30 lines
918 B
JavaScript
30 lines
918 B
JavaScript
'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));
|
|
};
|