mirror of
https://github.com/react/react-native-devtools-frontend.git
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Tim van der Lippe
bc3a0b7a2b
R=jacktfranklin@chromium.org Bug: none Change-Id: I0ad7ba9133af3db19c448a284d79bdfc08101dea Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3268294 Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org> Auto-Submit: Tim van der Lippe <tvanderlippe@chromium.org> Reviewed-by: Jack Franklin <jacktfranklin@chromium.org>
30 lines
918 B
JavaScript
30 lines
918 B
JavaScript
'use strict';
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exports.__esModule = true;
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const pattern = /(^|;)\s*(export|import)((\s+\w)|(\s*[{*=]))|import\(/m;
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/**
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* detect possible imports/exports without a full parse.
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*
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* A negative test means that a file is definitely _not_ a module.
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* A positive test means it _could_ be.
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*
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* Not perfect, just a fast way to disqualify large non-ES6 modules and
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* avoid a parse.
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* @type {RegExp}
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*/
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exports.test = function isMaybeUnambiguousModule(content) {
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return pattern.test(content);
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};
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// future-/Babel-proof at the expense of being a little loose
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const unambiguousNodeType = /^(?:(?:Exp|Imp)ort.*Declaration|TSExportAssignment)$/;
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/**
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* Given an AST, return true if the AST unambiguously represents a module.
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* @param {Program node} ast
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* @return {Boolean}
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*/
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exports.isModule = function isUnambiguousModule(ast) {
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return ast.body && ast.body.some(node => unambiguousNodeType.test(node.type));
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};
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