch',
       'ohash',
@@ -24,7 +17,6 @@ export default defineConfig({
       'perfect-debounce',
       'semver',
       'vscode-find-up',
-      'yaml',
       /reactive-vscode/,
     ],
   },
diff --git a/packages/language-core/package.json b/packages/language-core/package.json
new file mode 100644
index 0000000..64e9785
--- /dev/null
+++ b/packages/language-core/package.json
@@ -0,0 +1,37 @@
+{
+  "name": "npmx-language-core",
+  "type": "module",
+  "version": "0.7.0",
+  "private": true,
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/npmx-dev/vscode-npmx.git",
+    "directory": "packages/language-core"
+  },
+  "sideEffects": false,
+  "exports": {
+    "./constants": "./dist/constants.js",
+    "./extractors": "./dist/extractors/index.js",
+    "./types": "./dist/types.js",
+    "./utils": "./dist/utils/index.js",
+    "./package.json": "./package.json"
+  },
+  "files": [
+    "dist/**/*"
+  ],
+  "scripts": {
+    "dev": "tsdown --watch",
+    "build": "tsdown"
+  },
+  "devDependencies": {
+    "jsonc-parser": "catalog:inline",
+    "pathe": "catalog:inline",
+    "yaml": "catalog:inline"
+  },
+  "inlinedDependencies": {
+    "jsonc-parser": "3.3.1",
+    "yaml": "2.8.2",
+    "pathe": "2.0.3"
+  }
+}
diff --git a/packages/language-core/src/constants.ts b/packages/language-core/src/constants.ts
new file mode 100644
index 0000000..9292139
--- /dev/null
+++ b/packages/language-core/src/constants.ts
@@ -0,0 +1,3 @@
+export const PACKAGE_JSON_BASENAME = 'package.json'
+export const PNPM_WORKSPACE_BASENAME = 'pnpm-workspace.yaml'
+export const YARN_WORKSPACE_BASENAME = '.yarnrc.yml'
diff --git a/extensions/vscode/src/core/extractors/index.ts b/packages/language-core/src/extractors/index.ts
similarity index 100%
rename from extensions/vscode/src/core/extractors/index.ts
rename to packages/language-core/src/extractors/index.ts
diff --git a/extensions/vscode/src/core/extractors/json.ts b/packages/language-core/src/extractors/json.ts
similarity index 89%
rename from extensions/vscode/src/core/extractors/json.ts
rename to packages/language-core/src/extractors/json.ts
index a7d3de0..d56fd4e 100644
--- a/extensions/vscode/src/core/extractors/json.ts
+++ b/packages/language-core/src/extractors/json.ts
@@ -1,5 +1,5 @@
-import type { BaseExtractor, DependencyCategory, DependencyInfo, JsonNode, OffsetRange, PackageManifestExtractor, PackageManifestInfo } from '#types/extractor'
-import type { Engines } from 'fast-npm-meta'
+import type { Node as JsonNode } from 'jsonc-parser'
+import type { BaseExtractor, DependencyCategory, Engines, ExtractedDependencyInfo, OffsetRange, PackageManifestExtractor, PackageManifestInfo } from '../types'
 import { findNodeAtLocation, parseTree } from 'jsonc-parser'
 
 const DEPENDENCY_SECTIONS: DependencyCategory[] = [
@@ -21,7 +21,7 @@ export class JsonExtractor implements PackageManifestExtractor, BaseExtractor<Js
     return [node.offset + 1, node.offset + node.length - 1]
   }
 
-  #parseDependencyNode(node: JsonNode, category: DependencyCategory): DependencyInfo | undefined {
+  #parseDependencyNode(node: JsonNode, category: DependencyCategory): ExtractedDependencyInfo | undefined {
     if (!node.children?.length)
       return
 
@@ -63,7 +63,7 @@ export class JsonExtractor implements PackageManifestExtractor, BaseExtractor<Js
   }
 
   getDependenciesInfo(root: JsonNode) {
-    const result: DependencyInfo[] = []
+    const result: ExtractedDependencyInfo[] = []
 
     DEPENDENCY_SECTIONS.forEach((section) => {
       const node = findNodeAtLocation(root, [section])
diff --git a/extensions/vscode/src/core/extractors/yaml.ts b/packages/language-core/src/extractors/yaml.ts
similarity index 88%
rename from extensions/vscode/src/core/extractors/yaml.ts
rename to packages/language-core/src/extractors/yaml.ts
index ae75337..e3fdda2 100644
--- a/extensions/vscode/src/core/extractors/yaml.ts
+++ b/packages/language-core/src/extractors/yaml.ts
@@ -1,7 +1,7 @@
-import type { BaseExtractor, DependencyInfo, OffsetRange, WorkspaceCatalogExtractor, WorkspaceCatalogInfo, YamlNode } from '#types/extractor'
-import type { Pair, Scalar, YAMLMap } from 'yaml'
-import { normalizeCatalogName } from '#utils/dependency'
+import type { Pair, Scalar, YAMLMap, Node as YamlNode } from 'yaml'
+import type { BaseExtractor, ExtractedDependencyInfo, OffsetRange, WorkspaceCatalogExtractor, WorkspaceCatalogInfo } from '../types'
 import { isMap, isPair, isScalar, parseDocument } from 'yaml'
+import { normalizeCatalogName } from '../utils'
 
 const CATALOG_SECTION = 'catalog'
 const CATALOGS_SECTION = 'catalogs'
@@ -64,11 +64,11 @@ export class YamlExtractor implements WorkspaceCatalogExtractor, BaseExtractor<Y
     return false
   }
 
-  getDependenciesInfo(root: YamlNode): DependencyInfo[] {
+  getDependenciesInfo(root: YamlNode): ExtractedDependencyInfo[] {
     if (!isMap(root))
       return []
 
-    const result: DependencyInfo[] = []
+    const result: ExtractedDependencyInfo[] = []
 
     this.#traverseCatalogs(root, (item, meta) => {
       result.push({
diff --git a/packages/language-core/src/types.ts b/packages/language-core/src/types.ts
new file mode 100644
index 0000000..78f236c
--- /dev/null
+++ b/packages/language-core/src/types.ts
@@ -0,0 +1,68 @@
+export type OffsetRange = [start: number, end: number]
+
+export type DependencyProtocol
+  = | 'npm'
+    | 'jsr'
+    | 'workspace'
+    | 'catalog'
+    | 'git'
+    | 'file'
+    | 'http'
+    | null
+
+export type DependencyCategory
+  = | 'dependencies'
+    | 'devDependencies'
+    | 'peerDependencies'
+    | 'optionalDependencies'
+    | 'catalog'
+    | 'catalogs'
+
+export interface ExtractedDependencyInfo {
+  category: DependencyCategory
+  categoryName?: string
+  rawName: string
+  rawSpec: string
+  nameRange: OffsetRange
+  specRange: OffsetRange
+}
+
+export interface ResolvedDependencyInfo {
+  protocol: DependencyProtocol
+  categoryName?: string
+  resolvedName: string
+  resolvedSpec: string
+  resolvedProtocol: string
+}
+
+interface HasDependenciesInfo {
+  dependencies: ExtractedDependencyInfo[]
+}
+
+export type Engines = Record<string, string>
+
+export interface PackageManifestInfo extends HasDependenciesInfo {
+  name?: string
+  version?: string
+  packageManager?: string
+  engines?: Engines
+}
+
+export type CatalogsInfo = Record<string, Record<string, string>>
+
+export interface WorkspaceCatalogInfo extends HasDependenciesInfo {
+  catalogs?: CatalogsInfo
+}
+
+export interface BaseExtractor<T = unknown> {
+  parse: (text: string) => T | null | undefined
+  getDependenciesInfo: (root: T) => ExtractedDependencyInfo[]
+}
+
+export interface PackageManifestExtractor {
+  getPackageManifestInfo: (text: string) => PackageManifestInfo | undefined
+}
+
+export interface WorkspaceCatalogExtractor {
+  getWorkspaceCatalogInfo: (text: string) => WorkspaceCatalogInfo | undefined
+}
diff --git a/packages/language-core/src/utils/catalog.ts b/packages/language-core/src/utils/catalog.ts
new file mode 100644
index 0000000..5239b67
--- /dev/null
+++ b/packages/language-core/src/utils/catalog.ts
@@ -0,0 +1,3 @@
+export function normalizeCatalogName(name: string): string {
+  return name.trim() || 'default'
+}
diff --git a/extensions/vscode/src/utils/dependency.test.ts b/packages/language-core/src/utils/dependency.test.ts
similarity index 100%
rename from extensions/vscode/src/utils/dependency.test.ts
rename to packages/language-core/src/utils/dependency.test.ts
diff --git a/extensions/vscode/src/utils/dependency.ts b/packages/language-core/src/utils/dependency.ts
similarity index 85%
rename from extensions/vscode/src/utils/dependency.ts
rename to packages/language-core/src/utils/dependency.ts
index acc43c8..079e558 100644
--- a/extensions/vscode/src/utils/dependency.ts
+++ b/packages/language-core/src/utils/dependency.ts
@@ -1,20 +1,12 @@
-import type { CatalogsInfo, ResolvedDependencyInfo } from '#types/context'
-import { isJsrNpmPackage, jsrNpmToJsrName, parsePackageId } from '#utils/package'
+import type { CatalogsInfo, ResolvedDependencyInfo } from '../types'
+import { normalizeCatalogName } from './catalog'
+import { isJsrNpmPackage, jsrNpmToJsrName, parsePackageId } from './package'
 
-interface FinalResolution extends Pick<ResolvedDependencyInfo, 'resolvedName' | 'resolvedSpec' | 'resolvedProtocol'> {
-}
-
-interface DependencySpecResolution extends FinalResolution, Pick<ResolvedDependencyInfo, 'protocol' | 'categoryName'> {
-}
+type FinalResolution = Pick<ResolvedDependencyInfo, 'resolvedName' | 'resolvedSpec' | 'resolvedProtocol'>
 
-const DEFAULT_CATALOG_NAME = 'default'
 const GIT_PATTERN = /^(?:git\+|git:\/\/|github:|gitlab:|bitbucket:|ssh:\/\/git@)/i
 const HTTP_PATTERN = /^https?:/i
 
-export function normalizeCatalogName(name: string): string {
-  return name.trim() || DEFAULT_CATALOG_NAME
-}
-
 function resolveNpmSpec(rawName: string, spec: string): FinalResolution {
   const alias = parsePackageId(spec)
   if (!alias.version) {
@@ -108,7 +100,7 @@ function resolveEffectiveSpec(rawName: string, rawSpec: string, catalogs?: Catal
   }
 }
 
-export function resolveDependencySpec(rawName: string, rawSpec: string, catalogs: CatalogsInfo = {}): DependencySpecResolution {
+export function resolveDependencySpec(rawName: string, rawSpec: string, catalogs: CatalogsInfo = {}): ResolvedDependencyInfo {
   const spec = rawSpec.trim()
   const effective = resolveEffectiveSpec(rawName, rawSpec, catalogs)
 
diff --git a/packages/language-core/src/utils/index.ts b/packages/language-core/src/utils/index.ts
new file mode 100644
index 0000000..e6058e0
--- /dev/null
+++ b/packages/language-core/src/utils/index.ts
@@ -0,0 +1,3 @@
+export * from './catalog'
+export * from './dependency'
+export * from './package'
diff --git a/packages/language-core/src/utils/package.test.ts b/packages/language-core/src/utils/package.test.ts
new file mode 100644
index 0000000..2fcae8f
--- /dev/null
+++ b/packages/language-core/src/utils/package.test.ts
@@ -0,0 +1,44 @@
+import { describe, expect, it } from 'vitest'
+import { isJsrNpmPackage, jsrNpmToJsrName, parsePackageId } from './package'
+
+describe('parsePackageId', () => {
+  it('should parse package id with version', () => {
+    expect(parsePackageId('lodash@4.17.21')).toEqual({
+      name: 'lodash',
+      version: '4.17.21',
+    })
+  })
+
+  it('should parse scoped package id with version', () => {
+    expect(parsePackageId('@babel/core@7.0.0')).toEqual({
+      name: '@babel/core',
+      version: '7.0.0',
+    })
+  })
+
+  it('should keep package name when version is missing', () => {
+    expect(parsePackageId('@babel/core')).toEqual({
+      name: '@babel/core',
+      version: null,
+    })
+  })
+})
+
+describe('isJsrNpmPackage', () => {
+  it('should detect @jsr/ scoped packages', () => {
+    expect(isJsrNpmPackage('@jsr/luca__cases')).toBe(true)
+    expect(isJsrNpmPackage('@jsr/std__path')).toBe(true)
+  })
+
+  it('should not detect non-jsr packages', () => {
+    expect(isJsrNpmPackage('lodash')).toBe(false)
+    expect(isJsrNpmPackage('@types/node')).toBe(false)
+  })
+})
+
+describe('jsrNpmToJsrName', () => {
+  it('should convert @jsr/ npm name to JSR name', () => {
+    expect(jsrNpmToJsrName('@jsr/luca__cases')).toBe('@luca/cases')
+    expect(jsrNpmToJsrName('@jsr/std__path')).toBe('@std/path')
+  })
+})
diff --git a/packages/language-core/src/utils/package.ts b/packages/language-core/src/utils/package.ts
new file mode 100644
index 0000000..c4f6725
--- /dev/null
+++ b/packages/language-core/src/utils/package.ts
@@ -0,0 +1,38 @@
+export function formatPackageId(name: string, version: string): string {
+  return `${name}@${version}`
+}
+
+export function parsePackageId(id: string): {
+  name: string
+  version: string | null
+} {
+  const separatorIndex = id.lastIndexOf('@')
+  if (separatorIndex <= 0) {
+    return {
+      name: id,
+      version: null,
+    }
+  }
+
+  return {
+    name: id.slice(0, separatorIndex),
+    version: id.slice(separatorIndex + 1) || null,
+  }
+}
+
+const JSR_NPM_SCOPE = '@jsr/'
+
+export function isJsrNpmPackage(name: string): boolean {
+  return name.startsWith(JSR_NPM_SCOPE)
+}
+
+export function jsrNpmToJsrName(name: string): string {
+  if (!isJsrNpmPackage(name))
+    return name
+
+  const bare = name.slice(JSR_NPM_SCOPE.length)
+  const separatorIndex = bare.indexOf('__')
+  if (separatorIndex === -1)
+    return bare
+  return `@${bare.slice(0, separatorIndex)}/${bare.slice(separatorIndex + 2)}`
+}
diff --git a/packages/language-core/tsconfig.json b/packages/language-core/tsconfig.json
new file mode 100644
index 0000000..543e361
--- /dev/null
+++ b/packages/language-core/tsconfig.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tsbuildinfo"
+  },
+  "include": [
+    "src"
+  ]
+}
diff --git a/packages/language-core/tsdown.config.ts b/packages/language-core/tsdown.config.ts
new file mode 100644
index 0000000..d9b6a29
--- /dev/null
+++ b/packages/language-core/tsdown.config.ts
@@ -0,0 +1,29 @@
+import { resolve } from 'node:path'
+import { defineConfig } from 'tsdown'
+
+export default defineConfig({
+  alias: {
+    // defaults to bundle the UMD entry point and generate incorrect output.
+    // so explicitly specifying a fixed entry point here.
+    'jsonc-parser': resolve('./node_modules/jsonc-parser/lib/esm/main.js'),
+  },
+  /// keep-sorted
+  entry: [
+    'src/constants.ts',
+    'src/extractors/index.ts',
+    'src/types.ts',
+    'src/utils/index.ts',
+  ],
+  platform: 'neutral',
+  exports: true,
+  dts: true,
+  minify: 'dce-only',
+  deps: {
+    /// keep-sorted
+    onlyBundle: [
+      'jsonc-parser',
+      'pathe',
+      'yaml',
+    ],
+  },
+})
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index c8a9c41..06cf9b2 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -139,9 +139,9 @@ importers:
       fast-npm-meta:
         specifier: catalog:inline
         version: 1.4.2
-      jsonc-parser:
-        specifier: catalog:inline
-        version: 3.3.1
+      npmx-language-core:
+        specifier: workspace:*
+        version: link:../../packages/language-core
       ocache:
         specifier: catalog:inline
         version: 0.1.2
@@ -166,6 +166,15 @@ importers:
       vscode-find-up:
         specifier: catalog:inline
         version: 0.1.1(@types/vscode@1.101.0)
+
+  packages/language-core:
+    devDependencies:
+      jsonc-parser:
+        specifier: catalog:inline
+        version: 3.3.1
+      pathe:
+        specifier: catalog:inline
+        version: 2.0.3
       yaml:
         specifier: catalog:inline
         version: 2.8.2
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index 81764ca..c76eaab 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -3,6 +3,7 @@ trustPolicy: no-downgrade
 
 packages:
   - extensions/*
+  - packages/*
 
 catalogs:
   dev:
diff --git a/tsconfig.json b/tsconfig.json
index 809b99e..aa57184 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,7 @@
 {
   "references": [
-    { "path": "./extensions/vscode/tsconfig.json" }
+    { "path": "./extensions/vscode/tsconfig.json" },
+    { "path": "./packages/language-core/tsconfig.json" }
   ],
   "files": []
 }
diff --git a/vitest.config.ts b/vitest.config.ts
index 241121a..f7370b4 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -5,6 +5,7 @@ export default defineConfig({
     include: ['**/*.test.ts'],
     projects: [
       'extensions/*',
+      'packages/*',
     ],
   },
 })