25 lines
677 B
JavaScript
25 lines
677 B
JavaScript
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export default function(node, {evaluate, scope}) {
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const unary = (arg) => {
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switch (node.operator) {
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case '+' : return +arg;
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case '-' : return -arg;
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case '!' : return !arg;
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case '~' : return ~arg;
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case 'typeof': return typeof arg;
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case 'void' : return undefined;
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// case 'delete': ...
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/* v8 ignore next 2 */
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default:
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throw new Error(`operator not implemented: ${node.operator}`);
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}
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};
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const arg = evaluate(node.argument, {scope});
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if (arg.async) {
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return {
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async: true,
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value: Promise.resolve(arg.value).then(unary),
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};
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}
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return {value: unary(arg.value)};
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}
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