| 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|TSExportAssignment)$/
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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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