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unambiguous.js
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'use strict'; exports.__esModule = true; const pattern = /(^|;)\s*(export|import)((\s+\w)|(\s*[{*=]))|import\(/m; /** * detect possible imports/exports without a full parse. * * A negative test means that a file is definitely _not_ a module. * A positive test means it _could_ be. * * Not perfect, just a fast way to disqualify large non-ES6 modules and * avoid a parse. * @type {RegExp} */ exports.test = function isMaybeUnambiguousModule(content) { return pattern.test(content); }; // future-/Babel-proof at the expense of being a little loose const unambiguousNodeType = /^(?:(?:Exp|Imp)ort.*Declaration|TSExportAssignment)$/; /** * Given an AST, return true if the AST unambiguously represents a module. * @param {Program node} ast * @return {Boolean} */ exports.isModule = function isUnambiguousModule(ast) { return ast.body && ast.body.some(node => unambiguousNodeType.test(node.type)); };