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/** @import { SvelteNode, ValidatedCompileOptions, ValidatedModuleCompileOptions } from '#compiler' */
/** @import { ComponentServerTransformState, ComponentVisitors, ServerTransformState, Visitors } from './types.js' */
/** @import { Analysis, ComponentAnalysis } from '../../types.js' */
import { walk } from 'zimmerframe';
import { set_scope } from '../../scope.js';
import { extract_identifiers } from '../../../utils/ast.js';
import * as b from '../../../utils/builders.js';
import { dev, filename } from '../../../state.js';
import { render_stylesheet } from '../css/index.js';
import { AssignmentExpression } from './visitors/AssignmentExpression.js';
import { AwaitBlock } from './visitors/AwaitBlock.js';
import { CallExpression } from './visitors/CallExpression.js';
import { ClassBody } from './visitors/ClassBody.js';
import { Component } from './visitors/Component.js';
import { ConstTag } from './visitors/ConstTag.js';
import { DebugTag } from './visitors/DebugTag.js';
import { EachBlock } from './visitors/EachBlock.js';
import { ExpressionStatement } from './visitors/ExpressionStatement.js';
import { Fragment } from './visitors/Fragment.js';
import { HtmlTag } from './visitors/HtmlTag.js';
import { Identifier } from './visitors/Identifier.js';
import { IfBlock } from './visitors/IfBlock.js';
import { KeyBlock } from './visitors/KeyBlock.js';
import { LabeledStatement } from './visitors/LabeledStatement.js';
import { MemberExpression } from './visitors/MemberExpression.js';
import { PropertyDefinition } from './visitors/PropertyDefinition.js';
import { RegularElement } from './visitors/RegularElement.js';
import { RenderTag } from './visitors/RenderTag.js';
import { SlotElement } from './visitors/SlotElement.js';
import { SnippetBlock } from './visitors/SnippetBlock.js';
import { SpreadAttribute } from './visitors/SpreadAttribute.js';
import { SvelteComponent } from './visitors/SvelteComponent.js';
import { SvelteElement } from './visitors/SvelteElement.js';
import { SvelteFragment } from './visitors/SvelteFragment.js';
import { SvelteHead } from './visitors/SvelteHead.js';
import { SvelteSelf } from './visitors/SvelteSelf.js';
import { TitleElement } from './visitors/TitleElement.js';
import { UpdateExpression } from './visitors/UpdateExpression.js';
import { VariableDeclaration } from './visitors/VariableDeclaration.js';
/** @type {Visitors} */
const global_visitors = {
_: set_scope,
AssignmentExpression,
CallExpression,
ClassBody,
ExpressionStatement,
Identifier,
LabeledStatement,
MemberExpression,
PropertyDefinition,
UpdateExpression,
VariableDeclaration
};
/** @type {ComponentVisitors} */
const template_visitors = {
AwaitBlock,
Component,
ConstTag,
DebugTag,
EachBlock,
Fragment,
HtmlTag,
IfBlock,
KeyBlock,
RegularElement,
RenderTag,
SlotElement,
SnippetBlock,
SpreadAttribute,
SvelteComponent,
SvelteElement,
SvelteFragment,
SvelteHead,
SvelteSelf,
TitleElement
};
/**
* @param {ComponentAnalysis} analysis
* @param {ValidatedCompileOptions} options
* @returns {Program}
*/
export function server_component(analysis, options) {
/** @type {ComponentServerTransformState} */
const state = {
analysis,
options,
scope: analysis.module.scope,
scopes: analysis.module.scopes,
hoisted: [b.import_all('$', 'svelte/internal/server')],
legacy_reactive_statements: new Map(),
// these are set inside the `Fragment` visitor, and cannot be used until then
init: /** @type {any} */ (null),
template: /** @type {any} */ (null),
namespace: options.namespace,
preserve_whitespace: options.preserveWhitespace,
private_derived: new Map(),
skip_hydration_boundaries: false
};
const module = /** @type {Program} */ (
walk(/** @type {SvelteNode} */ (analysis.module.ast), state, global_visitors)
);
const instance = /** @type {Program} */ (
walk(
/** @type {SvelteNode} */ (analysis.instance.ast),
{ ...state, scopes: analysis.instance.scopes },
{
...global_visitors,
ImportDeclaration(node) {
state.hoisted.push(node);
return b.empty;
},
ExportNamedDeclaration(node, context) {
if (node.declaration) {
return context.visit(node.declaration);
}
return b.empty;
}
}
)
);
const template = /** @type {Program} */ (
walk(
/** @type {SvelteNode} */ (analysis.template.ast),
{ ...state, scopes: analysis.template.scopes },
// @ts-expect-error don't know, don't care
{ ...global_visitors, ...template_visitors }
)
);
/** @type {VariableDeclarator[]} */
const legacy_reactive_declarations = [];
for (const [node] of analysis.reactive_statements) {
const statement = [...state.legacy_reactive_statements].find(([n]) => n === node);
if (statement === undefined) {
throw new Error('Could not find reactive statement');
}
if (
node.body.type === 'ExpressionStatement' &&
node.body.expression.type === 'AssignmentExpression'
) {
for (const id of extract_identifiers(node.body.expression.left)) {
const binding = analysis.instance.scope.get(id.name);
if (binding?.kind === 'legacy_reactive') {
legacy_reactive_declarations.push(b.declarator(id));
}
}
}
instance.body.push(statement[1]);
}
if (legacy_reactive_declarations.length > 0) {
instance.body.unshift({
type: 'VariableDeclaration',
kind: 'let',
declarations: legacy_reactive_declarations
});
}
// If the component binds to a child, we need to put the template in a loop and repeat until legacy bindings are stable.
// We can remove this once the legacy syntax is gone.
if (analysis.uses_component_bindings) {
const snippets = template.body.filter(
// @ts-expect-error
(node) => node.type === 'FunctionDeclaration' && node.___snippet
);
const rest = template.body.filter(
// @ts-expect-error
(node) => node.type !== 'FunctionDeclaration' || !node.___snippet
);
template.body = [
...snippets,
b.let('$$settled', b.true),
b.let('$$inner_payload'),
b.stmt(
b.function(
b.id('$$render_inner'),
[b.id('$$payload')],
b.block(/** @type {Statement[]} */ (rest))
)
),
b.do_while(
b.unary('!', b.id('$$settled')),
b.block([
b.stmt(b.assignment('=', b.id('$$settled'), b.true)),
b.stmt(
b.assignment('=', b.id('$$inner_payload'), b.call('$.copy_payload', b.id('$$payload')))
),
b.stmt(b.call('$$render_inner', b.id('$$inner_payload')))
])
),
b.stmt(b.call('$.assign_payload', b.id('$$payload'), b.id('$$inner_payload')))
];
}
if (
[...analysis.instance.scope.declarations.values()].some(
(binding) => binding.kind === 'store_sub'
)
) {
instance.body.unshift(b.var('$$store_subs'));
template.body.push(
b.if(b.id('$$store_subs'), b.stmt(b.call('$.unsubscribe_stores', b.id('$$store_subs'))))
);
}
// Propagate values of bound props upwards if they're undefined in the parent and have a value.
// Don't do this as part of the props retrieval because people could eagerly mutate the prop in the instance script.
/** @type {Property[]} */
const props = [];
for (const [name, binding] of analysis.instance.scope.declarations) {
if (binding.kind === 'bindable_prop' && !name.startsWith('$$')) {
props.push(b.init(binding.prop_alias ?? name, b.id(name)));
}
}
for (const { name, alias } of analysis.exports) {
props.push(b.init(alias ?? name, b.id(name)));
}
if (props.length > 0) {
// This has no effect in runes mode other than throwing an error when someone passes
// undefined to a binding that has a default value.
template.body.push(b.stmt(b.call('$.bind_props', b.id('$$props'), b.object(props))));
}
const component_block = b.block([
.../** @type {Statement[]} */ (instance.body),
.../** @type {Statement[]} */ (template.body)
]);
let should_inject_context = dev || analysis.needs_context;
if (should_inject_context) {
component_block.body.unshift(b.stmt(b.call('$.push', dev && b.id(analysis.name))));
component_block.body.push(b.stmt(b.call('$.pop')));
}
if (analysis.uses_rest_props) {
/** @type {string[]} */
const named_props = analysis.exports.map(({ name, alias }) => alias ?? name);
for (const [name, binding] of analysis.instance.scope.declarations) {
if (binding.kind === 'bindable_prop') named_props.push(binding.prop_alias ?? name);
}
component_block.body.unshift(
b.const(
'$$restProps',
b.call(
'$.rest_props',
b.id('$$sanitized_props'),
b.array(named_props.map((name) => b.literal(name)))
)
)
);
}
if (analysis.uses_props || analysis.uses_rest_props) {
component_block.body.unshift(
b.const('$$sanitized_props', b.call('$.sanitize_props', b.id('$$props')))
);
}
if (analysis.uses_slots) {
component_block.body.unshift(b.const('$$slots', b.call('$.sanitize_slots', b.id('$$props'))));
}
const body = [...state.hoisted, ...module.body];
if (analysis.css.ast !== null && options.css === 'injected' && !options.customElement) {
const hash = b.literal(analysis.css.hash);
const code = b.literal(render_stylesheet(analysis.source, analysis, options).code);
body.push(b.const('$$css', b.object([b.init('hash', hash), b.init('code', code)])));
component_block.body.unshift(b.stmt(b.call('$$payload.css.add', b.id('$$css'))));
}
let should_inject_props =
should_inject_context ||
props.length > 0 ||
analysis.needs_props ||
analysis.uses_props ||
analysis.uses_rest_props ||
analysis.uses_slots ||
analysis.slot_names.size > 0;
const component_function = b.function_declaration(
b.id(analysis.name),
should_inject_props ? [b.id('$$payload'), b.id('$$props')] : [b.id('$$payload')],
component_block
);
if (options.compatibility.componentApi === 4) {
body.unshift(b.imports([['render', '$$_render']], 'svelte/server'));
body.push(
component_function,
b.stmt(
b.assignment(
'=',
b.member_id(`${analysis.name}.render`),
b.function(
null,
[b.id('$$props'), b.id('$$opts')],
b.block([
b.return(
b.call(
'$$_render',
b.id(analysis.name),
b.object([
b.init('props', b.id('$$props')),
b.init('context', b.member(b.id('$$opts'), 'context', false, true))
])
)
)
])
)
)
),
b.export_default(b.id(analysis.name))
);
} else if (dev) {
body.push(
component_function,
b.stmt(
b.assignment(
'=',
b.member_id(`${analysis.name}.render`),
b.function(
null,
[],
b.block([
b.throw_error(
`Component.render(...) is no longer valid in Svelte 5. ` +
'See https://svelte-5-preview.vercel.app/docs/breaking-changes#components-are-no-longer-classes for more information'
)
])
)
)
),
b.export_default(b.id(analysis.name))
);
} else {
body.push(b.export_default(component_function));
}
if (dev) {
// add `App[$.FILENAME] = 'App.svelte'` so that we can print useful messages later
body.unshift(
b.stmt(
b.assignment('=', b.member(b.id(analysis.name), '$.FILENAME', true), b.literal(filename))
)
);
}
return {
type: 'Program',
sourceType: 'module',
body
};
}
/**
* @param {Analysis} analysis
* @param {ValidatedModuleCompileOptions} options
* @returns {Program}
*/
export function server_module(analysis, options) {
/** @type {ServerTransformState} */
const state = {
analysis,
options,
scope: analysis.module.scope,
scopes: analysis.module.scopes,
// this is an anomaly — it can only be used in components, but it needs
// to be present for `javascript_visitors_legacy` and so is included in module
// transform state as well as component transform state
legacy_reactive_statements: new Map(),
private_derived: new Map()
};
const module = /** @type {Program} */ (
walk(/** @type {SvelteNode} */ (analysis.module.ast), state, global_visitors)
);
return {
type: 'Program',
sourceType: 'module',
body: [b.import_all('$', 'svelte/internal/server'), ...module.body]
};
}
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