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33 lines
959 B
33 lines
959 B
4 years ago
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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = extractValueFromUpdateExpression;
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/**
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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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function extractValueFromUpdateExpression(value) {
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// eslint-disable-next-line global-require
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var getValue = require('./index.js').default;
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var operator = value.operator,
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argument = value.argument,
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prefix = value.prefix;
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var 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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