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 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 3328x 3328x 3328x 3328x 874x 875x 875x 875x 875x 875x 875x 875x 875x 875x 621x 875x 254x 7x 7x 7x 7x 7x 7x 247x 247x 247x 621x 875x 122x 122x 122x 122x 122x 122x 1x 1x 1x 1x 1x 1x 121x 121x 121x 121x 174x 160x 160x 160x 160x 160x 160x 160x 160x 160x 160x 160x 160x 160x 160x 160x 160x 4x 160x 2x 2x 160x 160x 64x 64x 64x 64x 174x 14x 14x 14x 14x 14x 1x 1x 1x 14x 14x 14x 174x 121x 122x 122x 122x 122x 499x 499x 499x 875x 875x 875x 437x 437x 437x 437x 437x 437x 437x 437x 437x 134x 134x 437x 329x 329x 437x 437x 437x 437x 435x 435x 435x 437x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 437x 437x 437x 62x 875x 62x 56x 56x 56x 56x 56x 56x 62x 6x 6x 6x 6x 6x 6x 6x 6x 6x 3x 3x 3x 3x 3x 3x 3x 3x 3x 6x 6x 16x 16x 16x 16x 16x 6x 62x 62x 875x 3328x 2454x 2794x 2794x 2794x 2794x 2794x 516x 516x 516x 516x 516x 516x 516x 2278x 2794x 1937x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 31x 31x 31x 31x 31x 31x 31x 31x 31x 31x 31x 31x 5x 5x 5x 1932x 1932x 1932x 1932x 1932x 1932x 1932x 1932x 1932x 1937x 1937x 1937x 1937x 1937x 1937x 1937x 1937x 341x 341x 341x 341x 341x 2794x 2794x 2794x 2794x 2454x 3328x 3328x 77x 77x 3251x 3251x 3251x 3251x 3251x 3251x 2x 2x 2x 2x 2x 2x 2x 341x 341x 339x 339x 2x 2x 2x 2x 2x 2x 8x 8x 8x 8x 8x 8x 2x 2x 2x | /** @import { CallExpression, Expression, Identifier, Literal, VariableDeclaration, VariableDeclarator } from 'estree' */
/** @import { Binding } from '#compiler' */
/** @import { ComponentContext } from '../types' */
/** @import { Scope } from '../../../scope' */
import { dev } from '../../../../state.js';
import { extract_paths } from '../../../../utils/ast.js';
import * as b from '../../../../utils/builders.js';
import * as assert from '../../../../utils/assert.js';
import { get_rune } from '../../../scope.js';
import {
get_prop_source,
is_prop_source,
is_state_source,
should_proxy_or_freeze
} from '../utils.js';
import { is_hoisted_function } from '../../utils.js';
/**
* @param {VariableDeclaration} node
* @param {ComponentContext} context
*/
export function VariableDeclaration(node, context) {
/** @type {VariableDeclarator[]} */
const declarations = [];
if (context.state.analysis.runes) {
for (const declarator of node.declarations) {
const init = declarator.init;
const rune = get_rune(init, context.state.scope);
if (
!rune ||
rune === '$effect.tracking' ||
rune === '$effect.root' ||
rune === '$inspect' ||
rune === '$state.snapshot' ||
rune === '$state.is'
) {
if (init != null && is_hoisted_function(init)) {
context.state.hoisted.push(
b.declaration('const', declarator.id, /** @type {Expression} */ (context.visit(init)))
);
continue;
}
declarations.push(/** @type {VariableDeclarator} */ (context.visit(declarator)));
continue;
}
if (rune === '$props') {
/** @type {string[]} */
const seen = ['$$slots', '$$events', '$$legacy'];
if (context.state.analysis.custom_element) {
seen.push('$$host');
}
if (declarator.id.type === 'Identifier') {
/** @type {Expression[]} */
const args = [b.id('$$props'), b.array(seen.map((name) => b.literal(name)))];
if (dev) {
// include rest name, so we can provide informative error messages
args.push(b.literal(declarator.id.name));
}
declarations.push(b.declarator(declarator.id, b.call('$.rest_props', ...args)));
} else {
assert.equal(declarator.id.type, 'ObjectPattern');
for (const property of declarator.id.properties) {
if (property.type === 'Property') {
const key = /** @type {Identifier | Literal} */ (property.key);
const name = key.type === 'Identifier' ? key.name : /** @type {string} */ (key.value);
seen.push(name);
let id =
property.value.type === 'AssignmentPattern' ? property.value.left : property.value;
assert.equal(id.type, 'Identifier');
const binding = /** @type {Binding} */ (context.state.scope.get(id.name));
let initial =
binding.initial && /** @type {Expression} */ (context.visit(binding.initial));
// We're adding proxy here on demand and not within the prop runtime function so that
// people not using proxied state anywhere in their code don't have to pay the additional bundle size cost
if (
initial &&
binding.kind === 'bindable_prop' &&
should_proxy_or_freeze(initial, context.state.scope)
) {
initial = b.call('$.proxy', initial);
}
if (is_prop_source(binding, context.state)) {
declarations.push(
b.declarator(id, get_prop_source(binding, context.state, name, initial))
);
}
} else {
// RestElement
/** @type {Expression[]} */
const args = [b.id('$$props'), b.array(seen.map((name) => b.literal(name)))];
if (dev) {
// include rest name, so we can provide informative error messages
args.push(b.literal(/** @type {Identifier} */ (property.argument).name));
}
declarations.push(b.declarator(property.argument, b.call('$.rest_props', ...args)));
}
}
}
// TODO
continue;
}
const args = /** @type {CallExpression} */ (init).arguments;
const value =
args.length === 0 ? b.id('undefined') : /** @type {Expression} */ (context.visit(args[0]));
if (rune === '$state' || rune === '$state.frozen') {
/**
* @param {Identifier} id
* @param {Expression} value
*/
const create_state_declarator = (id, value) => {
const binding = /** @type {import('#compiler').Binding} */ (
context.state.scope.get(id.name)
);
if (should_proxy_or_freeze(value, context.state.scope)) {
value = b.call(rune === '$state' ? '$.proxy' : '$.freeze', value);
}
if (is_state_source(binding, context.state)) {
value = b.call('$.source', value);
}
return value;
};
if (declarator.id.type === 'Identifier') {
declarations.push(
b.declarator(declarator.id, create_state_declarator(declarator.id, value))
);
} else {
const tmp = context.state.scope.generate('tmp');
const paths = extract_paths(declarator.id);
declarations.push(
b.declarator(b.id(tmp), value),
...paths.map((path) => {
const value = path.expression?.(b.id(tmp));
const binding = context.state.scope.get(/** @type {Identifier} */ (path.node).name);
return b.declarator(
path.node,
binding?.kind === 'state' || binding?.kind === 'frozen_state'
? create_state_declarator(binding.node, value)
: value
);
})
);
}
continue;
}
if (rune === '$derived' || rune === '$derived.by') {
if (declarator.id.type === 'Identifier') {
declarations.push(
b.declarator(
declarator.id,
b.call('$.derived', rune === '$derived.by' ? value : b.thunk(value))
)
);
} else {
const bindings = extract_paths(declarator.id);
const init = /** @type {CallExpression} */ (declarator.init);
/** @type {Identifier} */
let id;
let rhs = value;
if (init.arguments[0].type === 'Identifier') {
id = init.arguments[0];
} else {
id = b.id(context.state.scope.generate('$$d'));
rhs = b.call('$.get', id);
declarations.push(
b.declarator(id, b.call('$.derived', rune === '$derived.by' ? value : b.thunk(value)))
);
}
for (let i = 0; i < bindings.length; i++) {
const binding = bindings[i];
declarations.push(
b.declarator(binding.node, b.call('$.derived', b.thunk(binding.expression(rhs))))
);
}
}
continue;
}
}
} else {
for (const declarator of node.declarations) {
const bindings = /** @type {Binding[]} */ (context.state.scope.get_bindings(declarator));
const has_state = bindings.some((binding) => binding.kind === 'state');
const has_props = bindings.some((binding) => binding.kind === 'bindable_prop');
if (!has_state && !has_props) {
const init = declarator.init;
if (init != null && is_hoisted_function(init)) {
context.state.hoisted.push(
b.declaration('const', declarator.id, /** @type {Expression} */ (context.visit(init)))
);
continue;
}
declarations.push(/** @type {VariableDeclarator} */ (context.visit(declarator)));
continue;
}
if (has_props) {
if (declarator.id.type !== 'Identifier') {
// Turn export let into props. It's really really weird because export let { x: foo, z: [bar]} = ..
// means that foo and bar are the props (i.e. the leafs are the prop names), not x and z.
const tmp = context.state.scope.generate('tmp');
const paths = extract_paths(declarator.id);
declarations.push(
b.declarator(
b.id(tmp),
/** @type {Expression} */ (context.visit(/** @type {Expression} */ (declarator.init)))
)
);
for (const path of paths) {
const name = /** @type {Identifier} */ (path.node).name;
const binding = /** @type {Binding} */ (context.state.scope.get(name));
const value = path.expression?.(b.id(tmp));
declarations.push(
b.declarator(
path.node,
binding.kind === 'bindable_prop'
? get_prop_source(binding, context.state, binding.prop_alias ?? name, value)
: value
)
);
}
continue;
}
const binding = /** @type {Binding} */ (context.state.scope.get(declarator.id.name));
declarations.push(
b.declarator(
declarator.id,
get_prop_source(
binding,
context.state,
binding.prop_alias ?? declarator.id.name,
declarator.init && /** @type {Expression} */ (context.visit(declarator.init))
)
)
);
continue;
}
declarations.push(
...create_state_declarators(
declarator,
context.state.scope,
/** @type {Expression} */ (declarator.init && context.visit(declarator.init))
)
);
}
}
if (declarations.length === 0) {
return b.empty;
}
return {
...node,
declarations
};
}
/**
* Creates the output for a state declaration.
* @param {VariableDeclarator} declarator
* @param {Scope} scope
* @param {Expression} value
*/
function create_state_declarators(declarator, scope, value) {
if (declarator.id.type === 'Identifier') {
return [b.declarator(declarator.id, b.call('$.mutable_source', value))];
}
const tmp = scope.generate('tmp');
const paths = extract_paths(declarator.id);
return [
b.declarator(b.id(tmp), value),
...paths.map((path) => {
const value = path.expression?.(b.id(tmp));
const binding = scope.get(/** @type {Identifier} */ (path.node).name);
return b.declarator(
path.node,
binding?.kind === 'state' ? b.call('$.mutable_source', value) : value
);
})
];
}
|