mirror of https://github.com/sveltejs/svelte
40 lines
1.2 KiB
40 lines
1.2 KiB
import checkForDupes from '../utils/checkForDupes.js';
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import checkForComputedKeys from '../utils/checkForComputedKeys.js';
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const isFunctionExpression = {
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FunctionExpression: true,
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ArrowFunctionExpression: true
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};
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export default function computed ( validator, prop ) {
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if ( prop.value.type !== 'ObjectExpression' ) {
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validator.error( `The 'computed' property must be an object literal`, prop.start );
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return;
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}
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checkForDupes( validator, prop.value.properties );
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checkForComputedKeys( validator, prop.value.properties );
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prop.value.properties.forEach( computation => {
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if ( !isFunctionExpression[ computation.value.type ] ) {
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validator.error( `Computed properties can be function expressions or arrow function expressions`, computation.value.start );
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return;
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}
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const params = computation.value.params;
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if ( params.length === 0 ) {
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validator.error( `A computed value must depend on at least one property`, computation.value.start );
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return;
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}
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params.forEach( param => {
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const valid = param.type === 'Identifier' || param.type === 'AssignmentPattern' && param.left.type === 'Identifier';
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if ( !valid ) {
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validator.error( `Computed properties cannot use destructuring in function parameters`, param.start );
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}
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});
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});
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}
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