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// original source: https://github.com/shimataro/babel-plugin-module-extension-resolver
// To create proper ES Modules, the paths imported need to be fully-specified,
// and can't be resolved like is possible with CommonJS. To have large compatibility
// without much hassle, we don't use extensions *inside* the source code, but add
// them with this plugin.
const fs = require('fs');
const path = require('path');
const PLUGIN_NAME = 'babel-plugin-extension-resolver';
module.exports = function extensionResolver(
{ types },
{
modulesToResolve = [],
srcExtensions = ['.js', '.ts', '.tsx'],
dstExtension = '.js',
}
) {
return {
name: PLUGIN_NAME,
visitor: {
Program: {
enter: (programPath, state) => {
const fileName = state.filename;
programPath.traverse(
{
ImportDeclaration(declaration) {
handleImportDeclaration({
types,
declaration,
fileName,
modulesToResolve,
srcExtensions,
dstExtension,
});
},
ExportDeclaration(declaration) {
handleExportDeclaration({
types,
declaration,
fileName,
modulesToResolve,
srcExtensions,
dstExtension,
});
},
},
state
);
},
},
},
};
};
function handleImportDeclaration({
types,
declaration,
fileName,
modulesToResolve,
srcExtensions,
dstExtension,
}) {
const source = declaration.get('source');
replaceSource({
types,
source,
fileName,
modulesToResolve,
srcExtensions,
dstExtension,
});
}
function handleExportDeclaration({
types,
declaration,
fileName,
modulesToResolve,
srcExtensions,
dstExtension,
}) {
const source = declaration.get('source');
if (Array.isArray(source)) {
return;
}
replaceSource({
types,
source,
fileName,
modulesToResolve,
srcExtensions,
dstExtension,
});
}
function replaceSource({
types,
source,
fileName,
modulesToResolve,
srcExtensions,
dstExtension,
}) {
if (!source.isStringLiteral()) {
return;
}
const sourcePath = source.node.value;
if (
modulesToResolve.every((prefix) => !sourcePath.startsWith(`${prefix}/`)) &&
!isRelativeDependency(sourcePath)
) {
return;
}
const baseDir = path.dirname(fileName);
let normalizedPath;
if (isRelativeDependency(sourcePath)) {
const resolvedPath = resolveRelativePath(
baseDir,
sourcePath,
srcExtensions,
dstExtension
);
normalizedPath = normalizeRelativePath(resolvedPath);
} else {
const resolvedPath = resolveAbsolutePath(sourcePath);
normalizedPath = normalizeAbsolutePath(resolvedPath);
}
source.replaceWith(types.stringLiteral(normalizedPath));
}
function resolveRelativePath(baseDir, sourcePath, srcExtensions, dstExtension) {
let resolvedPath = resolveRelativeExtension(
baseDir,
sourcePath,
srcExtensions,
dstExtension
);
if (resolvedPath === null) {
resolvedPath = resolveRelativeExtension(
baseDir,
path.join(sourcePath, 'index'),
srcExtensions,
dstExtension
);
}
if (resolvedPath === null) {
throw new Error(`import for "${sourcePath}" could not be resolved`);
}
return resolvedPath;
}
function resolveAbsolutePath(sourcePath) {
return require.resolve(sourcePath).split(['node_modules/'])[1];
}
function resolveRelativeExtension(
baseDir,
sourcePath,
srcExtensions,
dstExtension
) {
const absolutePath = path.join(baseDir, sourcePath);
if (isFile(absolutePath)) {
return sourcePath;
}
for (const extension of srcExtensions) {
if (isFile(`${absolutePath}${extension}`)) {
return path.relative(baseDir, `${absolutePath}${dstExtension}`);
}
}
return null;
}
function normalizeRelativePath(originalPath) {
let normalizedPath = originalPath;
if (path.sep === '\\') {
normalizedPath = normalizedPath.split(path.sep).join('/');
}
if (normalizedPath[0] !== '.') {
normalizedPath = `./${normalizedPath}`;
}
return normalizedPath;
}
function normalizeAbsolutePath(originalPath) {
let normalizedPath = originalPath;
if (path.sep === '\\') {
normalizedPath = normalizedPath.split(path.sep).join('/');
}
return normalizedPath;
}
function isFile(pathName) {
try {
return fs.statSync(pathName).isFile();
} catch (err) {
return false;
}
}
function isRelativeDependency(sourcePath) {
return sourcePath[0] === '.';
}
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