49 lines
1.4 KiB
Plaintext
49 lines
1.4 KiB
Plaintext
/**
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* Library: isPromiseConstructor
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* Makes sure that an Expression node is new Promise().
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*/
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'use strict'
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/**
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* @typedef {import('estree').Node} Node
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* @typedef {import('estree').Expression} Expression
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* @typedef {import('estree').NewExpression} NewExpression
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* @typedef {import('estree').FunctionExpression} FunctionExpression
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* @typedef {import('estree').ArrowFunctionExpression} ArrowFunctionExpression
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*
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* @typedef {NewExpression & { callee: { type: 'Identifier', name: 'Promise' } }} NewPromise
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* @typedef {NewPromise & { arguments: [FunctionExpression | ArrowFunctionExpression] }} NewPromiseWithInlineExecutor
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*
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*/
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/**
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* Checks whether the given node is new Promise().
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* @param {Node} node
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* @returns {node is NewPromise}
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*/
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function isPromiseConstructor(node) {
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return (
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node.type === 'NewExpression' &&
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node.callee.type === 'Identifier' &&
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node.callee.name === 'Promise'
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)
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}
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/**
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* Checks whether the given node is new Promise(() => {}).
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* @param {Node} node
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* @returns {node is NewPromiseWithInlineExecutor}
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*/
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function isPromiseConstructorWithInlineExecutor(node) {
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return (
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isPromiseConstructor(node) &&
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node.arguments.length === 1 &&
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(node.arguments[0].type === 'FunctionExpression' ||
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node.arguments[0].type === 'ArrowFunctionExpression')
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)
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}
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module.exports = {
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isPromiseConstructor,
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isPromiseConstructorWithInlineExecutor,
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}
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