Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 1294x 1036x 1036x 1036x 1036x 93x 93x 93x 93x 1036x 1294x 258x 258x 258x 14x 258x 12x 12x 12x 12x 2x 2x 2x 2x 12x 257x 246x 246x 1294x 2x 2x 2x 2x 2x 2x 2x 5509x 5509x 1740x 5509x 5509x 2x 2x 2x 2x 2x 2x 2x 12787x 12787x 12787x 3146x 3146x 3146x 9641x 12787x 265x 265x 9376x 12787x 1229x 1229x 8147x 12787x 2927x 6x 6x 6x 6x 2921x 2921x 2927x 2927x 42x 2927x 2895x 2895x 26x 2704x 2x 2x 2x 24x 24x 5220x 12787x 9x 9x 5211x 5211x 12787x 12787x 3506x 12787x 1796x 1796x 3415x 3415x 3415x 2x 2x 2x 2x 2x 872x 872x 872x 21x 21x 872x 872x 21x 37x 37x 37x 37x 37x 21x 21x 872x 872x 872x 872x 8x 8x 872x 872x 161x 161x 159x 278x 278x 278x 278x 159x 161x 161x 872x 872x 1x 1x 1x 1x 1x 872x 872x 89x 89x 88x 88x 89x 89x 872x 872x 19x 36x 36x 36x 36x 36x 36x 36x 19x 19x 872x 872x 872x 2x 2x 872x 872x 872x 1x 1x 872x 872x 549x 872x 872x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 1605x 1605x 1605x 1605x 1605x 1605x 1553x 1605x 52x 52x 52x 52x 52x 52x 52x 52x 52x 52x 52x 52x 99x 99x 99x 99x 99x 52x 52x 2x 2x 2x 50x 50x 50x 50x 50x 52x 52x 52x 52x 52x 52x 52x 52x 52x 52x 52x 52x 52x 52x 21x 52x 29x 29x 52x 1553x 1605x 1553x 1553x 1605x 445x 445x 37x 445x 14x 14x 14x 12x 5x 5x 5x 5x 5x 5x 4x 4x 4x 4x 4x 4x 4x 4x 4x 12x 7x 7x 7x 7x 7x 7x 7x 4x 4x 7x 7x 7x 12x 444x 431x 431x 23x 431x 11x 11x 11x 11x 11x 11x 11x 10x 11x 9x 9x 9x 9x 9x 9x 9x 9x 9x 11x 445x 1533x 1533x 1533x 1605x 24x 24x 1509x 1509x 1509x 1605x 1503x 1605x 64x 64x 1439x 1605x 2x 2x 2x 2x 2x 2x 2x 2x 2x 1437x 1437x 1605x 1605x 1605x 1605x 1605x 1605x 1605x 1605x 1605x 297x 1605x 232x 232x 232x 1205x 1205x 1205x 1205x 1205x 1016x 334x 1016x 42x 682x 640x 640x 576x 576x 576x 576x 576x 202x 576x 576x 576x 640x 1x 1x 1x 1x 1x 1x 1x 1x 1x 63x 63x 63x 640x 640x 29x 640x 611x 611x 640x 1205x 189x 23x 23x 23x 23x 23x 23x 23x 23x 23x 55x 32x 32x 32x 32x 32x 32x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 55x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 189x 118x 54x 54x 54x 54x 54x 54x 54x 54x 54x 54x 54x 118x 64x 64x 64x 64x 64x 64x 64x 64x 64x 64x 166x 48x 48x 48x 48x 48x 48x 189x 1205x 1205x 1605x 1x 1x 1204x 1204x 1204x 2x 2x 2x 2x 2x 2x 1048x 1048x 1048x 1048x 1048x 138x 138x 138x 138x 1048x 910x 910x 1048x 1048x 102x 102x 102x 102x 102x 102x 102x 102x 946x 946x 946x 2x 2x 2x 2x 2x 2x 110x 110x 110x 110x 110x 110x 110x 110x 151x 151x 151x 129x 3x 3x 3x 129x 126x 126x 126x 126x 126x 126x 126x 1x 126x 1x 126x 125x 125x 125x 125x 6x 125x 125x 125x 125x 125x 129x 151x 110x 110x 2x 2x 2x 2x 2x 2x 2x 110x 110x 110x 110x 110x 110x 110x 102x 100x 100x 100x 110x 8x 8x 8x 8x 110x 110x 110x 110x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2037x 2037x 2037x 2037x 2037x 2037x 115x 115x 2037x 2037x 107x 107x 2037x 2037x 2037x 18x 2037x 2021x 2021x 2037x 2037x 2037x 2037x 2037x 1009x 1009x 776x 1009x 233x 233x 233x 18x 233x 11x 233x 222x 222x 233x 233x 233x 1009x 2037x 2037x 2037x 2037x 2037x 2037x 2037x 2037x 2x 2x 2x 2x 2x 2x 879x 879x 879x 879x 879x 879x 879x 879x 508x 879x 411x 411x 879x 61x 61x 61x 61x 61x 61x 61x 61x 61x 15x 61x 15x 15x 61x 453x 453x 2x 2x 2x 2x 2x 2x 2x 2x 2x 861x 692x 692x 169x 169x | import * as b from '../../../utils/builders.js';
import { extract_paths, is_simple_expression, object } from '../../../utils/ast.js';
import { error } from '../../../errors.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.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 (binding.node.name === '$$props') {
// Special case for $$props which only exists in the old world
// TODO this probably shouldn't have a 'prop' binding kind
return node;
}
if (
state.analysis.accessors ||
(state.analysis.immutable ? binding.reassigned : binding.mutated) ||
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;
}
/**
* @param {import('estree').Expression | import('estree').Pattern} expression
* @returns {boolean}
*/
function is_expression_async(expression) {
switch (expression.type) {
case 'AwaitExpression': {
return true;
}
case 'ArrayPattern': {
return expression.elements.some((element) => element && is_expression_async(element));
}
case 'ArrayExpression': {
return expression.elements.some((element) => {
if (!element) {
return false;
} else if (element.type === 'SpreadElement') {
return is_expression_async(element.argument);
} else {
return is_expression_async(element);
}
});
}
case 'AssignmentPattern':
case 'AssignmentExpression':
case 'BinaryExpression':
case 'LogicalExpression': {
return is_expression_async(expression.left) || is_expression_async(expression.right);
}
case 'CallExpression':
case 'NewExpression': {
return (
(expression.callee.type !== 'Super' && is_expression_async(expression.callee)) ||
expression.arguments.some((element) => {
if (element.type === 'SpreadElement') {
return is_expression_async(element.argument);
} else {
return is_expression_async(element);
}
})
);
}
case 'ChainExpression': {
return is_expression_async(expression.expression);
}
case 'ConditionalExpression': {
return (
is_expression_async(expression.test) ||
is_expression_async(expression.alternate) ||
is_expression_async(expression.consequent)
);
}
case 'ImportExpression': {
return is_expression_async(expression.source);
}
case 'MemberExpression': {
return (
(expression.object.type !== 'Super' && is_expression_async(expression.object)) ||
(expression.property.type !== 'PrivateIdentifier' &&
is_expression_async(expression.property))
);
}
case 'ObjectPattern':
case 'ObjectExpression': {
return expression.properties.some((property) => {
if (property.type === 'SpreadElement') {
return is_expression_async(property.argument);
} else if (property.type === 'Property') {
return (
(property.key.type !== 'PrivateIdentifier' && is_expression_async(property.key)) ||
is_expression_async(property.value)
);
}
});
}
case 'RestElement': {
return is_expression_async(expression.argument);
}
case 'SequenceExpression':
case 'TemplateLiteral': {
return expression.expressions.some((subexpression) => is_expression_async(subexpression));
}
case 'TaggedTemplateExpression': {
return is_expression_async(expression.tag) || is_expression_async(expression.quasi);
}
case 'UnaryExpression':
case 'UpdateExpression': {
return is_expression_async(expression.argument);
}
case 'YieldExpression': {
return expression.argument ? is_expression_async(expression.argument) : false;
}
default:
return false;
}
}
/**
* @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') {
error(node, 'INTERNAL', `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').Pattern[]} */
const params = [];
let added_props = false;
for (const [reference] of scope.references) {
const 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
params.push(b.id(binding.node.name.slice(1)));
params.push(b.id(binding.node.name));
} else 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'
) {
params.push(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
) {
// Handle $$props.something use-cases
if (!added_props) {
added_props = true;
params.push(b.id('$$props'));
}
} else {
// create a copy to remove start/end tags which would mess up source maps
params.push(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;
}
|