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 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 9169x 4908x 4908x 9169x 9169x 210x 210x 8959x 8959x 8959x 2x 2x 2x 2x 2x 2x 2x 27099x 27099x 27099x 26220x 27099x 27099x 2x 2x 2x 2x 2x 2x 2x 2x 2x 19348x 19348x 13350x 13350x 13350x 19348x 19348x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2636x 2636x 2636x 2636x 2x 2x 2x 2x 2x 2x 2x 6308x 6308x 2x 2x 2x 2x 2x 2x 2x 14340x 14340x 2x 2x 2x 2x 2x 2x 2x 2x 37167x 37167x 33419x 33419x 37167x 37167x 1148x 1148x 1148x 1148x 37167x 37167x 1511x 2607x 100x 2607x 2507x 2507x 2607x 1511x 1511x 37167x 37167x 499x 1308x 1308x 499x 499x 37167x 37167x 152x 152x 37167x 37167x 438x 438x 37167x 37167x 37167x 37167x 2x 2x 2x 2x 2x 2x 2x 28845x 28845x 2x 2x 2x 2x 2x 2x 2x 2x 181x 181x 181x 181x 181x 181x 181x 181x 181x 181x 233x 233x 193x 193x 233x 233x 10x 233x 223x 223x 181x 181x 21x 21x 21x 2x 21x 19x 19x 181x 181x 181x 181x 181x 181x 181x 2x 2x 2x 2x 2x 2x 2x 2x 89x 89x 89x 73x 73x 89x 89x 12x 20x 20x 20x 20x 12x 12x 89x 89x 4x 8x 8x 4x 4x 89x 89x 89x 89x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2227x 2227x 2227x 2227x 2227x 2227x 2227x 2227x 2x 2x 2x 2x 2x 2x 2x 2x 2x 3112x 3112x 3112x 3112x 2369x 2369x 2369x 2369x 2369x 2369x 2369x 2369x 3112x 3112x 447x 704x 33x 33x 3x 3x 3x 3x 14x 11x 7x 11x 3x 4x 1x 1x 11x 14x 3x 3x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 704x 671x 671x 671x 671x 671x 671x 671x 671x 671x 671x 671x 704x 447x 447x 3112x 3112x 103x 219x 219x 212x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 212x 196x 196x 196x 196x 196x 196x 196x 196x 196x 196x 212x 219x 219x 219x 3112x 3112x 193x 193x 193x 193x 191x 191x 191x 191x 191x 191x 191x 193x 2x 2x 193x 193x 193x 3112x 3112x 3112x 3112x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 5652x 5652x 5652x 5652x 5652x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2141x 2141x 2141x 2141x 507x 2141x 1634x 1634x 507x 2105x 2x 2x 2x 2x 2x 2x 505x 2141x 20x 20x 485x 485x 485x 2x 2x 2x 2x 2x 2x 2x 815x 815x 2x 2x 2x 2x 2x 2x 2252x 2252x 35x 35x 2252x 2252x 171x 294x 294x 294x 294x 294x 171x 171x 2252x 2252x 2252x 2252x 48x 48x 2252x 2252x 185x 185x 182x 255x 255x 255x 255x 182x 185x 185x 2252x 2252x 2x 2x 2x 2x 2x 2252x 2252x 188x 188x 187x 187x 188x 188x 2252x 2252x 198x 322x 322x 322x 322x 322x 322x 322x 198x 198x 2252x 2252x 2252x 7x 7x 2252x 2252x 2252x 1x 1x 2252x 2252x 1417x 2252x 2252x 2x 2x 2x 2x 2x 2x 2x 1076x 829x 829x 247x 1076x 5x 5x 242x 242x 1051x 1076x 1076x 2x 2x 2x 2x 2x 2x 2x 1238x 1238x 1238x 1238x 1238x | /** @import { AST, SvelteNode } from '#compiler' */
/** @import * as ESTree from 'estree' */
import { walk } from 'zimmerframe';
import * as b from '../utils/builders.js';
/**
* Gets the left-most identifier of a member expression or identifier.
* @param {ESTree.MemberExpression | ESTree.Identifier} expression
* @returns {ESTree.Identifier | null}
*/
export function object(expression) {
while (expression.type === 'MemberExpression') {
expression = /** @type {ESTree.MemberExpression | ESTree.Identifier} */ (expression.object);
}
if (expression.type !== 'Identifier') {
return null;
}
return expression;
}
/**
* Returns true if the attribute contains a single static text node.
* @param {AST.Attribute} attribute
* @returns {attribute is AST.Attribute & { value: [AST.Text] }}
*/
export function is_text_attribute(attribute) {
return (
Array.isArray(attribute.value) &&
attribute.value.length === 1 &&
attribute.value[0].type === 'Text'
);
}
/**
* Returns true if the attribute contains a single expression node.
* In Svelte 5, this also includes a single expression node wrapped in an array.
* TODO change that in a future version
* @param {AST.Attribute} attribute
* @returns {attribute is AST.Attribute & { value: [AST.ExpressionTag] | AST.ExpressionTag }}
*/
export function is_expression_attribute(attribute) {
return (
(attribute.value !== true && !Array.isArray(attribute.value)) ||
(Array.isArray(attribute.value) &&
attribute.value.length === 1 &&
attribute.value[0].type === 'ExpressionTag')
);
}
/**
* Returns the single attribute expression node.
* In Svelte 5, this also includes a single expression node wrapped in an array.
* TODO change that in a future version
* @param { AST.Attribute & { value: [AST.ExpressionTag] | AST.ExpressionTag }} attribute
* @returns {ESTree.Expression}
*/
export function get_attribute_expression(attribute) {
return Array.isArray(attribute.value)
? /** @type {AST.ExpressionTag} */ (attribute.value[0]).expression
: attribute.value.expression;
}
/**
* Returns the expression chunks of an attribute value
* @param {AST.Attribute['value']} value
* @returns {Array<AST.Text | AST.ExpressionTag>}
*/
export function get_attribute_chunks(value) {
return Array.isArray(value) ? value : typeof value === 'boolean' ? [] : [value];
}
/**
* Returns true if the attribute starts with `on` and contains a single expression node.
* @param {AST.Attribute} attribute
* @returns {attribute is AST.Attribute & { value: [AST.ExpressionTag] | AST.ExpressionTag }}
*/
export function is_event_attribute(attribute) {
return is_expression_attribute(attribute) && attribute.name.startsWith('on');
}
/**
* Extracts all identifiers and member expressions from a pattern.
* @param {ESTree.Pattern} pattern
* @param {Array<ESTree.Identifier | ESTree.MemberExpression>} [nodes]
* @returns {Array<ESTree.Identifier | ESTree.MemberExpression>}
*/
export function unwrap_pattern(pattern, nodes = []) {
switch (pattern.type) {
case 'Identifier':
nodes.push(pattern);
break;
case 'MemberExpression':
// member expressions can be part of an assignment pattern, but not a binding pattern
// see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment#binding_and_assignment
nodes.push(pattern);
break;
case 'ObjectPattern':
for (const prop of pattern.properties) {
if (prop.type === 'RestElement') {
unwrap_pattern(prop.argument, nodes);
} else {
unwrap_pattern(prop.value, nodes);
}
}
break;
case 'ArrayPattern':
for (const element of pattern.elements) {
if (element) unwrap_pattern(element, nodes);
}
break;
case 'RestElement':
unwrap_pattern(pattern.argument, nodes);
break;
case 'AssignmentPattern':
unwrap_pattern(pattern.left, nodes);
break;
}
return nodes;
}
/**
* Extracts all identifiers from a pattern.
* @param {ESTree.Pattern} pattern
* @returns {ESTree.Identifier[]}
*/
export function extract_identifiers(pattern) {
return unwrap_pattern(pattern, []).filter((node) => node.type === 'Identifier');
}
/**
* Extracts all identifiers and a stringified keypath from an expression.
* TODO replace this with `expression.dependencies`
* @param {ESTree.Expression} expr
* @returns {[keypath: string, ids: ESTree.Identifier[]]}
*/
export function extract_all_identifiers_from_expression(expr) {
/** @type {ESTree.Identifier[]} */
let nodes = [];
/** @type {string[]} */
let keypath = [];
walk(
expr,
{},
{
Identifier(node, { path }) {
const parent = path.at(-1);
if (parent?.type !== 'MemberExpression' || parent.property !== node || parent.computed) {
nodes.push(node);
}
if (parent?.type === 'MemberExpression' && parent.computed && parent.property === node) {
keypath.push(`[${node.name}]`);
} else {
keypath.push(node.name);
}
},
Literal(node, { path }) {
const value = typeof node.value === 'string' ? `"${node.value}"` : String(node.value);
const parent = path.at(-1);
if (parent?.type === 'MemberExpression' && parent.computed && parent.property === node) {
keypath.push(`[${value}]`);
} else {
keypath.push(value);
}
},
ThisExpression(_, { next }) {
keypath.push('this');
next();
}
}
);
return [keypath.join('.'), nodes];
}
/**
* Extracts all leaf identifiers from a destructuring expression.
* @param {ESTree.Identifier | ESTree.ObjectExpression | ESTree.ArrayExpression} node
* @param {ESTree.Identifier[]} [nodes]
* @returns
*/
export function extract_identifiers_from_destructuring(node, nodes = []) {
// TODO This isn't complete, but it should be enough for our purposes
switch (node.type) {
case 'Identifier':
nodes.push(node);
break;
case 'ObjectExpression':
for (const prop of node.properties) {
if (prop.type === 'Property') {
extract_identifiers_from_destructuring(/** @type {any} */ (prop.value), nodes);
} else {
extract_identifiers_from_destructuring(/** @type {any} */ (prop.argument), nodes);
}
}
break;
case 'ArrayExpression':
for (const element of node.elements) {
if (element) extract_identifiers_from_destructuring(/** @type {any} */ (element), nodes);
}
break;
}
return nodes;
}
/**
* Represents the path of a destructured assignment from either a declaration
* or assignment expression. For example, given `const { foo: { bar: baz } } = quux`,
* the path of `baz` is `foo.bar`
* @typedef {Object} DestructuredAssignment
* @property {ESTree.Identifier | ESTree.MemberExpression} node The node the destructuring path end in. Can be a member expression only for assignment expressions
* @property {boolean} is_rest `true` if this is a `...rest` destructuring
* @property {boolean} has_default_value `true` if this has a fallback value like `const { foo = 'bar } = ..`
* @property {(expression: ESTree.Expression) => ESTree.Identifier | ESTree.MemberExpression | ESTree.CallExpression | ESTree.AwaitExpression} expression Returns an expression which walks the path starting at the given expression.
* This will be a call expression if a rest element or default is involved — e.g. `const { foo: { bar: baz = 42 }, ...rest } = quux` — since we can't represent `baz` or `rest` purely as a path
* Will be an await expression in case of an async default value (`const { foo = await bar } = ...`)
* @property {(expression: ESTree.Expression) => ESTree.Identifier | ESTree.MemberExpression | ESTree.CallExpression | ESTree.AwaitExpression} update_expression Like `expression` but without default values.
*/
/**
* Extracts all destructured assignments from a pattern.
* @param {ESTree.Node} param
* @returns {DestructuredAssignment[]}
*/
export function extract_paths(param) {
return _extract_paths(
[],
param,
(node) => /** @type {ESTree.Identifier | ESTree.MemberExpression} */ (node),
(node) => /** @type {ESTree.Identifier | ESTree.MemberExpression} */ (node),
false
);
}
/**
* @param {DestructuredAssignment[]} assignments
* @param {ESTree.Node} param
* @param {DestructuredAssignment['expression']} expression
* @param {DestructuredAssignment['update_expression']} update_expression
* @param {boolean} has_default_value
* @returns {DestructuredAssignment[]}
*/
function _extract_paths(assignments = [], param, expression, update_expression, has_default_value) {
switch (param.type) {
case 'Identifier':
case 'MemberExpression':
assignments.push({
node: param,
is_rest: false,
has_default_value,
expression,
update_expression
});
break;
case 'ObjectPattern':
for (const prop of param.properties) {
if (prop.type === 'RestElement') {
/** @type {DestructuredAssignment['expression']} */
const rest_expression = (object) => {
/** @type {ESTree.Expression[]} */
const props = [];
for (const p of param.properties) {
if (p.type === 'Property' && p.key.type !== 'PrivateIdentifier') {
if (p.key.type === 'Identifier' && !p.computed) {
props.push(b.literal(p.key.name));
} else if (p.key.type === 'Literal') {
props.push(b.literal(String(p.key.value)));
} else {
props.push(b.call('String', p.key));
}
}
}
return b.call('$.exclude_from_object', expression(object), b.array(props));
};
if (prop.argument.type === 'Identifier') {
assignments.push({
node: prop.argument,
is_rest: true,
has_default_value,
expression: rest_expression,
update_expression: rest_expression
});
} else {
_extract_paths(
assignments,
prop.argument,
rest_expression,
rest_expression,
has_default_value
);
}
} else {
/** @type {DestructuredAssignment['expression']} */
const object_expression = (object) =>
b.member(expression(object), prop.key, prop.computed || prop.key.type !== 'Identifier');
_extract_paths(
assignments,
prop.value,
object_expression,
object_expression,
has_default_value
);
}
}
break;
case 'ArrayPattern':
for (let i = 0; i < param.elements.length; i += 1) {
const element = param.elements[i];
if (element) {
if (element.type === 'RestElement') {
/** @type {DestructuredAssignment['expression']} */
const rest_expression = (object) =>
b.call(b.member(expression(object), 'slice'), b.literal(i));
if (element.argument.type === 'Identifier') {
assignments.push({
node: element.argument,
is_rest: true,
has_default_value,
expression: rest_expression,
update_expression: rest_expression
});
} else {
_extract_paths(
assignments,
element.argument,
rest_expression,
rest_expression,
has_default_value
);
}
} else {
/** @type {DestructuredAssignment['expression']} */
const array_expression = (object) => b.member(expression(object), b.literal(i), true);
_extract_paths(
assignments,
element,
array_expression,
array_expression,
has_default_value
);
}
}
}
break;
case 'AssignmentPattern': {
/** @type {DestructuredAssignment['expression']} */
const fallback_expression = (object) => build_fallback(expression(object), param.right);
if (param.left.type === 'Identifier') {
assignments.push({
node: param.left,
is_rest: false,
has_default_value: true,
expression: fallback_expression,
update_expression
});
} else {
_extract_paths(assignments, param.left, fallback_expression, update_expression, true);
}
break;
}
}
return assignments;
}
/**
* Like `path.at(x)`, but skips over `TSNonNullExpression` and `TSAsExpression` nodes and eases assertions a bit
* by removing the `| undefined` from the resulting type.
*
* @template {SvelteNode} T
* @param {T[]} path
* @param {number} at
*/
export function get_parent(path, at) {
let node = path.at(at);
// @ts-expect-error
if (node.type === 'TSNonNullExpression' || node.type === 'TSAsExpression') {
return /** @type {T} */ (path.at(at < 0 ? at - 1 : at + 1));
}
return /** @type {T} */ (node);
}
/**
* Returns `true` if the expression is an identifier, a literal, a function expression,
* or a logical expression that only contains simple expressions. Used to determine whether
* something needs to be treated as though accessing it could have side-effects (i.e.
* reading signals prematurely)
* @param {ESTree.Expression} node
* @returns {boolean}
*/
export function is_simple_expression(node) {
if (
node.type === 'Literal' ||
node.type === 'Identifier' ||
node.type === 'ArrowFunctionExpression' ||
node.type === 'FunctionExpression'
) {
return true;
}
if (node.type === 'ConditionalExpression') {
return (
is_simple_expression(node.test) &&
is_simple_expression(node.consequent) &&
is_simple_expression(node.alternate)
);
}
if (node.type === 'BinaryExpression' || node.type === 'LogicalExpression') {
return is_simple_expression(node.left) && is_simple_expression(node.right);
}
return false;
}
/**
* @template {ESTree.SimpleCallExpression | ESTree.MemberExpression} T
* @param {ESTree.ChainExpression & { expression : T } | T} node
* @returns {T}
*/
export function unwrap_optional(node) {
return node.type === 'ChainExpression' ? node.expression : node;
}
/**
* @param {ESTree.Expression | ESTree.Pattern} expression
* @returns {boolean}
*/
export 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;
}
}
/**
*
* @param {ESTree.Expression} expression
* @param {ESTree.Expression} fallback
*/
export function build_fallback(expression, fallback) {
if (is_simple_expression(fallback)) {
return b.call('$.fallback', expression, fallback);
}
if (fallback.type === 'AwaitExpression' && is_simple_expression(fallback.argument)) {
return b.await(b.call('$.fallback', expression, fallback.argument));
}
return is_expression_async(fallback)
? b.await(b.call('$.fallback', expression, b.thunk(fallback, true), b.true))
: b.call('$.fallback', expression, b.thunk(fallback), b.true);
}
/**
* @param {ESTree.AssignmentOperator} operator
* @param {ESTree.Identifier | ESTree.MemberExpression} left
* @param {ESTree.Expression} right
*/
export function build_assignment_value(operator, left, right) {
return operator === '='
? right
: // turn something like x += 1 into x = x + 1
b.binary(/** @type {ESTree.BinaryOperator} */ (operator.slice(0, -1)), left, right);
}
|