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22 lines
747 B
Plaintext
22 lines
747 B
Plaintext
"use strict"
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/**
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* Get the type of a node.
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* If TypeScript isn't present, returns `null`.
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*
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* @param {import('estree').Node} node - A node
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* @param {import('@typescript-eslint/parser').ParserServices} parserServices - A parserServices
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* @returns {import('typescript').Type | null}
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*/
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module.exports = function getTypeOfNode(node, parserServices) {
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const { esTreeNodeToTSNodeMap, program } = parserServices
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if (program === null) {
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return null
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}
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const tsNode = esTreeNodeToTSNodeMap.get(/** @type {any} */ (node))
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const checker = program.getTypeChecker()
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const nodeType = checker.getTypeAtLocation(tsNode)
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const constrained = checker.getBaseConstraintOfType(nodeType)
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return constrained ?? nodeType
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}
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