create project

kitabcitab/node_modules/eslint-module-utils/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));
+};