1 |
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2 | exports.__esModule = true
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3 |
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4 |
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5 | const pattern = /(^|;)\s*(export|import)((\s+\w)|(\s*[{*]))/m
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6 | /**
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7 | * detect possible imports/exports without a full parse.
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8 | *
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9 | * A negative test means that a file is definitely _not_ a module.
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10 | * A positive test means it _could_ be.
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11 | *
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12 | * Not perfect, just a fast way to disqualify large non-ES6 modules and
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13 | * avoid a parse.
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14 | * @type {RegExp}
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15 | */
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16 | exports.test = function isMaybeUnambiguousModule(content) {
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17 | return pattern.test(content)
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18 | }
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19 |
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20 | // future-/Babel-proof at the expense of being a little loose
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21 | const unambiguousNodeType = /^(Exp|Imp)ort.*Declaration$/
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22 |
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23 | /**
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24 | * Given an AST, return true if the AST unambiguously represents a module.
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25 | * @param {Program node} ast
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26 | * @return {Boolean}
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27 | */
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28 | exports.isModule = function isUnambiguousModule(ast) {
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29 | return ast.body.some(node => unambiguousNodeType.test(node.type))
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30 | }
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