@vue/compiler-core

What is @vue/compiler-core?

The @vue/compiler-core package is a lower-level utility for compiling Vue.js templates into render functions. It is part of the Vue.js framework and is used internally by higher-level tools like vue-loader or @vue/compiler-sfc. It provides the core algorithms for parsing template syntax and generating JavaScript code from templates.

What are @vue/compiler-core's main functionalities?

Parsing Template Syntax

This feature allows you to parse Vue template syntax into an Abstract Syntax Tree (AST). The AST can then be manipulated or compiled into render functions.

import { baseParse } from '@vue/compiler-core';
const ast = baseParse('<div>Hello, {{ world }}</div>');

Compiling AST to Render Functions

This feature takes an AST and compiles it into JavaScript render functions, which can be used to render Vue components.

import { baseCompile } from '@vue/compiler-core';
const { code } = baseCompile('<div>Hello, {{ world }}</div>');

Transforming AST Nodes

This feature allows you to apply custom transformations to AST nodes. In this example, we're changing the content of an interpolation from 'world' to 'universe'.

import { transform } from '@vue/compiler-core';
import { createSimpleExpression } from '@vue/compiler-core';

const ast = baseParse('<div>Hello, {{ world }}</div>');
transform(ast, {
  nodeTransforms: [
    (node) => {
      if (node.type === 5 /* INTERPOLATION */) {
        node.content = createSimpleExpression('universe', false);
      }
    }
  ]
});

Other packages similar to @vue/compiler-core

babel-core

Babel is a JavaScript compiler that includes capabilities for transforming syntax. While it is not specific to Vue, it provides similar functionality in terms of parsing code and generating abstract syntax trees, which can then be transformed and compiled.

typescript

TypeScript is a superset of JavaScript that compiles to plain JavaScript. It includes a compiler that can parse TypeScript code, perform type checking, and output JavaScript code. It is similar to @vue/compiler-core in that it involves a compilation step, but it is focused on type safety and JavaScript rather than Vue templates.

svelte

Svelte is a compiler for building user interfaces. It compiles Svelte components, which are written in a syntax similar to Vue's, into efficient JavaScript code. Like @vue/compiler-core, Svelte provides a way to compile declarative components into imperative code that can be executed in the browser.

README

@vue/compiler-core

Changelog

3.5.21 (2025-09-02)

Bug Fixes

• compiler-core: force dynamic slots when slot referencing scope vars (#9427) (99d54b2), closes #9380
• compiler-sfc: check lang before attempt to compile script (#13508) (55922ff), closes #8368
• compiler-sfc: support ${configDir} in paths for TypeScript 5.5+ (#13491) (8696e34), closes #13484
• compiler-sfc: support global augments with named exports (#13789) (35da3c6)
• custom-element: prevent defineCustomElement from mutating the options object (#13791) (e322436)
• hmr: prevent __VUE_HMR_RUNTIME__ from being overwritten by vue runtime in 3rd-party libraries (#13817) (1392734), closes vitejs/vite-plugin-vue#644
• hmr: prevent update unmounting component during HMR reload (#13815) (ef20b86), closes vitejs/vite-plugin-vue#599
• runtime-core: disable tracking block in h function (#8213) (8f6b505), closes #6913
• runtime-core: use separate emits caches for components and mixins (#11661) (15fc75f)
• Suspence: handle Suspense + KeepAlive HMR updating edge case (#13076) (5d75a17), closes #13075
• Teleport: hydrate disabled Teleport with undefined target (#11235) (00978f7), closes #11230
• templateRef: prevent unnecessary set ref on dynamic ref change or component unmount (#12642) (93ba107), closes #12639
• watch: use maximum depth for duplicates (#13434) (f2699a5)

Performance Improvements

• improve regexp performance with non-capturing groups (#13567) (1e8b65a)