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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 210059x 210059x 210059x 210059x 210059x 210059x 19711x 19711x 19711x 23683x 23683x 23683x 260x 260x 260x 260x 260x 260x 260x 23683x 7195x 7195x 23683x 210059x 190348x 190348x 190348x 196x 221x 221x 221x 221x 221x 221x 221x 221x 196x 190348x 210059x 210059x 87x 87x 210059x 210059x 210059x 210059x 210059x 210059x 210059x 87x 87x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 10826x 10826x 10826x 6331x 6331x 6331x 6331x 6331x 10826x 10826x 10826x 10826x 10826x 10826x 2x 2x 2x 2x 5395x 5395x 5395x 5395x 5395x 5395x 32x 32x 5395x 5395x 2x 2x 2x 2x 2x 2x 2x 2x 2x 43x 43x 43x 111x 111x 1x 1x 42x 42x 42x 111x 1x 1x 111x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 41x 2x 2x 2x 2x 2x 2x 2x 2x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 4703x 4703x 5x 5x 1691x 1691x 1691x 1691x 1691x 1691x 1691x 3515x 4703x 1388x 49x 49x 38x 1388x 14x 14x 14x 14x 2x 1388x 4703x 315x 315x 565x 1866x 1866x 1866x 1866x 1866x 565x 565x 5x 5x 5x 560x 560x 1866x 560x 315x 315x 5x 5x 310x 310x 73x 1x 73x 12x 19x 13x 13x 19x 12x 73x 309x 309x 309x 558x 558x 558x 558x 4x 4x 558x 1x 1x 558x 308x 308x 308x 308x 308x 308x 308x 4703x 5395x 5395x 5395x 5413x 5413x 5413x 36x 36x 1x 1x 36x 5395x 5395x 5395x 5395x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 2110x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 425x 425x 425x 425x 425x 5413x 5413x 5413x 5413x 5413x 5413x 5413x 4115x 4115x 7956x 3760x 3760x 3760x 7703x 3724x 3724x 3575x 3724x 149x 149x 149x 149x 3724x 3575x 68x 68x 84x 84x 68x 3575x 3507x 4003x 4051x 4051x 4051x 4003x 3507x 3575x 7936x 36x 66x 66x 66x 66x 66x 66x 47x 47x 47x 23x 23x 66x 19x 19x 66x 36x 7956x 4115x 4115x 4115x 4115x 7153x 2660x 7153x 6721x 4071x 6711x 2026x 2026x 2026x 913x 2026x 1302x 1302x 2026x 6721x 2660x 4115x 4115x 4115x 4115x 4115x 724x 724x 724x 1020x 108x 108x 108x 108x 108x 108x 134x 134x 134x 118x 118x 118x 30x 30x 30x 118x 134x 108x 108x 108x 108x 1020x 724x 4115x 4115x 5395x 5413x 61x 62x 62x 62x 2x 2x 62x 62x 62x 61x 5395x 5413x 1280x 1280x 1280x 1280x 1280x 1280x 1280x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 3810x 1241x 1241x 1280x 2482x 2981x 61x 180x 180x 169x 169x 169x 169x 169x 169x 23x 23x 146x 146x 169x 29x 169x 27x 61x 61x 61x 61x 61x 58x 61x 3x 3x 3x 61x 24x 24x 169x 9x 9x 9x 9x 49x 2981x 2482x 5413x 4115x 4115x 4115x 4115x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 12334x 4013x 4115x 15106x 15106x 4092x 15106x 4092x 4092x 4092x 4092x 74x 74x 4092x 15106x 4013x 4013x 4013x 5253x 5413x 1x 1x 1x 1x 1x 5252x 5252x 5413x 127x 5413x 1x 1x 1x 5251x 5413x 425x 425x 425x 425x 986x 986x 400x 400x 400x 417x 1x 1x 425x 425x 425x 399x 399x 400x 417x 986x 980x 986x 814x 814x 814x 808x 808x 808x 808x 814x 557x 12x 12x 12x 545x 557x 557x 451x 451x 451x 796x 814x 449x 409x 449x 40x 40x 40x 40x 40x 40x 40x 40x 40x 40x 40x 16x 26x 24x 24x 40x 814x 347x 347x 347x 347x 347x 347x 347x 347x 347x 347x 347x 347x 347x 4x 4x 347x 814x 986x 400x 5226x 5226x 5226x 5226x 5226x 5226x 2x 2x 2x 2x 4013x 4013x 4013x 4013x 4013x 4013x 4013x 338x 280x 280x 280x 280x 338x 4013x 4013x 4013x 4013x 4013x 338x 280x 419x 352x 352x 419x 280x 338x 4013x 4013x 4013x 1x 1x 1x 4012x 4012x 4012x 4012x 4012x 4012x 4012x 4012x 4012x 4012x 4012x 4012x 375x 336x 372x 495x 495x 39x 39x 439x 336x 336x 4012x 4012x 4013x 336x 336x 4012x 4012x 4012x | /** @import { Expression, Node, Program } from 'estree' */
/** @import { Binding, AST, SvelteNode, ValidatedCompileOptions, ValidatedModuleCompileOptions } from '#compiler' */
/** @import { AnalysisState, Visitors } from './types' */
/** @import { Analysis, ComponentAnalysis, Js, ReactiveStatement, Template } from '../types' */
import { walk } from 'zimmerframe';
import * as e from '../../errors.js';
import * as w from '../../warnings.js';
import { extract_identifiers, is_text_attribute } from '../../utils/ast.js';
import * as b from '../../utils/builders.js';
import { Scope, ScopeRoot, create_scopes, get_rune, set_scope } from '../scope.js';
import check_graph_for_cycles from './utils/check_graph_for_cycles.js';
import { create_attribute, is_custom_element_node } from '../nodes.js';
import { analyze_css } from './css/css-analyze.js';
import { prune } from './css/css-prune.js';
import { hash, is_rune } from '../../../utils.js';
import { warn_unused } from './css/css-warn.js';
import { extract_svelte_ignore } from '../../utils/extract_svelte_ignore.js';
import { ignore_map, ignore_stack, pop_ignore, push_ignore } from '../../state.js';
import { ArrowFunctionExpression } from './visitors/ArrowFunctionExpression.js';
import { AssignmentExpression } from './visitors/AssignmentExpression.js';
import { Attribute } from './visitors/Attribute.js';
import { AwaitBlock } from './visitors/AwaitBlock.js';
import { BindDirective } from './visitors/BindDirective.js';
import { CallExpression } from './visitors/CallExpression.js';
import { ClassBody } from './visitors/ClassBody.js';
import { ClassDeclaration } from './visitors/ClassDeclaration.js';
import { ClassDirective } from './visitors/ClassDirective.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 { ExportDefaultDeclaration } from './visitors/ExportDefaultDeclaration.js';
import { ExportNamedDeclaration } from './visitors/ExportNamedDeclaration.js';
import { ExportSpecifier } from './visitors/ExportSpecifier.js';
import { ExpressionStatement } from './visitors/ExpressionStatement.js';
import { ExpressionTag } from './visitors/ExpressionTag.js';
import { FunctionDeclaration } from './visitors/FunctionDeclaration.js';
import { FunctionExpression } from './visitors/FunctionExpression.js';
import { HtmlTag } from './visitors/HtmlTag.js';
import { Identifier } from './visitors/Identifier.js';
import { IfBlock } from './visitors/IfBlock.js';
import { ImportDeclaration } from './visitors/ImportDeclaration.js';
import { KeyBlock } from './visitors/KeyBlock.js';
import { LabeledStatement } from './visitors/LabeledStatement.js';
import { LetDirective } from './visitors/LetDirective.js';
import { MemberExpression } from './visitors/MemberExpression.js';
import { NewExpression } from './visitors/NewExpression.js';
import { OnDirective } from './visitors/OnDirective.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 { StyleDirective } from './visitors/StyleDirective.js';
import { SvelteBody } from './visitors/SvelteBody.js';
import { SvelteComponent } from './visitors/SvelteComponent.js';
import { SvelteDocument } from './visitors/SvelteDocument.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 { SvelteWindow } from './visitors/SvelteWindow.js';
import { TaggedTemplateExpression } from './visitors/TaggedTemplateExpression.js';
import { Text } from './visitors/Text.js';
import { TitleElement } from './visitors/TitleElement.js';
import { UpdateExpression } from './visitors/UpdateExpression.js';
import { UseDirective } from './visitors/UseDirective.js';
import { VariableDeclarator } from './visitors/VariableDeclarator.js';
import is_reference from 'is-reference';
import { mark_subtree_dynamic } from './visitors/shared/fragment.js';
/**
* @type {Visitors}
*/
const visitors = {
_(node, { state, next, path }) {
const parent = path.at(-1);
/** @type {string[]} */
const ignores = [];
if (parent?.type === 'Fragment' && node.type !== 'Comment' && node.type !== 'Text') {
const idx = parent.nodes.indexOf(/** @type {any} */ (node));
for (let i = idx - 1; i >= 0; i--) {
const prev = parent.nodes[i];
if (prev.type === 'Comment') {
ignores.push(
...extract_svelte_ignore(
prev.start + 4 /* '<!--'.length */,
prev.data,
state.analysis.runes
)
);
} else if (prev.type !== 'Text') {
break;
}
}
} else {
const comments = /** @type {any} */ (node).leadingComments;
if (comments) {
for (const comment of comments) {
ignores.push(
...extract_svelte_ignore(
comment.start + 2 /* '//'.length */,
comment.value,
state.analysis.runes
)
);
}
}
}
if (ignores.length > 0) {
push_ignore(ignores);
}
ignore_map.set(node, structuredClone(ignore_stack));
const scope = state.scopes.get(node);
next(scope !== undefined && scope !== state.scope ? { ...state, scope } : state);
if (ignores.length > 0) {
pop_ignore();
}
},
ArrowFunctionExpression,
AssignmentExpression,
Attribute,
AwaitBlock,
BindDirective,
CallExpression,
ClassBody,
ClassDeclaration,
ClassDirective,
Component,
ConstTag,
DebugTag,
EachBlock,
ExportDefaultDeclaration,
ExportNamedDeclaration,
ExportSpecifier,
ExpressionStatement,
ExpressionTag,
FunctionDeclaration,
FunctionExpression,
HtmlTag,
Identifier,
IfBlock,
ImportDeclaration,
KeyBlock,
LabeledStatement,
LetDirective,
MemberExpression,
NewExpression,
OnDirective,
RegularElement,
RenderTag,
SlotElement,
SnippetBlock,
SpreadAttribute,
StyleDirective,
SvelteBody,
SvelteComponent,
SvelteDocument,
SvelteElement,
SvelteFragment,
SvelteHead,
SvelteSelf,
SvelteWindow,
TaggedTemplateExpression,
Text,
TitleElement,
UpdateExpression,
UseDirective,
VariableDeclarator
};
/**
* @param {AST.Script | null} script
* @param {ScopeRoot} root
* @param {boolean} allow_reactive_declarations
* @param {Scope | null} parent
* @returns {Js}
*/
function js(script, root, allow_reactive_declarations, parent) {
/** @type {Program} */
const ast = script?.content ?? {
type: 'Program',
sourceType: 'module',
start: -1,
end: -1,
body: []
};
const { scope, scopes } = create_scopes(ast, root, allow_reactive_declarations, parent);
return { ast, scope, scopes };
}
/**
* @param {string} filename
*/
function get_component_name(filename) {
const parts = filename.split(/[/\\]/);
const basename = /** @type {string} */ (parts.pop());
const last_dir = /** @type {string} */ (parts.at(-1));
let name = basename.replace('.svelte', '');
if (name === 'index' && last_dir && last_dir !== 'src') {
name = last_dir;
}
return name[0].toUpperCase() + name.slice(1);
}
const RESERVED = ['$$props', '$$restProps', '$$slots'];
/**
* @param {Program} ast
* @param {ValidatedModuleCompileOptions} options
* @returns {Analysis}
*/
export function analyze_module(ast, options) {
const { scope, scopes } = create_scopes(ast, new ScopeRoot(), false, null);
for (const [name, references] of scope.references) {
if (name[0] !== '$' || RESERVED.includes(name)) continue;
if (name === '$' || name[1] === '$') {
e.global_reference_invalid(references[0].node, name);
}
const binding = scope.get(name.slice(1));
if (binding !== null && !is_rune(name)) {
e.store_invalid_subscription_module(references[0].node);
}
}
walk(
/** @type {Node} */ (ast),
{
scope,
scopes,
// @ts-expect-error TODO
analysis: { runes: true }
},
visitors
);
return {
module: { ast, scope, scopes },
name: options.filename,
accessors: false,
runes: true,
immutable: true
};
}
/**
* @param {AST.Root} root
* @param {string} source
* @param {ValidatedCompileOptions} options
* @returns {ComponentAnalysis}
*/
export function analyze_component(root, source, options) {
const scope_root = new ScopeRoot();
const module = js(root.module, scope_root, false, null);
const instance = js(root.instance, scope_root, true, module.scope);
const { scope, scopes } = create_scopes(root.fragment, scope_root, false, instance.scope);
/** @type {Template} */
const template = { ast: root.fragment, scope, scopes };
// create synthetic bindings for store subscriptions
for (const [name, references] of module.scope.references) {
if (name[0] !== '$' || RESERVED.includes(name)) continue;
if (name === '$' || name[1] === '$') {
e.global_reference_invalid(references[0].node, name);
}
const store_name = name.slice(1);
const declaration = instance.scope.get(store_name);
// If we're not in legacy mode through the compiler option, assume the user
// is referencing a rune and not a global store.
if (
options.runes === false ||
!is_rune(name) ||
(declaration !== null &&
// const state = $state(0) is valid
(get_rune(declaration.initial, instance.scope) === null ||
// rune-line names received as props are valid too (but we have to protect against $props as store)
(store_name !== 'props' && get_rune(declaration.initial, instance.scope) === '$props')) &&
// allow `import { derived } from 'svelte/store'` in the same file as `const x = $derived(..)` because one is not a subscription to the other
!(
name === '$derived' &&
declaration.initial?.type === 'ImportDeclaration' &&
declaration.initial.source.value === 'svelte/store'
))
) {
let is_nested_store_subscription_node = undefined;
search: for (const reference of references) {
for (let i = reference.path.length - 1; i >= 0; i--) {
const scope =
scopes.get(reference.path[i]) ||
module.scopes.get(reference.path[i]) ||
instance.scopes.get(reference.path[i]);
if (scope) {
const owner = scope?.owner(store_name);
if (!!owner && owner !== module.scope && owner !== instance.scope) {
is_nested_store_subscription_node = reference.node;
break search;
}
break;
}
}
}
if (is_nested_store_subscription_node) {
e.store_invalid_scoped_subscription(is_nested_store_subscription_node);
}
if (options.runes !== false) {
if (declaration === null && /[a-z]/.test(store_name[0])) {
e.global_reference_invalid(references[0].node, name);
} else if (declaration !== null && is_rune(name)) {
for (const { node, path } of references) {
if (path.at(-1)?.type === 'CallExpression') {
w.store_rune_conflict(node, store_name);
}
}
}
}
if (module.ast) {
for (const { node, path } of references) {
// if the reference is inside module, error. this is a bit hacky but it works
if (
/** @type {number} */ (node.start) > /** @type {number} */ (module.ast.start) &&
/** @type {number} */ (node.end) < /** @type {number} */ (module.ast.end) &&
// const state = $state(0) is valid
get_rune(/** @type {Node} */ (path.at(-1)), module.scope) === null
) {
e.store_invalid_subscription(node);
}
}
}
const binding = instance.scope.declare(b.id(name), 'store_sub', 'synthetic');
binding.references = references;
instance.scope.references.set(name, references);
module.scope.references.delete(name);
}
}
const component_name = get_component_name(options.filename);
const runes = options.runes ?? Array.from(module.scope.references.keys()).some(is_rune);
if (runes && root.module) {
const context = root.module.attributes.find((attribute) => attribute.name === 'context');
if (context) {
w.script_context_deprecated(context);
}
}
// TODO remove all the ?? stuff, we don't need it now that we're validating the config
/** @type {ComponentAnalysis} */
const analysis = {
name: module.scope.generate(options.name ?? component_name),
root: scope_root,
module,
instance,
template,
elements: [],
runes,
immutable: runes || options.immutable,
exports: [],
uses_props: false,
uses_rest_props: false,
uses_slots: false,
uses_component_bindings: false,
uses_render_tags: false,
needs_context: false,
needs_props: false,
event_directive_node: null,
uses_event_attributes: false,
custom_element: options.customElementOptions ?? options.customElement,
inject_styles: options.css === 'injected' || options.customElement,
accessors: options.customElement
? true
: (runes ? false : !!options.accessors) ||
// because $set method needs accessors
options.compatibility?.componentApi === 4,
reactive_statements: new Map(),
binding_groups: new Map(),
slot_names: new Map(),
top_level_snippets: [],
css: {
ast: root.css,
hash: root.css
? options.cssHash({
css: root.css.content.styles,
filename: options.filename,
name: component_name,
hash
})
: '',
keyframes: []
},
source
};
if (!runes) {
// every exported `let` or `var` declaration becomes a prop, everything else becomes an export
for (const node of instance.ast.body) {
if (node.type !== 'ExportNamedDeclaration') continue;
analysis.needs_props = true;
if (node.declaration) {
if (
node.declaration.type === 'FunctionDeclaration' ||
node.declaration.type === 'ClassDeclaration'
) {
analysis.exports.push({
name: /** @type {import('estree').Identifier} */ (node.declaration.id).name,
alias: null
});
} else if (node.declaration.type === 'VariableDeclaration') {
if (node.declaration.kind === 'const') {
for (const declarator of node.declaration.declarations) {
for (const node of extract_identifiers(declarator.id)) {
analysis.exports.push({ name: node.name, alias: null });
}
}
} else {
for (const declarator of node.declaration.declarations) {
for (const id of extract_identifiers(declarator.id)) {
const binding = /** @type {Binding} */ (instance.scope.get(id.name));
binding.kind = 'bindable_prop';
}
}
}
}
} else {
for (const specifier of node.specifiers) {
const binding = instance.scope.get(specifier.local.name);
if (
binding &&
(binding.declaration_kind === 'var' || binding.declaration_kind === 'let')
) {
binding.kind = 'bindable_prop';
if (specifier.exported.name !== specifier.local.name) {
binding.prop_alias = specifier.exported.name;
}
} else {
analysis.exports.push({ name: specifier.local.name, alias: specifier.exported.name });
}
}
}
}
// if reassigned/mutated bindings are referenced in `$:` blocks
// or the template, turn them into state
for (const binding of instance.scope.declarations.values()) {
if (binding.kind !== 'normal') continue;
for (const { node, path } of binding.references) {
if (node === binding.node) continue;
if (binding.updated) {
if (
path[path.length - 1].type === 'StyleDirective' ||
path.some((node) => node.type === 'Fragment') ||
(path[1].type === 'LabeledStatement' && path[1].label.name === '$')
) {
binding.kind = 'state';
}
}
}
}
// more legacy nonsense: if an `each` binding is reassigned/mutated,
// treat the expression as being mutated as well
walk(/** @type {SvelteNode} */ (template.ast), null, {
EachBlock(node) {
const scope = /** @type {Scope} */ (template.scopes.get(node));
for (const binding of scope.declarations.values()) {
if (binding.updated) {
const state = { scope: /** @type {Scope} */ (scope.parent), scopes: template.scopes };
walk(node.expression, state, {
// @ts-expect-error
_: set_scope,
Identifier(node, context) {
const parent = /** @type {Expression} */ (context.path.at(-1));
if (is_reference(node, parent)) {
const binding = context.state.scope.get(node.name);
if (binding && binding.kind === 'normal') {
binding.kind = 'state';
binding.mutated = binding.updated = true;
}
}
}
});
break;
}
}
}
});
}
if (root.options) {
for (const attribute of root.options.attributes) {
if (attribute.name === 'accessors' && analysis.runes) {
w.options_deprecated_accessors(attribute);
}
if (attribute.name === 'customElement' && !options.customElement) {
w.options_missing_custom_element(attribute);
}
if (attribute.name === 'immutable' && analysis.runes) {
w.options_deprecated_immutable(attribute);
}
}
}
if (analysis.runes) {
const props_refs = module.scope.references.get('$$props');
if (props_refs) {
e.legacy_props_invalid(props_refs[0].node);
}
const rest_props_refs = module.scope.references.get('$$restProps');
if (rest_props_refs) {
e.legacy_rest_props_invalid(rest_props_refs[0].node);
}
for (const { ast, scope, scopes } of [module, instance, template]) {
/** @type {AnalysisState} */
const state = {
scope,
scopes,
analysis,
options,
ast_type: ast === instance.ast ? 'instance' : ast === template.ast ? 'template' : 'module',
parent_element: null,
has_props_rune: false,
component_slots: new Set(),
expression: null,
render_tag: null,
private_derived_state: [],
function_depth: scope.function_depth,
instance_scope: instance.scope,
reactive_statement: null,
reactive_statements: new Map()
};
walk(/** @type {SvelteNode} */ (ast), state, visitors);
}
// warn on any nonstate declarations that are a) reassigned and b) referenced in the template
for (const scope of [module.scope, instance.scope]) {
outer: for (const [name, binding] of scope.declarations) {
if (binding.kind === 'normal' && binding.reassigned) {
inner: for (const { path } of binding.references) {
if (path[0].type !== 'Fragment') continue;
for (let i = 1; i < path.length; i += 1) {
const type = path[i].type;
if (
type === 'FunctionDeclaration' ||
type === 'FunctionExpression' ||
type === 'ArrowFunctionExpression'
) {
continue inner;
}
// bind:this doesn't need to be a state reference if it will never change
if (
type === 'BindDirective' &&
/** @type {AST.BindDirective} */ (path[i]).name === 'this'
) {
for (let j = i - 1; j >= 0; j -= 1) {
const type = path[j].type;
if (
type === 'IfBlock' ||
type === 'EachBlock' ||
type === 'AwaitBlock' ||
type === 'KeyBlock'
) {
w.non_reactive_update(binding.node, name);
continue outer;
}
}
continue inner;
}
}
w.non_reactive_update(binding.node, name);
continue outer;
}
}
}
}
} else {
instance.scope.declare(b.id('$$props'), 'rest_prop', 'synthetic');
instance.scope.declare(b.id('$$restProps'), 'rest_prop', 'synthetic');
for (const { ast, scope, scopes } of [module, instance, template]) {
/** @type {AnalysisState} */
const state = {
scope,
scopes,
analysis,
options,
parent_element: null,
has_props_rune: false,
ast_type: ast === instance.ast ? 'instance' : ast === template.ast ? 'template' : 'module',
instance_scope: instance.scope,
reactive_statement: null,
reactive_statements: analysis.reactive_statements,
component_slots: new Set(),
expression: null,
render_tag: null,
private_derived_state: [],
function_depth: scope.function_depth
};
walk(/** @type {SvelteNode} */ (ast), state, visitors);
}
for (const [name, binding] of instance.scope.declarations) {
if (
(binding.kind === 'prop' || binding.kind === 'bindable_prop') &&
binding.node.name !== '$$props'
) {
const references = binding.references.filter(
(r) => r.node !== binding.node && r.path.at(-1)?.type !== 'ExportSpecifier'
);
if (!references.length && !instance.scope.declarations.has(`$${name}`)) {
w.export_let_unused(binding.node, name);
}
}
}
analysis.reactive_statements = order_reactive_statements(analysis.reactive_statements);
}
if (analysis.event_directive_node && analysis.uses_event_attributes) {
e.mixed_event_handler_syntaxes(
analysis.event_directive_node,
analysis.event_directive_node.name
);
}
if (
analysis.uses_render_tags &&
(analysis.uses_slots || (!analysis.custom_element && analysis.slot_names.size > 0))
) {
const pos = analysis.slot_names.values().next().value ?? analysis.source.indexOf('$$slot');
e.slot_snippet_conflict(pos);
}
if (analysis.css.ast) {
analyze_css(analysis.css.ast, analysis);
// mark nodes as scoped/unused/empty etc
for (const element of analysis.elements) {
prune(analysis.css.ast, element);
}
const { comment } = analysis.css.ast.content;
const should_ignore_unused =
comment &&
extract_svelte_ignore(comment.start, comment.data, analysis.runes).includes(
'css_unused_selector'
);
if (!should_ignore_unused) {
warn_unused(analysis.css.ast);
}
outer: for (const element of analysis.elements) {
if (element.type === 'RenderTag') continue;
if (element.metadata.scoped) {
// Dynamic elements in dom mode always use spread for attributes and therefore shouldn't have a class attribute added to them
// TODO this happens during the analysis phase, which shouldn't know anything about client vs server
if (element.type === 'SvelteElement' && options.generate === 'client') continue;
/** @type {AST.Attribute | undefined} */
let class_attribute = undefined;
for (const attribute of element.attributes) {
if (attribute.type === 'SpreadAttribute') {
// The spread method appends the hash to the end of the class attribute on its own
continue outer;
}
if (attribute.type !== 'Attribute') continue;
if (attribute.name.toLowerCase() !== 'class') continue;
class_attribute = attribute;
}
if (class_attribute && class_attribute.value !== true) {
if (is_text_attribute(class_attribute)) {
class_attribute.value[0].data += ` ${analysis.css.hash}`;
} else {
/** @type {AST.Text} */
const css_text = {
type: 'Text',
data: ` ${analysis.css.hash}`,
raw: ` ${analysis.css.hash}`,
start: -1,
end: -1,
parent: null
};
if (Array.isArray(class_attribute.value)) {
class_attribute.value.push(css_text);
} else {
class_attribute.value = [class_attribute.value, css_text];
}
}
} else {
element.attributes.push(
create_attribute('class', -1, -1, [
{
type: 'Text',
data: analysis.css.hash,
raw: analysis.css.hash,
parent: null,
start: -1,
end: -1
}
])
);
if (is_custom_element_node(element) && element.attributes.length === 1) {
mark_subtree_dynamic(element.metadata.path);
}
}
}
}
}
// TODO
// analysis.stylesheet.warn_on_unused_selectors(analysis);
return analysis;
}
/**
* @param {Map<import('estree').LabeledStatement, ReactiveStatement>} unsorted_reactive_declarations
*/
function order_reactive_statements(unsorted_reactive_declarations) {
/** @typedef {[import('estree').LabeledStatement, ReactiveStatement]} Tuple */
/** @type {Map<string, Array<Tuple>>} */
const lookup = new Map();
for (const [node, declaration] of unsorted_reactive_declarations) {
for (const binding of declaration.assignments) {
const statements = lookup.get(binding.node.name) ?? [];
statements.push([node, declaration]);
lookup.set(binding.node.name, statements);
}
}
/** @type {Array<[string, string]>} */
const edges = [];
for (const [, { assignments, dependencies }] of unsorted_reactive_declarations) {
for (const assignment of assignments) {
for (const dependency of dependencies) {
if (!assignments.has(dependency)) {
edges.push([assignment.node.name, dependency.node.name]);
}
}
}
}
const cycle = check_graph_for_cycles(edges);
if (cycle?.length) {
const declaration = /** @type {Tuple[]} */ (lookup.get(cycle[0]))[0];
e.reactive_declaration_cycle(declaration[0], cycle.join(' → '));
}
// We use a map and take advantage of the fact that the spec says insertion order is preserved when iterating
/** @type {Map<import('estree').LabeledStatement, ReactiveStatement>} */
const reactive_declarations = new Map();
/**
*
* @param {import('estree').LabeledStatement} node
* @param {ReactiveStatement} declaration
* @returns
*/
const add_declaration = (node, declaration) => {
if ([...reactive_declarations.values()].includes(declaration)) return;
for (const binding of declaration.dependencies) {
if (declaration.assignments.has(binding)) continue;
for (const [node, earlier] of lookup.get(binding.node.name) ?? []) {
add_declaration(node, earlier);
}
}
reactive_declarations.set(node, declaration);
};
for (const [node, declaration] of unsorted_reactive_declarations) {
add_declaration(node, declaration);
}
return reactive_declarations;
}
|