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const fs = require("fs");
const path = require("path");
const assert = require("assert");
const resolveModule = require("./resolveModule");
const resolvePackageEntry = require("./resolvePackageEntry");
/**
* @typedef {object} ModuleExport
* @property {string} source
* @property {string} external
* @property {string} internal
*/
/**
* @param {string} source
* @returns {string}
*/
function makeRelativeSource(source) {
const chunks = source.split(path.sep);
return chunks.slice(chunks.lastIndexOf("node_modules") + 1).join("/");
}
/**
* @param {string} filename
* @param {import('@babel/core')} babel
* @returns {Generator<ModuleExport, void, any>}
*/
function* traverseDeep(filename, babel) {
const { types: t } = babel;
const content = fs.readFileSync(filename, "utf-8");
const ast = babel.parse(content, {
filename,
ast: true,
babelrc: false,
configFile: false,
sourceType: "module",
});
assert.ok(t.isFile(ast));
const dir = path.dirname(filename);
/** @type {Map<string, { name: string; source: string }>} */
const imports = new Map();
/** @type {Set<string>} */
const exportedNames = new Set();
/** @type {Set<string>} */
const reexportedModules = new Set();
for (const node of ast.program.body) {
if (t.isImportDeclaration(node)) {
const sourcePath = resolveModule(node.source.value, dir);
if (sourcePath) {
for (const specifier of node.specifiers) {
imports.set(specifier.local.name, {
source: makeRelativeSource(sourcePath),
name: t.isImportNamespaceSpecifier(specifier)
? "*"
: t.isImportDefaultSpecifier(specifier)
? "default"
: t.isIdentifier(specifier.imported)
? specifier.imported.name
: specifier.imported.value,
});
}
}
} else if (t.isExportNamedDeclaration(node)) {
if (t.isVariableDeclaration(node.declaration)) {
for (const declaration of node.declaration.declarations) {
if (
t.isIdentifier(declaration.id) &&
t.isIdentifier(declaration.init)
) {
const internal = declaration.init.name;
const imported = imports.get(internal);
if (imported) {
const external = declaration.id.name;
exportedNames.add(external);
yield {
external,
source: imported.source,
internal: imported.name,
};
}
}
}
}
const sourcePath = node.source && resolveModule(node.source.value, dir);
for (const specifier of node.specifiers) {
if (t.isExportSpecifier(specifier)) {
const internal = specifier.local.name;
const external = t.isIdentifier(specifier.exported)
? specifier.exported.name
: specifier.exported.value;
exportedNames.add(external);
if (sourcePath) {
yield {
internal,
external,
source: makeRelativeSource(sourcePath),
};
} else {
const imported = imports.get(internal);
if (imported) {
yield {
external,
source: imported.source,
internal: imported.name,
};
}
}
}
}
} else if (t.isExportAllDeclaration(node)) {
const sourcePath = resolveModule(node.source.value, dir);
assert.ok(
sourcePath,
`failed to resolve '${node.source.value}' from '${dir}'`
);
reexportedModules.add(sourcePath);
}
}
for (const reexportedModule of reexportedModules) {
// https://262.ecma-international.org/6.0/#sec-getexportednames
for (const entry of traverseDeep(reexportedModule, babel)) {
if (
// https://exploringjs.com/es6/leanpub-endnotes.html#fn-modules_2
entry.external !== "default" &&
!exportedNames.has(entry.external)
) {
yield entry;
}
}
}
}
/**
* @param {string} name
* @param {string | undefined} indexFile
* @param {import('@babel/core')} babel
* @returns {Map<string, ModuleExport>}
*/
module.exports = function getModuleExports(name, indexFile, babel) {
/** @type {Map<string, ModuleExport>} */
const exports = new Map();
const packageEntry = resolvePackageEntry(name, indexFile);
for (const entry of traverseDeep(packageEntry, babel)) {
exports.set(entry.external, entry);
}
return exports;
};
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