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/** @import { Binding, SvelteNode } from '#compiler' */
/** @import { ClientTransformState, ComponentClientTransformState, ComponentContext } from './types.js' */
/** @import { Scope } from '../../scope.js' */
import * as b from '../../../utils/builders.js';
import {
extract_identifiers,
extract_paths,
is_expression_async,
is_simple_expression,
object
} from '../../../utils/ast.js';
import {
PROPS_IS_LAZY_INITIAL,
PROPS_IS_IMMUTABLE,
PROPS_IS_RUNES,
PROPS_IS_UPDATED
} from '../../../../constants.js';
/**
* @template {ClientTransformState} State
* @param {AssignmentExpression} node
* @param {import('zimmerframe').Context<SvelteNode, State>} context
* @returns
*/
export function get_assignment_value(node, { state, visit }) {
if (node.left.type === 'Identifier') {
const operator = node.operator;
return operator === '='
? /** @type {Expression} */ (visit(node.right))
: // turn something like x += 1 into x = x + 1
b.binary(
/** @type {BinaryOperator} */ (operator.slice(0, -1)),
serialize_get_binding(node.left, state),
/** @type {Expression} */ (visit(node.right))
);
} else if (
node.left.type === 'MemberExpression' &&
node.left.object.type === 'ThisExpression' &&
node.left.property.type === 'PrivateIdentifier' &&
state.private_state.has(node.left.property.name)
) {
const operator = node.operator;
return operator === '='
? /** @type {Expression} */ (visit(node.right))
: // turn something like x += 1 into x = x + 1
b.binary(
/** @type {BinaryOperator} */ (operator.slice(0, -1)),
/** @type {Expression} */ (visit(node.left)),
/** @type {Expression} */ (visit(node.right))
);
} else {
return /** @type {Expression} */ (visit(node.right));
}
}
/**
* @param {Binding} binding
* @param {ClientTransformState} state
* @returns {boolean}
*/
export function is_state_source(binding, state) {
return (
(binding.kind === 'state' || binding.kind === 'frozen_state') &&
(!state.analysis.immutable || binding.reassigned || state.analysis.accessors)
);
}
/**
* @param {Identifier} node
* @param {ClientTransformState} state
* @returns {Expression}
*/
export function serialize_get_binding(node, state) {
const binding = state.scope.get(node.name);
if (binding === null || node === binding.node) {
// No associated binding or the declaration itself which shouldn't be transformed
return node;
}
if (binding.node.name === '$$props') {
// Special case for $$props which only exists in the old world
return b.id('$$sanitized_props');
}
if (binding.kind === 'store_sub') {
return b.call(node);
}
if (Object.hasOwn(state.getters, node.name)) {
const getter = state.getters[node.name];
return typeof getter === 'function' ? getter(node) : getter;
}
if (binding.kind === 'prop' || binding.kind === 'bindable_prop') {
if (is_prop_source(binding, state)) {
return b.call(node);
}
if (binding.prop_alias) {
const key = b.key(binding.prop_alias);
return b.member(b.id('$$props'), key, key.type === 'Literal');
}
return b.member(b.id('$$props'), node);
}
if (binding.kind === 'legacy_reactive_import') {
return b.call('$$_import_' + node.name);
}
if (
is_state_source(binding, state) ||
binding.kind === 'derived' ||
binding.kind === 'legacy_reactive'
) {
return b.call('$.get', node);
}
return node;
}
/**
* @template {ClientTransformState} State
* @param {AssignmentExpression} node
* @param {import('zimmerframe').Context<SvelteNode, State>} context
* @param {() => any} fallback
* @param {boolean | null} [prefix] - If the assignment is a transformed update expression, set this. Else `null`
* @param {{skip_proxy_and_freeze?: boolean}} [options]
* @returns {Expression}
*/
export function serialize_set_binding(node, context, fallback, prefix, options) {
const { state, visit } = context;
const assignee = node.left;
if (
assignee.type === 'ArrayPattern' ||
assignee.type === 'ObjectPattern' ||
assignee.type === 'RestElement'
) {
// Turn assignment into an IIFE, so that `$.set` calls etc don't produce invalid code
const tmp_id = context.state.scope.generate('tmp');
/** @type {AssignmentExpression[]} */
const original_assignments = [];
/** @type {Expression[]} */
const assignments = [];
const paths = extract_paths(assignee);
for (const path of paths) {
const value = path.expression?.(b.id(tmp_id));
const assignment = b.assignment('=', path.node, value);
original_assignments.push(assignment);
assignments.push(
serialize_set_binding(assignment, context, () => assignment, prefix, options)
);
}
if (assignments.every((assignment, i) => assignment === original_assignments[i])) {
// No change to output -> nothing to transform -> we can keep the original assignment
return fallback();
}
const rhs_expression = /** @type {Expression} */ (visit(node.right));
const iife_is_async =
is_expression_async(rhs_expression) ||
assignments.some((assignment) => is_expression_async(assignment));
const iife = b.arrow(
[],
b.block([
b.const(tmp_id, rhs_expression),
b.stmt(b.sequence(assignments)),
// return because it could be used in a nested expression where the value is needed.
// example: { foo: ({ bar } = { bar: 1 })}
b.return(b.id(tmp_id))
])
);
if (iife_is_async) {
return b.await(b.call(b.async(iife)));
} else {
return b.call(iife);
}
}
if (assignee.type !== 'Identifier' && assignee.type !== 'MemberExpression') {
throw new Error(`Unexpected assignment type ${assignee.type}`);
}
// Handle class private/public state assignment cases
if (assignee.type === 'MemberExpression') {
if (
assignee.object.type === 'ThisExpression' &&
assignee.property.type === 'PrivateIdentifier'
) {
const private_state = context.state.private_state.get(assignee.property.name);
const value = get_assignment_value(node, context);
if (private_state !== undefined) {
if (state.in_constructor) {
// See if we should wrap value in $.proxy
if (
context.state.analysis.runes &&
!options?.skip_proxy_and_freeze &&
should_proxy_or_freeze(value, context.state.scope)
) {
const assignment = fallback();
if (assignment.type === 'AssignmentExpression') {
assignment.right =
private_state.kind === 'frozen_state'
? b.call('$.freeze', value)
: serialize_proxy_reassignment(value, private_state.id, state);
return assignment;
}
}
} else {
return b.call(
'$.set',
assignee,
context.state.analysis.runes &&
!options?.skip_proxy_and_freeze &&
should_proxy_or_freeze(value, context.state.scope)
? private_state.kind === 'frozen_state'
? b.call('$.freeze', value)
: serialize_proxy_reassignment(value, private_state.id, state)
: value
);
}
}
} else if (
assignee.object.type === 'ThisExpression' &&
assignee.property.type === 'Identifier' &&
state.in_constructor
) {
const public_state = context.state.public_state.get(assignee.property.name);
const value = get_assignment_value(node, context);
// See if we should wrap value in $.proxy
if (
context.state.analysis.runes &&
public_state !== undefined &&
!options?.skip_proxy_and_freeze &&
should_proxy_or_freeze(value, context.state.scope)
) {
const assignment = fallback();
if (assignment.type === 'AssignmentExpression') {
assignment.right =
public_state.kind === 'frozen_state'
? b.call('$.freeze', value)
: serialize_proxy_reassignment(value, public_state.id, state);
return assignment;
}
}
}
}
const left = object(assignee);
if (left === null) {
return fallback();
}
const binding = state.scope.get(left.name);
if (!binding) return fallback();
if (binding.mutation !== null) {
return binding.mutation(node, context);
}
if (binding.kind === 'legacy_reactive_import') {
return b.call(
'$$_import_' + binding.node.name,
b.assignment(
node.operator,
/** @type {Pattern} */ (visit(node.left)),
/** @type {Expression} */ (visit(node.right))
)
);
}
const is_store = binding.kind === 'store_sub';
const left_name = is_store ? left.name.slice(1) : left.name;
if (
binding.kind !== 'state' &&
binding.kind !== 'frozen_state' &&
binding.kind !== 'prop' &&
binding.kind !== 'bindable_prop' &&
binding.kind !== 'each' &&
binding.kind !== 'legacy_reactive' &&
!is_store
) {
// TODO error if it's a computed (or rest prop)? or does that already happen elsewhere?
return fallback();
}
const value = get_assignment_value(node, context);
const serialize = () => {
if (left === node.left) {
const is_initial_proxy =
binding.initial !== null &&
should_proxy_or_freeze(/**@type {Expression}*/ (binding.initial), context.state.scope);
if ((binding.kind === 'prop' || binding.kind === 'bindable_prop') && !is_initial_proxy) {
return b.call(left, value);
} else if (is_store) {
return b.call('$.store_set', serialize_get_binding(b.id(left_name), state), value);
} else {
let call;
if (binding.kind === 'state') {
call = b.call(
'$.set',
b.id(left_name),
context.state.analysis.runes &&
!options?.skip_proxy_and_freeze &&
should_proxy_or_freeze(value, context.state.scope)
? serialize_proxy_reassignment(value, left_name, state)
: value
);
} else if (binding.kind === 'frozen_state') {
call = b.call(
'$.set',
b.id(left_name),
context.state.analysis.runes &&
!options?.skip_proxy_and_freeze &&
should_proxy_or_freeze(value, context.state.scope)
? b.call('$.freeze', value)
: value
);
} else if (
(binding.kind === 'prop' || binding.kind === 'bindable_prop') &&
is_initial_proxy
) {
call = b.call(
left,
context.state.analysis.runes &&
!options?.skip_proxy_and_freeze &&
should_proxy_or_freeze(value, context.state.scope) &&
binding.kind === 'bindable_prop'
? serialize_proxy_reassignment(value, left_name, state)
: value
);
} else {
call = b.call('$.set', b.id(left_name), value);
}
if (state.scope.get(`$${left.name}`)?.kind === 'store_sub') {
return b.call('$.store_unsub', call, b.literal(`$${left.name}`), b.id('$$stores'));
} else {
return call;
}
}
} else {
if (is_store) {
// If we are assigning to a store property, we need to ensure we don't
// capture the read for the store as part of the member expression to
// keep consistency with how store $ shorthand reads work in Svelte 4.
/**
*
* @param {Expression | Pattern} node
* @returns {Expression}
*/
function visit_node(node) {
if (node.type === 'MemberExpression') {
return {
...node,
object: visit_node(/** @type {Expression} */ (node.object)),
property: /** @type {MemberExpression} */ (visit(node)).property
};
}
if (node.type === 'Identifier') {
const binding = state.scope.get(node.name);
if (binding !== null && binding.kind === 'store_sub') {
return b.call('$.untrack', b.thunk(/** @type {Expression} */ (visit(node))));
}
}
return /** @type {Expression} */ (visit(node));
}
return b.call(
'$.mutate_store',
serialize_get_binding(b.id(left_name), state),
b.assignment(node.operator, /** @type {Pattern}} */ (visit_node(node.left)), value),
b.call('$.untrack', b.id('$' + left_name))
);
} else if (
!state.analysis.runes ||
// this condition can go away once legacy mode is gone; only necessary for interop with legacy parent bindings
(binding.mutated && binding.kind === 'bindable_prop')
) {
if (binding.kind === 'bindable_prop') {
return b.call(
left,
b.assignment(node.operator, /** @type {Pattern} */ (visit(node.left)), value),
b.true
);
} else {
return b.call(
'$.mutate',
b.id(left_name),
b.assignment(node.operator, /** @type {Pattern} */ (visit(node.left)), value)
);
}
} else if (
node.right.type === 'Literal' &&
prefix != null &&
(node.operator === '+=' || node.operator === '-=')
) {
return b.update(
node.operator === '+=' ? '++' : '--',
/** @type {Expression} */ (visit(node.left)),
prefix
);
} else {
return b.assignment(
node.operator,
/** @type {Pattern} */ (visit(node.left)),
/** @type {Expression} */ (visit(node.right))
);
}
}
};
if (value.type === 'BinaryExpression' && /** @type {any} */ (value.operator) === '??') {
return b.logical('??', serialize_get_binding(b.id(left_name), state), serialize());
}
return serialize();
}
/**
* @param {Expression} value
* @param {PrivateIdentifier | string} proxy_reference
* @param {ClientTransformState} state
*/
export function serialize_proxy_reassignment(value, proxy_reference, state) {
return state.options.dev
? b.call(
'$.proxy',
value,
b.null,
typeof proxy_reference === 'string'
? b.id(proxy_reference)
: b.member(b.this, proxy_reference)
)
: b.call('$.proxy', value);
}
/**
* @param {ArrowFunctionExpression | FunctionExpression} node
* @param {ComponentContext} context
*/
export const function_visitor = (node, context) => {
const metadata = node.metadata;
let state = context.state;
if (node.type === 'FunctionExpression') {
const parent = /** @type {Node} */ (context.path.at(-1));
const in_constructor = parent.type === 'MethodDefinition' && parent.kind === 'constructor';
state = { ...context.state, in_constructor };
} else {
state = { ...context.state, in_constructor: false };
}
if (metadata?.hoistable === true) {
const params = serialize_hoistable_params(node, context);
return /** @type {FunctionExpression} */ ({
...node,
params,
body: context.visit(node.body, state)
});
}
context.next(state);
};
/**
* @param {FunctionDeclaration | FunctionExpression | ArrowFunctionExpression} node
* @param {ComponentContext} context
* @returns {Pattern[]}
*/
function get_hoistable_params(node, context) {
const scope = context.state.scope;
/** @type {Identifier[]} */
const params = [];
/**
* We only want to push if it's not already present to avoid name clashing
* @param {Identifier} id
*/
function push_unique(id) {
if (!params.find((param) => param.name === id.name)) {
params.push(id);
}
}
for (const [reference] of scope.references) {
let binding = scope.get(reference);
if (binding !== null && !scope.declarations.has(reference) && binding.initial !== node) {
if (binding.kind === 'store_sub') {
// We need both the subscription for getting the value and the store for updating
push_unique(b.id(binding.node.name));
binding = /** @type {Binding} */ (scope.get(binding.node.name.slice(1)));
}
const expression = context.state.getters[reference];
if (
// If it's a destructured derived binding, then we can extract the derived signal reference and use that.
// TODO this code is bad, we need to kill it
expression != null &&
typeof expression !== 'function' &&
expression.type === 'MemberExpression' &&
expression.object.type === 'CallExpression' &&
expression.object.callee.type === 'Identifier' &&
expression.object.callee.name === '$.get' &&
expression.object.arguments[0].type === 'Identifier'
) {
push_unique(b.id(expression.object.arguments[0].name));
} else if (
// If we are referencing a simple $$props value, then we need to reference the object property instead
(binding.kind === 'prop' || binding.kind === 'bindable_prop') &&
!is_prop_source(binding, context.state)
) {
push_unique(b.id('$$props'));
} else if (
// imports don't need to be hoisted
binding.declaration_kind !== 'import'
) {
// create a copy to remove start/end tags which would mess up source maps
push_unique(b.id(binding.node.name));
// rest props are often accessed through the $$props object for optimization reasons,
// but we can't know if the delegated event handler will use it, so we need to add both as params
if (binding.kind === 'rest_prop' && context.state.analysis.runes) {
push_unique(b.id('$$props'));
}
}
}
}
return params;
}
/**
* @param {FunctionDeclaration | FunctionExpression | ArrowFunctionExpression} node
* @param {ComponentContext} context
* @returns {Pattern[]}
*/
export function serialize_hoistable_params(node, context) {
const hoistable_params = get_hoistable_params(node, context);
node.metadata.hoistable_params = hoistable_params;
/** @type {Pattern[]} */
const params = [];
if (node.params.length === 0) {
if (hoistable_params.length > 0) {
// For the event object
params.push(b.id('_'));
}
} else {
for (const param of node.params) {
params.push(/** @type {Pattern} */ (context.visit(param)));
}
}
params.push(...hoistable_params);
return params;
}
/**
* @param {Binding} binding
* @param {ComponentClientTransformState} state
* @param {string} name
* @param {Expression | null} [initial]
* @returns
*/
export function get_prop_source(binding, state, name, initial) {
/** @type {Expression[]} */
const args = [b.id('$$props'), b.literal(name)];
let flags = 0;
if (state.analysis.immutable) {
flags |= PROPS_IS_IMMUTABLE;
}
if (state.analysis.runes) {
flags |= PROPS_IS_RUNES;
}
if (
state.analysis.accessors ||
(state.analysis.immutable
? binding.reassigned || (state.analysis.runes && binding.mutated)
: binding.mutated)
) {
flags |= PROPS_IS_UPDATED;
}
/** @type {Expression | undefined} */
let arg;
if (initial) {
// To avoid eagerly evaluating the right-hand-side, we wrap it in a thunk if necessary
if (is_simple_expression(initial)) {
arg = initial;
} else {
if (
initial.type === 'CallExpression' &&
initial.callee.type === 'Identifier' &&
initial.arguments.length === 0
) {
arg = initial.callee;
} else {
arg = b.thunk(initial);
}
flags |= PROPS_IS_LAZY_INITIAL;
}
}
if (flags || arg) {
args.push(b.literal(flags));
if (arg) args.push(arg);
}
return b.call('$.prop', ...args);
}
/**
*
* @param {Binding} binding
* @param {ClientTransformState} state
* @returns
*/
export function is_prop_source(binding, state) {
return (
(binding.kind === 'prop' || binding.kind === 'bindable_prop') &&
(!state.analysis.runes ||
state.analysis.accessors ||
binding.reassigned ||
binding.initial ||
// Until legacy mode is gone, we also need to use the prop source when only mutated is true,
// because the parent could be a legacy component which needs coarse-grained reactivity
binding.mutated)
);
}
/**
* @param {Expression} node
* @param {Scope | null} scope
*/
export function should_proxy_or_freeze(node, scope) {
if (
!node ||
node.type === 'Literal' ||
node.type === 'TemplateLiteral' ||
node.type === 'ArrowFunctionExpression' ||
node.type === 'FunctionExpression' ||
node.type === 'UnaryExpression' ||
node.type === 'BinaryExpression' ||
(node.type === 'Identifier' && node.name === 'undefined')
) {
return false;
}
if (node.type === 'Identifier' && scope !== null) {
const binding = scope.get(node.name);
// Let's see if the reference is something that can be proxied or frozen
if (
binding !== null &&
!binding.reassigned &&
binding.initial !== null &&
binding.initial.type !== 'FunctionDeclaration' &&
binding.initial.type !== 'ClassDeclaration' &&
binding.initial.type !== 'ImportDeclaration' &&
binding.initial.type !== 'EachBlock'
) {
return should_proxy_or_freeze(binding.initial, null);
}
}
return true;
}
/**
* Port over the location information from the source to the target identifier.
* but keep the target as-is (i.e. a new id is created).
* This ensures esrap can generate accurate source maps.
* @param {Identifier} target
* @param {Identifier} source
*/
export function with_loc(target, source) {
if (source.loc) {
return { ...target, loc: source.loc };
}
return target;
}
/**
* @param {Pattern} node
* @param {import('zimmerframe').Context<SvelteNode, ComponentClientTransformState>} context
* @returns {{ id: Pattern, declarations: null | Statement[] }}
*/
export function create_derived_block_argument(node, context) {
if (node.type === 'Identifier') {
return { id: node, declarations: null };
}
const pattern = /** @type {Pattern} */ (context.visit(node));
const identifiers = extract_identifiers(node);
const id = b.id('$$source');
const value = b.id('$$value');
const block = b.block([
b.var(pattern, b.call('$.get', id)),
b.return(b.object(identifiers.map((identifier) => b.prop('init', identifier, identifier))))
]);
const declarations = [b.var(value, create_derived(context.state, b.thunk(block)))];
for (const id of identifiers) {
declarations.push(
b.var(id, create_derived(context.state, b.thunk(b.member(b.call('$.get', value), id))))
);
}
return { id, declarations };
}
/**
* Svelte legacy mode should use safe equals in most places, runes mode shouldn't
* @param {ComponentClientTransformState} state
* @param {Expression} arg
*/
export function create_derived(state, arg) {
return b.call(state.analysis.runes ? '$.derived' : '$.derived_safe_equal', arg);
}
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