Press n or j to go to the next uncovered block, b, p or k for the previous block.
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226x 1002x 1988x 1988x 1969x 1969x 1969x 1988x 1988x 1988x 2x 2x 2x 2x 2x 2x 678x 678x 678x 678x 678x 678x 678x 678x 301x 678x 421x 421x 678x 55x 55x 55x 55x 55x 55x 55x 55x 55x 7x 55x 7x 7x 55x 250x 250x 2x 2x 2x 2x 2x 2x 2x 2x 2x 871x 700x 700x 171x 171x | import * as b from '../../../utils/builders.js';
import {
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 {import('./types').ClientTransformState} State
* @param {import('estree').AssignmentExpression} node
* @param {import('zimmerframe').Context<import('#compiler').SvelteNode, State>} context
* @returns
*/
export function get_assignment_value(node, { state, visit }) {
if (node.left.type === 'Identifier') {
const operator = node.operator;
return operator === '='
? /** @type {import('estree').Expression} */ (visit(node.right))
: // turn something like x += 1 into x = x + 1
b.binary(
/** @type {import('estree').BinaryOperator} */ (operator.slice(0, -1)),
serialize_get_binding(node.left, state),
/** @type {import('estree').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 {import('estree').Expression} */ (visit(node.right))
: // turn something like x += 1 into x = x + 1
b.binary(
/** @type {import('estree').BinaryOperator} */ (operator.slice(0, -1)),
/** @type {import('estree').Expression} */ (visit(node.left)),
/** @type {import('estree').Expression} */ (visit(node.right))
);
} else {
return /** @type {import('estree').Expression} */ (visit(node.right));
}
}
/**
* @param {import('#compiler').Binding} binding
* @param {import('./types').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 {import('estree').Identifier} node
* @param {import('./types').ClientTransformState} state
* @returns {import('estree').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('$$sanitized_props');
}
if (binding.kind === 'store_sub') {
return b.call(node);
}
if (binding.expression) {
return typeof binding.expression === 'function' ? binding.expression(node) : binding.expression;
}
if (binding.kind === 'prop' || binding.kind === 'bindable_prop') {
if (!state.analysis.runes || binding.reassigned || binding.initial) {
return b.call(node);
}
if (binding.prop_alias) {
const key = b.key(binding.prop_alias);
return b.member(b.id('$$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('$.get', node);
}
return node;
}
/**
* @template {import('./types').ClientTransformState} State
* @param {import('estree').AssignmentExpression} node
* @param {import('zimmerframe').Context<import('#compiler').SvelteNode, State>} context
* @param {() => any} fallback
* @param {{skip_proxy_and_freeze?: boolean}} [options]
* @returns {import('estree').Expression}
*/
export function serialize_set_binding(node, context, fallback, options) {
const { state, visit } = context;
const assignee = node.left;
if (
assignee.type === 'ArrayPattern' ||
assignee.type === 'ObjectPattern' ||
assignee.type === 'RestElement'
) {
// Turn assignment into an IIFE, so that `$.set` calls etc don't produce invalid code
const tmp_id = context.state.scope.generate('tmp');
/** @type {import('estree').AssignmentExpression[]} */
const original_assignments = [];
/** @type {import('estree').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, 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 {import('estree').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)
: b.call('$.proxy', value);
return assignment;
}
}
} else {
return b.call(
'$.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('$.freeze', value)
: b.call('$.proxy', value)
: 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)
: b.call('$.proxy', value);
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(
'$$_import_' + binding.node.name,
b.assignment(
node.operator,
/** @type {import('estree').Pattern} */ (visit(node.left)),
/** @type {import('estree').Expression} */ (visit(node.right))
)
);
}
const is_store = binding.kind === 'store_sub';
const left_name = is_store ? left.name.slice(1) : left.name;
if (
binding.kind !== 'state' &&
binding.kind !== 'frozen_state' &&
binding.kind !== 'prop' &&
binding.kind !== 'bindable_prop' &&
binding.kind !== 'each' &&
binding.kind !== 'legacy_reactive' &&
!is_store
) {
// TODO error if it's a computed (or rest prop)? or does that already happen elsewhere?
return fallback();
}
const value = get_assignment_value(node, context);
const serialize = () => {
if (left === node.left) {
if (binding.kind === 'prop' || binding.kind === 'bindable_prop') {
return b.call(left, value);
} else if (is_store) {
return b.call('$.store_set', serialize_get_binding(b.id(left_name), state), value);
} else {
let call;
if (binding.kind === 'state') {
call = b.call(
'$.set',
b.id(left_name),
context.state.analysis.runes &&
!options?.skip_proxy_and_freeze &&
should_proxy_or_freeze(value, context.state.scope)
? b.call('$.proxy', value)
: value
);
} else if (binding.kind === 'frozen_state') {
call = b.call(
'$.set',
b.id(left_name),
context.state.analysis.runes &&
!options?.skip_proxy_and_freeze &&
should_proxy_or_freeze(value, context.state.scope)
? b.call('$.freeze', value)
: value
);
} else {
call = b.call('$.set', b.id(left_name), value);
}
if (state.scope.get(`$${left.name}`)?.kind === 'store_sub') {
return b.call('$.store_unsub', call, b.literal(`$${left.name}`), b.id('$$subscriptions'));
} 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 {import("estree").Expression | import("estree").Pattern} node
* @returns {import("estree").Expression}
*/
function visit_node(node) {
if (node.type === 'MemberExpression') {
return {
...node,
object: visit_node(/** @type {import("estree").Expression} */ (node.object)),
property: /** @type {import("estree").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(
'$.untrack',
b.thunk(/** @type {import('estree').Expression} */ (visit(node)))
);
}
}
return /** @type {import("estree").Expression} */ (visit(node));
}
return b.call(
'$.mutate_store',
serialize_get_binding(b.id(left_name), state),
b.assignment(
node.operator,
/** @type {import("estree").Pattern}} */ (visit_node(node.left)),
value
),
b.call('$.untrack', b.id('$' + left_name))
);
} else if (!state.analysis.runes) {
if (binding.kind === 'bindable_prop') {
return b.call(
left,
b.sequence([
b.assignment(
node.operator,
/** @type {import('estree').Pattern} */ (visit(node.left)),
value
),
b.call(left)
])
);
} else {
return b.call(
'$.mutate',
b.id(left_name),
b.assignment(
node.operator,
/** @type {import('estree').Pattern} */ (visit(node.left)),
value
)
);
}
} else {
return b.assignment(
node.operator,
/** @type {import('estree').Pattern} */ (visit(node.left)),
/** @type {import('estree').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 {import('estree').ArrowFunctionExpression | import('estree').FunctionExpression} node
* @param {import('./types').ComponentContext} context
*/
export const function_visitor = (node, context) => {
const metadata = node.metadata;
let state = context.state;
if (node.type === 'FunctionExpression') {
const parent = /** @type {import('estree').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 {import('estree').FunctionExpression} */ ({
...node,
params,
body: context.visit(node.body, state)
});
}
context.next(state);
};
/**
* @param {import('estree').FunctionDeclaration | import('estree').FunctionExpression | import('estree').ArrowFunctionExpression} node
* @param {import('./types').ComponentContext} context
* @returns {import('estree').Pattern[]}
*/
function get_hoistable_params(node, context) {
const scope = context.state.scope;
/** @type {import('estree').Identifier[]} */
const params = [];
/**
* We only want to push if it's not already present to avoid name clashing
* @param {import('estree').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 {import('#compiler').Binding} */ (
scope.get(binding.node.name.slice(1))
);
}
if (
// If it's a destructured derived binding, then we can extract the derived signal reference and use that.
binding.expression !== null &&
typeof binding.expression !== 'function' &&
binding.expression.type === 'MemberExpression' &&
binding.expression.object.type === 'CallExpression' &&
binding.expression.object.callee.type === 'Identifier' &&
binding.expression.object.callee.name === '$.get' &&
binding.expression.object.arguments[0].type === 'Identifier'
) {
push_unique(b.id(binding.expression.object.arguments[0].name));
} else if (
// If we are referencing a simple $$props value, then we need to reference the object property instead
(binding.kind === 'prop' || binding.kind === 'bindable_prop') &&
!binding.reassigned &&
binding.initial === null &&
!context.state.analysis.accessors
) {
push_unique(b.id('$$props'));
} else {
// create a copy to remove start/end tags which would mess up source maps
push_unique(b.id(binding.node.name));
}
}
}
return params;
}
/**
* @param {import('estree').FunctionDeclaration | import('estree').FunctionExpression | import('estree').ArrowFunctionExpression} node
* @param {import('./types').ComponentContext} context
* @returns {import('estree').Pattern[]}
*/
export function serialize_hoistable_params(node, context) {
const hoistable_params = get_hoistable_params(node, context);
node.metadata.hoistable_params = hoistable_params;
/** @type {import('estree').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 {import('estree').Pattern} */ (context.visit(param)));
}
}
params.push(...hoistable_params);
return params;
}
/**
* @param {import('#compiler').Binding} binding
* @param {import('./types').ComponentClientTransformState} state
* @param {string} name
* @param {import('estree').Expression | null} [initial]
* @returns
*/
export function get_prop_source(binding, state, name, initial) {
/** @type {import('estree').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 : binding.mutated)
) {
flags |= PROPS_IS_UPDATED;
}
/** @type {import('estree').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 {import('estree').Expression} node
* @param {import("../../scope.js").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 {import('estree').Identifier} target
* @param {import('estree').Identifier} source
*/
export function with_loc(target, source) {
if (source.loc) {
return { ...target, loc: source.loc };
}
return target;
}
|