@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

3.5.13 (2024-11-15)

Bug Fixes

• compiler-core: handle v-memo + v-for with functional key (#12014) (99009ee), closes #12013
• compiler-dom: properly stringify template string style (#12392) (2d78539), closes #12391
• custom-element: avoid triggering mutationObserver when relecting props (352bc88), closes #12214 #12215
• deps: update dependency postcss to ^8.4.48 (#12356) (b5ff930)
• hydration: the component vnode's el should be updated when a mismatch occurs. (#12255) (a20a4cb), closes #12253
• reactiivty: avoid unnecessary watcher effect removal from inactive scope (2193284), closes #5783 #5806
• reactivity: release nested effects/scopes on effect scope stop (#12373) (bee2f5e), closes #12370
• runtime-dom: set css vars before user onMounted hooks (2d5c5e2), closes #11533
• runtime-dom: set css vars on update to handle child forcing reflow in onMount (#11561) (c4312f9)
• ssr: avoid updating subtree of async component if it is resolved (#12363) (da7ad5e), closes #12362
• ssr: ensure v-text updates correctly with custom directives in SSR output (#12311) (1f75d4e), closes #12309
• ssr: handle initial selected state for select with v-model + v-for option (#12399) (4f8d807), closes #12395
• teleport: handle deferred teleport update before mounted (#12168) (8bff142), closes #12161
• templateRef: set ref on cached async component which wrapped in KeepAlive (#12290) (983eb50), closes #4999 #5004
• test: update snapshot (#12169) (828d4a4)
• Transition: fix transition memory leak edge case (#12182) (660132d), closes #12181
• transition: reflow before leave-active class after leave-from (#12288) (4b479db), closes #2593
• types: defineEmits w/ interface declaration (#12343) (1022eab), closes #8457
• v-once: setting hasOnce to current block only when in v-once (#12374) (37300fc), closes #12371

Performance Improvements

• reactivity: do not track inner key `__v_skip`` (#11690) (d637bd6)
• runtime-core: use feature flag for call to resolveMergedOptions (#12163) (1755ac0)