25 lines
788 B
Plaintext
25 lines
788 B
Plaintext
/**
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* Extractor function for an UpdateExpression type value node.
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* An update expression is an expression with an update operator.
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* For example, foo++ will evaluate to foo + 1.
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*
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* @param - value - AST Value object with type `UpdateExpression`
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* @returns - The extracted value converted to correct type.
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*/
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export default function extractValueFromUpdateExpression(value) {
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// eslint-disable-next-line global-require
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const getValue = require('.').default;
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const { operator, argument, prefix } = value;
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let val = getValue(argument);
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switch (operator) {
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case '++':
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return prefix ? ++val : val++; // eslint-disable-line no-plusplus
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case '--':
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return prefix ? --val : val--; // eslint-disable-line no-plusplus
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default:
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return undefined;
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}
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}
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