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fix(compiler-core): hoisted vnode calls and scoped id calls should be marked pure

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Otherwise they cannot be tree-shaken
This commit is contained in:
Evan You 2020-05-01 17:34:11 -04:00
parent 6c60ce13e0
commit cad25d95a3
5 changed files with 45 additions and 34 deletions
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24
packages/compiler-core/__tests__/__snapshots__/scopeId.spec.ts.snap
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@ -2,14 +2,14 @@
exports[`scopeId compiler support should push scopeId for hoisted nodes 1`] = `
"import { createVNode as _createVNode, toDisplayString as _toDisplayString, createTextVNode as _createTextVNode, openBlock as _openBlock, createBlock as _createBlock, withScopeId as _withScopeId, pushScopeId as _pushScopeId, popScopeId as _popScopeId } from \\"vue\\"
const _withId = _withScopeId(\\"test\\")
const _withId = /*#__PURE__*/ _withScopeId(\\"test\\")
_pushScopeId(\\"test\\")
const _hoisted_1 = _createVNode(\\"div\\", null, \\"hello\\", -1 /* HOISTED */)
const _hoisted_2 = _createVNode(\\"div\\", null, \\"world\\", -1 /* HOISTED */)
const _hoisted_1 = /*#__PURE__*/ _createVNode(\\"div\\", null, \\"hello\\", -1 /* HOISTED */)
const _hoisted_2 = /*#__PURE__*/ _createVNode(\\"div\\", null, \\"world\\", -1 /* HOISTED */)
_popScopeId()
export const render = _withId(function render(_ctx, _cache) {
export const render = /*#__PURE__*/ _withId(function render(_ctx, _cache) {
return (_openBlock(), _createBlock(\\"div\\", null, [
_hoisted_1,
_createTextVNode(_toDisplayString(_ctx.foo), 1 /* TEXT */),
@ -20,9 +20,9 @@ export const render = _withId(function render(_ctx, _cache) {
exports[`scopeId compiler support should wrap default slot 1`] = `
"import { createVNode as _createVNode, resolveComponent as _resolveComponent, withCtx as _withCtx, openBlock as _openBlock, createBlock as _createBlock, withScopeId as _withScopeId } from \\"vue\\"
const _withId = _withScopeId(\\"test\\")
const _withId = /*#__PURE__*/ _withScopeId(\\"test\\")
export const render = _withId(function render(_ctx, _cache) {
export const render = /*#__PURE__*/ _withId(function render(_ctx, _cache) {
const _component_Child = _resolveComponent(\\"Child\\")
return (_openBlock(), _createBlock(_component_Child, null, {
@ -36,9 +36,9 @@ export const render = _withId(function render(_ctx, _cache) {
exports[`scopeId compiler support should wrap dynamic slots 1`] = `
"import { createVNode as _createVNode, resolveComponent as _resolveComponent, withCtx as _withCtx, renderList as _renderList, createSlots as _createSlots, openBlock as _openBlock, createBlock as _createBlock, withScopeId as _withScopeId } from \\"vue\\"
const _withId = _withScopeId(\\"test\\")
const _withId = /*#__PURE__*/ _withScopeId(\\"test\\")
export const render = _withId(function render(_ctx, _cache) {
export const render = /*#__PURE__*/ _withId(function render(_ctx, _cache) {
const _component_Child = _resolveComponent(\\"Child\\")
return (_openBlock(), _createBlock(_component_Child, null, _createSlots({ _: 1 }, [
@ -64,9 +64,9 @@ export const render = _withId(function render(_ctx, _cache) {
exports[`scopeId compiler support should wrap named slots 1`] = `
"import { toDisplayString as _toDisplayString, createTextVNode as _createTextVNode, createVNode as _createVNode, resolveComponent as _resolveComponent, withCtx as _withCtx, openBlock as _openBlock, createBlock as _createBlock, withScopeId as _withScopeId } from \\"vue\\"
const _withId = _withScopeId(\\"test\\")
const _withId = /*#__PURE__*/ _withScopeId(\\"test\\")
export const render = _withId(function render(_ctx, _cache) {
export const render = /*#__PURE__*/ _withId(function render(_ctx, _cache) {
const _component_Child = _resolveComponent(\\"Child\\")
return (_openBlock(), _createBlock(_component_Child, null, {
@ -83,9 +83,9 @@ export const render = _withId(function render(_ctx, _cache) {
exports[`scopeId compiler support should wrap render function 1`] = `
"import { createVNode as _createVNode, openBlock as _openBlock, createBlock as _createBlock, withScopeId as _withScopeId } from \\"vue\\"
const _withId = _withScopeId(\\"test\\")
const _withId = /*#__PURE__*/ _withScopeId(\\"test\\")
export const render = _withId(function render(_ctx, _cache) {
export const render = /*#__PURE__*/ _withId(function render(_ctx, _cache) {
return (_openBlock(), _createBlock(\\"div\\"))
})"
`;

10
packages/compiler-core/__tests__/scopeId.spec.ts
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@ -20,8 +20,10 @@ describe('scopeId compiler support', () => {
scopeId: 'test'
})
expect(ast.helpers).toContain(WITH_SCOPE_ID)
expect(code).toMatch(`const _withId = _withScopeId("test")`)
expect(code).toMatch(`export const render = _withId(function render(`)
expect(code).toMatch(`const _withId = /*#__PURE__*/ _withScopeId("test")`)
expect(code).toMatch(
`export const render = /*#__PURE__*/ _withId(function render(`
)
expect(code).toMatchSnapshot()
})
@ -83,10 +85,10 @@ describe('scopeId compiler support', () => {
expect(code).toMatch(
[
`_pushScopeId("test")`,
`const _hoisted_1 = _createVNode("div", null, "hello", ${genFlagText(
`const _hoisted_1 = /*#__PURE__*/ _createVNode("div", null, "hello", ${genFlagText(
PatchFlags.HOISTED
)})`,
`const _hoisted_2 = _createVNode("div", null, "world", ${genFlagText(
`const _hoisted_2 = /*#__PURE__*/ _createVNode("div", null, "world", ${genFlagText(
PatchFlags.HOISTED
)})`,
`_popScopeId()`

20
packages/compiler-core/__tests__/transforms/__snapshots__/hoistStatic.spec.ts.snap
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@ -4,7 +4,7 @@ exports[`compiler: hoistStatic transform hoist element with static key 1`] = `
"const _Vue = Vue
const { createVNode: _createVNode } = _Vue
const _hoisted_1 = _createVNode(\\"div\\", { key: \\"foo\\" }, null, -1 /* HOISTED */)
const _hoisted_1 = /*#__PURE__*/ _createVNode(\\"div\\", { key: \\"foo\\" }, null, -1 /* HOISTED */)
return function render(_ctx, _cache) {
with (_ctx) {
@ -21,7 +21,7 @@ exports[`compiler: hoistStatic transform hoist nested static tree 1`] = `
"const _Vue = Vue
const { createVNode: _createVNode } = _Vue
const _hoisted_1 = _createVNode(\\"p\\", null, [
const _hoisted_1 = /*#__PURE__*/ _createVNode(\\"p\\", null, [
_createVNode(\\"span\\"),
_createVNode(\\"span\\")
], -1 /* HOISTED */)
@ -41,7 +41,7 @@ exports[`compiler: hoistStatic transform hoist nested static tree with comments
"const _Vue = Vue
const { createVNode: _createVNode, createCommentVNode: _createCommentVNode } = _Vue
const _hoisted_1 = _createVNode(\\"div\\", null, [
const _hoisted_1 = /*#__PURE__*/ _createVNode(\\"div\\", null, [
_createCommentVNode(\\"comment\\")
], -1 /* HOISTED */)
@ -60,8 +60,8 @@ exports[`compiler: hoistStatic transform hoist siblings with common non-hoistabl
"const _Vue = Vue
const { createVNode: _createVNode } = _Vue
const _hoisted_1 = _createVNode(\\"span\\", null, null, -1 /* HOISTED */)
const _hoisted_2 = _createVNode(\\"div\\", null, null, -1 /* HOISTED */)
const _hoisted_1 = /*#__PURE__*/ _createVNode(\\"span\\", null, null, -1 /* HOISTED */)
const _hoisted_2 = /*#__PURE__*/ _createVNode(\\"div\\", null, null, -1 /* HOISTED */)
return function render(_ctx, _cache) {
with (_ctx) {
@ -79,7 +79,7 @@ exports[`compiler: hoistStatic transform hoist simple element 1`] = `
"const _Vue = Vue
const { createVNode: _createVNode } = _Vue
const _hoisted_1 = _createVNode(\\"span\\", { class: \\"inline\\" }, \\"hello\\", -1 /* HOISTED */)
const _hoisted_1 = /*#__PURE__*/ _createVNode(\\"span\\", { class: \\"inline\\" }, \\"hello\\", -1 /* HOISTED */)
return function render(_ctx, _cache) {
with (_ctx) {
@ -172,7 +172,7 @@ exports[`compiler: hoistStatic transform prefixIdentifiers hoist nested static t
"const _Vue = Vue
const { createVNode: _createVNode } = _Vue
const _hoisted_1 = _createVNode(\\"span\\", null, \\"foo \\" + _toDisplayString(1) + \\" \\" + _toDisplayString(true), -1 /* HOISTED */)
const _hoisted_1 = /*#__PURE__*/ _createVNode(\\"span\\", null, \\"foo \\" + _toDisplayString(1) + \\" \\" + _toDisplayString(true), -1 /* HOISTED */)
return function render(_ctx, _cache) {
with (_ctx) {
@ -189,7 +189,7 @@ exports[`compiler: hoistStatic transform prefixIdentifiers hoist nested static t
"const _Vue = Vue
const { createVNode: _createVNode } = _Vue
const _hoisted_1 = _createVNode(\\"span\\", { foo: 0 }, _toDisplayString(1), -1 /* HOISTED */)
const _hoisted_1 = /*#__PURE__*/ _createVNode(\\"span\\", { foo: 0 }, _toDisplayString(1), -1 /* HOISTED */)
return function render(_ctx, _cache) {
with (_ctx) {
@ -346,7 +346,7 @@ exports[`compiler: hoistStatic transform should hoist v-for children if static 1
const { createVNode: _createVNode } = _Vue
const _hoisted_1 = { id: \\"foo\\" }
const _hoisted_2 = _createVNode(\\"span\\", null, null, -1 /* HOISTED */)
const _hoisted_2 = /*#__PURE__*/ _createVNode(\\"span\\", null, null, -1 /* HOISTED */)
return function render(_ctx, _cache) {
with (_ctx) {
@ -371,7 +371,7 @@ const _hoisted_1 = {
key: 0,
id: \\"foo\\"
}
const _hoisted_2 = _createVNode(\\"span\\", null, null, -1 /* HOISTED */)
const _hoisted_2 = /*#__PURE__*/ _createVNode(\\"span\\", null, null, -1 /* HOISTED */)
return function render(_ctx, _cache) {
with (_ctx) {

11
packages/compiler-core/src/codegen.ts
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@ -201,7 +201,7 @@ export function generate(
// enter render function
if (genScopeId && !ssr) {
push(`const render = _withId(`)
push(`const render = /*#__PURE__*/ _withId(`)
}
if (!ssr) {
push(`function render(_ctx, _cache) {`)
@ -400,7 +400,7 @@ function genModulePreamble(
}
if (genScopeId) {
push(`const _withId = ${helper(WITH_SCOPE_ID)}("${scopeId}")`)
push(`const _withId = /*#__PURE__*/ ${helper(WITH_SCOPE_ID)}("${scopeId}")`)
newline()
}
@ -445,6 +445,13 @@ function genHoists(hoists: JSChildNode[], context: CodegenContext) {
hoists.forEach((exp, i) => {
push(`const _hoisted_${i + 1} = `)
// make hosit function calls tree-shakable
if (
exp.type === NodeTypes.VNODE_CALL ||
exp.type === NodeTypes.JS_CALL_EXPRESSION
) {
push(`/*#__PURE__*/ `)
}
genNode(exp, context)
newline()
})

14
packages/compiler-core/src/transforms/hoistStatic.ts
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@ -45,7 +45,7 @@ function walk(
) {
for (let i = 0; i < children.length; i++) {
const child = children[i]
// only plain elements are eligible for hoisting.
// only plain elements & text calls are eligible for hoisting.
if (
child.type === NodeTypes.ELEMENT &&
child.tagType === ElementTypes.ELEMENT
@ -79,7 +79,14 @@ function walk(
}
}
}
} else if (
child.type === NodeTypes.TEXT_CALL &&
isStaticNode(child.content, resultCache)
) {
child.codegenNode = context.hoist(child.codegenNode)
}
// walk further
if (child.type === NodeTypes.ELEMENT) {
walk(child.children, context, resultCache)
} else if (child.type === NodeTypes.FOR) {
@ -91,11 +98,6 @@ function walk(
// Do not hoist v-if single child because it has to be a block
walk(branchChildren, context, resultCache, branchChildren.length === 1)
}
} else if (
child.type === NodeTypes.TEXT_CALL &&
isStaticNode(child.content, resultCache)
) {
child.codegenNode = context.hoist(child.codegenNode)
}
}
}