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 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 45x 3x 3x 3x 42x 42x 42x 42x 42x 42x 42x 42x 42x 42x 42x 112x 112x 62x 112x 61x 61x 61x 61x 61x 61x 55x 55x 13x 13x 13x 13x 13x 13x 13x 13x 1x 13x 12x 12x 13x 55x 61x 112x 42x 42x 42x 12x 12x 12x 12x 12x 12x 42x 42x 42x 42x 42x 42x 42x 42x 112x 112x 62x 112x 61x 61x 61x 61x 61x 61x 13x 13x 13x 13x 13x 13x 13x 1x 13x 12x 12x 12x 12x 12x 12x 12x 12x 12x 13x 13x 13x 61x 99x 99x 99x 42x 42x 42x | /** @import { ClassBody, Expression, MethodDefinition, PropertyDefinition } from 'estree' */
/** @import { Context } from '../types.js' */
/** @import { StateField } from '../../client/types.js' */
import { dev } from '../../../../state.js';
import * as b from '../../../../utils/builders.js';
import { get_rune } from '../../../scope.js';
/**
* @param {ClassBody} node
* @param {Context} context
*/
export function ClassBody(node, context) {
if (!context.state.analysis.runes) {
context.next();
return;
}
/** @type {Map<string, StateField>} */
const public_derived = new Map();
/** @type {Map<string, StateField>} */
const private_derived = new Map();
/** @type {string[]} */
const private_ids = [];
for (const definition of node.body) {
if (
definition.type === 'PropertyDefinition' &&
(definition.key.type === 'Identifier' || definition.key.type === 'PrivateIdentifier')
) {
const { type, name } = definition.key;
const is_private = type === 'PrivateIdentifier';
if (is_private) private_ids.push(name);
if (definition.value?.type === 'CallExpression') {
const rune = get_rune(definition.value, context.state.scope);
if (rune === '$derived' || rune === '$derived.by') {
/** @type {StateField} */
const field = {
kind: rune === '$derived.by' ? 'derived_by' : 'derived',
// @ts-expect-error this is set in the next pass
id: is_private ? definition.key : null
};
if (is_private) {
private_derived.set(name, field);
} else {
public_derived.set(name, field);
}
}
}
}
}
// each `foo = $derived()` needs a backing `#foo` field
for (const [name, field] of public_derived) {
let deconflicted = name;
while (private_ids.includes(deconflicted)) {
deconflicted = '_' + deconflicted;
}
private_ids.push(deconflicted);
field.id = b.private_id(deconflicted);
}
/** @type {Array<MethodDefinition | PropertyDefinition>} */
const body = [];
const child_state = { ...context.state, private_derived };
// Replace parts of the class body
for (const definition of node.body) {
if (
definition.type === 'PropertyDefinition' &&
(definition.key.type === 'Identifier' || definition.key.type === 'PrivateIdentifier')
) {
const name = definition.key.name;
const is_private = definition.key.type === 'PrivateIdentifier';
const field = (is_private ? private_derived : public_derived).get(name);
if (definition.value?.type === 'CallExpression' && field !== undefined) {
const init = /** @type {Expression} **/ (
context.visit(definition.value.arguments[0], child_state)
);
const value =
field.kind === 'derived_by' ? b.call('$.once', init) : b.call('$.once', b.thunk(init));
if (is_private) {
body.push(b.prop_def(field.id, value));
} else {
// #foo;
const member = b.member(b.this, field.id);
body.push(b.prop_def(field.id, value));
// get foo() { return this.#foo; }
body.push(b.method('get', definition.key, [], [b.return(b.call(member))]));
if (dev && (field.kind === 'derived' || field.kind === 'derived_by')) {
body.push(
b.method(
'set',
definition.key,
[b.id('_')],
[b.throw_error(`Cannot update a derived property ('${name}')`)]
)
);
}
}
continue;
}
}
body.push(/** @type {MethodDefinition} **/ (context.visit(definition, child_state)));
}
return { ...node, body };
}
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