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codeql-action/node_modules/jsx-ast-utils/src/values/expressions/UnaryExpression.js
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/** | |
* Extractor function for a UnaryExpression type value node. | |
* A unary expression is an expression with a unary operator. | |
* For example, !"foobar" will evaluate to false, so this will return false. | |
* | |
* @param - value - AST Value object with type `UnaryExpression` | |
* @returns - The extracted value converted to correct type. | |
*/ | |
export default function extractValueFromUnaryExpression(value) { | |
// eslint-disable-next-line global-require | |
const getValue = require('.').default; | |
const { operator, argument } = value; | |
switch (operator) { | |
case '-': | |
return -getValue(argument); | |
case '+': | |
return +getValue(argument); // eslint-disable-line no-implicit-coercion | |
case '!': | |
return !getValue(argument); | |
case '~': | |
return ~getValue(argument); // eslint-disable-line no-bitwise | |
case 'delete': | |
// I believe delete statements evaluate to true. | |
return true; | |
case 'typeof': | |
case 'void': | |
default: | |
return undefined; | |
} | |
} |